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aes_cfb.c

/* crypto/aes/aes_cfb.c -*- mode:C; c-file-style: "eay" -*- */
/* ====================================================================
 * Copyright (c) 2002-2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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 *    openssl-core@openssl.org.
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 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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#include <openssl/aes.h>
#include <openssl/modes.h>

/* The input and output encrypted as though 128bit cfb mode is being
 * used.  The extra state information to record how much of the
 * 128bit block we have used is contained in *num;
 */

void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out,
      size_t length, const AES_KEY *key,
      unsigned char *ivec, int *num, const int enc) {

      CRYPTO_cfb128_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt);
}

/* N.B. This expects the input to be packed, MS bit first */
void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out,
                  size_t length, const AES_KEY *key,
                  unsigned char *ivec, int *num, const int enc)
    {
    CRYPTO_cfb128_1_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt);
    }

void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
                  size_t length, const AES_KEY *key,
                  unsigned char *ivec, int *num, const int enc)
    {
    CRYPTO_cfb128_8_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt);
    }


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