From 3e5756512efd00beca8e76ea70d5924056aa4714 Mon Sep 17 00:00:00 2001
From: Steve Langasek <steve.langasek@ubuntu.com>
Date: Wed, 29 Aug 2012 16:51:10 -0700
Subject: Import upstream version 0~20120728.3df9e294

---
 Cryptlib/Hash/CryptSha256.c | 183 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 Cryptlib/Hash/CryptSha256.c

(limited to 'Cryptlib/Hash/CryptSha256.c')

diff --git a/Cryptlib/Hash/CryptSha256.c b/Cryptlib/Hash/CryptSha256.c
new file mode 100644
index 00000000..ca0cb1aa
--- /dev/null
+++ b/Cryptlib/Hash/CryptSha256.c
@@ -0,0 +1,183 @@
+/** @file
+  SHA-256 Digest Wrapper Implementation over OpenSSL.
+
+Copyright (c) 2009 - 2012, 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 "InternalCryptLib.h"
+#include <openssl/sha.h>
+
+/**
+  Retrieves the size, in bytes, of the context buffer required for SHA-256 hash operations.
+
+  @return  The size, in bytes, of the context buffer required for SHA-256 hash 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 return FALSE.
+
+  @param[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 (
+  OUT  VOID  *Sha256Context
+  )
+{
+  //
+  // Check input parameters.
+  //
+  if (Sha256Context == NULL) {
+    return FALSE;
+  }
+
+  //
+  // OpenSSL SHA-256 Context Initialization
+  //
+  return (BOOLEAN) (SHA256_Init ((SHA256_CTX *)Sha256Context));
+}
+
+/**
+  Makes a copy of an existing SHA-256 context.
+
+  If Sha256Context is NULL, then return FALSE.
+  If NewSha256Context is NULL, then return FALSE.
+
+  @param[in]  Sha256Context     Pointer to SHA-256 context being copied.
+  @param[out] NewSha256Context  Pointer to new SHA-256 context.
+
+  @retval TRUE   SHA-256 context copy succeeded.
+  @retval FALSE  SHA-256 context copy failed.
+
+**/
+BOOLEAN
+EFIAPI
+Sha256Duplicate (
+  IN   CONST VOID  *Sha256Context,
+  OUT  VOID        *NewSha256Context
+  )
+{
+  //
+  // Check input parameters.
+  //
+  if (Sha256Context == NULL || NewSha256Context == NULL) {
+    return FALSE;
+  }
+
+  CopyMem (NewSha256Context, Sha256Context, sizeof (SHA256_CTX));
+
+  return TRUE;
+}
+
+/**
+  Digests the input data and updates SHA-256 context.
+
+  This function performs SHA-256 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.
+  SHA-256 context should be already correctly intialized by Sha256Init(), and should not be finalized
+  by Sha256Final(). Behavior with invalid context is undefined.
+
+  If Sha256Context is NULL, then return FALSE.
+
+  @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]       DataSize       Size of Data buffer in bytes.
+
+  @retval TRUE   SHA-256 data digest succeeded.
+  @retval FALSE  SHA-256 data digest failed.
+
+**/
+BOOLEAN
+EFIAPI
+Sha256Update (
+  IN OUT  VOID        *Sha256Context,
+  IN      CONST VOID  *Data,
+  IN      UINTN       DataSize
+  )
+{
+  //
+  // Check input parameters.
+  //
+  if (Sha256Context == NULL) {
+    return FALSE;
+  }
+
+  //
+  // Check invalid parameters, in case that only DataLength was checked in OpenSSL
+  //
+  if (Data == NULL && DataSize != 0) {
+    return FALSE;
+  }
+
+  //
+  // OpenSSL SHA-256 Hash Update
+  //
+  return (BOOLEAN) (SHA256_Update ((SHA256_CTX *)Sha256Context, Data, DataSize));
+}
+
+/**
+  Completes computation of the SHA-256 digest value.
+
+  This function 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.
+  SHA-256 context should be already correctly intialized by Sha256Init(), and should not be
+  finalized by Sha256Final(). Behavior with invalid SHA-256 context is undefined.
+
+  If Sha256Context is NULL, then return FALSE.
+  If HashValue is NULL, then return FALSE.
+
+  @param[in, out]  Sha256Context  Pointer to the 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
+  )
+{
+  //
+  // Check input parameters.
+  //
+  if (Sha256Context == NULL || HashValue == NULL) {
+    return FALSE;
+  }
+
+  //
+  // OpenSSL SHA-256 Hash Finalization
+  //
+  return (BOOLEAN) (SHA256_Final (HashValue, (SHA256_CTX *)Sha256Context));
+}
-- 
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