Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / CryptoHelper.cs / 1305376 / CryptoHelper.cs
//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------
namespace System.IdentityModel
{
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IdentityModel.Tokens;
using System.IO;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Threading;
static class CryptoHelper
{
static byte[] emptyBuffer;
static RandomNumberGenerator random;
static Rijndael rijndael;
static TripleDES tripleDES;
static Dictionary> algorithmDelegateDictionary = new Dictionary>();
static object AlgorithmDictionaryLock = new object();
internal static byte[] EmptyBuffer
{
get
{
if (emptyBuffer == null)
{
byte[] tmp = new byte[0];
emptyBuffer = tmp;
}
return emptyBuffer;
}
}
internal static Rijndael Rijndael
{
get
{
if (rijndael == null)
{
Rijndael tmp = SecurityUtils.RequiresFipsCompliance ? (Rijndael)new RijndaelCryptoServiceProvider() : new RijndaelManaged(); ;
tmp.Padding = PaddingMode.ISO10126;
rijndael = tmp;
}
return rijndael;
}
}
internal static TripleDES TripleDES
{
get
{
if (tripleDES == null)
{
TripleDESCryptoServiceProvider tmp = new TripleDESCryptoServiceProvider();
tmp.Padding = PaddingMode.ISO10126;
tripleDES = tmp;
}
return tripleDES;
}
}
internal static RandomNumberGenerator RandomNumberGenerator
{
get
{
if (random == null)
{
random = new RNGCryptoServiceProvider();
}
return random;
}
}
internal static HashAlgorithm NewSha1HashAlgorithm()
{
return CryptoHelper.CreateHashAlgorithm(SecurityAlgorithms.Sha1Digest);
}
internal static HashAlgorithm NewSha256HashAlgorithm()
{
return CryptoHelper.CreateHashAlgorithm(SecurityAlgorithms.Sha256Digest);
}
internal static KeyedHashAlgorithm NewHmacSha1KeyedHashAlgorithm(byte[] key)
{
return CryptoHelper.CreateKeyedHashAlgorithm(key, SecurityAlgorithms.HmacSha1Signature);
}
internal static KeyedHashAlgorithm NewHmacSha256KeyedHashAlgorithm(byte[] key)
{
return CryptoHelper.CreateKeyedHashAlgorithm(key, SecurityAlgorithms.HmacSha256Signature);
}
internal static Rijndael NewRijndaelSymmetricAlgorithm()
{
Rijndael rijndael = (GetSymmetricAlgorithm(null, SecurityAlgorithms.Aes128Encryption) as Rijndael);
if (rijndael != null)
return rijndael;
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidSymmetricAlgorithm, SecurityAlgorithms.Aes128Encryption)));
}
internal static ICryptoTransform CreateDecryptor(byte[] key, byte[] iv, string algorithm)
{
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
SymmetricAlgorithm symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
if (symmetricAlgorithm != null)
{
return symmetricAlgorithm.CreateDecryptor(key, iv);
}
//NOTE: KeyedHashAlgorithms are symmetric in nature but we still throw if it is passed as an argument.
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidSymmetricAlgorithm, algorithm)));
}
switch (algorithm)
{
case SecurityAlgorithms.TripleDesEncryption:
return TripleDES.CreateDecryptor(key, iv);
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.Aes256Encryption:
return Rijndael.CreateDecryptor(key, iv);
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedEncryptionAlgorithm, algorithm)));
}
}
internal static ICryptoTransform CreateEncryptor(byte[] key, byte[] iv, string algorithm)
{
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
SymmetricAlgorithm symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
if (symmetricAlgorithm != null)
{
return symmetricAlgorithm.CreateEncryptor(key, iv);
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidSymmetricAlgorithm, algorithm)));
}
switch (algorithm)
{
case SecurityAlgorithms.TripleDesEncryption:
return TripleDES.CreateEncryptor(key, iv);
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.Aes256Encryption:
return Rijndael.CreateEncryptor(key, iv);
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedEncryptionAlgorithm, algorithm)));
}
}
internal static HashAlgorithm CreateHashAlgorithm(string algorithm)
{
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
HashAlgorithm hashAlgorithm = algorithmObject as HashAlgorithm;
if (hashAlgorithm != null)
{
return hashAlgorithm;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidHashAlgorithm, algorithm)));
}
switch (algorithm)
{
case SecurityAlgorithms.Sha1Digest:
if (SecurityUtils.RequiresFipsCompliance)
return new SHA1CryptoServiceProvider();
else
return new SHA1Managed();
case SecurityAlgorithms.Sha256Digest:
if (SecurityUtils.RequiresFipsCompliance)
return new SHA256CryptoServiceProvider();
else
return new SHA256Managed();
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedCryptoAlgorithm, algorithm)));
}
}
internal static KeyedHashAlgorithm CreateKeyedHashAlgorithm(byte[] key, string algorithm)
{
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
KeyedHashAlgorithm keyedHashAlgorithm = algorithmObject as KeyedHashAlgorithm;
if (keyedHashAlgorithm != null)
{
keyedHashAlgorithm.Key = key;
return keyedHashAlgorithm;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidKeyedHashAlgorithm, algorithm)));
}
switch (algorithm)
{
case SecurityAlgorithms.HmacSha1Signature:
return new HMACSHA1(key, !SecurityUtils.RequiresFipsCompliance);
case SecurityAlgorithms.HmacSha256Signature:
if (!SecurityUtils.RequiresFipsCompliance)
return new HMACSHA256(key);
else
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CryptoAlgorithmIsNotFipsCompliant, algorithm)));
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedCryptoAlgorithm, algorithm)));
}
}
internal static byte[] ComputeHash(byte[] buffer)
{
using (HashAlgorithm hasher = CryptoHelper.NewSha1HashAlgorithm())
{
return hasher.ComputeHash(buffer);
}
}
internal static byte[] GenerateDerivedKey(byte[] key, string algorithm, byte[] label, byte[] nonce, int derivedKeySize, int position)
{
if ((algorithm != SecurityAlgorithms.Psha1KeyDerivation) && (algorithm != SecurityAlgorithms.Psha1KeyDerivationDec2005))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedKeyDerivationAlgorithm, algorithm)));
}
return new Psha1DerivedKeyGenerator(key).GenerateDerivedKey(label, nonce, derivedKeySize, position);
}
internal static int GetIVSize(string algorithm)
{
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
SymmetricAlgorithm symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
if (symmetricAlgorithm != null)
{
return symmetricAlgorithm.BlockSize;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidSymmetricAlgorithm, algorithm)));
}
switch (algorithm)
{
case SecurityAlgorithms.TripleDesEncryption:
return TripleDES.BlockSize;
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.Aes256Encryption:
return Rijndael.BlockSize;
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedEncryptionAlgorithm, algorithm)));
}
}
internal static SymmetricAlgorithm GetSymmetricAlgorithm(byte[] key, string algorithm)
{
SymmetricAlgorithm symmetricAlgorithm;
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
if (symmetricAlgorithm != null)
{
if (key != null)
{
symmetricAlgorithm.Key = key;
}
return symmetricAlgorithm;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.CustomCryptoAlgorithmIsNotValidSymmetricAlgorithm, algorithm)));
}
// NOTE: HMACSHA1 and HMACSHA256 ( KeyedHashAlgorithms ) are symmetric algorithms but they do not extend Symmetric class.
// Hence the function throws when they are passed as arguments.
switch (algorithm)
{
case SecurityAlgorithms.TripleDesEncryption:
case SecurityAlgorithms.TripleDesKeyWrap:
symmetricAlgorithm = new TripleDESCryptoServiceProvider();
break;
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.Aes256Encryption:
case SecurityAlgorithms.Aes128KeyWrap:
case SecurityAlgorithms.Aes192KeyWrap:
case SecurityAlgorithms.Aes256KeyWrap:
symmetricAlgorithm = SecurityUtils.RequiresFipsCompliance ? (Rijndael)new RijndaelCryptoServiceProvider() : new RijndaelManaged();
break;
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedEncryptionAlgorithm, algorithm)));
}
if (key != null)
{
symmetricAlgorithm.Key = key;
}
return symmetricAlgorithm;
}
internal static bool IsAsymmetricAlgorithm(string algorithm)
{
object algorithmObject = null;
try
{
algorithmObject = GetAlgorithmFromConfig(algorithm);
}
catch (InvalidOperationException)
{
algorithmObject = null;
// We ---- the exception and continue.
}
if (algorithmObject != null)
{
AsymmetricAlgorithm asymmetricAlgorithm = algorithmObject as AsymmetricAlgorithm;
SignatureDescription signatureDescription = algorithmObject as SignatureDescription;
if (asymmetricAlgorithm != null || signatureDescription != null)
return true;
return false;
}
switch (algorithm)
{
case SecurityAlgorithms.DsaSha1Signature:
case SecurityAlgorithms.RsaSha1Signature:
case SecurityAlgorithms.RsaSha256Signature:
case SecurityAlgorithms.RsaOaepKeyWrap:
case SecurityAlgorithms.RsaV15KeyWrap:
return true;
default:
return false;
}
}
internal static bool IsSymmetricAlgorithm(string algorithm)
{
object algorithmObject = null;
try
{
algorithmObject = GetAlgorithmFromConfig(algorithm);
}
catch (InvalidOperationException)
{
algorithmObject = null;
// We ---- the exception and continue.
}
if (algorithmObject != null)
{
SymmetricAlgorithm symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
KeyedHashAlgorithm keyedHashAlgorithm = algorithmObject as KeyedHashAlgorithm;
if (symmetricAlgorithm != null || keyedHashAlgorithm != null)
return true;
return false;
}
// NOTE: A KeyedHashAlgorithm is symmetric in nature.
switch (algorithm)
{
case SecurityAlgorithms.DsaSha1Signature:
case SecurityAlgorithms.RsaSha1Signature:
case SecurityAlgorithms.RsaSha256Signature:
case SecurityAlgorithms.RsaOaepKeyWrap:
case SecurityAlgorithms.RsaV15KeyWrap:
return false;
case SecurityAlgorithms.HmacSha1Signature:
case SecurityAlgorithms.HmacSha256Signature:
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.DesEncryption:
case SecurityAlgorithms.Aes256Encryption:
case SecurityAlgorithms.TripleDesEncryption:
case SecurityAlgorithms.Aes128KeyWrap:
case SecurityAlgorithms.Aes192KeyWrap:
case SecurityAlgorithms.Aes256KeyWrap:
case SecurityAlgorithms.TripleDesKeyWrap:
case SecurityAlgorithms.Psha1KeyDerivation:
case SecurityAlgorithms.Psha1KeyDerivationDec2005:
return true;
default:
return false;
}
}
internal static bool IsSymmetricSupportedAlgorithm(string algorithm, int keySize)
{
bool found = false;
object algorithmObject = null;
try
{
algorithmObject = GetAlgorithmFromConfig(algorithm);
}
catch (InvalidOperationException)
{
// We ---- the exception and continue.
}
if (algorithmObject != null)
{
SymmetricAlgorithm symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
KeyedHashAlgorithm keyedHashAlgorithm = algorithmObject as KeyedHashAlgorithm;
if (symmetricAlgorithm != null || keyedHashAlgorithm != null)
found = true;
// The reason we do not return here even when the user has provided a custom algorithm in machine.config
// is because we need to check if the user has overwritten an existing standard URI.
}
switch (algorithm)
{
case SecurityAlgorithms.DsaSha1Signature:
case SecurityAlgorithms.RsaSha1Signature:
case SecurityAlgorithms.RsaSha256Signature:
case SecurityAlgorithms.RsaOaepKeyWrap:
case SecurityAlgorithms.RsaV15KeyWrap:
return false;
case SecurityAlgorithms.HmacSha1Signature:
case SecurityAlgorithms.HmacSha256Signature:
case SecurityAlgorithms.Psha1KeyDerivation:
case SecurityAlgorithms.Psha1KeyDerivationDec2005:
return true;
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes128KeyWrap:
return keySize >= 128 && keySize <= 256;
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.Aes192KeyWrap:
return keySize >= 192 && keySize <= 256;
case SecurityAlgorithms.Aes256Encryption:
case SecurityAlgorithms.Aes256KeyWrap:
return keySize == 256;
case SecurityAlgorithms.TripleDesEncryption:
case SecurityAlgorithms.TripleDesKeyWrap:
return keySize == 128 || keySize == 192;
default:
if (found)
return true;
return false;
// We do not expect the user to map the uri of an existing standrad algorithm with say key size 128 bit
// to a custom algorithm with keySize 192 bits. If he does that, we anyways make sure that we return false.
}
}
// We currently call the CLR APIs to do symmetric key wrap.
// This ends up causing a triple cloning of the byte arrays.
// However, the symmetric key wrap exists now primarily for
// the feature completeness of cryptos and tokens. That is,
// it is never encountered in any Indigo AuthenticationMode.
// The performance of this should be reviewed if this gets hit
// in any mainline scenario.
internal static byte[] UnwrapKey(byte[] wrappingKey, byte[] wrappedKey, string algorithm)
{
SymmetricAlgorithm symmetricAlgorithm;
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
if (symmetricAlgorithm == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.InvalidCustomKeyWrapAlgorithm, algorithm)));
}
using (symmetricAlgorithm)
{
symmetricAlgorithm.Key = wrappingKey;
return EncryptedXml.DecryptKey(wrappedKey, symmetricAlgorithm);
}
}
switch (algorithm)
{
case SecurityAlgorithms.TripleDesKeyWrap:
symmetricAlgorithm = new TripleDESCryptoServiceProvider();
break;
case SecurityAlgorithms.Aes128KeyWrap:
case SecurityAlgorithms.Aes192KeyWrap:
case SecurityAlgorithms.Aes256KeyWrap:
symmetricAlgorithm = SecurityUtils.RequiresFipsCompliance ? (Rijndael)new RijndaelCryptoServiceProvider() : new RijndaelManaged();
break;
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedKeyWrapAlgorithm, algorithm)));
}
using (symmetricAlgorithm)
{
symmetricAlgorithm.Key = wrappingKey;
return EncryptedXml.DecryptKey(wrappedKey, symmetricAlgorithm);
}
}
internal static byte[] WrapKey(byte[] wrappingKey, byte[] keyToBeWrapped, string algorithm)
{
SymmetricAlgorithm symmetricAlgorithm;
object algorithmObject = GetAlgorithmFromConfig(algorithm);
if (algorithmObject != null)
{
symmetricAlgorithm = algorithmObject as SymmetricAlgorithm;
if (symmetricAlgorithm == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.InvalidCustomKeyWrapAlgorithm, algorithm)));
}
using (symmetricAlgorithm)
{
symmetricAlgorithm.Key = wrappingKey;
return EncryptedXml.EncryptKey(keyToBeWrapped, symmetricAlgorithm);
}
}
switch (algorithm)
{
case SecurityAlgorithms.TripleDesKeyWrap:
symmetricAlgorithm = new TripleDESCryptoServiceProvider();
break;
case SecurityAlgorithms.Aes128KeyWrap:
case SecurityAlgorithms.Aes192KeyWrap:
case SecurityAlgorithms.Aes256KeyWrap:
symmetricAlgorithm = SecurityUtils.RequiresFipsCompliance ? (Rijndael)new RijndaelCryptoServiceProvider() : new RijndaelManaged();
break;
default:
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnsupportedKeyWrapAlgorithm, algorithm)));
}
using (symmetricAlgorithm)
{
symmetricAlgorithm.Key = wrappingKey;
return EncryptedXml.EncryptKey(keyToBeWrapped, symmetricAlgorithm);
}
}
internal static void ValidateBufferBounds(Array buffer, int offset, int count)
{
if (buffer == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("buffer"));
}
if (count < 0 || count > buffer.Length)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("count", SR.GetString(SR.ValueMustBeInRange, 0, buffer.Length)));
}
if (offset < 0 || offset > buffer.Length - count)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.ValueMustBeInRange, 0, buffer.Length - count)));
}
}
internal static bool IsEqual(byte[] a, byte[] b)
{
if (ReferenceEquals(a, b))
{
return true;
}
if (a == null || b == null || a.Length != b.Length)
{
return false;
}
for (int i = 0; i < a.Length; i++)
{
if (a[i] != b[i])
{
return false;
}
}
return true;
}
private static object GetDefaultAlgorithm(string algorithm)
{
if (string.IsNullOrEmpty(algorithm))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("algorithm"));
}
switch (algorithm)
{
//case SecurityAlgorithms.RsaSha1Signature:
//case SecurityAlgorithms.DsaSha1Signature:
// For these algorithms above, crypto config returns internal objects.
// As we cannot create those internal objects, we are returning null.
// If no custom algorithm is plugged-in, at least these two algorithms
// will be inside the delegate dictionary.
case SecurityAlgorithms.Sha1Digest:
if (SecurityUtils.RequiresFipsCompliance)
return new SHA1CryptoServiceProvider();
else
return new SHA1Managed();
case SecurityAlgorithms.ExclusiveC14n:
return new XmlDsigExcC14NTransform();
case SecurityAlgorithms.Sha256Digest:
if (SecurityUtils.RequiresFipsCompliance)
return new SHA256CryptoServiceProvider();
else
return new SHA256Managed();
case SecurityAlgorithms.Sha512Digest:
if (SecurityUtils.RequiresFipsCompliance)
return new SHA512CryptoServiceProvider();
else
return new SHA512Managed();
case SecurityAlgorithms.Aes128Encryption:
case SecurityAlgorithms.Aes192Encryption:
case SecurityAlgorithms.Aes256Encryption:
case SecurityAlgorithms.Aes128KeyWrap:
case SecurityAlgorithms.Aes192KeyWrap:
case SecurityAlgorithms.Aes256KeyWrap:
if (SecurityUtils.RequiresFipsCompliance)
return new RijndaelCryptoServiceProvider();
else
return new RijndaelManaged();
case SecurityAlgorithms.TripleDesEncryption:
case SecurityAlgorithms.TripleDesKeyWrap:
return new TripleDESCryptoServiceProvider();
case SecurityAlgorithms.HmacSha1Signature:
byte[] key = new byte[64];
new RNGCryptoServiceProvider().GetBytes(key);
return new HMACSHA1(key, !SecurityUtils.RequiresFipsCompliance);
case SecurityAlgorithms.HmacSha256Signature:
if (!SecurityUtils.RequiresFipsCompliance)
return new HMACSHA256();
return null;
case SecurityAlgorithms.ExclusiveC14nWithComments:
return new XmlDsigExcC14NWithCommentsTransform();
case SecurityAlgorithms.Ripemd160Digest:
if (!SecurityUtils.RequiresFipsCompliance)
return new RIPEMD160Managed();
return null;
case SecurityAlgorithms.DesEncryption:
return new DESCryptoServiceProvider();
default:
return null;
}
}
internal static object GetAlgorithmFromConfig(string algorithm)
{
if (string.IsNullOrEmpty(algorithm))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("algorithm"));
}
object algorithmObject = null;
object defaultObject = null;
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