[Opentnl-cvs] tnl/libtomcrypt/modes/cfb cfb_decrypt.c,NONE,1.1 cfb_done.c,NONE,1.1 cfb_encrypt.c,NONE,1.1 cfb_getiv.c,NONE,1.1 cfb_setiv.c,NONE,1.1 cfb_start.c,NONE,1.1

[Mark F. <mar...@us...>]

Update of /cvsroot/opentnl/tnl/libtomcrypt/modes/cfb
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv26694/libtomcrypt/modes/cfb

Added Files:
	cfb_decrypt.c cfb_done.c cfb_encrypt.c cfb_getiv.c cfb_setiv.c 
	cfb_start.c 
Log Message:
Updated to libtomcrypt 1.0.2
Not tested on linux or OS X

--- NEW FILE: cfb_start.c ---
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tom...@gm..., http://libtomcrypt.org
 */
#include "tomcrypt.h"

/**
   @file cfb_start.c
   CFB implementation, start chain, Tom St Denis
*/


#ifdef CFB

/**
   Initialize a CFB context
   @param cipher      The index of the cipher desired
   @param IV          The initial vector
   @param key         The secret key 
   @param keylen      The length of the secret key (octets)
   @param num_rounds  Number of rounds in the cipher desired (0 for default)
   @param cfb         The CFB state to initialize
   @return CRYPT_OK if successful
*/
int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key, 
              int keylen, int num_rounds, symmetric_CFB *cfb)
{
   int x, err;

   LTC_ARGCHK(IV != NULL);
   LTC_ARGCHK(key != NULL);
   LTC_ARGCHK(cfb != NULL);

   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
      return err;
   }
   

   /* copy data */
   cfb->cipher = cipher;
   cfb->blocklen = cipher_descriptor[cipher].block_length;
   for (x = 0; x < cfb->blocklen; x++)
       cfb->IV[x] = IV[x];

   /* init the cipher */
   if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) {
      return err;
   }

   /* encrypt the IV */
   cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key);
   cfb->padlen = 0;

   return CRYPT_OK;
}

#endif

--- NEW FILE: cfb_done.c ---
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tom...@gm..., http://libtomcrypt.org
 */
#include "tomcrypt.h"

/**
   @file cfb_done.c
   CFB implementation, finish chain, Tom St Denis
*/

#ifdef CFB

/** Terminate the chain
  @param cfb    The CFB chain to terminate
  @return CRYPT_OK on success
*/
int cfb_done(symmetric_CFB *cfb)
{
   int err;
   LTC_ARGCHK(cfb != NULL);

   if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
      return err;
   }
   cipher_descriptor[cfb->cipher].done(&cfb->key);
   return CRYPT_OK;
}

   

#endif

--- NEW FILE: cfb_decrypt.c ---
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tom...@gm..., http://libtomcrypt.org
 */
#include "tomcrypt.h"

/**
  @file cfb_decrypt.c
  CFB implementation, decrypt data, Tom St Denis
*/

#ifdef CFB

/**
   CFB decrypt
   @param ct      Ciphertext
   @param pt      [out] Plaintext
   @param len     Length of ciphertext (octets)
   @param cfb     CFB state
   @return CRYPT_OK if successful
*/
int cfb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CFB *cfb)
{
   int err;

   LTC_ARGCHK(pt != NULL);
   LTC_ARGCHK(ct != NULL);
   LTC_ARGCHK(cfb != NULL);

   if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
       return err;
   }

   /* is blocklen/padlen valid? */
   if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
       cfb->padlen   < 0 || cfb->padlen   > (int)sizeof(cfb->pad)) {
      return CRYPT_INVALID_ARG;
   }

   while (len-- > 0) {
       if (cfb->padlen == cfb->blocklen) {
          cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key);
          cfb->padlen = 0;
       }
       cfb->pad[cfb->padlen] = *ct;
       *pt = *ct ^ cfb->IV[cfb->padlen];
       ++pt; 
       ++ct;
       ++cfb->padlen;
   }
   return CRYPT_OK;
}

#endif


--- NEW FILE: cfb_getiv.c ---
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tom...@gm..., http://libtomcrypt.org
 */
#include "tomcrypt.h"

/**
   @file cfb_getiv.c
   CFB implementation, get IV, Tom St Denis
*/

#ifdef CFB

/**
   Get the current initial vector
   @param IV   [out] The destination of the initial vector
   @param len  [in/out]  The max size and resulting size of the initial vector
   @param cfb  The CFB state
   @return CRYPT_OK if successful
*/
int cfb_getiv(unsigned char *IV, unsigned long *len, symmetric_CFB *cfb)
{
   LTC_ARGCHK(IV  != NULL);
   LTC_ARGCHK(len != NULL);
   LTC_ARGCHK(cfb != NULL);
   if ((unsigned long)cfb->blocklen > *len) {
      return CRYPT_BUFFER_OVERFLOW;
   }
   XMEMCPY(IV, cfb->IV, cfb->blocklen);
   *len = cfb->blocklen;

   return CRYPT_OK;
}

#endif

--- NEW FILE: cfb_setiv.c ---
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tom...@gm..., http://libtomcrypt.org
 */
#include "tomcrypt.h"

/**
  @file cfb_setiv.c
  CFB implementation, set IV, Tom St Denis
*/  
#ifdef CFB

/**
   Set an initial vector
   @param IV   The initial vector
   @param len  The length of the vector (in octets)
   @param cfb  The CFB state
   @return CRYPT_OK if successful
*/
int cfb_setiv(const unsigned char *IV, unsigned long len, symmetric_CFB *cfb)
{
   int err;
   
   LTC_ARGCHK(IV  != NULL);
   LTC_ARGCHK(cfb != NULL);

   if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
       return err;
   }
   
   if (len != (unsigned long)cfb->blocklen) {
      return CRYPT_INVALID_ARG;
   }
      
   /* force next block */
   cfb->padlen = 0;
   cipher_descriptor[cfb->cipher].ecb_encrypt(IV, cfb->IV, &cfb->key);

   return CRYPT_OK;
}

#endif 


--- NEW FILE: cfb_encrypt.c ---
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tom...@gm..., http://libtomcrypt.org
 */
#include "tomcrypt.h"

/**
  @file cfb_encrypt.c
  CFB implementation, encrypt data, Tom St Denis
*/

#ifdef CFB

/**
  CFB encrypt
  @param pt     Plaintext
  @param ct     [out] Ciphertext
  @param len    Length of plaintext (octets)
  @param cfb    CFB state
  @return CRYPT_OK if successful
*/
int cfb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CFB *cfb)
{
   int err;

   LTC_ARGCHK(pt != NULL);
   LTC_ARGCHK(ct != NULL);
   LTC_ARGCHK(cfb != NULL);

   if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
       return err;
   }

   /* is blocklen/padlen valid? */
   if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
       cfb->padlen   < 0 || cfb->padlen   > (int)sizeof(cfb->pad)) {
      return CRYPT_INVALID_ARG;
   }

   while (len-- > 0) {
       if (cfb->padlen == cfb->blocklen) {
          cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key);
          cfb->padlen = 0;
       }
       cfb->pad[cfb->padlen] = (*ct = *pt ^ cfb->IV[cfb->padlen]);
       ++pt; 
       ++ct;
       ++cfb->padlen;
   }
   return CRYPT_OK;
}

#endif