Exemplo n.º 1
0
        /// <summary>Verifies a message signed with the SignHmacSha512 method.</summary>
        /// <param name="message">The message.</param>
        /// <param name="signature">The 64 byte signature.</param>
        /// <param name="key">The 32 byte key.</param>
        /// <returns>True if verified.</returns>
        /// <exception cref="KeyOutOfRangeException"></exception>
        /// <exception cref="SignatureOutOfRangeException"></exception>
        public static bool VerifyHmacSha512(byte[] message, byte[] signature, byte[] key)
        {
            //validate the length of the key
            if (key == null || key.Length != CRYPTO_AUTH_HMACSHA512_KEY_BYTES)
            {
                throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length,
                                                 string.Format("key must be {0} bytes in length.", CRYPTO_AUTH_HMACSHA512_KEY_BYTES));
            }

            //validate the length of the signature
            if (signature == null || signature.Length != CRYPTO_AUTH_HMACSHA512_BYTES)
            {
                throw new SignatureOutOfRangeException("signature", (signature == null) ? 0 : signature.Length,
                                                       string.Format("signature must be {0} bytes in length.", CRYPTO_AUTH_HMACSHA512_BYTES));
            }

            var ret = SodiumLibrary.crypto_auth_hmacsha512_verify(signature, message, message.Length, key);

            return(ret == 0);
        }