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/** @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 "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 ASSERT().
@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
)
{
//
// ASSERT if Sha256Context is NULL
//
ASSERT (Sha256Context != NULL);
//
// 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 ASSERT().
If NewSha256Context is NULL, then ASSERT().
@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
)
{
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 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] 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
)
{
//
// 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 (DataSize == 0);
}
//
// 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 ASSERT().
If HashValue is NULL, then ASSERT().
@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
)
{
//
// 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));
}
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