1 files changed, 145 insertions, 0 deletions
diff --git a/CryptoPkg/Library/BaseCryptLib/Hash/CryptSha256.c b/CryptoPkg/Library/BaseCryptLib/Hash/CryptSha256.c
new file mode 100644
index 0000000000..9b566a4c59
--- /dev/null
+++ b/CryptoPkg/Library/BaseCryptLib/Hash/CryptSha256.c
@@ -0,0 +1,145 @@
+/** @file
+  SHA-256 Digest Wrapper Implementation over OpenSSL.
+
+Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+
+#include <Library/BaseCryptLib.h>
+#include <openssl/sha.h>
+
+
+/**
+  Retrieves the size, in bytes, of the context buffer required for SHA-256 operations.
+
+  @return  The size, in bytes, of the context buffer required for SHA-256 operations.
+
+**/
+UINTN
+EFIAPI
+Sha256GetContextSize (
+  VOID
+  )
+{
+  //
+  // Retrieves OpenSSL SHA-256 Context Size
+  //
+  return (UINTN)(sizeof (SHA256_CTX));
+}
+
+
+/**
+  Initializes user-supplied memory pointed by Sha256Context as SHA-256 hash context for
+  subsequent use.
+
+  If Sha256Context is NULL, then ASSERT().
+
+  @param[in, out]  Sha256Context  Pointer to SHA-256 Context being initialized.
+
+  @retval TRUE   SHA-256 context initialization succeeded.
+  @retval FALSE  SHA-256 context initialization failed.
+
+**/
+BOOLEAN
+EFIAPI
+Sha256Init (
+  IN OUT  VOID  *Sha256Context
+  )
+{
+  //
+  // ASSERT if Sha256Context is NULL
+  //
+  ASSERT (Sha256Context != NULL);
+
+  //
+  // OpenSSL SHA-256 Context Initialization
+  //
+  return (BOOLEAN) (SHA256_Init ((SHA256_CTX *)Sha256Context));
+}
+
+
+/**
+  Performs SHA-256 digest on a data buffer of the specified length. This function can
+  be called multiple times to compute the digest of long or discontinuous data streams.
+
+  If Sha256Context is NULL, then ASSERT().
+
+  @param[in, out]  Sha256Context  Pointer to the SHA-256 context.
+  @param[in]       Data           Pointer to the buffer containing the data to be hashed.
+  @param[in]       DataLength     Length of Data buffer in bytes.
+
+  @retval TRUE   SHA-256 data digest succeeded.
+  @retval FALSE  Invalid SHA-256 context. After Sha256Final function has been called, the
+                 SHA-256 context cannot be reused.
+
+**/
+BOOLEAN
+EFIAPI
+Sha256Update (
+  IN OUT  VOID        *Sha256Context,
+  IN      CONST VOID  *Data,
+  IN      UINTN       DataLength
+  )
+{
+  //
+  // ASSERT if Sha256Context is NULL
+  //
+  ASSERT (Sha256Context != NULL);
+
+  //
+  // ASSERT if invalid parameters, in case that only DataLength was checked in OpenSSL
+  //
+  if (Data == NULL) {
+    ASSERT (DataLength == 0);
+  }
+
+  //
+  // OpenSSL SHA-256 Hash Update
+  //
+  return (BOOLEAN) (SHA256_Update ((SHA256_CTX *)Sha256Context, Data, DataLength));
+}
+
+
+/**
+  Completes SHA-256 hash computation and retrieves the digest value into the specified
+  memory. After this function has been called, the SHA-256 context cannot be used again.
+
+  If Sha256Context is NULL, then ASSERT().
+  If HashValue is NULL, then ASSERT().
+
+  @param[in, out]  Sha256Context  Pointer to SHA-256 context
+  @param[out]      HashValue      Pointer to a buffer that receives the SHA-256 digest
+                                  value (32 bytes).
+
+  @retval TRUE   SHA-256 digest computation succeeded.
+  @retval FALSE  SHA-256 digest computation failed.
+
+**/
+BOOLEAN
+EFIAPI
+Sha256Final (
+  IN OUT  VOID   *Sha256Context,
+  OUT     UINT8  *HashValue
+  )
+{
+  //
+  // ASSERT if Sha256Context is NULL or HashValue is NULL
+  //
+  ASSERT (Sha256Context != NULL);
+  ASSERT (HashValue     != NULL);
+
+  //
+  // OpenSSL SHA-256 Hash Finalization
+  //
+  return (BOOLEAN) (SHA256_Final (HashValue, (SHA256_CTX *)Sha256Context));
+}