crypto_rsa_exptmod() function

crypto_rsa_exptmod - RSA modular exponentiation @in: Input data @inlen: Input data length @out: Buffer for output data @outlen: Maximum size of the output buffer and used size on success @key: RSA key @use_private: 1 = Use RSA private key, 0 = Use RSA public key Returns: 0 on success, -1 on failure