📄 ctx_idea.c
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/****************************************************************************
* *
* cryptlib IDEA Encryption Routines *
* Copyright Peter Gutmann 1992-2005 *
* *
****************************************************************************/
#if defined( INC_ALL )
#include "crypt.h"
#include "context.h"
#include "idea.h"
#else
#include "crypt.h"
#include "context/context.h"
#include "crypt/idea.h"
#endif /* Compiler-specific includes */
#ifdef USE_IDEA
/* Defines to map from EAY to native naming */
#define IDEA_BLOCKSIZE IDEA_BLOCK
/* A structure to hold the two expanded IDEA keys */
typedef struct {
IDEA_KEY_SCHEDULE eKey, dKey;
} IDEA_KEY;
/* The size of the expanded IDEA keys */
#define IDEA_EXPANDED_KEYSIZE sizeof( IDEA_KEY )
/****************************************************************************
* *
* IDEA Self-test Routines *
* *
****************************************************************************/
/* IDEA test vectors, from the ETH reference implementation */
/* The data structure for the ( key, plaintext, ciphertext ) triplets */
typedef struct {
const BYTE key[ IDEA_KEY_LENGTH ];
const BYTE plaintext[ IDEA_BLOCKSIZE ];
const BYTE ciphertext[ IDEA_BLOCKSIZE ];
} IDEA_TEST;
static const IDEA_TEST FAR_BSS testIdea[] = {
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0x00, 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03 },
{ 0x11, 0xFB, 0xED, 0x2B, 0x01, 0x98, 0x6D, 0xE5 } },
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
{ 0x54, 0x0E, 0x5F, 0xEA, 0x18, 0xC2, 0xF8, 0xB1 } },
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0x00, 0x19, 0x32, 0x4B, 0x64, 0x7D, 0x96, 0xAF },
{ 0x9F, 0x0A, 0x0A, 0xB6, 0xE1, 0x0C, 0xED, 0x78 } },
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0xF5, 0x20, 0x2D, 0x5B, 0x9C, 0x67, 0x1B, 0x08 },
{ 0xCF, 0x18, 0xFD, 0x73, 0x55, 0xE2, 0xC5, 0xC5 } },
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0xFA, 0xE6, 0xD2, 0xBE, 0xAA, 0x96, 0x82, 0x6E },
{ 0x85, 0xDF, 0x52, 0x00, 0x56, 0x08, 0x19, 0x3D } },
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0x0A, 0x14, 0x1E, 0x28, 0x32, 0x3C, 0x46, 0x50 },
{ 0x2F, 0x7D, 0xE7, 0x50, 0x21, 0x2F, 0xB7, 0x34 } },
{ { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,
0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 },
{ 0x05, 0x0A, 0x0F, 0x14, 0x19, 0x1E, 0x23, 0x28 },
{ 0x7B, 0x73, 0x14, 0x92, 0x5D, 0xE5, 0x9C, 0x09 } },
{ { 0x00, 0x05, 0x00, 0x0A, 0x00, 0x0F, 0x00, 0x14,
0x00, 0x19, 0x00, 0x1E, 0x00, 0x23, 0x00, 0x28 },
{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
{ 0x3E, 0xC0, 0x47, 0x80, 0xBE, 0xFF, 0x6E, 0x20 } },
{ { 0x3A, 0x98, 0x4E, 0x20, 0x00, 0x19, 0x5D, 0xB3,
0x2E, 0xE5, 0x01, 0xC8, 0xC4, 0x7C, 0xEA, 0x60 },
{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
{ 0x97, 0xBC, 0xD8, 0x20, 0x07, 0x80, 0xDA, 0x86 } },
{ { 0x00, 0x64, 0x00, 0xC8, 0x01, 0x2C, 0x01, 0x90,
0x01, 0xF4, 0x02, 0x58, 0x02, 0xBC, 0x03, 0x20 },
{ 0x05, 0x32, 0x0A, 0x64, 0x14, 0xC8, 0x19, 0xFA },
{ 0x65, 0xBE, 0x87, 0xE7, 0xA2, 0x53, 0x8A, 0xED } },
{ { 0x9D, 0x40, 0x75, 0xC1, 0x03, 0xBC, 0x32, 0x2A,
0xFB, 0x03, 0xE7, 0xBE, 0x6A, 0xB3, 0x00, 0x06 },
{ 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08 },
{ 0xF5, 0xDB, 0x1A, 0xC4, 0x5E, 0x5E, 0xF9, 0xF9 } }
};
/* Test the IDEA code against the test vectors from the ETH reference
implementation */
static int selfTest( void )
{
const CAPABILITY_INFO *capabilityInfo = getIDEACapability();
BYTE keyData[ IDEA_EXPANDED_KEYSIZE + 8 ];
int i, status;
for( i = 0; i < sizeof( testIdea ) / sizeof( IDEA_TEST ); i++ )
{
status = testCipher( capabilityInfo, keyData, testIdea[ i ].key,
16, testIdea[ i ].plaintext,
testIdea[ i ].ciphertext );
if( cryptStatusError( status ) )
return( status );
}
return( CRYPT_OK );
}
/****************************************************************************
* *
* Control Routines *
* *
****************************************************************************/
/* Return context subtype-specific information */
static int getInfo( const CAPABILITY_INFO_TYPE type, const void *ptrParam,
const int intParam, int *result )
{
if( type == CAPABILITY_INFO_STATESIZE )
{
*result = IDEA_EXPANDED_KEYSIZE;
return( CRYPT_OK );
}
return( getDefaultInfo( type, ptrParam, intParam, result ) );
}
/****************************************************************************
* *
* IDEA En/Decryption Routines *
* *
****************************************************************************/
/* Encrypt/decrypt data in ECB mode */
static int encryptECB( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
int blockCount = noBytes / IDEA_BLOCKSIZE;
while( blockCount-- > 0 )
{
/* Encrypt a block of data */
idea_ecb_encrypt( buffer, buffer, &ideaKey->eKey );
/* Move on to next block of data */
buffer += IDEA_BLOCKSIZE;
}
return( CRYPT_OK );
}
static int decryptECB( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
int blockCount = noBytes / IDEA_BLOCKSIZE;
while( blockCount-- > 0 )
{
/* Decrypt a block of data */
idea_ecb_encrypt( buffer, buffer, &ideaKey->dKey );
/* Move on to next block of data */
buffer += IDEA_BLOCKSIZE;
}
return( CRYPT_OK );
}
/* Encrypt/decrypt data in CBC mode */
static int encryptCBC( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
idea_cbc_encrypt( buffer, buffer, noBytes,
&( ( IDEA_KEY * ) convInfo->key )->eKey,
convInfo->currentIV, IDEA_ENCRYPT );
return( CRYPT_OK );
}
static int decryptCBC( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
idea_cbc_encrypt( buffer, buffer, noBytes,
&( ( IDEA_KEY * ) convInfo->key )->dKey,
convInfo->currentIV, IDEA_DECRYPT );
return( CRYPT_OK );
}
/* Encrypt/decrypt data in CFB mode */
static int encryptCFB( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
int i, ivCount = convInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount > 0 )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = IDEA_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Encrypt the data */
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= convInfo->currentIV[ i + ivCount ];
memcpy( convInfo->currentIV + ivCount, buffer, bytesToUse );
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes > 0 )
{
ivCount = ( noBytes > IDEA_BLOCKSIZE ) ? IDEA_BLOCKSIZE : noBytes;
/* Encrypt the IV */
idea_ecb_encrypt( convInfo->currentIV, convInfo->currentIV,
&ideaKey->eKey );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= convInfo->currentIV[ i ];
/* Shift the ciphertext into the IV */
memcpy( convInfo->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 */
convInfo->ivCount = ( ivCount % IDEA_BLOCKSIZE );
return( CRYPT_OK );
}
/* Decrypt data in CFB mode. Note that the transformation can be made
faster (but less clear) with temp = buffer, buffer ^= iv, iv = temp
all in one loop */
static int decryptCFB( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
BYTE temp[ IDEA_BLOCKSIZE + 8 ];
int i, ivCount = convInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount > 0 )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = IDEA_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Decrypt the data */
memcpy( temp, buffer, bytesToUse );
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= convInfo->currentIV[ i + ivCount ];
memcpy( convInfo->currentIV + ivCount, temp, bytesToUse );
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes > 0 )
{
ivCount = ( noBytes > IDEA_BLOCKSIZE ) ? IDEA_BLOCKSIZE : noBytes;
/* Encrypt the IV */
idea_ecb_encrypt( convInfo->currentIV, convInfo->currentIV,
&ideaKey->eKey );
/* Save the ciphertext */
memcpy( temp, buffer, ivCount );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= convInfo->currentIV[ i ];
/* Shift the ciphertext into the IV */
memcpy( convInfo->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 */
convInfo->ivCount = ( ivCount % IDEA_BLOCKSIZE );
/* Clear the temporary buffer */
zeroise( temp, IDEA_BLOCKSIZE );
return( CRYPT_OK );
}
/* Encrypt/decrypt data in OFB mode */
static int encryptOFB( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
int i, ivCount = convInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount > 0 )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = IDEA_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Encrypt the data */
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= convInfo->currentIV[ i + ivCount ];
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes > 0 )
{
ivCount = ( noBytes > IDEA_BLOCKSIZE ) ? IDEA_BLOCKSIZE : noBytes;
/* Encrypt the IV */
idea_ecb_encrypt( convInfo->currentIV, convInfo->currentIV,
&ideaKey->eKey );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= convInfo->currentIV[ i ];
/* Move on to next block of data */
noBytes -= ivCount;
buffer += ivCount;
}
/* Remember how much of the IV is still available for use */
convInfo->ivCount = ( ivCount % IDEA_BLOCKSIZE );
return( CRYPT_OK );
}
/* Decrypt data in OFB mode */
static int decryptOFB( CONTEXT_INFO *contextInfoPtr, BYTE *buffer,
int noBytes )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
int i, ivCount = convInfo->ivCount;
/* If there's any encrypted material left in the IV, use it now */
if( ivCount > 0 )
{
int bytesToUse;
/* Find out how much material left in the encrypted IV we can use */
bytesToUse = IDEA_BLOCKSIZE - ivCount;
if( noBytes < bytesToUse )
bytesToUse = noBytes;
/* Decrypt the data */
for( i = 0; i < bytesToUse; i++ )
buffer[ i ] ^= convInfo->currentIV[ i + ivCount ];
/* Adjust the byte count and buffer position */
noBytes -= bytesToUse;
buffer += bytesToUse;
ivCount += bytesToUse;
}
while( noBytes > 0 )
{
ivCount = ( noBytes > IDEA_BLOCKSIZE ) ? IDEA_BLOCKSIZE : noBytes;
/* Encrypt the IV */
idea_ecb_encrypt( convInfo->currentIV, convInfo->currentIV,
&ideaKey->eKey );
/* XOR the buffer contents with the encrypted IV */
for( i = 0; i < ivCount; i++ )
buffer[ i ] ^= convInfo->currentIV[ i ];
/* Move on to next block of data */
noBytes -= ivCount;
buffer += ivCount;
}
/* Remember how much of the IV is still available for use */
convInfo->ivCount = ( ivCount % IDEA_BLOCKSIZE );
return( CRYPT_OK );
}
/****************************************************************************
* *
* IDEA Key Management Routines *
* *
****************************************************************************/
/* Key schedule an IDEA key */
static int initKey( CONTEXT_INFO *contextInfoPtr, const void *key,
const int keyLength )
{
CONV_INFO *convInfo = contextInfoPtr->ctxConv;
IDEA_KEY *ideaKey = ( IDEA_KEY * ) convInfo->key;
/* Copy the key to internal storage */
if( convInfo->userKey != key )
memcpy( convInfo->userKey, key, keyLength );
convInfo->userKeyLength = keyLength;
/* Generate the expanded IDEA encryption and decryption keys */
idea_set_encrypt_key( key, &ideaKey->eKey );
idea_set_decrypt_key( &ideaKey->eKey, &ideaKey->dKey );
return( CRYPT_OK );
}
/****************************************************************************
* *
* Capability Access Routines *
* *
****************************************************************************/
static const CAPABILITY_INFO FAR_BSS capabilityInfo = {
CRYPT_ALGO_IDEA, bitsToBytes( 64 ), "IDEA", 4,
MIN_KEYSIZE, bitsToBytes( 128 ), bitsToBytes( 128 ),
selfTest, getInfo, NULL, initKeyParams, initKey, NULL,
encryptECB, decryptECB, encryptCBC, decryptCBC,
encryptCFB, decryptCFB, encryptOFB, decryptOFB
};
const CAPABILITY_INFO *getIDEACapability( void )
{
return( &capabilityInfo );
}
#endif /* USE_IDEA */
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