C++ (Cpp) do_cbc_decrypt Examples

Example #1

File: cipher.c Project: OpenInkpot-archive/iplinux-gnupg

/****************
 * Decrypt INBUF to OUTBUF with the mode selected at open.
 * inbuf and outbuf may overlap or be the same.
 * Depending on the mode some some contraints apply to NBYTES.
 */
void
cipher_decrypt( CIPHER_HANDLE c, byte *outbuf, byte *inbuf, unsigned nbytes )
{
    switch( c->mode ) {
    case CIPHER_MODE_ECB:
        assert(!(nbytes%c->blocksize));
        do_ecb_decrypt(c, outbuf, inbuf, nbytes/c->blocksize );
        break;
    case CIPHER_MODE_CBC:
        assert(!(nbytes%c->blocksize));
        do_cbc_decrypt(c, outbuf, inbuf, nbytes/c->blocksize );
        break;
    case CIPHER_MODE_CFB:
    case CIPHER_MODE_PHILS_CFB:
        do_cfb_decrypt(c, outbuf, inbuf, nbytes );
        break;
#ifdef ALLOW_DUMMY
    case CIPHER_MODE_DUMMY:
        if( inbuf != outbuf )
            memmove( outbuf, inbuf, nbytes );
        break;
#endif
    default:
        log_fatal("cipher_decrypt: invalid mode %d\n", c->mode );
    }
}

Example #2

File: cipher.c Project: EmeraldViewer/EmeraldViewer

/****************
 * Decrypt INBUF to OUTBUF with the mode selected at open.
 * inbuf and outbuf may overlap or be the same.
 * Depending on the mode some some contraints apply to NBYTES.
 */
static gcry_err_code_t
cipher_decrypt (gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
		unsigned int nbytes)
{
    gcry_err_code_t rc = GPG_ERR_NO_ERROR;

    switch( c->mode ) {
      case GCRY_CIPHER_MODE_ECB:
	if (!(nbytes%c->cipher->blocksize))
            do_ecb_decrypt(c, outbuf, inbuf, nbytes/c->cipher->blocksize );
        else 
            rc = GPG_ERR_INV_ARG;
	break;
      case GCRY_CIPHER_MODE_CBC:
	if (!(nbytes%c->cipher->blocksize)
            || (nbytes > c->cipher->blocksize
                && (c->flags & GCRY_CIPHER_CBC_CTS)))
            do_cbc_decrypt(c, outbuf, inbuf, nbytes );
        else 
            rc = GPG_ERR_INV_ARG;
	break;
      case GCRY_CIPHER_MODE_CFB:
	do_cfb_decrypt(c, outbuf, inbuf, nbytes );
	break;
      case GCRY_CIPHER_MODE_CTR:
	do_ctr_decrypt(c, outbuf, inbuf, nbytes );
	break;
      case GCRY_CIPHER_MODE_STREAM:
        c->cipher->stdecrypt ( &c->context.c,
                               outbuf, (byte*)/*arggg*/inbuf, nbytes );
        break;
      case GCRY_CIPHER_MODE_NONE:
	if( inbuf != outbuf )
	    memmove( outbuf, inbuf, nbytes );
	break;
      default:
        log_fatal ("cipher_decrypt: invalid mode %d\n", c->mode );
        rc = GPG_ERR_INV_CIPHER_MODE;
        break;
    }
    return rc;
}