void ComputeSignature(HashAlgorithm hash, AsymmetricSignatureFormatter formatter, string signatureMethod) { this.Signature.SignedInfo.ComputeReferenceDigests(); this.Signature.SignedInfo.ComputeHash(hash); byte[] signature; if (SecurityUtils.RequiresFipsCompliance && signatureMethod == SecurityAlgorithms.RsaSha256Signature) { // This is to avoid the RSAPKCS1SignatureFormatter.CreateSignature from using SHA256Managed (non-FIPS-Compliant). // Hence we precompute the hash using SHA256CSP (FIPS compliant) and pass it to method. // NOTE: RSAPKCS1SignatureFormatter does not understand SHA256CSP inherently and hence this workaround. formatter.SetHashAlgorithm("SHA256"); signature = formatter.CreateSignature(hash.Hash); } else { signature = formatter.CreateSignature(hash); } this.Signature.SetSignatureValue(signature); }
/// <summary> /// Wrapper that creates a signature for SHA256 taking into consideration the special logic required for FIPS compliance /// </summary> /// <param name="formatter">the signature formatter</param> /// <param name="hash">the hash algorithm</param> /// <returns>byte array representing the signature</returns> internal static byte[] CreateSignatureForSha256( AsymmetricSignatureFormatter formatter, HashAlgorithm hash ) { if ( SecurityUtils.RequiresFipsCompliance ) { // // When FIPS is turned ON. We need to set the hash algorithm specifically // as we need to pass the pre-computed buffer to CreateSignature, else // for SHA256 and FIPS turned ON, the underlying formatter does not understand the // OID for the hashing algorithm. // formatter.SetHashAlgorithm( "SHA256" ); return formatter.CreateSignature( hash.Hash ); } else { // // Calling the formatter with the object allows us to be Crypto-Agile // return formatter.CreateSignature( hash ); } }
public FaultingAsymmetricSecurityKey(AsymmetricSecurityKey key = null, AsymmetricAlgorithm agorithm = null, AsymmetricSignatureDeformatter deformatter = null, AsymmetricSignatureFormatter formatter = null, HashAlgorithm hash = null, bool hasPrivateKey = false) { Key = key; }
private void ComputeSignature(HashAlgorithm hash, AsymmetricSignatureFormatter formatter, string signatureMethod) { byte[] buffer; this.Signature.SignedInfo.ComputeReferenceDigests(); this.Signature.SignedInfo.ComputeHash(hash); if (System.IdentityModel.SecurityUtils.RequiresFipsCompliance && (signatureMethod == "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256")) { formatter.SetHashAlgorithm("SHA256"); buffer = formatter.CreateSignature(hash.Hash); } else { buffer = formatter.CreateSignature(hash); } this.Signature.SetSignatureValue(buffer); }
/// <summary> /// Initializes a new instance of the <see cref="AsymmetricSignatureProvider"/> class used to create and verify signatures. /// </summary> /// <param name="key"> /// The <see cref="AsymmetricSecurityKey"/> that will be used for cryptographic operations. /// </param> /// <param name="algorithm"> /// The signature algorithm to apply. /// </param> /// <param name="willCreateSignatures"> /// If this <see cref="AsymmetricSignatureProvider"/> is required to create signatures then set this to true. /// <para> /// Creating signatures requires that the <see cref="AsymmetricSecurityKey"/> has access to a private key. /// Verifying signatures (the default), does not require access to the private key. /// </para> /// </param> /// <exception cref="ArgumentNullException"> /// 'key' is null. /// </exception> /// <exception cref="ArgumentNullException"> /// 'algorithm' is null. /// </exception> /// <exception cref="ArgumentException"> /// 'algorithm' contains only whitespace. /// </exception> /// <exception cref="ArgumentOutOfRangeException"> /// willCreateSignatures is true and <see cref="AsymmetricSecurityKey"/>.KeySize is less than <see cref="SignatureProviderFactory.MinimumAsymmetricKeySizeInBitsForSigning"/>. /// </exception> /// <exception cref="ArgumentOutOfRangeException"> /// <see cref="AsymmetricSecurityKey"/>.KeySize is less than <see cref="SignatureProviderFactory.MinimumAsymmetricKeySizeInBitsForVerifying"/>. Note: this is always checked. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSecurityKey.GetHashAlgorithmForSignature"/> throws. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSecurityKey.GetHashAlgorithmForSignature"/> returns null. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSecurityKey.GetSignatureFormatter"/> throws. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSecurityKey.GetSignatureFormatter"/> returns null. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSecurityKey.GetSignatureDeformatter"/> throws. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSecurityKey.GetSignatureDeformatter"/> returns null. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSignatureFormatter.SetHashAlgorithm"/> throws. /// </exception> /// <exception cref="InvalidOperationException"> /// Is thrown if the <see cref="AsymmetricSignatureDeformatter.SetHashAlgorithm"/> throws. /// </exception> public AsymmetricSignatureProvider(AsymmetricSecurityKey key, string algorithm, bool willCreateSignatures = false) { if (key == null) { throw new ArgumentNullException("key"); } if (algorithm == null) { throw new ArgumentNullException("algorithm"); } if (string.IsNullOrWhiteSpace(algorithm)) { throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10002, "algorithm")); } if (willCreateSignatures) { if (key.KeySize < SignatureProviderFactory.MinimumAsymmetricKeySizeInBitsForSigning) { throw new ArgumentOutOfRangeException("key.KeySize", key.KeySize, string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10631, key.GetType(), SignatureProviderFactory.MinimumAsymmetricKeySizeInBitsForSigning)); } } if (key.KeySize < SignatureProviderFactory.MinimumAsymmetricKeySizeInBitsForVerifying) { throw new ArgumentOutOfRangeException("key.KeySize", key.KeySize, string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10630, key.GetType(), SignatureProviderFactory.MinimumAsymmetricKeySizeInBitsForVerifying)); } this.key = key; try { this.hash = this.key.GetHashAlgorithmForSignature(algorithm); } catch (Exception ex) { if (DiagnosticUtility.IsFatal(ex)) { throw; } throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10618, algorithm, this.key.ToString(), ex), ex); } if (this.hash == null) { throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10611, algorithm, this.key.ToString())); } if (willCreateSignatures) { try { this.formatter = this.key.GetSignatureFormatter(algorithm); this.formatter.SetHashAlgorithm(this.hash.GetType().ToString()); } catch (Exception ex) { if (DiagnosticUtility.IsFatal(ex)) { throw; } throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10614, algorithm, this.key.ToString(), ex), ex); } if (this.formatter == null) { throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10615, algorithm, this.key.ToString())); } } try { this.deformatter = this.key.GetSignatureDeformatter(algorithm); this.deformatter.SetHashAlgorithm(this.hash.GetType().ToString()); } catch (Exception ex) { if (DiagnosticUtility.IsFatal(ex)) { throw; } throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10616, algorithm, this.key.ToString(), ex), ex); } if (this.deformatter == null) { throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, ErrorMessages.IDX10617, algorithm, this.key.ToString())); } }
internal static void LogSigning(SignedXml signedXml, object key, SignatureDescription signatureDescription, HashAlgorithm hash, AsymmetricSignatureFormatter asymmetricSignatureFormatter) { if (InformationLoggingEnabled) { string data = string.Format(CultureInfo.InvariantCulture, SecurityResources.GetResourceString("Log_SigningAsymmetric"), new object[] { GetKeyName(key), signatureDescription.GetType().Name, hash.GetType().Name, asymmetricSignatureFormatter.GetType().Name }); WriteLine(signedXml, TraceEventType.Information, SignedXmlDebugEvent.Signing, data); } }