/// <summary>
/// Signs the data using the SecurityPolicyUri and returns the signature.
/// </summary>
public static SignatureData Sign(X509Certificate2 certificate, string securityPolicyUri, byte[] dataToSign)
{
SignatureData signatureData = new SignatureData();
// check if nothing to do.
if (dataToSign == null)
{
return(signatureData);
}
// nothing more to do if no encryption.
if (String.IsNullOrEmpty(securityPolicyUri))
{
return(signatureData);
}
// sign data.
switch (securityPolicyUri)
{
case SecurityPolicies.Basic256:
case SecurityPolicies.Basic128Rsa15:
{
signatureData.Algorithm = SecurityAlgorithms.RsaSha1;
signatureData.Signature = RsaUtils.RsaPkcs15Sha1_Sign(new ArraySegment <byte>(dataToSign), certificate);
break;
}
case SecurityPolicies.None:
{
signatureData.Algorithm = null;
signatureData.Signature = null;
break;
}
default:
{
throw ServiceResultException.Create(
StatusCodes.BadSecurityPolicyRejected,
"Unsupported security policy: {0}",
securityPolicyUri);
}
}
return(signatureData);
}
/// <summary>
/// Decrypts the data using RSA encryption.
/// </summary>
internal static byte[] Decrypt(
ArraySegment <byte> dataToDecrypt,
X509Certificate2 encryptingCertificate,
Padding padding)
{
RSA rsa = null;
try
{
rsa = encryptingCertificate.GetRSAPrivateKey();
if (rsa == null)
{
throw ServiceResultException.Create(StatusCodes.BadSecurityChecksFailed, "No private key for certificate.");
}
int plainTextSize = dataToDecrypt.Count / GetCipherTextBlockSize(rsa, padding);
plainTextSize *= GetPlainTextBlockSize(encryptingCertificate, padding);
byte[] buffer = new byte[plainTextSize];
ArraySegment <byte> plainText = Decrypt(dataToDecrypt, rsa, padding, new ArraySegment <byte>(buffer));
System.Diagnostics.Debug.Assert(plainText.Count == buffer.Length);
// decode length.
int length = 0;
length += (((int)plainText.Array[plainText.Offset + 0]));
length += (((int)plainText.Array[plainText.Offset + 1]) << 8);
length += (((int)plainText.Array[plainText.Offset + 2]) << 16);
length += (((int)plainText.Array[plainText.Offset + 3]) << 24);
if (length > (plainText.Count - plainText.Offset - 4))
{
throw ServiceResultException.Create(StatusCodes.BadEndOfStream, "Could not decrypt data. Invalid total length.");
}
byte[] decryptedData = new byte[length];
Array.Copy(plainText.Array, plainText.Offset + 4, decryptedData, 0, length);
return(decryptedData);
}
finally
{
RsaUtils.RSADispose(rsa);
}
}
/// <summary>
/// Returns the length of a RSA PKCS#1 v1.5 signature of a digest.
/// </summary>
internal static int GetSignatureLength(X509Certificate2 signingCertificate)
{
RSA rsa = null;
try
{
rsa = signingCertificate.GetRSAPublicKey();
if (rsa == null)
{
throw ServiceResultException.Create(StatusCodes.BadSecurityChecksFailed, "No public key for certificate.");
}
return(rsa.KeySize / 8);
}
finally
{
RsaUtils.RSADispose(rsa);
}
}
/// <summary>
/// Encrypts the data using RSA encryption.
/// </summary>
internal static byte[] Encrypt(
byte[] dataToEncrypt,
X509Certificate2 encryptingCertificate,
Padding padding)
{
RSA rsa = null;
try
{
rsa = encryptingCertificate.GetRSAPublicKey();
if (rsa == null)
{
throw ServiceResultException.Create(StatusCodes.BadSecurityChecksFailed, "No public key for certificate.");
}
int plaintextBlockSize = GetPlainTextBlockSize(rsa, padding);
int blockCount = ((dataToEncrypt.Length + 4) / plaintextBlockSize) + 1;
int plainTextSize = blockCount * plaintextBlockSize;
int cipherTextSize = blockCount * GetCipherTextBlockSize(rsa, padding);
byte[] plainText = new byte[plainTextSize];
// encode length.
plainText[0] = (byte)((0x000000FF & dataToEncrypt.Length));
plainText[1] = (byte)((0x0000FF00 & dataToEncrypt.Length) >> 8);
plainText[2] = (byte)((0x00FF0000 & dataToEncrypt.Length) >> 16);
plainText[3] = (byte)((0xFF000000 & dataToEncrypt.Length) >> 24);
// copy data.
Array.Copy(dataToEncrypt, 0, plainText, 4, dataToEncrypt.Length);
byte[] buffer = new byte[cipherTextSize];
ArraySegment <byte> cipherText = Encrypt(new ArraySegment <byte>(plainText), rsa, padding, new ArraySegment <byte>(buffer));
System.Diagnostics.Debug.Assert(cipherText.Count == buffer.Length);
return(buffer);
}
finally
{
RsaUtils.RSADispose(rsa);
}
}
/// <summary>
/// Computes an RSA/SHA256 PKCS#1 v1.5 signature.
/// </summary>
public static byte[] RsaPkcs15Sha256_Sign(
ArraySegment <byte> dataToSign,
X509Certificate2 signingCertificate)
{
RSA rsa = null;
try
{
// extract the private key.
rsa = signingCertificate.GetRSAPrivateKey();
if (rsa == null)
{
throw ServiceResultException.Create(StatusCodes.BadSecurityChecksFailed, "No private key for certificate.");
}
// create the signature.
return(rsa.SignData(dataToSign.Array, dataToSign.Offset, dataToSign.Count, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1));
}
finally
{
RsaUtils.RSADispose(rsa);
}
}
/// <summary>
/// Verifies an RSA/SHA1 PKCS#1 v1.5 signature.
/// </summary>
public static bool RsaPkcs15Sha1_Verify(
ArraySegment <byte> dataToVerify,
byte[] signature,
X509Certificate2 signingCertificate)
{
RSA rsa = null;
try
{
// extract the public key.
rsa = signingCertificate.GetRSAPublicKey();
if (rsa == null)
{
throw ServiceResultException.Create(StatusCodes.BadSecurityChecksFailed, "No public key for certificate.");
}
// verify signature.
return(rsa.VerifyData(dataToVerify.Array, dataToVerify.Offset, dataToVerify.Count, signature, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1));
}
finally
{
RsaUtils.RSADispose(rsa);
}
}
/// <summary>
/// Verifies the signature using the SecurityPolicyUri and return true if valid.
/// </summary>
public static bool Verify(X509Certificate2 certificate, string securityPolicyUri, byte[] dataToVerify, SignatureData signature)
{
// check if nothing to do.
if (signature == null)
{
return(true);
}
// nothing more to do if no encryption.
if (String.IsNullOrEmpty(securityPolicyUri))
{
return(true);
}
// decrypt data.
switch (securityPolicyUri)
{
case SecurityPolicies.Basic256:
case SecurityPolicies.Basic128Rsa15:
{
if (signature.Algorithm == SecurityAlgorithms.RsaSha1)
{
return(RsaUtils.Rsa_Verify(new ArraySegment <byte>(dataToVerify), signature.Signature, certificate, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1));
}
throw ServiceResultException.Create(
StatusCodes.BadSecurityChecksFailed,
"Unexpected signature algorithm for Basic256/Basic128Rsa15: {0}\n" +
"Expected signature algorithm: {1}",
signature.Algorithm,
SecurityAlgorithms.RsaSha1);
}
case SecurityPolicies.Aes128_Sha256_RsaOaep:
case SecurityPolicies.Basic256Sha256:
{
if (signature.Algorithm == SecurityAlgorithms.RsaSha256)
{
return(RsaUtils.Rsa_Verify(new ArraySegment <byte>(dataToVerify), signature.Signature, certificate, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1));
}
throw ServiceResultException.Create(
StatusCodes.BadSecurityChecksFailed,
"Unexpected signature algorithm for Basic256Sha256/Aes128_Sha256_RsaOaep: {0}\n" +
"Expected signature algorithm: {1}",
signature.Algorithm,
SecurityAlgorithms.RsaSha256);
}
case SecurityPolicies.Aes256_Sha256_RsaPss:
{
if (signature.Algorithm == SecurityAlgorithms.RsaPssSha256)
{
return(RsaUtils.Rsa_Verify(new ArraySegment <byte>(dataToVerify), signature.Signature, certificate, HashAlgorithmName.SHA256, RSASignaturePadding.Pss));
}
throw ServiceResultException.Create(
StatusCodes.BadSecurityChecksFailed,
"Unexpected signature algorithm for Aes256_Sha256_RsaPss: {0}\n" +
"Expected signature algorithm : {1}",
signature.Algorithm,
SecurityAlgorithms.RsaPssSha256);
}
// always accept signatures if security is not used.
case SecurityPolicies.None:
{
return(true);
}
default:
{
throw ServiceResultException.Create(
StatusCodes.BadSecurityPolicyRejected,
"Unsupported security policy: {0}",
securityPolicyUri);
}
}
throw ServiceResultException.Create(
StatusCodes.BadSecurityChecksFailed,
"Unexpected security policy Uri: {0}",
securityPolicyUri);
}
/// <summary>
/// Decrypts the CipherText using the SecurityPolicyUri and returns the PlainTetx.
/// </summary>
public static byte[] Decrypt(X509Certificate2 certificate, string securityPolicyUri, EncryptedData dataToDecrypt)
{
// check if nothing to do.
if (dataToDecrypt == null)
{
return(null);
}
// nothing more to do if no encryption.
if (String.IsNullOrEmpty(securityPolicyUri))
{
return(dataToDecrypt.Data);
}
// decrypt data.
switch (securityPolicyUri)
{
case SecurityPolicies.Basic256:
case SecurityPolicies.Basic256Sha256:
case SecurityPolicies.Aes128_Sha256_RsaOaep:
{
if (dataToDecrypt.Algorithm == SecurityAlgorithms.RsaOaep)
{
return(RsaUtils.Decrypt(new ArraySegment <byte>(dataToDecrypt.Data), certificate, RsaUtils.Padding.OaepSHA1));
}
break;
}
case SecurityPolicies.Basic128Rsa15:
{
if (dataToDecrypt.Algorithm == SecurityAlgorithms.Rsa15)
{
return(RsaUtils.Decrypt(new ArraySegment <byte>(dataToDecrypt.Data), certificate, RsaUtils.Padding.Pkcs1));
}
break;
}
case SecurityPolicies.Aes256_Sha256_RsaPss:
{
if (dataToDecrypt.Algorithm == SecurityAlgorithms.RsaOaepSha256)
{
return(RsaUtils.Decrypt(new ArraySegment <byte>(dataToDecrypt.Data), certificate, RsaUtils.Padding.OaepSHA256));
}
break;
}
case SecurityPolicies.None:
{
if (String.IsNullOrEmpty(dataToDecrypt.Algorithm))
{
return(dataToDecrypt.Data);
}
break;
}
default:
{
throw ServiceResultException.Create(
StatusCodes.BadSecurityPolicyRejected,
"Unsupported security policy: {0}",
securityPolicyUri);
}
}
throw ServiceResultException.Create(
StatusCodes.BadIdentityTokenInvalid,
"Unexpected encryption algorithm : {0}",
dataToDecrypt.Algorithm);
}
/// <summary>
/// Encrypts the text using the SecurityPolicyUri and returns the result.
/// </summary>
public static EncryptedData Encrypt(X509Certificate2 certificate, string securityPolicyUri, byte[] plainText)
{
EncryptedData encryptedData = new EncryptedData();
encryptedData.Algorithm = null;
encryptedData.Data = plainText;
// check if nothing to do.
if (plainText == null)
{
return(encryptedData);
}
// nothing more to do if no encryption.
if (String.IsNullOrEmpty(securityPolicyUri))
{
return(encryptedData);
}
// encrypt data.
switch (securityPolicyUri)
{
case SecurityPolicies.Basic256:
case SecurityPolicies.Basic256Sha256:
case SecurityPolicies.Aes128_Sha256_RsaOaep:
{
encryptedData.Algorithm = SecurityAlgorithms.RsaOaep;
encryptedData.Data = RsaUtils.Encrypt(plainText, certificate, RsaUtils.Padding.OaepSHA1);
break;
}
case SecurityPolicies.Basic128Rsa15:
{
encryptedData.Algorithm = SecurityAlgorithms.Rsa15;
encryptedData.Data = RsaUtils.Encrypt(plainText, certificate, RsaUtils.Padding.Pkcs1);
break;
}
case SecurityPolicies.Aes256_Sha256_RsaPss:
{
encryptedData.Algorithm = SecurityAlgorithms.RsaOaepSha256;
encryptedData.Data = RsaUtils.Encrypt(plainText, certificate, RsaUtils.Padding.OaepSHA256);
break;
}
case SecurityPolicies.None:
{
break;
}
default:
{
throw ServiceResultException.Create(
StatusCodes.BadSecurityPolicyRejected,
"Unsupported security policy: {0}",
securityPolicyUri);
}
}
return(encryptedData);
}
/// <summary>
/// Loads the private key from a PFX file in the certificate store.
/// </summary>
public X509Certificate2 LoadPrivateKey(string thumbprint, string subjectName, string password)
{
if (m_certificateSubdir == null || !m_certificateSubdir.Exists)
{
return(null);
}
if (string.IsNullOrEmpty(thumbprint) && string.IsNullOrEmpty(subjectName))
{
return(null);
}
foreach (FileInfo file in m_certificateSubdir.GetFiles("*.der"))
{
try
{
X509Certificate2 certificate = new X509Certificate2(file.FullName);
if (!String.IsNullOrEmpty(thumbprint))
{
if (!string.Equals(certificate.Thumbprint, thumbprint, StringComparison.CurrentCultureIgnoreCase))
{
continue;
}
}
if (!String.IsNullOrEmpty(subjectName))
{
if (!Utils.CompareDistinguishedName(subjectName, certificate.Subject))
{
if (subjectName.Contains("=") || !certificate.Subject.Contains("CN=" + subjectName))
{
continue;
}
}
}
string fileRoot = file.Name.Substring(0, file.Name.Length - file.Extension.Length);
StringBuilder filePath = new StringBuilder();
filePath.Append(m_privateKeySubdir.FullName);
filePath.Append(Path.DirectorySeparatorChar);
filePath.Append(fileRoot);
FileInfo privateKeyFile = new FileInfo(filePath.ToString() + ".pfx");
RSA rsa = null;
try
{
certificate = new X509Certificate2(
privateKeyFile.FullName,
(password == null) ? String.Empty : password,
X509KeyStorageFlags.Exportable | X509KeyStorageFlags.UserKeySet);
rsa = certificate.GetRSAPrivateKey();
}
catch (Exception)
{
certificate = new X509Certificate2(
privateKeyFile.FullName,
(password == null) ? String.Empty : password,
X509KeyStorageFlags.Exportable | X509KeyStorageFlags.MachineKeySet);
rsa = certificate.GetRSAPrivateKey();
}
if (rsa != null)
{
int inputBlockSize = RsaUtils.GetPlainTextBlockSize(rsa, true);
byte[] bytes1 = rsa.Encrypt(new byte[inputBlockSize], RSAEncryptionPadding.OaepSHA1);
byte[] bytes2 = rsa.Decrypt(bytes1, RSAEncryptionPadding.OaepSHA1);
if (bytes2 != null)
{
// Utils.Trace(1, "RSA: {0}", certificate.Thumbprint);
return(certificate);
}
}
}
catch (Exception e)
{
Utils.Trace(e, "Could not load private key for certificate " + subjectName);
}
}
return(null);
}
