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/** @file
HMAC-SHA1 Wrapper Implementation over OpenSSL.
Copyright (c) 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/hmac.h>
/**
Retrieves the size, in bytes, of the context buffer required for HMAC-SHA1 operations.
@return The size, in bytes, of the context buffer required for HMAC-SHA1 operations.
**/
UINTN
EFIAPI
HmacSha1GetContextSize (
VOID
)
{
//
// Retrieves the OpenSSL HMAC-SHA1 Context Size
//
return (UINTN)(sizeof (HMAC_CTX));
}
/**
Initializes user-supplied memory pointed by HmacSha1Context as HMAC-SHA1 context for
subsequent use.
If HmacSha1Context is NULL, then ASSERT().
@param[out] HmacSha1Context Pointer to HMAC-SHA1 context being initialized.
@param[in] Key Pointer to the user-supplied key.
@param[in] KeySize Key size in bytes.
@retval TRUE HMAC-SHA1 context initialization succeeded.
@retval FALSE HMAC-SHA1 context initialization failed.
**/
BOOLEAN
EFIAPI
HmacSha1Init (
OUT VOID *HmacSha1Context,
IN CONST UINT8 *Key,
IN UINTN KeySize
)
{
//
// ASSERT if HmacSha1Context is NULL.
//
ASSERT (HmacSha1Context != NULL);
//
// OpenSSL HMAC-SHA1 Context Initialization
//
HMAC_CTX_init (HmacSha1Context);
HMAC_Init_ex (HmacSha1Context, Key, (UINT32) KeySize, EVP_sha1(), NULL);
return TRUE;
}
/**
Makes a copy of an existing HMAC-SHA1 context.
If HmacSha1Context is NULL, then ASSERT().
If NewHmacSha1Context is NULL, then ASSERT().
@param[in] HmacSha1Context Pointer to HMAC-SHA1 context being copied.
@param[out] NewHmacSha1Context Pointer to new HMAC-SHA1 context.
@retval TRUE HMAC-SHA1 context copy succeeded.
@retval FALSE HMAC-SHA1 context copy failed.
**/
BOOLEAN
EFIAPI
HmacSha1Duplicate (
IN CONST VOID *HmacSha1Context,
OUT VOID *NewHmacSha1Context
)
{
//
// ASSERT if HmacSha1Context or NewHmacSha1Context is NULL.
//
ASSERT (HmacSha1Context != NULL);
ASSERT (NewHmacSha1Context != NULL);
CopyMem (NewHmacSha1Context, HmacSha1Context, sizeof (HMAC_CTX));
return TRUE;
}
/**
Digests the input data and updates HMAC-SHA1 context.
This function performs HMAC-SHA1 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.
HMAC-SHA1 context should be already correctly intialized by HmacSha1Init(), and should not
be finalized by HmacSha1Final(). Behavior with invalid context is undefined.
If HmacSha1Context is NULL, then ASSERT().
@param[in, out] HmacSha1Context Pointer to the HMAC-SHA1 context.
@param[in] Data Pointer to the buffer containing the data to be digested.
@param[in] DataSize Size of Data buffer in bytes.
@retval TRUE HMAC-SHA1 data digest succeeded.
@retval FALSE HMAC-SHA1 data digest failed.
**/
BOOLEAN
EFIAPI
HmacSha1Update (
IN OUT VOID *HmacSha1Context,
IN CONST VOID *Data,
IN UINTN DataSize
)
{
//
// ASSERT if HmacSha1Context is NULL
//
ASSERT (HmacSha1Context != NULL);
//
// ASSERT if invalid parameters, in case that only DataLength was checked in OpenSSL
//
if (Data == NULL) {
ASSERT (DataSize == 0);
}
//
// OpenSSL HMAC-SHA1 digest update
//
HMAC_Update (HmacSha1Context, Data, DataSize);
return TRUE;
}
/**
Completes computation of the HMAC-SHA1 digest value.
This function completes HMAC-SHA1 digest computation and retrieves the digest value into
the specified memory. After this function has been called, the HMAC-SHA1 context cannot
be used again.
HMAC-SHA1 context should be already correctly intialized by HmacSha1Init(), and should
not be finalized by HmacSha1Final(). Behavior with invalid HMAC-SHA1 context is undefined.
If HmacSha1Context is NULL, then ASSERT().
If HmacValue is NULL, then ASSERT().
@param[in, out] HmacSha1Context Pointer to the HMAC-SHA1 context.
@param[out] HmacValue Pointer to a buffer that receives the HMAC-SHA1 digest
value (20 bytes).
@retval TRUE HMAC-SHA1 digest computation succeeded.
@retval FALSE HMAC-SHA1 digest computation failed.
**/
BOOLEAN
EFIAPI
HmacSha1Final (
IN OUT VOID *HmacSha1Context,
OUT UINT8 *HmacValue
)
{
UINT32 Length;
//
// ASSERT if HmacSha1Context is NULL or HmacValue is NULL
//
ASSERT (HmacSha1Context != NULL);
ASSERT (HmacValue != NULL);
//
// OpenSSL HMAC-SHA1 digest finalization
//
HMAC_Final (HmacSha1Context, HmacValue, &Length);
HMAC_CTX_cleanup (HmacSha1Context);
return TRUE;
}
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