aes_cfb.c

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/* crypto/aes/aes_cfb.c -*- mode:C; c-file-style: "eay" -*- */
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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);
    }