gcm_memory.c

这是由Rinick编写的加解密函数库。最近找了不少关于加解密的C源码

/* 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, [e-mail], http://libtomcrypt.org
 */

/**
   @file gcm_memory.c
   GCM implementation, process a packet, by Tom St Denis
*/
#include "tomcrypt.h"

#ifdef GCM_MODE

/**
  Process an entire GCM packet in one call.
  @param cipher            Index of cipher to use
  @param key               The secret key
  @param keylen            The length of the secret key
  @param IV                The initial vector 
  @param IVlen             The length of the initial vector
  @param adata             The additional authentication data (header)
  @param adatalen          The length of the adata
  @param pt                The plaintext
  @param ptlen             The length of the plaintext (ciphertext length is the same)
  @param ct                The ciphertext
  @param tag               [out] The MAC tag
  @param taglen            [in/out] The MAC tag length
  @param direction         Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT)
  @return CRYPT_OK on success
 */
int gcm_memory(      int           cipher,
               const unsigned char *key,    unsigned long keylen,
               const unsigned char *IV,     unsigned long IVlen,
               const unsigned char *adata,  unsigned long adatalen,
                     unsigned char *pt,     unsigned long ptlen,
                     unsigned char *ct, 
                     unsigned char *tag,    unsigned long *taglen,
                               int direction)
{
    gcm_state *gcm;
    int        err;

    if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
       return err;
    }
 
    if (cipher_descriptor[cipher].accel_gcm_memory != NULL) {
       cipher_descriptor[cipher].accel_gcm_memory
                                          (key,   keylen,
                                           IV,    IVlen,
                                           adata, adatalen,
                                           pt,    ptlen,
                                           ct,
                                           tag,   taglen,
                                           direction);
       return CRYPT_OK;
    }


    gcm = XMALLOC(sizeof(*gcm));
    if (gcm == NULL) {
        return CRYPT_MEM;
    }

    if ((err = gcm_init(gcm, cipher, key, keylen)) != CRYPT_OK) {
       goto LTC_ERR;
    }
    if ((err = gcm_add_iv(gcm, IV, IVlen)) != CRYPT_OK) {
       goto LTC_ERR;
    }
    if ((err = gcm_add_aad(gcm, adata, adatalen)) != CRYPT_OK) {
       goto LTC_ERR;
    }
    if ((err = gcm_process(gcm, pt, ptlen, ct, direction)) != CRYPT_OK) {
       goto LTC_ERR;
    }
    err = gcm_done(gcm, tag, taglen);
LTC_ERR:
    XFREE(gcm);
    return err;
}
#endif


/* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_memory.c,v $ */
/* $Revision: 1.19 $ */
/* $Date: 2005/05/05 14:35:58 $ */