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/** @file
HMAC-MD5 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-MD5 operations.
@return The size, in bytes, of the context buffer required for HMAC-MD5 operations.
**/
UINTN
EFIAPI
HmacMd5GetContextSize (
VOID
)
{
//
// Retrieves the OpenSSL HMAC-MD5 Context Size
//
return (UINTN)(sizeof (HMAC_CTX));
}
/**
Initializes user-supplied memory pointed by HmacMd5Context as HMAC-MD5 context for
subsequent use.
If HmacMd5Context is NULL, then ASSERT().
@param[out] HmacMd5Context Pointer to HMAC-MD5 context being initialized.
@param[in] Key Pointer to the user-supplied key.
@param[in] KeySize Key size in bytes.
@retval TRUE HMAC-MD5 context initialization succeeded.
@retval FALSE HMAC-MD5 context initialization failed.
**/
BOOLEAN
EFIAPI
HmacMd5Init (
OUT VOID *HmacMd5Context,
IN CONST UINT8 *Key,
IN UINTN KeySize
)
{
//
// ASSERT if HmacMd5Context is NULL.
//
ASSERT (HmacMd5Context != NULL);
//
// OpenSSL HMAC-MD5 Context Initialization
//
HMAC_CTX_init (HmacMd5Context);
HMAC_Init_ex (HmacMd5Context, Key, (UINT32) KeySize, EVP_md5(), NULL);
return TRUE;
}
/**
Makes a copy of an existing HMAC-MD5 context.
If HmacMd5Context is NULL, then ASSERT().
If NewHmacMd5Context is NULL, then ASSERT().
@param[in] HmacMd5Context Pointer to HMAC-MD5 context being copied.
@param[out] NewHmacMd5Context Pointer to new HMAC-MD5 context.
@retval TRUE HMAC-MD5 context copy succeeded.
@retval FALSE HMAC-MD5 context copy failed.
**/
BOOLEAN
EFIAPI
HmacMd5Duplicate (
IN CONST VOID *HmacMd5Context,
OUT VOID *NewHmacMd5Context
)
{
CopyMem (NewHmacMd5Context, HmacMd5Context, sizeof (HMAC_CTX));
return TRUE;
}
/**
Digests the input data and updates HMAC-MD5 context.
This function performs HMAC-MD5 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-MD5 context should be already correctly intialized by HmacMd5Init(), and should not be
finalized by HmacMd5Final(). Behavior with invalid context is undefined.
If HmacMd5Context is NULL, then ASSERT().
@param[in, out] HmacMd5Context Pointer to the HMAC-MD5 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-MD5 data digest succeeded.
@retval FALSE HMAC-MD5 data digest failed.
**/
BOOLEAN
EFIAPI
HmacMd5Update (
IN OUT VOID *HmacMd5Context,
IN CONST VOID *Data,
IN UINTN DataSize
)
{
//
// ASSERT if HmacMd5Context is NULL
//
ASSERT (HmacMd5Context != NULL);
//
// ASSERT if invalid parameters, in case that only DataLength was checked in OpenSSL
//
if (Data == NULL) {
ASSERT (DataSize == 0);
}
//
// OpenSSL HMAC-MD5 digest update
//
HMAC_Update (HmacMd5Context, Data, DataSize);
return TRUE;
}
/**
Completes computation of the HMAC-MD5 digest value.
This function completes HMAC-MD5 digest computation and retrieves the digest value into
the specified memory. After this function has been called, the HMAC-MD5 context cannot
be used again.
HMAC-MD5 context should be already correctly intialized by HmacMd5Init(), and should not be
finalized by HmacMd5Final(). Behavior with invalid HMAC-MD5 context is undefined.
If HmacMd5Context is NULL, then ASSERT().
If HmacValue is NULL, then ASSERT().
@param[in, out] HmacMd5Context Pointer to the HMAC-MD5 context.
@param[out] HmacValue Pointer to a buffer that receives the HMAC-MD5 digest
value (16 bytes).
@retval TRUE HMAC-MD5 digest computation succeeded.
@retval FALSE HMAC-MD5 digest computation failed.
**/
BOOLEAN
EFIAPI
HmacMd5Final (
IN OUT VOID *HmacMd5Context,
OUT UINT8 *HmacValue
)
{
UINT32 Length;
//
// ASSERT if HmacMd5Context is NULL or HmacValue is NULL
//
ASSERT (HmacMd5Context != NULL);
ASSERT (HmacValue != NULL);
//
// OpenSSL HMAC-MD5 digest finalization
//
HMAC_Final (HmacMd5Context, HmacValue, &Length);
HMAC_CTX_cleanup (HmacMd5Context);
return TRUE;
}
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