CRYPTO_ofb128_encrypt
CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num,
CRYPTO_ofb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num,
void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,