BF_cbc_encrypt
BF_cbc_encrypt(buf, buf,
BF_cbc_encrypt(in, out, (long)chunk, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
BF_cbc_encrypt(in, out, (long)inl, &((EVP_BF_KEY *)ctx->cipher_data)->ks, ctx->iv, ctx->encrypt);
void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,