/****************************************************************************
*																			*
*							cryptlib MD5 Hash Routines						*
*						Copyright Peter Gutmann 1992-2005					*
*																			*
****************************************************************************/

#if defined( INC_ALL )
  #include "crypt.h"
  #include "context.h"
  #include "md5.h"
#else
  #include "crypt.h"
  #include "context/context.h"
  #include "crypt/md5.h"
#endif /* Compiler-specific includes */

#define HASH_STATE_SIZE		sizeof( MD5_CTX )

/****************************************************************************
*																			*
*								MD5 Self-test Routines						*
*																			*
****************************************************************************/

/* Test the MD5 output against the test vectors given in RFC 1321 */

void md5HashBuffer( HASHINFO hashInfo, BYTE *outBuffer, 
					const int outBufMaxLength, const BYTE *inBuffer, 
					const int inLength, const HASH_STATE hashState );

static const struct {
	const char *data;						/* Data to hash */
	const int length;						/* Length of data */
	const BYTE digest[ MD5_DIGEST_LENGTH ];	/* Digest of data */
	} FAR_BSS digestValues[] = {
	{ "", 0,
	  { 0xD4, 0x1D, 0x8C, 0xD9, 0x8F, 0x00, 0xB2, 0x04,
		0xE9, 0x80, 0x09, 0x98, 0xEC, 0xF8, 0x42, 0x7E } },
	{ "a", 1,
	  { 0x0C, 0xC1, 0x75, 0xB9, 0xC0, 0xF1, 0xB6, 0xA8,
		0x31, 0xC3, 0x99, 0xE2, 0x69, 0x77, 0x26, 0x61 } },
	{ "abc", 3,
	  { 0x90, 0x01, 0x50, 0x98, 0x3C, 0xD2, 0x4F, 0xB0,
		0xD6, 0x96, 0x3F, 0x7D, 0x28, 0xE1, 0x7F, 0x72 } },
	{ "message digest", 14,
	  { 0xF9, 0x6B, 0x69, 0x7D, 0x7C, 0xB7, 0x93, 0x8D,
		0x52, 0x5A, 0x2F, 0x31, 0xAA, 0xF1, 0x61, 0xD0 } },
	{ "abcdefghijklmnopqrstuvwxyz", 26,
	  { 0xC3, 0xFC, 0xD3, 0xD7, 0x61, 0x92, 0xE4, 0x00,
		0x7D, 0xFB, 0x49, 0x6C, 0xCA, 0x67, 0xE1, 0x3B } },
	{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", 62,
	  { 0xD1, 0x74, 0xAB, 0x98, 0xD2, 0x77, 0xD9, 0xF5,
		0xA5, 0x61, 0x1C, 0x2C, 0x9F, 0x41, 0x9D, 0x9F } },
	{ "12345678901234567890123456789012345678901234567890123456789012345678901234567890", 80,
	  { 0x57, 0xED, 0xF4, 0xA2, 0x2B, 0xE3, 0xC9, 0x55,
		0xAC, 0x49, 0xDA, 0x2E, 0x21, 0x07, 0xB6, 0x7A } },
	{ NULL, 0, { 0 } }
	};

static int selfTest( void )
	{
	const CAPABILITY_INFO *capabilityInfo = getMD5Capability();
	CONTEXT_INFO contextInfo;
	HASH_INFO contextData;
	BYTE keyData[ HASH_STATE_SIZE + 8 ];
	int i, status;

	/* Test MD5 against the test vectors given in RFC 1320 */
	for( i = 0; digestValues[ i ].data != NULL; i++ )
		{
		staticInitContext( &contextInfo, CONTEXT_HASH, capabilityInfo,
						   &contextData, sizeof( HASH_INFO ), keyData );
		status = CRYPT_OK ;
		if( digestValues[ i ].length > 0 )
			{
			status = capabilityInfo->encryptFunction( &contextInfo,
								( BYTE * ) digestValues[ i ].data,
								digestValues[ i ].length );
			contextInfo.flags |= CONTEXT_HASH_INITED;
			}
		if( cryptStatusOK( status ) )
			status = capabilityInfo->encryptFunction( &contextInfo, NULL, 0 );
		if( cryptStatusOK( status ) && \
			memcmp( contextInfo.ctxHash->hash, digestValues[ i ].digest,
					MD5_DIGEST_LENGTH ) )
			status = CRYPT_ERROR;
		staticDestroyContext( &contextInfo );
		if( cryptStatusError( status ) )
			return( status );
		}

	return( CRYPT_OK );
	}

/****************************************************************************
*																			*
*								Control Routines							*
*																			*
****************************************************************************/

/* Return context subtype-specific information */

static int getInfo( const CAPABILITY_INFO_TYPE type, void *varParam,
					const int constParam )
	{
	if( type == CAPABILITY_INFO_STATESIZE )
		return( HASH_STATE_SIZE );

	return( getDefaultInfo( type, varParam, constParam ) );
	}

/****************************************************************************
*																			*
*								MD5 Hash Routines							*
*																			*
****************************************************************************/

/* Hash data using MD5 */

static int hash( CONTEXT_INFO *contextInfoPtr, BYTE *buffer, int noBytes )
	{
	MD5_CTX *md5Info = ( MD5_CTX * ) contextInfoPtr->ctxHash->hashInfo;

	/* If the hash state was reset to allow another round of hashing,
	   reinitialise things */
	if( !( contextInfoPtr->flags & CONTEXT_HASH_INITED ) )
		MD5_Init( md5Info );

	if( noBytes > 0 )
		MD5_Update( md5Info, buffer, noBytes );
	else
		MD5_Final( contextInfoPtr->ctxHash->hash, md5Info );

	return( CRYPT_OK );
	}

/* Internal API: Hash a single block of memory without the overhead of
   creating an encryption context */

void md5HashBuffer( HASHINFO hashInfo, BYTE *outBuffer, 
					const int outBufMaxLength, const BYTE *inBuffer, 
					const int inLength, const HASH_STATE hashState )
	{
	MD5_CTX *md5Info = ( MD5_CTX * ) hashInfo;

	assert( ( hashState == HASH_ALL && hashInfo == NULL ) || \
			( hashState != HASH_ALL && \
			  isWritePtr( hashInfo, sizeof( HASHINFO ) ) ) );
	assert( ( ( hashState != HASH_END && hashState != HASH_ALL ) && \
			  outBuffer == NULL && outBufMaxLength == 0 ) || \
			( ( hashState == HASH_END || hashState == HASH_ALL ) && \
			  isWritePtr( outBuffer, outBufMaxLength ) && \
			  outBufMaxLength >= 16 ) );
	assert( inBuffer == NULL || isReadPtr( inBuffer, inLength ) );

	switch( hashState )
		{
		case HASH_START:
			MD5_Init( md5Info );
			/* Drop through */

		case HASH_CONTINUE:
			MD5_Update( md5Info, ( BYTE * ) inBuffer, inLength );
			break;

		case HASH_END:
			if( inBuffer != NULL )
				MD5_Update( md5Info, ( BYTE * ) inBuffer, inLength );
			MD5_Final( outBuffer, md5Info );
			break;

		case HASH_ALL:
			{
			MD5_CTX md5InfoBuffer;

			MD5_Init( &md5InfoBuffer );
			MD5_Update( &md5InfoBuffer, ( BYTE * ) inBuffer, inLength );
			MD5_Final( outBuffer, &md5InfoBuffer );
			zeroise( &md5InfoBuffer, sizeof( MD5_CTX ) );
			break;
			}

		default:
			assert( NOTREACHED );
		}
	}

/****************************************************************************
*																			*
*						Capability Access Routines							*
*																			*
****************************************************************************/

static const CAPABILITY_INFO FAR_BSS capabilityInfo = {
	CRYPT_ALGO_MD5, bitsToBytes( 128 ), "MD5",
	bitsToBytes( 0 ), bitsToBytes( 0 ), bitsToBytes( 0 ),
	selfTest, getInfo, NULL, NULL, NULL, NULL, hash, hash
	};

const CAPABILITY_INFO *getMD5Capability( void )
	{
	return( &capabilityInfo );
	}
