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/** @file
SHA-256 Digest Wrapper Implementation over OpenSSL.
Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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 initialized 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 initialized 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));
}
/**
Computes the SHA-256 message digest of a input data buffer.
This function performs the SHA-256 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 SHA-256 digest
value (32 bytes).
@retval TRUE SHA-256 digest computation succeeded.
@retval FALSE SHA-256 digest computation failed.
@retval FALSE This interface is not supported.
**/
BOOLEAN
EFIAPI
Sha256HashAll (
IN CONST VOID *Data,
IN UINTN DataSize,
OUT UINT8 *HashValue
)
{
SHA256_CTX Context;
//
// Check input parameters.
//
if (HashValue == NULL) {
return FALSE;
}
if ((Data == NULL) && (DataSize != 0)) {
return FALSE;
}
//
// OpenSSL SHA-256 Hash Computation.
//
if (!SHA256_Init (&Context)) {
return FALSE;
}
if (!SHA256_Update (&Context, Data, DataSize)) {
return FALSE;
}
if (!SHA256_Final (HashValue, &Context)) {
return FALSE;
}
return TRUE;
}
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