[PATCH V6 02/13] CryptoPkg/BaseCrpytLib: Retire MD4 algorithm

["Gao, Zhichao" <zhichao.gao@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1898

MD4 is not secure any longer.
Remove the MD4 support from edk2.
Change the MD4 field name in EDKII_CRYPTO_PROTOCOL to indicate the
function is unsupported any longer.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
---
 CryptoPkg/CryptoPkg.dsc                       |   1 -
 CryptoPkg/Driver/Crypto.c                     | 100 +++-----
 CryptoPkg/Include/Library/BaseCryptLib.h      | 145 ------------
 .../Library/BaseCryptLib/BaseCryptLib.inf     |   3 +-
 .../Library/BaseCryptLib/Hash/CryptMd4.c      | 223 ------------------
 .../Library/BaseCryptLib/Hash/CryptMd4Null.c  | 143 -----------
 .../Library/BaseCryptLib/PeiCryptLib.inf      |   5 +-
 .../Library/BaseCryptLib/PeiCryptLib.uni      |   6 +-
 .../Library/BaseCryptLib/RuntimeCryptLib.inf  |   5 +-
 .../Library/BaseCryptLib/RuntimeCryptLib.uni  |   6 +-
 .../Library/BaseCryptLib/SmmCryptLib.inf      |   5 +-
 .../Library/BaseCryptLib/SmmCryptLib.uni      |   6 +-
 .../BaseCryptLibNull/BaseCryptLibNull.inf     |   1 -
 .../BaseCryptLibNull/Hash/CryptMd4Null.c      | 143 -----------
 .../BaseCryptLibOnProtocolPpi/CryptLib.c      | 158 -------------
 CryptoPkg/Private/Protocol/Crypto.h           | 123 ++--------
 16 files changed, 62 insertions(+), 1011 deletions(-)
 delete mode 100644 CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4.c
 delete mode 100644 CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4Null.c
 delete mode 100644 CryptoPkg/Library/BaseCryptLibNull/Hash/CryptMd4Null.c

diff --git a/CryptoPkg/CryptoPkg.dsc b/CryptoPkg/CryptoPkg.dsc
index f79ff331cf..6ed7046563 100644
--- a/CryptoPkg/CryptoPkg.dsc
+++ b/CryptoPkg/CryptoPkg.dsc
@@ -140,7 +140,6 @@
   gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.HmacMd5.Family    | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
   gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.HmacSha1.Family   | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
   gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.HmacSha256.Family | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
-  gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.Md4.Family        | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
   gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.Md5.Family        | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
   gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.Pkcs.Family       | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
   gEfiCryptoPkgTokenSpaceGuid.PcdCryptoServiceFamilyEnable.Dh.Family         | PCD_CRYPTO_SERVICE_ENABLE_FAMILY
diff --git a/CryptoPkg/Driver/Crypto.c b/CryptoPkg/Driver/Crypto.c
index ed0083cccf..53ee0edea5 100644
--- a/CryptoPkg/Driver/Crypto.c
+++ b/CryptoPkg/Driver/Crypto.c
@@ -124,161 +124,123 @@ CryptoServiceGetCryptoVersion (
 //=====================================================================================
 
 /**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash operations.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for MD4 hash operations.
   @retval  0   This interface is not supported.
 
 **/
 UINTN
 EFIAPI
-CryptoServiceMd4GetContextSize (
+DeprecatedCryptoServiceMd4GetContextSize (
   VOID
   )
 {
-  return CALL_BASECRYPTLIB (Md4.Services.GetContextSize, Md4GetContextSize, (), 0);
+  return BaseCryptLibServiceDeprecated ("Md4GetContextSize"), 0;
 }
 
 /**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[out]  Md4Context  Pointer to MD4 context being initialized.
 
-  @retval TRUE   MD4 context initialization succeeded.
-  @retval FALSE  MD4 context initialization failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceMd4Init (
+DeprecatedCryptoServiceMd4Init (
   OUT  VOID  *Md4Context
   )
 {
-  return CALL_BASECRYPTLIB (Md4.Services.Init, Md4Init, (Md4Context), FALSE);
+  return BaseCryptLibServiceDeprecated ("Md4Init"), FALSE;
 }
 
 /**
-  Makes a copy of an existing MD4 context.
-
-  If Md4Context is NULL, then return FALSE.
-  If NewMd4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in]  Md4Context     Pointer to MD4 context being copied.
   @param[out] NewMd4Context  Pointer to new MD4 context.
 
-  @retval TRUE   MD4 context copy succeeded.
-  @retval FALSE  MD4 context copy failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceMd4Duplicate (
+DeprecatedCryptoServiceMd4Duplicate (
   IN   CONST VOID  *Md4Context,
   OUT  VOID        *NewMd4Context
   )
 {
-  return CALL_BASECRYPTLIB (Md4.Services.Duplicate, Md4Duplicate, (Md4Context, NewMd4Context), FALSE);
+  return BaseCryptLibServiceDeprecated ("Md4Duplicate"), FALSE;
 }
 
 /**
-  Digests the input data and updates MD4 context.
-
-  This function performs MD4 digest on a data buffer of the specified size.
-  It can be called multiple times to compute the digest of long or discontinuous data streams.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be finalized
-  by Md4Final(). Behavior with invalid context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in, out]  Md4Context  Pointer to the MD4 context.
   @param[in]       Data        Pointer to the buffer containing the data to be hashed.
   @param[in]       DataSize    Size of Data buffer in bytes.
 
-  @retval TRUE   MD4 data digest succeeded.
-  @retval FALSE  MD4 data digest failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceMd4Update (
+DeprecatedCryptoServiceMd4Update (
   IN OUT  VOID        *Md4Context,
   IN      CONST VOID  *Data,
   IN      UINTN       DataSize
   )
 {
-  return CALL_BASECRYPTLIB (Md4.Services.Update, Md4Update, (Md4Context, Data, DataSize), FALSE);
+  return BaseCryptLibServiceDeprecated ("Md4Update"), FALSE;
 }
 
 /**
-  Completes computation of the MD4 digest value.
-
-  This function completes MD4 hash computation and retrieves the digest value into
-  the specified memory. After this function has been called, the MD4 context cannot
-  be used again.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be
-  finalized by Md4Final(). Behavior with invalid MD4 context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If HashValue is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in, out]  Md4Context  Pointer to the MD4 context.
   @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
                                value (16 bytes).
 
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceMd4Final (
+DeprecatedCryptoServiceMd4Final (
   IN OUT  VOID   *Md4Context,
   OUT     UINT8  *HashValue
   )
 {
-  return CALL_BASECRYPTLIB (Md4.Services.Final, Md4Final, (Md4Context, HashValue), FALSE);
+  return BaseCryptLibServiceDeprecated ("Md4Final"), FALSE;
 }
 
 /**
-  Computes the MD4 message digest of a input data buffer.
-
-  This function performs the MD4 message digest of a given data buffer, and places
-  the digest value into the specified memory.
-
-  If this interface is not supported, then return FALSE.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in]   Data        Pointer to the buffer containing the data to be hashed.
   @param[in]   DataSize    Size of Data buffer in bytes.
   @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
                            value (16 bytes).
 
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceMd4HashAll (
+DeprecatedCryptoServiceMd4HashAll (
   IN   CONST VOID  *Data,
   IN   UINTN       DataSize,
   OUT  UINT8       *HashValue
   )
 {
-  return CALL_BASECRYPTLIB (Md4.Services.HashAll, Md4HashAll, (Data, DataSize, HashValue), FALSE);
+  return BaseCryptLibServiceDeprecated ("Md4HashAll"), FALSE;
 }
 
 /**
@@ -4440,13 +4402,13 @@ const EDKII_CRYPTO_PROTOCOL mEdkiiCrypto = {
   CryptoServiceHmacSha256Duplicate,
   CryptoServiceHmacSha256Update,
   CryptoServiceHmacSha256Final,
-  /// Md4
-  CryptoServiceMd4GetContextSize,
-  CryptoServiceMd4Init,
-  CryptoServiceMd4Duplicate,
-  CryptoServiceMd4Update,
-  CryptoServiceMd4Final,
-  CryptoServiceMd4HashAll,
+  /// Md4 - deprecated and unsupported
+  DeprecatedCryptoServiceMd4GetContextSize,
+  DeprecatedCryptoServiceMd4Init,
+  DeprecatedCryptoServiceMd4Duplicate,
+  DeprecatedCryptoServiceMd4Update,
+  DeprecatedCryptoServiceMd4Final,
+  DeprecatedCryptoServiceMd4HashAll,
   /// Md5
   CryptoServiceMd5GetContextSize,
   CryptoServiceMd5Init,
diff --git a/CryptoPkg/Include/Library/BaseCryptLib.h b/CryptoPkg/Include/Library/BaseCryptLib.h
index 5e8f2e0a10..c862f0334f 100644
--- a/CryptoPkg/Include/Library/BaseCryptLib.h
+++ b/CryptoPkg/Include/Library/BaseCryptLib.h
@@ -14,11 +14,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 #include <Uefi/UefiBaseType.h>
 
-///
-/// MD4 digest size in bytes
-///
-#define MD4_DIGEST_SIZE     16
-
 ///
 /// MD5 digest size in bytes
 ///
@@ -77,146 +72,6 @@ typedef enum {
 //    One-Way Cryptographic Hash Primitives
 //=====================================================================================
 
-/**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash operations.
-
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for MD4 hash operations.
-  @retval  0   This interface is not supported.
-
-**/
-UINTN
-EFIAPI
-Md4GetContextSize (
-  VOID
-  );
-
-/**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[out]  Md4Context  Pointer to MD4 context being initialized.
-
-  @retval TRUE   MD4 context initialization succeeded.
-  @retval FALSE  MD4 context initialization failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Init (
-  OUT  VOID  *Md4Context
-  );
-
-/**
-  Makes a copy of an existing MD4 context.
-
-  If Md4Context is NULL, then return FALSE.
-  If NewMd4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in]  Md4Context     Pointer to MD4 context being copied.
-  @param[out] NewMd4Context  Pointer to new MD4 context.
-
-  @retval TRUE   MD4 context copy succeeded.
-  @retval FALSE  MD4 context copy failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Duplicate (
-  IN   CONST VOID  *Md4Context,
-  OUT  VOID        *NewMd4Context
-  );
-
-/**
-  Digests the input data and updates MD4 context.
-
-  This function performs MD4 digest on a data buffer of the specified size.
-  It can be called multiple times to compute the digest of long or discontinuous data streams.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be finalized
-  by Md4Final(). Behavior with invalid context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[in]       Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]       DataSize    Size of Data buffer in bytes.
-
-  @retval TRUE   MD4 data digest succeeded.
-  @retval FALSE  MD4 data digest failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Update (
-  IN OUT  VOID        *Md4Context,
-  IN      CONST VOID  *Data,
-  IN      UINTN       DataSize
-  );
-
-/**
-  Completes computation of the MD4 digest value.
-
-  This function completes MD4 hash computation and retrieves the digest value into
-  the specified memory. After this function has been called, the MD4 context cannot
-  be used again.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be
-  finalized by Md4Final(). Behavior with invalid MD4 context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If HashValue is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
-                               value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Final (
-  IN OUT  VOID   *Md4Context,
-  OUT     UINT8  *HashValue
-  );
-
-/**
-  Computes the MD4 message digest of a input data buffer.
-
-  This function performs the MD4 message digest of a given data buffer, and places
-  the digest value into the specified memory.
-
-  If this interface is not supported, then return FALSE.
-
-  @param[in]   Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]   DataSize    Size of Data buffer in bytes.
-  @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
-                           value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4HashAll (
-  IN   CONST VOID  *Data,
-  IN   UINTN       DataSize,
-  OUT  UINT8       *HashValue
-  );
-
 /**
   Retrieves the size, in bytes, of the context buffer required for MD5 hash operations.
 
diff --git a/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf b/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
index a63ad66b4f..22992e7d43 100644
--- a/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
@@ -6,7 +6,7 @@
 #  This external input must be validated carefully to avoid security issues such as
 #  buffer overflow or integer overflow.
 #
-#  Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2009 - 2020, Intel Corporation. All rights reserved.<BR>
 #  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -29,7 +29,6 @@
 
 [Sources]
   InternalCryptLib.h
-  Hash/CryptMd4.c
   Hash/CryptMd5.c
   Hash/CryptSha1.c
   Hash/CryptSha256.c
diff --git a/CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4.c b/CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4.c
deleted file mode 100644
index bc02da07b0..0000000000
--- a/CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/** @file
-  MD4 Digest Wrapper Implementation over OpenSSL.
-
-Copyright (c) 2010 - 2016, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include "InternalCryptLib.h"
-#include <openssl/md4.h>
-
-/**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash operations.
-
-  @return  The size, in bytes, of the context buffer required for MD4 hash operations.
-
-**/
-UINTN
-EFIAPI
-Md4GetContextSize (
-  VOID
-  )
-{
-  //
-  // Retrieves the OpenSSL MD4 Context Size
-  //
-  return (UINTN) (sizeof (MD4_CTX));
-}
-
-/**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  If Md4Context is NULL, then return FALSE.
-
-  @param[out]  Md4Context  Pointer to MD4 context being initialized.
-
-  @retval TRUE   MD4 context initialization succeeded.
-  @retval FALSE  MD4 context initialization failed.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Init (
-  OUT  VOID  *Md4Context
-  )
-{
-  //
-  // Check input parameters.
-  //
-  if (Md4Context == NULL) {
-    return FALSE;
-  }
-
-  //
-  // OpenSSL MD4 Context Initialization
-  //
-  return (BOOLEAN) (MD4_Init ((MD4_CTX *) Md4Context));
-}
-
-/**
-  Makes a copy of an existing MD4 context.
-
-  If Md4Context is NULL, then return FALSE.
-  If NewMd4Context is NULL, then return FALSE.
-
-  @param[in]  Md4Context     Pointer to MD4 context being copied.
-  @param[out] NewMd4Context  Pointer to new MD4 context.
-
-  @retval TRUE   MD4 context copy succeeded.
-  @retval FALSE  MD4 context copy failed.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Duplicate (
-  IN   CONST VOID  *Md4Context,
-  OUT  VOID        *NewMd4Context
-  )
-{
-  //
-  // Check input parameters.
-  //
-  if (Md4Context == NULL || NewMd4Context == NULL) {
-    return FALSE;
-  }
-
-  CopyMem (NewMd4Context, Md4Context, sizeof (MD4_CTX));
-
-  return TRUE;
-}
-
-/**
-  Digests the input data and updates MD4 context.
-
-  This function performs MD4 digest on a data buffer of the specified size.
-  It can be called multiple times to compute the digest of long or discontinuous data streams.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be finalized
-  by Md4Final(). Behavior with invalid context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[in]       Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]       DataSize    Size of Data buffer in bytes.
-
-  @retval TRUE   MD4 data digest succeeded.
-  @retval FALSE  MD4 data digest failed.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Update (
-  IN OUT  VOID        *Md4Context,
-  IN      CONST VOID  *Data,
-  IN      UINTN       DataSize
-  )
-{
-  //
-  // Check input parameters.
-  //
-  if (Md4Context == NULL) {
-    return FALSE;
-  }
-
-  //
-  // Check invalid parameters, in case that only DataLength was checked in OpenSSL
-  //
-  if (Data == NULL && DataSize != 0) {
-    return FALSE;
-  }
-
-  //
-  // OpenSSL MD4 Hash Update
-  //
-  return (BOOLEAN) (MD4_Update ((MD4_CTX *) Md4Context, Data, DataSize));
-}
-
-/**
-  Completes computation of the MD4 digest value.
-
-  This function completes MD4 hash computation and retrieves the digest value into
-  the specified memory. After this function has been called, the MD4 context cannot
-  be used again.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be
-  finalized by Md4Final(). Behavior with invalid MD4 context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If HashValue is NULL, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
-                               value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Final (
-  IN OUT  VOID   *Md4Context,
-  OUT     UINT8  *HashValue
-  )
-{
-  //
-  // Check input parameters.
-  //
-  if (Md4Context == NULL || HashValue == NULL) {
-    return FALSE;
-  }
-
-  //
-  // OpenSSL MD4 Hash Finalization
-  //
-  return (BOOLEAN) (MD4_Final (HashValue, (MD4_CTX *) Md4Context));
-}
-
-/**
-  Computes the MD4 message digest of a input data buffer.
-
-  This function performs the MD4 message digest of a given data buffer, and places
-  the digest value into the specified memory.
-
-  If this interface is not supported, then return FALSE.
-
-  @param[in]   Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]   DataSize    Size of Data buffer in bytes.
-  @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
-                           value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4HashAll (
-  IN   CONST VOID  *Data,
-  IN   UINTN       DataSize,
-  OUT  UINT8       *HashValue
-  )
-{
-  //
-  // Check input parameters.
-  //
-  if (HashValue == NULL) {
-    return FALSE;
-  }
-  if (Data == NULL && DataSize != 0) {
-    return FALSE;
-  }
-
-  //
-  // OpenSSL MD4 Hash Computation.
-  //
-  if (MD4 (Data, DataSize, HashValue) == NULL) {
-    return FALSE;
-  } else {
-    return TRUE;
-  }
-}
diff --git a/CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4Null.c b/CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4Null.c
deleted file mode 100644
index 610c61c713..0000000000
--- a/CryptoPkg/Library/BaseCryptLib/Hash/CryptMd4Null.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/** @file
-  MD4 Digest Wrapper Implementation which does not provide real capabilities.
-
-Copyright (c) 2012 - 2018, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include "InternalCryptLib.h"
-
-/**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash
-  operations.
-
-  Return zero to indicate this interface is not supported.
-
-  @retval  0   This interface is not supported.
-
-**/
-UINTN
-EFIAPI
-Md4GetContextSize (
-  VOID
-  )
-{
-  ASSERT (FALSE);
-  return 0;
-}
-
-/**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[out]  Md4Context  Pointer to MD4 context being initialized.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Init (
-  OUT  VOID  *Md4Context
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Makes a copy of an existing MD4 context.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in]  Md4Context     Pointer to MD4 context being copied.
-  @param[out] NewMd4Context  Pointer to new MD4 context.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Duplicate (
-  IN   CONST VOID  *Md4Context,
-  OUT  VOID        *NewMd4Context
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Digests the input data and updates MD4 context.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[in]       Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]       DataSize    Size of Data buffer in bytes.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Update (
-  IN OUT  VOID        *Md4Context,
-  IN      CONST VOID  *Data,
-  IN      UINTN       DataSize
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Completes computation of the MD4 digest value.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
-                               value (16 bytes).
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Final (
-  IN OUT  VOID   *Md4Context,
-  OUT     UINT8  *HashValue
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Computes the MD4 message digest of a input data buffer.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in]   Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]   DataSize    Size of Data buffer in bytes.
-  @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
-                           value (16 bytes).
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4HashAll (
-  IN   CONST VOID  *Data,
-  IN   UINTN       DataSize,
-  OUT  UINT8       *HashValue
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
diff --git a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf
index c836c257f8..e9add0127d 100644
--- a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf
@@ -6,14 +6,14 @@
 #  This external input must be validated carefully to avoid security issues such as
 #  buffer overflow or integer overflow.
 #
-#  Note: MD4 Digest functions,
+#  Note:
 #  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES/ARC4 functions, RSA external
 #  functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, X.509
 #  certificate handler functions, authenticode signature verification functions,
 #  PEM handler functions, and pseudorandom number generator functions are not
 #  supported in this instance.
 #
-#  Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2010 - 2020, Intel Corporation. All rights reserved.<BR>
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 ##
@@ -35,7 +35,6 @@
 
 [Sources]
   InternalCryptLib.h
-  Hash/CryptMd4Null.c
   Hash/CryptMd5.c
   Hash/CryptSha1.c
   Hash/CryptSha256.c
diff --git a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni
index 9937555beb..374bfb3f65 100644
--- a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni
+++ b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni
@@ -6,13 +6,13 @@
 // This external input must be validated carefully to avoid security issues such as
 // buffer overflow or integer overflow.
 //
-// Note: MD4 Digest functions, HMAC-MD5 functions, HMAC-SHA1 functions, AES/
+// Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/
 // TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions,
 // Diffie-Hellman functions, X.509 certificate handler functions, authenticode
 // signature verification functions, PEM handler functions, and pseudorandom number
 // generator functions are not supported in this instance.
 //
-// Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
+// Copyright (c) 2010 - 2020, Intel Corporation. All rights reserved.<BR>
 //
 // SPDX-License-Identifier: BSD-2-Clause-Patent
 //
@@ -21,5 +21,5 @@
 
 #string STR_MODULE_ABSTRACT             #language en-US "Cryptographic Library Instance for PEIM"
 
-#string STR_MODULE_DESCRIPTION          #language en-US "Caution: This module requires additional review when modified. This library will have external input - signature. This external input must be validated carefully to avoid security issues such as buffer overflow or integer overflow. Note: MD4 Digest functions, HMAC-MD5 functions, HMAC-SHA1 functions, AES/ TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, X.509 certificate handler functions, authenticode signature verification functions, PEM handler functions, and pseudorandom number generator functions are not supported in this instance."
+#string STR_MODULE_DESCRIPTION          #language en-US "Caution: This module requires additional review when modified. This library will have external input - signature. This external input must be validated carefully to avoid security issues such as buffer overflow or integer overflow. Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/ TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, X.509 certificate handler functions, authenticode signature verification functions, PEM handler functions, and pseudorandom number generator functions are not supported in this instance."
 
diff --git a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf
index e5b8ececc1..0a2eb03232 100644
--- a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf
@@ -6,12 +6,12 @@
 #  This external input must be validated carefully to avoid security issues such as
 #  buffer overflow or integer overflow.
 #
-#  Note: MD4 Digest functions, SHA-384 Digest functions, SHA-512 Digest functions,
+#  Note: SHA-384 Digest functions, SHA-512 Digest functions,
 #  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES/ARC4 functions, RSA external
 #  functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and
 #  authenticode signature verification functions are not supported in this instance.
 #
-#  Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2009 - 2020, Intel Corporation. All rights reserved.<BR>
 #  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -35,7 +35,6 @@
 
 [Sources]
   InternalCryptLib.h
-  Hash/CryptMd4Null.c
   Hash/CryptMd5.c
   Hash/CryptSha1.c
   Hash/CryptSha256.c
diff --git a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni
index c0a16f1b84..b6d751176e 100644
--- a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni
+++ b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni
@@ -6,12 +6,12 @@
 // This external input must be validated carefully to avoid security issues such as
 // buffer overflow or integer overflow.
 //
-// Note: MD4 Digest functions, HMAC-MD5 functions, HMAC-SHA1 functions, AES/
+// Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/
 // TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions,
 // Diffie-Hellman functions, and authenticode signature verification functions are
 // not supported in this instance.
 //
-// Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+// Copyright (c) 2009 - 2020, Intel Corporation. All rights reserved.<BR>
 //
 // SPDX-License-Identifier: BSD-2-Clause-Patent
 //
@@ -20,5 +20,5 @@
 
 #string STR_MODULE_ABSTRACT             #language en-US "Cryptographic Library Instance for DXE_RUNTIME_DRIVER"
 
-#string STR_MODULE_DESCRIPTION          #language en-US "Caution: This module requires additional review when modified. This library will have external input - signature. This external input must be validated carefully to avoid security issues such as buffer overflow or integer overflow. Note: MD4 Digest functions, HMAC-MD5 functions, HMAC-SHA1 functions, AES/ TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and authenticode signature verification functions are not supported in this instance."
+#string STR_MODULE_DESCRIPTION          #language en-US "Caution: This module requires additional review when modified. This library will have external input - signature. This external input must be validated carefully to avoid security issues such as buffer overflow or integer overflow. Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/ TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and authenticode signature verification functions are not supported in this instance."
 
diff --git a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.inf b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.inf
index cc0b65fd25..139983075e 100644
--- a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.inf
@@ -6,12 +6,12 @@
 #  This external input must be validated carefully to avoid security issues such as
 #  buffer overflow or integer overflow.
 #
-#  Note: MD4 Digest functions, SHA-384 Digest functions, SHA-512 Digest functions,
+#  Note: SHA-384 Digest functions, SHA-512 Digest functions,
 #  HMAC-MD5 functions, HMAC-SHA1 functions, TDES/ARC4 functions, RSA external
 #  functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and
 #  authenticode signature verification functions are not supported in this instance.
 #
-#  Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2010 - 2020, Intel Corporation. All rights reserved.<BR>
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 ##
@@ -34,7 +34,6 @@
 
 [Sources]
   InternalCryptLib.h
-  Hash/CryptMd4Null.c
   Hash/CryptMd5.c
   Hash/CryptSha1.c
   Hash/CryptSha256.c
diff --git a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni
index 83485fbb90..b8d7953d2b 100644
--- a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni
+++ b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni
@@ -6,12 +6,12 @@
 // This external input must be validated carefully to avoid security issues such as
 // buffer overflow or integer overflow.
 //
-// Note: MD4 Digest functions, HMAC-MD5 functions, HMAC-SHA1 functions, AES/
+// Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/
 // TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions,
 // Diffie-Hellman functions, and authenticode signature verification functions are
 // not supported in this instance.
 //
-// Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
+// Copyright (c) 2010 - 2020, Intel Corporation. All rights reserved.<BR>
 //
 // SPDX-License-Identifier: BSD-2-Clause-Patent
 //
@@ -20,5 +20,5 @@
 
 #string STR_MODULE_ABSTRACT             #language en-US "Cryptographic Library Instance for SMM driver"
 
-#string STR_MODULE_DESCRIPTION          #language en-US "Caution: This module requires additional review when modified. This library will have external input - signature. This external input must be validated carefully to avoid security issues such as buffer overflow or integer overflow. Note: MD4 Digest functions, HMAC-MD5 functions, HMAC-SHA1 functions, AES/ TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and authenticode signature verification functions are not supported in this instance."
+#string STR_MODULE_DESCRIPTION          #language en-US "Caution: This module requires additional review when modified. This library will have external input - signature. This external input must be validated carefully to avoid security issues such as buffer overflow or integer overflow. Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/ TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and authenticode signature verification functions are not supported in this instance."
 
diff --git a/CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf b/CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf
index 9b4991cbb0..b03681b146 100644
--- a/CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf
+++ b/CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf
@@ -29,7 +29,6 @@
 
 [Sources]
   InternalCryptLib.h
-  Hash/CryptMd4Null.c
   Hash/CryptMd5Null.c
   Hash/CryptSha1Null.c
   Hash/CryptSha256Null.c
diff --git a/CryptoPkg/Library/BaseCryptLibNull/Hash/CryptMd4Null.c b/CryptoPkg/Library/BaseCryptLibNull/Hash/CryptMd4Null.c
deleted file mode 100644
index 610c61c713..0000000000
--- a/CryptoPkg/Library/BaseCryptLibNull/Hash/CryptMd4Null.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/** @file
-  MD4 Digest Wrapper Implementation which does not provide real capabilities.
-
-Copyright (c) 2012 - 2018, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include "InternalCryptLib.h"
-
-/**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash
-  operations.
-
-  Return zero to indicate this interface is not supported.
-
-  @retval  0   This interface is not supported.
-
-**/
-UINTN
-EFIAPI
-Md4GetContextSize (
-  VOID
-  )
-{
-  ASSERT (FALSE);
-  return 0;
-}
-
-/**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[out]  Md4Context  Pointer to MD4 context being initialized.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Init (
-  OUT  VOID  *Md4Context
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Makes a copy of an existing MD4 context.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in]  Md4Context     Pointer to MD4 context being copied.
-  @param[out] NewMd4Context  Pointer to new MD4 context.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Duplicate (
-  IN   CONST VOID  *Md4Context,
-  OUT  VOID        *NewMd4Context
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Digests the input data and updates MD4 context.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[in]       Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]       DataSize    Size of Data buffer in bytes.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Update (
-  IN OUT  VOID        *Md4Context,
-  IN      CONST VOID  *Data,
-  IN      UINTN       DataSize
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Completes computation of the MD4 digest value.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
-                               value (16 bytes).
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Final (
-  IN OUT  VOID   *Md4Context,
-  OUT     UINT8  *HashValue
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Computes the MD4 message digest of a input data buffer.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in]   Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]   DataSize    Size of Data buffer in bytes.
-  @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
-                           value (16 bytes).
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4HashAll (
-  IN   CONST VOID  *Data,
-  IN   UINTN       DataSize,
-  OUT  UINT8       *HashValue
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
diff --git a/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c b/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c
index c2a1df9afc..5e470028f4 100644
--- a/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c
+++ b/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c
@@ -99,164 +99,6 @@ CryptoServiceNotAvailable (
 //    One-Way Cryptographic Hash Primitives
 //=====================================================================================
 
-/**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash operations.
-
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for MD4 hash operations.
-  @retval  0   This interface is not supported.
-
-**/
-UINTN
-EFIAPI
-Md4GetContextSize (
-  VOID
-  )
-{
-  CALL_CRYPTO_SERVICE (Md4GetContextSize, (), 0);
-}
-
-/**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[out]  Md4Context  Pointer to MD4 context being initialized.
-
-  @retval TRUE   MD4 context initialization succeeded.
-  @retval FALSE  MD4 context initialization failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Init (
-  OUT  VOID  *Md4Context
-  )
-{
-  CALL_CRYPTO_SERVICE (Md4Init, (Md4Context), FALSE);
-}
-
-/**
-  Makes a copy of an existing MD4 context.
-
-  If Md4Context is NULL, then return FALSE.
-  If NewMd4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in]  Md4Context     Pointer to MD4 context being copied.
-  @param[out] NewMd4Context  Pointer to new MD4 context.
-
-  @retval TRUE   MD4 context copy succeeded.
-  @retval FALSE  MD4 context copy failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Duplicate (
-  IN   CONST VOID  *Md4Context,
-  OUT  VOID        *NewMd4Context
-  )
-{
-  CALL_CRYPTO_SERVICE (Md4Duplicate, (Md4Context, NewMd4Context), FALSE);
-}
-
-/**
-  Digests the input data and updates MD4 context.
-
-  This function performs MD4 digest on a data buffer of the specified size.
-  It can be called multiple times to compute the digest of long or discontinuous data streams.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be finalized
-  by Md4Final(). Behavior with invalid context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[in]       Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]       DataSize    Size of Data buffer in bytes.
-
-  @retval TRUE   MD4 data digest succeeded.
-  @retval FALSE  MD4 data digest failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Update (
-  IN OUT  VOID        *Md4Context,
-  IN      CONST VOID  *Data,
-  IN      UINTN       DataSize
-  )
-{
-  CALL_CRYPTO_SERVICE (Md4Update, (Md4Context, Data, DataSize), FALSE);
-}
-
-/**
-  Completes computation of the MD4 digest value.
-
-  This function completes MD4 hash computation and retrieves the digest value into
-  the specified memory. After this function has been called, the MD4 context cannot
-  be used again.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be
-  finalized by Md4Final(). Behavior with invalid MD4 context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If HashValue is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
-                               value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4Final (
-  IN OUT  VOID   *Md4Context,
-  OUT     UINT8  *HashValue
-  )
-{
-  CALL_CRYPTO_SERVICE (Md4Final, (Md4Context, HashValue), FALSE);
-}
-
-/**
-  Computes the MD4 message digest of a input data buffer.
-
-  This function performs the MD4 message digest of a given data buffer, and places
-  the digest value into the specified memory.
-
-  If this interface is not supported, then return FALSE.
-
-  @param[in]   Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]   DataSize    Size of Data buffer in bytes.
-  @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
-                           value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Md4HashAll (
-  IN   CONST VOID  *Data,
-  IN   UINTN       DataSize,
-  OUT  UINT8       *HashValue
-  )
-{
-  CALL_CRYPTO_SERVICE (Md4HashAll, (Data, DataSize, HashValue), FALSE);
-}
-
 /**
   Retrieves the size, in bytes, of the context buffer required for MD5 hash operations.
 
diff --git a/CryptoPkg/Private/Protocol/Crypto.h b/CryptoPkg/Private/Protocol/Crypto.h
index 40c387e002..ae0f29695c 100644
--- a/CryptoPkg/Private/Protocol/Crypto.h
+++ b/CryptoPkg/Private/Protocol/Crypto.h
@@ -451,145 +451,52 @@ BOOLEAN
 //=====================================================================================
 
 /**
-  Retrieves the size, in bytes, of the context buffer required for MD4 hash operations.
-
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for MD4 hash operations.
-  @retval  0   This interface is not supported.
+  MD4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
 **/
 typedef
 UINTN
-(EFIAPI *EDKII_CRYPTO_MD4_GET_CONTEXT_SIZE) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_MD4_GET_CONTEXT_SIZE) (
   VOID
   );
 
 
-/**
-  Initializes user-supplied memory pointed by Md4Context as MD4 hash context for
-  subsequent use.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[out]  Md4Context  Pointer to MD4 context being initialized.
-
-  @retval TRUE   MD4 context initialization succeeded.
-  @retval FALSE  MD4 context initialization failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_MD4_INIT) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_MD4_INIT) (
   OUT  VOID  *Md4Context
   );
 
 
-/**
-  Makes a copy of an existing MD4 context.
-
-  If Md4Context is NULL, then return FALSE.
-  If NewMd4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in]  Md4Context     Pointer to MD4 context being copied.
-  @param[out] NewMd4Context  Pointer to new MD4 context.
-
-  @retval TRUE   MD4 context copy succeeded.
-  @retval FALSE  MD4 context copy failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_MD4_DUPLICATE) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_MD4_DUPLICATE) (
   IN   CONST VOID  *Md4Context,
   OUT  VOID        *NewMd4Context
   );
 
 
-/**
-  Digests the input data and updates MD4 context.
-
-  This function performs MD4 digest on a data buffer of the specified size.
-  It can be called multiple times to compute the digest of long or discontinuous data streams.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be finalized
-  by Md4Final(). Behavior with invalid context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[in]       Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]       DataSize    Size of Data buffer in bytes.
-
-  @retval TRUE   MD4 data digest succeeded.
-  @retval FALSE  MD4 data digest failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_MD4_UPDATE) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_MD4_UPDATE) (
   IN OUT  VOID        *Md4Context,
   IN      CONST VOID  *Data,
   IN      UINTN       DataSize
   );
 
 
-/**
-  Completes computation of the MD4 digest value.
-
-  This function completes MD4 hash computation and retrieves the digest value into
-  the specified memory. After this function has been called, the MD4 context cannot
-  be used again.
-  MD4 context should be already correctly initialized by Md4Init(), and should not be
-  finalized by Md4Final(). Behavior with invalid MD4 context is undefined.
-
-  If Md4Context is NULL, then return FALSE.
-  If HashValue is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Md4Context  Pointer to the MD4 context.
-  @param[out]      HashValue   Pointer to a buffer that receives the MD4 digest
-                               value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_MD4_FINAL) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_MD4_FINAL) (
   IN OUT  VOID   *Md4Context,
   OUT     UINT8  *HashValue
   );
 
 
-/**
-  Computes the MD4 message digest of a input data buffer.
-
-  This function performs the MD4 message digest of a given data buffer, and places
-  the digest value into the specified memory.
-
-  If this interface is not supported, then return FALSE.
-
-  @param[in]   Data        Pointer to the buffer containing the data to be hashed.
-  @param[in]   DataSize    Size of Data buffer in bytes.
-  @param[out]  HashValue   Pointer to a buffer that receives the MD4 digest
-                           value (16 bytes).
-
-  @retval TRUE   MD4 digest computation succeeded.
-  @retval FALSE  MD4 digest computation failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_MD4_HASH_ALL) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_MD4_HASH_ALL) (
   IN   CONST VOID  *Data,
   IN   UINTN       DataSize,
   OUT  UINT8       *HashValue
@@ -4007,13 +3914,13 @@ struct _EDKII_CRYPTO_PROTOCOL {
   EDKII_CRYPTO_HMAC_SHA256_DUPLICATE              HmacSha256Duplicate;
   EDKII_CRYPTO_HMAC_SHA256_UPDATE                 HmacSha256Update;
   EDKII_CRYPTO_HMAC_SHA256_FINAL                  HmacSha256Final;
-  /// Md4
-  EDKII_CRYPTO_MD4_GET_CONTEXT_SIZE               Md4GetContextSize;
-  EDKII_CRYPTO_MD4_INIT                           Md4Init;
-  EDKII_CRYPTO_MD4_DUPLICATE                      Md4Duplicate;
-  EDKII_CRYPTO_MD4_UPDATE                         Md4Update;
-  EDKII_CRYPTO_MD4_FINAL                          Md4Final;
-  EDKII_CRYPTO_MD4_HASH_ALL                       Md4HashAll;
+  /// Md4 - deprecated and unsupported
+  DEPRECATED_EDKII_CRYPTO_MD4_GET_CONTEXT_SIZE    DeprecatedMd4GetContextSize;
+  DEPRECATED_EDKII_CRYPTO_MD4_INIT                DeprecatedMd4Init;
+  DEPRECATED_EDKII_CRYPTO_MD4_DUPLICATE           DeprecatedMd4Duplicate;
+  DEPRECATED_EDKII_CRYPTO_MD4_UPDATE              DeprecatedMd4Update;
+  DEPRECATED_EDKII_CRYPTO_MD4_FINAL               DeprecatedMd4Final;
+  DEPRECATED_EDKII_CRYPTO_MD4_HASH_ALL            DeprecatedMd4HashAll;
   /// Md5
   EDKII_CRYPTO_MD5_GET_CONTEXT_SIZE               Md5GetContextSize;
   EDKII_CRYPTO_MD5_INIT                           Md5Init;
-- 
2.21.0.windows.1