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/** @file
MD5 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/md5.h>
/**
Retrieves the size, in bytes, of the context buffer required for MD5 hash operations.
@return The size, in bytes, of the context buffer required for MD5 hash operations.
**/
UINTN
EFIAPI
Md5GetContextSize (
VOID
)
{
//
// Retrieves the OpenSSL MD5 Context Size
//
return (UINTN) (sizeof (MD5_CTX));
}
/**
Initializes user-supplied memory pointed by Md5Context as MD5 hash context for
subsequent use.
If Md5Context is NULL, then return FALSE.
@param[out] Md5Context Pointer to MD5 context being initialized.
@retval TRUE MD5 context initialization succeeded.
@retval FALSE MD5 context initialization failed.
**/
BOOLEAN
EFIAPI
Md5Init (
OUT VOID *Md5Context
)
{
//
// Check input parameters.
//
if (Md5Context == NULL) {
return FALSE;
}
//
// OpenSSL MD5 Context Initialization
//
return (BOOLEAN) (MD5_Init ((MD5_CTX *) Md5Context));
}
/**
Makes a copy of an existing MD5 context.
If Md5Context is NULL, then return FALSE.
If NewMd5Context is NULL, then return FALSE.
@param[in] Md5Context Pointer to MD5 context being copied.
@param[out] NewMd5Context Pointer to new MD5 context.
@retval TRUE MD5 context copy succeeded.
@retval FALSE MD5 context copy failed.
**/
BOOLEAN
EFIAPI
Md5Duplicate (
IN CONST VOID *Md5Context,
OUT VOID *NewMd5Context
)
{
//
// Check input parameters.
//
if (Md5Context == NULL || NewMd5Context == NULL) {
return FALSE;
}
CopyMem (NewMd5Context, Md5Context, sizeof (MD5_CTX));
return TRUE;
}
/**
Digests the input data and updates MD5 context.
This function performs 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.
MD5 context should be already correctly intialized by Md5Init(), and should not be finalized
by Md5Final(). Behavior with invalid context is undefined.
If Md5Context is NULL, then return FALSE.
@param[in, out] Md5Context Pointer to the MD5 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 MD5 data digest succeeded.
@retval FALSE MD5 data digest failed.
**/
BOOLEAN
EFIAPI
Md5Update (
IN OUT VOID *Md5Context,
IN CONST VOID *Data,
IN UINTN DataSize
)
{
//
// Check input parameters.
//
if (Md5Context == NULL) {
return FALSE;
}
//
// Check invalid parameters, in case that only DataLength was checked in OpenSSL
//
if (Data == NULL && (DataSize != 0)) {
return FALSE;
}
//
// OpenSSL MD5 Hash Update
//
return (BOOLEAN) (MD5_Update ((MD5_CTX *) Md5Context, Data, DataSize));
}
/**
Completes computation of the MD5 digest value.
This function completes MD5 hash computation and retrieves the digest value into
the specified memory. After this function has been called, the MD5 context cannot
be used again.
MD5 context should be already correctly intialized by Md5Init(), and should not be
finalized by Md5Final(). Behavior with invalid MD5 context is undefined.
If Md5Context is NULL, then return FALSE.
If HashValue is NULL, then return FALSE.
@param[in, out] Md5Context Pointer to the MD5 context.
@param[out] HashValue Pointer to a buffer that receives the MD5 digest
value (16 bytes).
@retval TRUE MD5 digest computation succeeded.
@retval FALSE MD5 digest computation failed.
**/
BOOLEAN
EFIAPI
Md5Final (
IN OUT VOID *Md5Context,
OUT UINT8 *HashValue
)
{
//
// Check input parameters.
//
if (Md5Context == NULL || HashValue == NULL) {
return FALSE;
}
//
// OpenSSL MD5 Hash Finalization
//
return (BOOLEAN) (MD5_Final (HashValue, (MD5_CTX *) Md5Context));
}
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