/// <summary>Verifies a message signed with the Sign method.</summary>
/// <param name="message">The message.</param>
/// <param name="signature">The 32 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 Verify(byte[] message, byte[] signature, byte[] key)
{
//validate the length of the key
if (key == null || key.Length != KEY_BYTES)
{
throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length,
string.Format("key must be {0} bytes in length.", KEY_BYTES));
}
//validate the length of the signature
if (signature == null || signature.Length != BYTES)
{
throw new SignatureOutOfRangeException("signature", (signature == null) ? 0 : signature.Length,
string.Format("signature must be {0} bytes in length.", BYTES));
}
var ret = SodiumLibrary.crypto_auth_verify(signature, message, message.Length, key);
return(ret == 0);
}