openssl/crypto/aes/aes_cbc.c

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#include <openssl/aes.h>
#include <openssl/modes.h>

void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
                     size_t len, const AES_KEY *key,
                     unsigned char *ivec, const int enc)
{

    if (enc)
        CRYPTO_cbc128_encrypt(in, out, len, key, ivec,
                              (block128_f) AES_encrypt);
    else
        CRYPTO_cbc128_decrypt(in, out, len, key, ivec,
                              (block128_f) AES_decrypt);
}