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Файл:Документация по криптоалгоритмам / cryptlib110 / lib_des
.c#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "crypt.h"
#include "libdes/des.h"
/* The DES key and block size */
#define DES_KEYSIZE 7
#define DES_BLOCKSIZE 8
/* The size of the keyscheduled DES key */
#define DES_EXPANDED_KEYSIZE sizeof( Key_schedule )
/****************************************************************************
* *
* DES Self-test Routines *
* *
****************************************************************************/
#include "testdes.h"
/* Test the DES implementation against the test vectors given in NBS Special
Publication 500-20, 1980. We need to perform the tests at a very low
level since the encryption library hasn't been intialized yet */
static int desTestLoop( DES_TEST *testData, int iterations, int operation )
{
BYTE temp[ DES_BLOCKSIZE ];
BYTE key[ DES_EXPANDED_KEYSIZE ];
int i;
for( i = 0; i < iterations; i++ )
{
memcpy( temp, testData[ i ].plaintext, DES_BLOCKSIZE );
key_sched( ( C_Block * ) testData[ i ].key,
*( ( Key_schedule * ) key ) );
des_ecb_encrypt( ( C_Block * ) temp, ( C_Block * ) temp,
*( ( Key_schedule * ) key ), operation );
if( memcmp( testData[ i ].ciphertext, temp, DES_BLOCKSIZE ) )
return( CRYPT_ERROR );
}
return( CRYPT_OK );
}
int desSelfTest( void )
{
UNUSED( testIPname );
UNUSED( testVPname );
UNUSED( testKPname );
UNUSED( testRSname );
UNUSED( testDPname );
UNUSED( testSBname );
/* Check the DES test vectors */
if( ( desTestLoop( testIP, sizeof( testIP ) / sizeof( DES_TEST ),
DES_ENCRYPT ) != CRYPT_OK ) || \
( desTestLoop( testVP, sizeof( testVP ) / sizeof( DES_TEST ),
DES_ENCRYPT ) != CRYPT_OK ) || \
( desTestLoop( testKP, sizeof( testKP ) / sizeof( DES_TEST ),
DES_ENCRYPT ) != CRYPT_OK ) || \
( desTestLoop( testRS, sizeof( testRS ) / sizeof( DES_TEST ),
DES_DECRYPT ) != CRYPT_OK ) || \
( desTestLoop( testDP, sizeof( testDP ) / sizeof( DES_TEST ),
DES_ENCRYPT ) != CRYPT_OK ) || \
( desTestLoop( testSB, sizeof( testSB ) / sizeof( DES_TEST ),
DES_ENCRYPT ) != CRYPT_OK ) )
return( CRYPT_SELFTEST );
return( CRYPT_OK );
}
/****************************************************************************
* *
* Init/Shutdown Routines *
* *
****************************************************************************/
/* Perform auxiliary init and shutdown actions on an encryption context */
int desInitEx( CRYPT_INFO *cryptInfo, void *cryptInfoEx )
{
UNUSED( cryptInfoEx );
/* Allocate memory for the keyscheduled key */
if( cryptInfo->key != NULL || cryptInfo->privateData != NULL )
return( CRYPT_INITED );
if( ( cryptInfo->key = malloc( DES_EXPANDED_KEYSIZE ) ) == NULL )
return( CRYPT_NOMEM );
memset( cryptInfo->key, 0, DES_EXPANDED_KEYSIZE );
cryptInfo->keyLength = DES_EXPANDED_KEYSIZE;
return( CRYPT_OK );
}
int desInit( CRYPT_INFO *cryptInfo )
{
/* Just pass the call through to the extended setup routine */
return( desInitEx( cryptInfo, NULL ) );
}
int desEnd( CRYPT_INFO *cryptInfo )
{
/* Free any allocated memory */
secureFree( &cryptInfo->key, cryptInfo->keyLength );
return( CRYPT_OK );
}
/****************************************************************************
* *
* DES En/Decryption Routines *
* *
****************************************************************************/
/* Encrypt/decrypt data in ECB mode */
int desEncryptECB( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
int blockCount = noBytes / DES_BLOCKSIZE;
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
while( blockCount-- )
{
/* Encrypt a block of data */
des_ecb_encrypt( ( C_Block * ) buffer, ( C_Block * ) buffer,
cryptInfo->key, DES_ENCRYPT );
/* Move on to next block of data */
buffer += DES_BLOCKSIZE;
}
return( CRYPT_OK );
}
int desDecryptECB( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
int blockCount = noBytes / DES_BLOCKSIZE;
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
while( blockCount-- )
{
/* Decrypt a block of data */
des_ecb_encrypt( ( C_Block * ) buffer, ( C_Block * ) buffer,
cryptInfo->key, DES_DECRYPT );
/* Move on to next block of data */
buffer += DES_BLOCKSIZE;
}
return( CRYPT_OK );
}
/* Encrypt/decrypt data in CBC mode */
int desEncryptCBC( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
int blockCount = noBytes / DES_BLOCKSIZE;
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
while( blockCount-- )
{
int i;
/* XOR the buffer contents with the IV */
for( i = 0; i < DES_BLOCKSIZE; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ];
/* Encrypt a block of data */
des_ecb_encrypt( ( C_Block * ) buffer, ( C_Block * ) buffer,
cryptInfo->key, DES_ENCRYPT );
/* Shift ciphertext into IV */
memcpy( cryptInfo->currentIV, buffer, DES_BLOCKSIZE );
/* Move on to next block of data */
buffer += DES_BLOCKSIZE;
}
return( CRYPT_OK );
}
int desDecryptCBC( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
BYTE temp[ DES_BLOCKSIZE ];
int blockCount = noBytes / DES_BLOCKSIZE;
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
while( blockCount-- )
{
int i;
/* Save the ciphertext */
memcpy( temp, buffer, DES_BLOCKSIZE );
/* Decrypt a block of data */
des_ecb_encrypt( ( C_Block * ) buffer, ( C_Block * ) buffer,
cryptInfo->key, DES_DECRYPT );
/* XOR the buffer contents with the IV */
for( i = 0; i < DES_BLOCKSIZE; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ];
/* Shift the ciphertext into the IV */
memcpy( cryptInfo->currentIV, temp, DES_BLOCKSIZE );
/* Move on to next block of data */
buffer += DES_BLOCKSIZE;
}
/* Clear the temporary buffer */
memset( temp, 0, DES_BLOCKSIZE );
return( CRYPT_OK );
}
/* Encrypt/decrypt data in CFB mode */
int desEncryptCFB( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
int i, ivCount = cryptInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = DES_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Encrypt the data */
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i + ivCount ];
memcpy( cryptInfo->currentIV + ivCount, buffer, bytesToUse );
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes )
{
ivCount = ( noBytes > DES_BLOCKSIZE ) ? DES_BLOCKSIZE : noBytes;
/* Encrypt the IV */
des_ecb_encrypt( ( C_Block * ) cryptInfo->currentIV,
( C_Block * ) cryptInfo->currentIV,
cryptInfo->key, DES_ENCRYPT );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ];
/* Shift the ciphertext into the IV */
memcpy( cryptInfo->currentIV, buffer, ivCount );
/* Move on to next block of data */
noBytes -= ivCount;
buffer += ivCount;
}
/* Remember how much of the IV is still available for use */
cryptInfo->ivCount = ( ivCount % DES_BLOCKSIZE );
return( CRYPT_OK );
}
int desDecryptCFB( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
BYTE temp[ DES_BLOCKSIZE ];
int i, ivCount = cryptInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = DES_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Decrypt the data */
memcpy( temp, buffer, bytesToUse );
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i + ivCount ];
memcpy( cryptInfo->currentIV + ivCount, temp, bytesToUse );
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes )
{
ivCount = ( noBytes > DES_BLOCKSIZE ) ? DES_BLOCKSIZE : noBytes;
/* Encrypt the IV */
des_ecb_encrypt( ( C_Block * ) cryptInfo->currentIV,
( C_Block * ) cryptInfo->currentIV,
cryptInfo->key, DES_ENCRYPT );
/* Save the ciphertext */
memcpy( temp, buffer, ivCount );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ];
/* Shift the ciphertext into the IV */
memcpy( cryptInfo->currentIV, temp, ivCount );
/* Move on to next block of data */
noBytes -= ivCount;
buffer += ivCount;
}
/* Remember how much of the IV is still available for use */
cryptInfo->ivCount = ( ivCount % DES_BLOCKSIZE );
/* Clear the temporary buffer */
memset( temp, 0, DES_BLOCKSIZE );
return( CRYPT_OK );
}
/* Encrypt/decrypt data in OFB mode */
int desEncryptOFB( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
int i, ivCount = cryptInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = DES_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Encrypt the data */
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i + ivCount ];
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes )
{
ivCount = ( noBytes > DES_BLOCKSIZE ) ? DES_BLOCKSIZE : noBytes;
/* Encrypt the IV */
des_ecb_encrypt( ( C_Block * ) cryptInfo->currentIV,
( C_Block * ) cryptInfo->currentIV,
cryptInfo->key, DES_ENCRYPT );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ];
/* Move on to next block of data */
noBytes -= ivCount;
buffer += ivCount;
}
/* Remember how much of the IV is still available for use */
cryptInfo->ivCount = ( ivCount % DES_BLOCKSIZE );
return( CRYPT_OK );
}
int desDecryptOFB( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
int i, ivCount = cryptInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = DES_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Decrypt the data */
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i + ivCount ];
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes )
{
ivCount = ( noBytes > DES_BLOCKSIZE ) ? DES_BLOCKSIZE : noBytes;
/* Encrypt the IV */
des_ecb_encrypt( ( C_Block * ) cryptInfo->currentIV,
( C_Block * ) cryptInfo->currentIV,
cryptInfo->key, DES_ENCRYPT );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ];
/* Move on to next block of data */
noBytes -= ivCount;
buffer += ivCount;
}
/* Remember how much of the IV is still available for use */
cryptInfo->ivCount = ( ivCount % DES_BLOCKSIZE );
return( CRYPT_OK );
}
/* Encrypt/decrypt data in PCBC mode. We have to carry along the previous
block's plaintext as well as the IV so we store it after the IV in the
buffer allocated for IV storage. Initially the plaintextChain value will
be null as the IV buffer is zeroed on init, so we don't need to worry
about the special case of the first ciphertext block */
int desEncryptPCBC( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
BYTE *plaintextChain = cryptInfo->currentIV + DES_BLOCKSIZE;
BYTE temp[ DES_BLOCKSIZE ];
int blockCount = noBytes / DES_BLOCKSIZE;
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
while( blockCount-- )
{
int i;
/* Remember the previous block's plaintext and copy the current
plaintext for chaining in the next iteration */
memcpy( temp, plaintextChain, DES_BLOCKSIZE );
memcpy( plaintextChain, buffer, DES_BLOCKSIZE );
/* XOR the buffer contents with the IV and previous plaintext */
for( i = 0; i < DES_BLOCKSIZE; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ] ^ temp[ i ];
/* Encrypt a block of data */
des_ecb_encrypt( ( C_Block * ) buffer, ( C_Block * ) buffer,
cryptInfo->key, DES_ENCRYPT );
/* Shift ciphertext into IV */
memcpy( cryptInfo->currentIV, buffer, DES_BLOCKSIZE );
/* Move on to next block of data */
buffer += DES_BLOCKSIZE;
}
/* Clear the temporary buffer */
memset( temp, 0, DES_BLOCKSIZE );
#if 0
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
/* Encrypt the entire buffer */
des_pcbc_encrypt( ( C_Block *) buffer, ( C_Block * ) buffer,
( long ) noBytes, cryptInfo->key,
( C_Block * ) cryptInfo->currentIV, DES_ENCRYPT );
#endif /* 0 */
return( CRYPT_OK );
}
int desDecryptPCBC( CRYPT_INFO *cryptInfo, BYTE *buffer, int noBytes )
{
BYTE *plaintextChain = cryptInfo->currentIV + DES_BLOCKSIZE;
BYTE temp[ DES_BLOCKSIZE ];
int blockCount = noBytes / DES_BLOCKSIZE;
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
while( blockCount-- )
{
int i;
/* Save the ciphertext */
memcpy( temp, buffer, DES_BLOCKSIZE );
/* Decrypt a block of data */
des_ecb_encrypt( ( C_Block * ) buffer, ( C_Block * ) buffer,
cryptInfo->key, DES_DECRYPT );
/* XOR the buffer contents with the IV and previous plaintext */
for( i = 0; i < DES_BLOCKSIZE; i++ )
buffer[ i ] ^= cryptInfo->currentIV[ i ] ^ plaintextChain[ i ];
/* Shift the ciphertext into the IV and copy the current plaintext
for chaining in the next iteration */
memcpy( cryptInfo->currentIV, temp, DES_BLOCKSIZE );
memcpy( plaintextChain, buffer, DES_BLOCKSIZE );
/* Move on to next block of data */
buffer += DES_BLOCKSIZE;
}
/* Clear the temporary buffer */
memset( temp, 0, DES_BLOCKSIZE );
#if 0
/* Make sure the data length is a multiple of the block size */
if( noBytes % DES_BLOCKSIZE )
return( CRYPT_BADPARM3 );
/* Decrypt the entire buffer */
des_pcbc_encrypt( ( C_Block *) buffer, ( C_Block * ) buffer,
( long ) noBytes, cryptInfo->key,
( C_Block * ) cryptInfo->currentIV, DES_DECRYPT );
#endif /* 0 */
return( CRYPT_OK );
}
/****************************************************************************
* *
* DES Key Management Routines *
* *
****************************************************************************/
/* Key schedule a DES key */
int desInitKey( CRYPT_INFO *cryptInfo )
{
/* Call the libdes key schedule code. Returns with -1 if the key parity
is wrong, -2 if a weak key is used */
if( key_sched( ( C_Block * ) cryptInfo->userKey,
*( ( Key_schedule * ) cryptInfo->key ) ) )
return( CRYPT_BADPARM );
return( CRYPT_OK );
}
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