/// <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.Basic128:
case SecurityPolicies.Basic192:
case SecurityPolicies.Basic256:
{
if (dataToDecrypt.Algorithm == SecurityAlgorithms.RsaOaep)
{
return RsaUtils.Decrypt(new ArraySegment<byte>(dataToDecrypt.Data), certificate, true);
}
break;
}
case SecurityPolicies.Basic128Rsa15:
case SecurityPolicies.Basic192Rsa15:
case SecurityPolicies.Basic256Rsa15:
{
if (dataToDecrypt.Algorithm == SecurityAlgorithms.Rsa15)
{
return RsaUtils.Decrypt(new ArraySegment<byte>(dataToDecrypt.Data), certificate, false);
}
break;
}
case SecurityPolicies.None:
{
if (String.IsNullOrEmpty(dataToDecrypt.Algorithm))
{
return dataToDecrypt.Data;
}
break;
}
default:
{
throw new ApplicationException(String.Format(
"Unsupported security policy: {0}",
securityPolicyUri));
}
}
throw new ApplicationException(String.Format(
"Unexpected encryption algorithm : {0}",
dataToDecrypt.Data));
}
/// <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.Basic128:
case SecurityPolicies.Basic192:
case SecurityPolicies.Basic256:
{
encryptedData.Algorithm = SecurityAlgorithms.RsaOaep;
encryptedData.Data = RsaUtils.Encrypt(plainText, certificate, true);
break;
}
case SecurityPolicies.Basic128Rsa15:
case SecurityPolicies.Basic192Rsa15:
case SecurityPolicies.Basic256Rsa15:
{
encryptedData.Algorithm = SecurityAlgorithms.Rsa15;
encryptedData.Data = RsaUtils.Encrypt(plainText, certificate, false);
break;
}
case SecurityPolicies.None:
{
break;
}
default:
{
throw new ApplicationException(String.Format(
"Unsupported security policy: {0}",
securityPolicyUri));
}
}
return encryptedData;
}
