/// <summary>
/// Produces a signature over the 'input' using the <see cref="SecurityKey"/> and algorithm specified.
/// </summary>
/// <param name="inputString">string to be signed</param>
/// <param name="key">the <see cref="SecurityKey"/> to use.</param>
/// <param name="algorithm">the algorithm to use.</param>
/// <param name="signatureProvider">if provided, the <see cref="SignatureProvider"/> will be used to sign the token</param>
/// <returns>The signature over the bytes obtained from UTF8Encoding.GetBytes( 'input' ).</returns>
/// <remarks>The <see cref="SignatureProvider"/> used to created the signature is obtained by calling <see cref="System.IdentityModel.Tokens.SignatureProviderFactory.CreateForSigning(SecurityKey, string)"/>.</remarks>
/// <exception cref="ArgumentNullException">'input' is null.</exception>
/// <exception cref="InvalidProgramException"><see cref="System.IdentityModel.Tokens.SignatureProviderFactory.CreateForSigning(SecurityKey, string)"/> returns null.</exception>
internal byte[] CreateSignature(string inputString, SecurityKey key, string algorithm, SignatureProvider signatureProvider = null)
{
if (null == inputString)
{
throw new ArgumentNullException("inputString");
}
SignatureProvider provider;
if (signatureProvider != null)
{
return signatureProvider.Sign(Encoding.UTF8.GetBytes(inputString));
}
else
{
provider = SignatureProviderFactory.CreateForSigning(key, algorithm);
if (provider == null)
{
throw new InvalidProgramException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10635, SignatureProviderFactory.GetType(), typeof(SignatureProvider), key == null ? "<null>" : key.GetType().ToString(), algorithm == null ? "<null>" : algorithm));
}
byte[] bytes = provider.Sign(Encoding.UTF8.GetBytes(inputString));
SignatureProviderFactory.ReleaseProvider(provider);
return bytes;
}
}
private void SignatureProvider_SignVariation(SignatureProvider provider, byte[] bytes, byte[] signature, ExpectedException expectedException)
{
try
{
provider.Sign(bytes);
expectedException.ProcessNoException();
}
catch (Exception ex)
{
expectedException.ProcessException(ex);
}
}