[PATCH V6 04/13] CryptoPkg/BaseCryptLib: Retire ARC4 algorithm

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

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

ARC4 is not secure any longer.
Remove the ARC4 support from edk2.
Change the ARC4 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/Driver/Crypto.c                     |  95 +++-----
 CryptoPkg/Include/Library/BaseCryptLib.h      | 132 -----------
 .../Library/BaseCryptLib/BaseCryptLib.inf     |   1 -
 .../Library/BaseCryptLib/Cipher/CryptArc4.c   | 205 ------------------
 .../BaseCryptLib/Cipher/CryptArc4Null.c       | 124 -----------
 .../Library/BaseCryptLib/PeiCryptLib.inf      |   3 +-
 .../Library/BaseCryptLib/PeiCryptLib.uni      |   4 +-
 .../Library/BaseCryptLib/RuntimeCryptLib.inf  |   3 +-
 .../Library/BaseCryptLib/RuntimeCryptLib.uni  |   4 +-
 .../Library/BaseCryptLib/SmmCryptLib.inf      |   3 +-
 .../Library/BaseCryptLib/SmmCryptLib.uni      |   4 +-
 .../BaseCryptLibNull/BaseCryptLibNull.inf     |   1 -
 .../BaseCryptLibNull/Cipher/CryptArc4Null.c   | 124 -----------
 .../BaseCryptLibOnProtocolPpi/CryptLib.c      | 147 -------------
 CryptoPkg/Private/Protocol/Crypto.h           | 115 ++--------
 15 files changed, 48 insertions(+), 917 deletions(-)
 delete mode 100644 CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4.c
 delete mode 100644 CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4Null.c
 delete mode 100644 CryptoPkg/Library/BaseCryptLibNull/Cipher/CryptArc4Null.c

diff --git a/CryptoPkg/Driver/Crypto.c b/CryptoPkg/Driver/Crypto.c
index 53ee0edea5..af61482919 100644
--- a/CryptoPkg/Driver/Crypto.c
+++ b/CryptoPkg/Driver/Crypto.c
@@ -2037,150 +2037,107 @@ CryptoServiceAesCbcDecrypt (
 }
 
 /**
-  Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
-
-  If this interface is not supported, then return zero.
+  ARC4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
-  @return  The size, in bytes, of the context buffer required for ARC4 operations.
   @retval  0   This interface is not supported.
 
 **/
 UINTN
 EFIAPI
-CryptoServiceArc4GetContextSize (
+DeprecatedCryptoServiceArc4GetContextSize (
   VOID
   )
 {
-  return CALL_BASECRYPTLIB (Arc4.Services.GetContextSize, Arc4GetContextSize, (), 0);
+  return BaseCryptLibServiceDeprecated ("Arc4GetContextSize"), 0;
 }
 
 /**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
-  In addition, it sets up all ARC4 key materials for subsequent encryption and decryption
-  operations.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Key is NULL, then return FALSE.
-  If KeySize does not in the range of [5, 256] bytes, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  ARC4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
   @param[in]   Key          Pointer to the user-supplied ARC4 key.
   @param[in]   KeySize      Size of ARC4 key in bytes.
 
-  @retval TRUE   ARC4 context initialization succeeded.
-  @retval FALSE  ARC4 context initialization failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceArc4Init (
+DeprecatedCryptoServiceArc4Init (
   OUT  VOID         *Arc4Context,
   IN   CONST UINT8  *Key,
   IN   UINTN        KeySize
   )
 {
-  return CALL_BASECRYPTLIB (Arc4.Services.Init, Arc4Init, (Arc4Context, Key, KeySize), FALSE);
+  return BaseCryptLibServiceDeprecated ("Arc4Init"), FALSE;
 }
 
 /**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  This function performs ARC4 encryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  ARC4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in, out]  Arc4Context  Pointer to the ARC4 context.
   @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
   @param[in]       InputSize    Size of the Input buffer in bytes.
   @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
 
-  @retval TRUE   ARC4 encryption succeeded.
-  @retval FALSE  ARC4 encryption failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceArc4Encrypt (
+DeprecatedCryptoServiceArc4Encrypt (
   IN OUT  VOID         *Arc4Context,
   IN      CONST UINT8  *Input,
   IN      UINTN        InputSize,
   OUT     UINT8        *Output
   )
 {
-  return CALL_BASECRYPTLIB (Arc4.Services.Encrypt, Arc4Encrypt, (Arc4Context, Input, InputSize, Output), FALSE);
+  return BaseCryptLibServiceDeprecated ("Arc4Encrypt"), FALSE;
 }
 
 /**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  This function performs ARC4 decryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  ARC4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in, out]  Arc4Context  Pointer to the ARC4 context.
   @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
   @param[in]       InputSize    Size of the Input buffer in bytes.
   @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
 
-  @retval TRUE   ARC4 decryption succeeded.
-  @retval FALSE  ARC4 decryption failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceArc4Decrypt (
+DeprecatedCryptoServiceArc4Decrypt (
   IN OUT  VOID   *Arc4Context,
   IN      UINT8  *Input,
   IN      UINTN  InputSize,
   OUT     UINT8  *Output
   )
 {
-  return CALL_BASECRYPTLIB (Arc4.Services.Decrypt, Arc4Decrypt, (Arc4Context, Input, InputSize, Output), FALSE);
+  return BaseCryptLibServiceDeprecated ("Arc4Decrypt"), FALSE;
 }
 
 /**
-  Resets the ARC4 context to the initial state.
-
-  The function resets the ARC4 context to the state it had immediately after the
-  ARC4Init() function call.
-  Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
-  should be already correctly initialized by ARC4Init().
-
-  If Arc4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
+  ARC4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
   @param[in, out]  Arc4Context  Pointer to the ARC4 context.
 
-  @retval TRUE   ARC4 reset succeeded.
-  @retval FALSE  ARC4 reset failed.
   @retval FALSE  This interface is not supported.
 
 **/
 BOOLEAN
 EFIAPI
-CryptoServiceArc4Reset (
+DeprecatedCryptoServiceArc4Reset (
   IN OUT  VOID  *Arc4Context
   )
 {
-  return CALL_BASECRYPTLIB (Arc4.Services.Reset, Arc4Reset, (Arc4Context), FALSE);
+  return BaseCryptLibServiceDeprecated ("Arc4Reset"), FALSE;
 }
 
 //=====================================================================================
@@ -4502,12 +4459,12 @@ const EDKII_CRYPTO_PROTOCOL mEdkiiCrypto = {
   CryptoServiceAesEcbDecrypt,
   CryptoServiceAesCbcEncrypt,
   CryptoServiceAesCbcDecrypt,
-  /// Arc4
-  CryptoServiceArc4GetContextSize,
-  CryptoServiceArc4Init,
-  CryptoServiceArc4Encrypt,
-  CryptoServiceArc4Decrypt,
-  CryptoServiceArc4Reset,
+  /// Arc4 - deprecated and unsupported
+  DeprecatedCryptoServiceArc4GetContextSize,
+  DeprecatedCryptoServiceArc4Init,
+  DeprecatedCryptoServiceArc4Encrypt,
+  DeprecatedCryptoServiceArc4Decrypt,
+  DeprecatedCryptoServiceArc4Reset,
   /// SM3
   CryptoServiceSm3GetContextSize,
   CryptoServiceSm3Init,
diff --git a/CryptoPkg/Include/Library/BaseCryptLib.h b/CryptoPkg/Include/Library/BaseCryptLib.h
index c862f0334f..25e236c4a3 100644
--- a/CryptoPkg/Include/Library/BaseCryptLib.h
+++ b/CryptoPkg/Include/Library/BaseCryptLib.h
@@ -1667,138 +1667,6 @@ AesCbcDecrypt (
   OUT  UINT8        *Output
   );
 
-/**
-  Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
-
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for ARC4 operations.
-  @retval  0   This interface is not supported.
-
-**/
-UINTN
-EFIAPI
-Arc4GetContextSize (
-  VOID
-  );
-
-/**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
-  In addition, it sets up all ARC4 key materials for subsequent encryption and decryption
-  operations.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Key is NULL, then return FALSE.
-  If KeySize does not in the range of [5, 256] bytes, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
-  @param[in]   Key          Pointer to the user-supplied ARC4 key.
-  @param[in]   KeySize      Size of ARC4 key in bytes.
-
-  @retval TRUE   ARC4 context initialization succeeded.
-  @retval FALSE  ARC4 context initialization failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Init (
-  OUT  VOID         *Arc4Context,
-  IN   CONST UINT8  *Key,
-  IN   UINTN        KeySize
-  );
-
-/**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  This function performs ARC4 encryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
-
-  @retval TRUE   ARC4 encryption succeeded.
-  @retval FALSE  ARC4 encryption failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Encrypt (
-  IN OUT  VOID         *Arc4Context,
-  IN      CONST UINT8  *Input,
-  IN      UINTN        InputSize,
-  OUT     UINT8        *Output
-  );
-
-/**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  This function performs ARC4 decryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
-
-  @retval TRUE   ARC4 decryption succeeded.
-  @retval FALSE  ARC4 decryption failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Decrypt (
-  IN OUT  VOID   *Arc4Context,
-  IN      UINT8  *Input,
-  IN      UINTN  InputSize,
-  OUT     UINT8  *Output
-  );
-
-/**
-  Resets the ARC4 context to the initial state.
-
-  The function resets the ARC4 context to the state it had immediately after the
-  ARC4Init() function call.
-  Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
-  should be already correctly initialized by ARC4Init().
-
-  If Arc4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-
-  @retval TRUE   ARC4 reset succeeded.
-  @retval FALSE  ARC4 reset failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Reset (
-  IN OUT  VOID  *Arc4Context
-  );
-
 //=====================================================================================
 //    Asymmetric Cryptography Primitive
 //=====================================================================================
diff --git a/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf b/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
index 22992e7d43..da38ea552f 100644
--- a/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
@@ -40,7 +40,6 @@
   Kdf/CryptHkdf.c
   Cipher/CryptAes.c
   Cipher/CryptTdes.c
-  Cipher/CryptArc4.c
   Pk/CryptRsaBasic.c
   Pk/CryptRsaExt.c
   Pk/CryptPkcs1Oaep.c
diff --git a/CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4.c b/CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4.c
deleted file mode 100644
index 388d312bed..0000000000
--- a/CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4.c
+++ /dev/null
@@ -1,205 +0,0 @@
-/** @file
-  ARC4 Wrapper Implementation over OpenSSL.
-
-Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include "InternalCryptLib.h"
-#include <openssl/rc4.h>
-
-/**
-  Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
-
-  @return  The size, in bytes, of the context buffer required for ARC4 operations.
-
-**/
-UINTN
-EFIAPI
-Arc4GetContextSize (
-  VOID
-  )
-{
-  //
-  // Memory for 2 copies of RC4_KEY is allocated, one for working copy, and the other
-  // for backup copy. When Arc4Reset() is called, we can use the backup copy to restore
-  // the working copy to the initial state.
-  //
-  return (UINTN) (2 * sizeof (RC4_KEY));
-}
-
-/**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
-  In addition, it sets up all ARC4 key materials for subsequent encryption and decryption
-  operations.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Key is NULL, then return FALSE.
-  If KeySize does not in the range of [5, 256] bytes, then return FALSE.
-
-  @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
-  @param[in]   Key          Pointer to the user-supplied ARC4 key.
-  @param[in]   KeySize      Size of ARC4 key in bytes.
-
-  @retval TRUE   ARC4 context initialization succeeded.
-  @retval FALSE  ARC4 context initialization failed.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Init (
-  OUT  VOID         *Arc4Context,
-  IN   CONST UINT8  *Key,
-  IN   UINTN        KeySize
-  )
-{
-  RC4_KEY  *Rc4Key;
-
-  //
-  // Check input parameters.
-  //
-  if (Arc4Context == NULL || Key == NULL || (KeySize < 5 || KeySize > 256)) {
-    return FALSE;
-  }
-
-  Rc4Key = (RC4_KEY *) Arc4Context;
-
-  RC4_set_key (Rc4Key, (UINT32) KeySize, Key);
-
-  CopyMem (Rc4Key +  1, Rc4Key, sizeof (RC4_KEY));
-
-  return TRUE;
-}
-
-/**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  This function performs ARC4 encryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
-
-  @retval TRUE   ARC4 encryption succeeded.
-  @retval FALSE  ARC4 encryption failed.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Encrypt (
-  IN OUT  VOID         *Arc4Context,
-  IN      CONST UINT8  *Input,
-  IN      UINTN        InputSize,
-  OUT     UINT8        *Output
-  )
-{
-  RC4_KEY  *Rc4Key;
-
-  //
-  // Check input parameters.
-  //
-  if (Arc4Context == NULL || Input == NULL || Output == NULL || InputSize > INT_MAX) {
-    return FALSE;
-  }
-
-  Rc4Key = (RC4_KEY *) Arc4Context;
-
-  RC4 (Rc4Key, (UINT32) InputSize, Input, Output);
-
-  return TRUE;
-}
-
-/**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  This function performs ARC4 decryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
-
-  @retval TRUE   ARC4 decryption succeeded.
-  @retval FALSE  ARC4 decryption failed.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Decrypt (
-  IN OUT  VOID   *Arc4Context,
-  IN      UINT8  *Input,
-  IN      UINTN  InputSize,
-  OUT     UINT8  *Output
-  )
-{
-  RC4_KEY  *Rc4Key;
-
-  //
-  // Check input parameters.
-  //
-  if (Arc4Context == NULL || Input == NULL || Output == NULL || InputSize > INT_MAX) {
-    return FALSE;
-  }
-
-  Rc4Key = (RC4_KEY *) Arc4Context;
-
-  RC4 (Rc4Key, (UINT32) InputSize, Input, Output);
-
-  return TRUE;
-}
-
-/**
-  Resets the ARC4 context to the initial state.
-
-  The function resets the ARC4 context to the state it had immediately after the
-  ARC4Init() function call.
-  Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
-  should be already correctly initialized by ARC4Init().
-
-  If Arc4Context is NULL, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-
-  @retval TRUE   ARC4 reset succeeded.
-  @retval FALSE  ARC4 reset failed.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Reset (
-  IN OUT  VOID  *Arc4Context
-  )
-{
-  RC4_KEY  *Rc4Key;
-
-  //
-  // Check input parameters.
-  //
-  if (Arc4Context == NULL) {
-    return FALSE;
-  }
-
-  Rc4Key = (RC4_KEY *) Arc4Context;
-
-  CopyMem (Rc4Key, Rc4Key + 1, sizeof (RC4_KEY));
-
-  return TRUE;
-}
diff --git a/CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4Null.c b/CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4Null.c
deleted file mode 100644
index 1f09bfa30e..0000000000
--- a/CryptoPkg/Library/BaseCryptLib/Cipher/CryptArc4Null.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/** @file
-  ARC4 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 ARC4 operations.
-
-  Return zero to indicate this interface is not supported.
-
-  @retval  0   This interface is not supported.
-
-
-**/
-UINTN
-EFIAPI
-Arc4GetContextSize (
-  VOID
-  )
-{
-  ASSERT (FALSE);
-  return 0;
-}
-
-/**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
-  @param[in]   Key          Pointer to the user-supplied ARC4 key.
-  @param[in]   KeySize      Size of ARC4 key in bytes.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Init (
-  OUT  VOID         *Arc4Context,
-  IN   CONST UINT8  *Key,
-  IN   UINTN        KeySize
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Encrypt (
-  IN OUT  VOID         *Arc4Context,
-  IN      CONST UINT8  *Input,
-  IN      UINTN        InputSize,
-  OUT     UINT8        *Output
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Decrypt (
-  IN OUT  VOID   *Arc4Context,
-  IN      UINT8  *Input,
-  IN      UINTN  InputSize,
-  OUT     UINT8  *Output
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Resets the ARC4 context to the initial state.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Reset (
-  IN OUT  VOID  *Arc4Context
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
diff --git a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf
index e9add0127d..f43953b78c 100644
--- a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.inf
@@ -7,7 +7,7 @@
 #  buffer overflow or integer overflow.
 #
 #  Note:
-#  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES/ARC4 functions, RSA external
+#  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES 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
@@ -46,7 +46,6 @@
   Kdf/CryptHkdfNull.c
   Cipher/CryptAesNull.c
   Cipher/CryptTdesNull.c
-  Cipher/CryptArc4Null.c
   Pk/CryptRsaBasic.c
   Pk/CryptRsaExtNull.c
   Pk/CryptPkcs1OaepNull.c
diff --git a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni
index 374bfb3f65..5abd8e8dfb 100644
--- a/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni
+++ b/CryptoPkg/Library/BaseCryptLib/PeiCryptLib.uni
@@ -7,7 +7,7 @@
 // buffer overflow or integer overflow.
 //
 // Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/
-// TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions,
+// TDES 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.
@@ -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: 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 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 0a2eb03232..f1eb099b67 100644
--- a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf
@@ -7,7 +7,7 @@
 #  buffer overflow or integer overflow.
 #
 #  Note: SHA-384 Digest functions, SHA-512 Digest functions,
-#  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES/ARC4 functions, RSA external
+#  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES functions, RSA external
 #  functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and
 #  authenticode signature verification functions are not supported in this instance.
 #
@@ -46,7 +46,6 @@
   Kdf/CryptHkdfNull.c
   Cipher/CryptAesNull.c
   Cipher/CryptTdesNull.c
-  Cipher/CryptArc4Null.c
   Pk/CryptRsaBasic.c
   Pk/CryptRsaExtNull.c
   Pk/CryptPkcs1OaepNull.c
diff --git a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni
index b6d751176e..5a48d2a308 100644
--- a/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni
+++ b/CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.uni
@@ -7,7 +7,7 @@
 // buffer overflow or integer overflow.
 //
 // Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/
-// TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions,
+// TDES functions, RSA external functions, PKCS#7 SignedData sign functions,
 // Diffie-Hellman functions, and authenticode signature verification functions are
 // not supported in this instance.
 //
@@ -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: 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 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 139983075e..3a94655775 100644
--- a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.inf
+++ b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.inf
@@ -7,7 +7,7 @@
 #  buffer overflow or integer overflow.
 #
 #  Note: SHA-384 Digest functions, SHA-512 Digest functions,
-#  HMAC-MD5 functions, HMAC-SHA1 functions, TDES/ARC4 functions, RSA external
+#  HMAC-MD5 functions, HMAC-SHA1 functions, TDES functions, RSA external
 #  functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and
 #  authenticode signature verification functions are not supported in this instance.
 #
@@ -45,7 +45,6 @@
   Kdf/CryptHkdfNull.c
   Cipher/CryptAes.c
   Cipher/CryptTdesNull.c
-  Cipher/CryptArc4Null.c
   Pk/CryptRsaBasic.c
   Pk/CryptRsaExtNull.c
   Pk/CryptPkcs1Oaep.c
diff --git a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni
index b8d7953d2b..0561f107e8 100644
--- a/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni
+++ b/CryptoPkg/Library/BaseCryptLib/SmmCryptLib.uni
@@ -7,7 +7,7 @@
 // buffer overflow or integer overflow.
 //
 // Note: HMAC-MD5 functions, HMAC-SHA1 functions, AES/
-// TDES/ARC4 functions, RSA external functions, PKCS#7 SignedData sign functions,
+// TDES functions, RSA external functions, PKCS#7 SignedData sign functions,
 // Diffie-Hellman functions, and authenticode signature verification functions are
 // not supported in this instance.
 //
@@ -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: 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 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 b03681b146..a205c9005d 100644
--- a/CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf
+++ b/CryptoPkg/Library/BaseCryptLibNull/BaseCryptLibNull.inf
@@ -40,7 +40,6 @@
   Kdf/CryptHkdfNull.c
   Cipher/CryptAesNull.c
   Cipher/CryptTdesNull.c
-  Cipher/CryptArc4Null.c
   Pk/CryptRsaBasicNull.c
   Pk/CryptRsaExtNull.c
   Pk/CryptPkcs1OaepNull.c
diff --git a/CryptoPkg/Library/BaseCryptLibNull/Cipher/CryptArc4Null.c b/CryptoPkg/Library/BaseCryptLibNull/Cipher/CryptArc4Null.c
deleted file mode 100644
index 1f09bfa30e..0000000000
--- a/CryptoPkg/Library/BaseCryptLibNull/Cipher/CryptArc4Null.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/** @file
-  ARC4 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 ARC4 operations.
-
-  Return zero to indicate this interface is not supported.
-
-  @retval  0   This interface is not supported.
-
-
-**/
-UINTN
-EFIAPI
-Arc4GetContextSize (
-  VOID
-  )
-{
-  ASSERT (FALSE);
-  return 0;
-}
-
-/**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
-  @param[in]   Key          Pointer to the user-supplied ARC4 key.
-  @param[in]   KeySize      Size of ARC4 key in bytes.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Init (
-  OUT  VOID         *Arc4Context,
-  IN   CONST UINT8  *Key,
-  IN   UINTN        KeySize
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Encrypt (
-  IN OUT  VOID         *Arc4Context,
-  IN      CONST UINT8  *Input,
-  IN      UINTN        InputSize,
-  OUT     UINT8        *Output
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Decrypt (
-  IN OUT  VOID   *Arc4Context,
-  IN      UINT8  *Input,
-  IN      UINTN  InputSize,
-  OUT     UINT8  *Output
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
-
-/**
-  Resets the ARC4 context to the initial state.
-
-  Return FALSE to indicate this interface is not supported.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Reset (
-  IN OUT  VOID  *Arc4Context
-  )
-{
-  ASSERT (FALSE);
-  return FALSE;
-}
diff --git a/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c b/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c
index 5e470028f4..77915bdb86 100644
--- a/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c
+++ b/CryptoPkg/Library/BaseCryptLibOnProtocolPpi/CryptLib.c
@@ -1892,153 +1892,6 @@ AesCbcDecrypt (
   CALL_CRYPTO_SERVICE (AesCbcDecrypt, (AesContext, Input, InputSize, Ivec, Output), FALSE);
 }
 
-/**
-  Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
-
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for ARC4 operations.
-  @retval  0   This interface is not supported.
-
-**/
-UINTN
-EFIAPI
-Arc4GetContextSize (
-  VOID
-  )
-{
-  CALL_CRYPTO_SERVICE (Arc4GetContextSize, (), 0);
-}
-
-/**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
-  In addition, it sets up all ARC4 key materials for subsequent encryption and decryption
-  operations.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Key is NULL, then return FALSE.
-  If KeySize does not in the range of [5, 256] bytes, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
-  @param[in]   Key          Pointer to the user-supplied ARC4 key.
-  @param[in]   KeySize      Size of ARC4 key in bytes.
-
-  @retval TRUE   ARC4 context initialization succeeded.
-  @retval FALSE  ARC4 context initialization failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Init (
-  OUT  VOID         *Arc4Context,
-  IN   CONST UINT8  *Key,
-  IN   UINTN        KeySize
-  )
-{
-  CALL_CRYPTO_SERVICE (Arc4Init, (Arc4Context, Key, KeySize), FALSE);
-}
-
-/**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  This function performs ARC4 encryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
-
-  @retval TRUE   ARC4 encryption succeeded.
-  @retval FALSE  ARC4 encryption failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Encrypt (
-  IN OUT  VOID         *Arc4Context,
-  IN      CONST UINT8  *Input,
-  IN      UINTN        InputSize,
-  OUT     UINT8        *Output
-  )
-{
-  CALL_CRYPTO_SERVICE (Arc4Encrypt, (Arc4Context, Input, InputSize, Output), FALSE);
-}
-
-/**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  This function performs ARC4 decryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
-
-  @retval TRUE   ARC4 decryption succeeded.
-  @retval FALSE  ARC4 decryption failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Decrypt (
-  IN OUT  VOID   *Arc4Context,
-  IN      UINT8  *Input,
-  IN      UINTN  InputSize,
-  OUT     UINT8  *Output
-  )
-{
-  CALL_CRYPTO_SERVICE (Arc4Decrypt, (Arc4Context, Input, InputSize, Output), FALSE);
-}
-
-/**
-  Resets the ARC4 context to the initial state.
-
-  The function resets the ARC4 context to the state it had immediately after the
-  ARC4Init() function call.
-  Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
-  should be already correctly initialized by ARC4Init().
-
-  If Arc4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-
-  @retval TRUE   ARC4 reset succeeded.
-  @retval FALSE  ARC4 reset failed.
-  @retval FALSE  This interface is not supported.
-
-**/
-BOOLEAN
-EFIAPI
-Arc4Reset (
-  IN OUT  VOID  *Arc4Context
-  )
-{
-  CALL_CRYPTO_SERVICE (Arc4Reset, (Arc4Context), FALSE);
-}
-
 //=====================================================================================
 //    Asymmetric Cryptography Primitive
 //=====================================================================================
diff --git a/CryptoPkg/Private/Protocol/Crypto.h b/CryptoPkg/Private/Protocol/Crypto.h
index ae0f29695c..f36c5c1aff 100644
--- a/CryptoPkg/Private/Protocol/Crypto.h
+++ b/CryptoPkg/Private/Protocol/Crypto.h
@@ -2785,134 +2785,45 @@ BOOLEAN
   );
 
 /**
-  Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
-
-  If this interface is not supported, then return zero.
-
-  @return  The size, in bytes, of the context buffer required for ARC4 operations.
-  @retval  0   This interface is not supported.
+  ARC4 is deprecated and unsupported any longer.
+  Keep the function field for binary compability.
 
 **/
 typedef
 UINTN
-(EFIAPI *EDKII_CRYPTO_ARC4_GET_CONTEXT_SIZE) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_ARC4_GET_CONTEXT_SIZE) (
   VOID
   );
 
-/**
-  Initializes user-supplied memory as ARC4 context for subsequent use.
-
-  This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
-  In addition, it sets up all ARC4 key materials for subsequent encryption and decryption
-  operations.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Key is NULL, then return FALSE.
-  If KeySize does not in the range of [5, 256] bytes, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[out]  Arc4Context  Pointer to ARC4 context being initialized.
-  @param[in]   Key          Pointer to the user-supplied ARC4 key.
-  @param[in]   KeySize      Size of ARC4 key in bytes.
-
-  @retval TRUE   ARC4 context initialization succeeded.
-  @retval FALSE  ARC4 context initialization failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_ARC4_INIT) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_ARC4_INIT) (
   OUT  VOID         *Arc4Context,
   IN   CONST UINT8  *Key,
   IN   UINTN        KeySize
   );
 
-/**
-  Performs ARC4 encryption on a data buffer of the specified size.
-
-  This function performs ARC4 encryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be encrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 encryption output.
-
-  @retval TRUE   ARC4 encryption succeeded.
-  @retval FALSE  ARC4 encryption failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_ARC4_ENCRYPT) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_ARC4_ENCRYPT) (
   IN OUT  VOID         *Arc4Context,
   IN      CONST UINT8  *Input,
   IN      UINTN        InputSize,
   OUT     UINT8        *Output
   );
 
-/**
-  Performs ARC4 decryption on a data buffer of the specified size.
-
-  This function performs ARC4 decryption on data buffer pointed by Input, of specified
-  size of InputSize.
-  Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
-  invalid ARC4 context is undefined.
-
-  If Arc4Context is NULL, then return FALSE.
-  If Input is NULL, then return FALSE.
-  If Output is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-  @param[in]       Input        Pointer to the buffer containing the data to be decrypted.
-  @param[in]       InputSize    Size of the Input buffer in bytes.
-  @param[out]      Output       Pointer to a buffer that receives the ARC4 decryption output.
-
-  @retval TRUE   ARC4 decryption succeeded.
-  @retval FALSE  ARC4 decryption failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_ARC4_DECRYPT) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_ARC4_DECRYPT) (
   IN OUT  VOID   *Arc4Context,
   IN      UINT8  *Input,
   IN      UINTN  InputSize,
   OUT     UINT8  *Output
   );
 
-/**
-  Resets the ARC4 context to the initial state.
-
-  The function resets the ARC4 context to the state it had immediately after the
-  ARC4Init() function call.
-  Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
-  should be already correctly initialized by ARC4Init().
-
-  If Arc4Context is NULL, then return FALSE.
-  If this interface is not supported, then return FALSE.
-
-  @param[in, out]  Arc4Context  Pointer to the ARC4 context.
-
-  @retval TRUE   ARC4 reset succeeded.
-  @retval FALSE  ARC4 reset failed.
-  @retval FALSE  This interface is not supported.
-
-**/
 typedef
 BOOLEAN
-(EFIAPI *EDKII_CRYPTO_ARC4_RESET) (
+(EFIAPI *DEPRECATED_EDKII_CRYPTO_ARC4_RESET) (
   IN OUT  VOID  *Arc4Context
   );
 
@@ -4014,12 +3925,12 @@ struct _EDKII_CRYPTO_PROTOCOL {
   EDKII_CRYPTO_AES_ECB_DECRYPT                    AesEcbDecrypt;
   EDKII_CRYPTO_AES_CBC_ENCRYPT                    AesCbcEncrypt;
   EDKII_CRYPTO_AES_CBC_DECRYPT                    AesCbcDecrypt;
-  /// Arc4
-  EDKII_CRYPTO_ARC4_GET_CONTEXT_SIZE              Arc4GetContextSize;
-  EDKII_CRYPTO_ARC4_INIT                          Arc4Init;
-  EDKII_CRYPTO_ARC4_ENCRYPT                       Arc4Encrypt;
-  EDKII_CRYPTO_ARC4_DECRYPT                       Arc4Decrypt;
-  EDKII_CRYPTO_ARC4_RESET                         Arc4Reset;
+  /// Arc4 - deprecated and unsupported
+  DEPRECATED_EDKII_CRYPTO_ARC4_GET_CONTEXT_SIZE   DeprecatedArc4GetContextSize;
+  DEPRECATED_EDKII_CRYPTO_ARC4_INIT               DeprecatedArc4Init;
+  DEPRECATED_EDKII_CRYPTO_ARC4_ENCRYPT            DeprecatedArc4Encrypt;
+  DEPRECATED_EDKII_CRYPTO_ARC4_DECRYPT            DeprecatedArc4Decrypt;
+  DEPRECATED_EDKII_CRYPTO_ARC4_RESET              DeprecatedArc4Reset;
   /// SM3
   EDKII_CRYPTO_SM3_GET_CONTEXT_SIZE               Sm3GetContextSize;
   EDKII_CRYPTO_SM3_INIT                           Sm3Init;
-- 
2.21.0.windows.1