crypto/aes/aes_cfb.c

   1 /*
   2  * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/aes.h>
  11 #include <openssl/modes.h>
  12
  13 /*
  14  * The input and output encrypted as though 128bit cfb mode is being used.
  15  * The extra state information to record how much of the 128bit block we have
  16  * used is contained in *num;
  17  */
  18
  19 void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out,
  20                         size_t length, const AES_KEY *key,
  21                         unsigned char *ivec, int *num, const int enc)
  22 {
  23
  24     CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc,
  25                           (block128_f) AES_encrypt);
  26 }
  27
  28 /* N.B. This expects the input to be packed, MS bit first */
  29 void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out,
  30                       size_t length, const AES_KEY *key,
  31                       unsigned char *ivec, int *num, const int enc)
  32 {
  33     CRYPTO_cfb128_1_encrypt(in, out, length, key, ivec, num, enc,
  34                             (block128_f) AES_encrypt);
  35 }
  36
  37 void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
  38                       size_t length, const AES_KEY *key,
  39                       unsigned char *ivec, int *num, const int enc)
  40 {
  41     CRYPTO_cfb128_8_encrypt(in, out, length, key, ivec, num, enc,
  42                             (block128_f) AES_encrypt);
  43 }