[Opentnl-cvs] tnl/libtomcrypt/modes/ctr ctr_decrypt.c,NONE,1.1 ctr_done.c,NONE,1.1 ctr_encrypt.c,NON

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

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

Added Files:
	ctr_decrypt.c ctr_done.c ctr_encrypt.c ctr_getiv.c ctr_setiv.c 
	ctr_start.c 
Log Message:
Updated to libtomcrypt 1.0.2
Not tested on linux or OS X

--- NEW FILE: ctr_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 ctr_decrypt.c
  CTR implementation, decrypt data, Tom St Denis
*/

#ifdef CTR

/**
   CTR decrypt
   @param ct      Ciphertext
   @param pt      [out] Plaintext
   @param len     Length of ciphertext (octets)
   @param ctr     CTR state
   @return CRYPT_OK if successful
*/
int ctr_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CTR *ctr)
{
   LTC_ARGCHK(pt != NULL);
   LTC_ARGCHK(ct != NULL);
   LTC_ARGCHK(ctr != NULL);

   return ctr_encrypt(ct, pt, len, ctr);
}

#endif


--- NEW FILE: ctr_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 ctr_done.c
   CTR implementation, finish chain, Tom St Denis
*/

#ifdef CTR

/** Terminate the chain
  @param ctr    The CTR chain to terminate
  @return CRYPT_OK on success
*/
int ctr_done(symmetric_CTR *ctr)
{
   int err;
   LTC_ARGCHK(ctr != NULL);

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

   
#endif

--- NEW FILE: ctr_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 ctr_setiv.c
  CTR implementation, set IV, Tom St Denis
*/
  
#ifdef CTR

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

   /* bad param? */
   if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
      return err;
   }
   
   if (len != (unsigned long)ctr->blocklen) {
      return CRYPT_INVALID_ARG;
   }

   /* set IV */
   XMEMCPY(ctr->ctr, IV, len);
   
   /* force next block */
   ctr->padlen = 0;
   cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
   
   return CRYPT_OK;
}

#endif 


--- NEW FILE: ctr_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 ctr_encrypt.c
  CTR implementation, encrypt data, Tom St Denis
*/


#ifdef CTR

/**
  CTR encrypt
  @param pt     Plaintext
  @param ct     [out] Ciphertext
  @param len    Length of plaintext (octets)
  @param ctr    CTR state
  @return CRYPT_OK if successful
*/
int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
{
   int x, err;

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

   if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
       return err;
   }
   
   /* is blocklen/padlen valid? */
   if (ctr->blocklen < 0 || ctr->blocklen > (int)sizeof(ctr->ctr) ||
       ctr->padlen   < 0 || ctr->padlen   > (int)sizeof(ctr->pad)) {
      return CRYPT_INVALID_ARG;
   }

#ifdef LTC_FAST
   if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) {
      return CRYPT_INVALID_ARG;
   }
#endif
   
   /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */
   if ((ctr->padlen == ctr->blocklen) && cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL && (len >= (unsigned long)ctr->blocklen)) {
      cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key);
      len %= ctr->blocklen;
   }

   while (len) {
      /* is the pad empty? */
      if (ctr->padlen == ctr->blocklen) {
         /* increment counter */
         if (ctr->mode == 0) {
            /* little-endian */
            for (x = 0; x < ctr->blocklen; x++) {
               ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
               if (ctr->ctr[x] != (unsigned char)0) {
                  break;
               }
            }
         } else {
            /* big-endian */
            for (x = ctr->blocklen-1; x >= 0; x--) {
               ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
               if (ctr->ctr[x] != (unsigned char)0) {
                  break;
               }
            }
         }

         /* encrypt it */
         cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
         ctr->padlen = 0;
      }
#ifdef LTC_FAST
      if (ctr->padlen == 0 && len >= (unsigned long)ctr->blocklen) {
         for (x = 0; x < ctr->blocklen; x += sizeof(LTC_FAST_TYPE)) {
            *((LTC_FAST_TYPE*)((unsigned char *)ct + x)) = *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) ^
                                                           *((LTC_FAST_TYPE*)((unsigned char *)ctr->pad + x));
         }
	    pt         += ctr->blocklen;
	    ct         += ctr->blocklen;
	    len        -= ctr->blocklen;
	    ctr->padlen = ctr->blocklen;
	    continue;
	 }
#endif	 
    *ct++ = *pt++ ^ ctr->pad[ctr->padlen++];
	 --len;
   }
   return CRYPT_OK;
}

#endif

--- NEW FILE: ctr_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 ctr_getiv.c
   CTR implementation, get IV, Tom St Denis
*/

#ifdef CTR

/**
   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 ctr  The CTR state
   @return CRYPT_OK if successful
*/
int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
{
   LTC_ARGCHK(IV  != NULL);
   LTC_ARGCHK(len != NULL);
   LTC_ARGCHK(ctr != NULL);
   if ((unsigned long)ctr->blocklen > *len) {
      return CRYPT_BUFFER_OVERFLOW;
   }
   XMEMCPY(IV, ctr->ctr, ctr->blocklen);
   *len = ctr->blocklen;

   return CRYPT_OK;
}

#endif

--- NEW FILE: ctr_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 ctr_start.c
   CTR implementation, start chain, Tom St Denis
*/


#ifdef CTR

/**
   Initialize a CTR context
   @param cipher      The index of the cipher desired
   @param count       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 ctr         The CTR state to initialize
   @return CRYPT_OK if successful
*/
int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen, 
              int num_rounds, symmetric_CTR *ctr)
{
   int x, err;

   LTC_ARGCHK(count != NULL);
   LTC_ARGCHK(key != NULL);
   LTC_ARGCHK(ctr != NULL);

   /* bad param? */
   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
      return err;
   }

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

   /* copy ctr */
   ctr->blocklen = cipher_descriptor[cipher].block_length;
   ctr->cipher   = cipher;
   ctr->padlen   = 0;
   ctr->mode     = 0;
   for (x = 0; x < ctr->blocklen; x++) {
       ctr->ctr[x] = count[x];
   }
   cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
   return CRYPT_OK;
}

#endif

[Opentnl-cvs] tnl/libtomcrypt/modes/ctr ctr_decrypt.c,NONE,1.1 ctr_done.c,NONE,1.1 ctr_encrypt.c,NON

[Opentnl-cvs] tnl/libtomcrypt/modes/ctr ctr_decrypt.c,NONE,1.1 ctr_done.c,NONE,1.1 ctr_encrypt.c,NONE,1.1 ctr_getiv.c,NONE,1.1 ctr_setiv.c,NONE,1.1 ctr_start.c,NONE,1.1