} // DecryptArray
/*
* private static bool DONT_USE_AESEncDecArray(bool bEncryptorDecrypt, ref byte[] aData, byte[] aAESKey, byte[] aIV = null)
* {
* bool bRet = true;
* try
* {
* if ( (aData == null)
|| ((bEncryptorDecrypt == true) && (aData.Length == 0))
|| ((bEncryptorDecrypt == false) && (aData.Length <= 16)) //Must be longer than the IV, when decrypting
|| (aAESKey.Length != 32)
|| ((aIV != null) && (aIV.Length != 16)))
|| return false;
||
|| // Instantiate a new Aes object to perform string symmetric encryption
||
|| using (Rijndael AES = RijndaelManaged.Create()) //Not FIPS compliant. :(
|| //using (Aes AES = Aes.Create()) //Issues! Not compatible with AES CPP implementation
|| {
|| //Construct the IV
|| bool bIVWasNull = (aIV == null);
|| if (bIVWasNull)
|| aIV = new byte[16];
||
|| if (bEncryptorDecrypt)
|| {
|| if (bIVWasNull)
|| aIV.FillRandom(); //when encrypting: new IV
|| }
|| else
|| Array.Copy(aData, aData.Length - 16, aIV, 0, 16); //when decrypting: use the IV thats the last 16 bytes of the data.
||
|| // Set mode, padding, key and IV
|| AES.Mode = CipherMode.CFB;
|| AES.Padding = PaddingMode.None;
|| AES.Key = aAESKey;
|| AES.IV = aIV;
|| AES.BlockSize = 128; //16 bytes
||
|| // Instantiate a new MemoryStream object to contain the encrypted bytes
|| MemoryStream ms = new MemoryStream();
|| //Dispose not required on MemoryStream, but gives a compiler warning/error when in a 'using' as CryptoStream below disposes of it as well.
|| //using (MemoryStream ms = new MemoryStream())
|| {
|| // Instantiate a new encryptor/decryptor from our Aes object
|| using (ICryptoTransform aesCryptor = bEncryptorDecrypt ? AES.CreateEncryptor() : AES.CreateDecryptor())
|| {
|| // Instantiate a new CryptoStream object to process the data and write it to the memory stream
|| using (CryptoStream cs = new CryptoStream(ms, aesCryptor, CryptoStreamMode.Write))
|| {
|| // Encrypt/decrypt the input
|| int iCount = bEncryptorDecrypt ? aData.Length : aData.Length - 16;
|| cs.Write(aData, 0, iCount); //-16, ignore the IV
||
|| //Add padding
|| int iPadded = -1;
|| {
|| //Padding.. .Why do we have to do this!
|| int iBlockSizeInBytes = AES.BlockSize / 8; //Bits to bytes.
||
|| int iCompleteBlock = iBlockSizeInBytes - (iCount % iBlockSizeInBytes);
|| if (iCompleteBlock < iBlockSizeInBytes)
|| {
|| iPadded = iCompleteBlock;
|| byte[] aZero = new byte[iPadded];
|| cs.Write(aZero, 0, iPadded); //-16, ignore the IV
|| }
||
|| }
||
|| // Complete the encrypt/decrypt process
|| cs.FlushFinalBlock();
||
|| //Remove Padding
|| if (iPadded > 0)
|| {
||
|| long iLen = ms.Length;
|| if (iLen > iPadded)
|| ms.SetLength(iLen - iPadded);
|| }
||
|| if (bEncryptorDecrypt)
|| ms.Write(aIV, 0, aIV.Length);
||
|| // Convert the encrypted/decrypted data from a MemoryStream to a byte array
|| aData = ms.ToArray();
|| }
|| }
|| }
|| }
|| }
|| catch (Exception e) { bRet = false; e.CatchMessage().TraceError("EncDecArray(): "); }
|| return bRet;
||} // DONT_USE_AESEncDecArray
*/
private static bool AESEncDecArray(bool bEncryptorDecrypt, ref byte[] aData, byte[] aAESKey, byte[] aIV = null)
{
bool bRet = true;
try
{
if ((aData == null) ||
((bEncryptorDecrypt == true) && (aData.Length == 0)) ||
((bEncryptorDecrypt == false) && (aData.Length <= 16)) || //Must be longer than the IV, when decrypting
(aAESKey.Length != 32) ||
((aIV != null) && (aIV.Length != 16)))
{
return(false);
}
//Construct the IV
bool bIVWasNull = (aIV == null);
if (bIVWasNull)
{
aIV = new byte[16];
}
int iDataLength = 0;
if (bEncryptorDecrypt)
{
iDataLength = aData.Length;
if (bIVWasNull)
{
aIV.FillRandom(); //when encrypting: new IV
}
}
else
{
Array.Copy(aData, aData.Length - 16, aIV, 0, 16); //when decrypting: use the IV thats the last 16 bytes of the data.
iDataLength = aData.Length - 16;
}
CfbBlockCipher cfb = new CfbBlockCipher(new AesEngine(), 128);
cfb.Init(bEncryptorDecrypt, new ParametersWithIV(new KeyParameter(aAESKey), aIV));
int iBlockSize = cfb.GetBlockSize();
for (int i = 0; i < iDataLength; i += iBlockSize)
{
int iRet = 0;
int iRemaining = iDataLength - i;
if (iRemaining < iBlockSize)
{
//Last partial block
byte[] aIn = new byte[iBlockSize];
byte[] aOut = new byte[iBlockSize];
Array.Copy(aData, i, aIn, 0, iRemaining);
if (bEncryptorDecrypt)
{
iRet = cfb.EncryptBlock(aIn, 0, aOut, 0);
}
else
{
iRet = cfb.DecryptBlock(aIn, 0, aOut, 0);
}
Array.Copy(aOut, 0, aData, i, iRemaining);
continue;
}
if (bEncryptorDecrypt)
{
iRet = cfb.EncryptBlock(aData, i, aData, i);
}
else
{
iRet = cfb.DecryptBlock(aData, i, aData, i);
}
}
if (bEncryptorDecrypt)
{
//Append IV.
Array.Resize(ref aData, iDataLength + 16);
Array.Copy(aIV, 0, aData, iDataLength, 16);
}
else
{
//Remove IV
Array.Resize(ref aData, iDataLength);
}
}
catch (Exception e) { bRet = false; e.CatchMessage().TraceError("AESEncDecArray(): "); }
return(bRet);
} // AESEncDecArray
public static IBufferedCipher GetCipher(
string algorithm)
{
if (algorithm == null)
{
throw new ArgumentNullException("algorithm");
}
algorithm = algorithm.ToUpper(CultureInfo.InvariantCulture);
string aliased = (string)algorithms[algorithm];
if (aliased != null)
{
algorithm = aliased;
}
IBasicAgreement iesAgreement = null;
if (algorithm == "IES")
{
iesAgreement = new DHBasicAgreement();
}
else if (algorithm == "ECIES")
{
iesAgreement = new ECDHBasicAgreement();
}
if (iesAgreement != null)
{
return(new BufferedIesCipher(
new IesEngine(
iesAgreement,
new Kdf2BytesGenerator(
new Sha1Digest()),
new HMac(
new Sha1Digest()))));
}
if (algorithm.StartsWith("PBE"))
{
if (algorithm.EndsWith("-CBC"))
{
if (algorithm == "PBEWITHSHA1ANDDES-CBC")
{
return(new PaddedBufferedBlockCipher(
new CbcBlockCipher(new DesEngine())));
}
else if (algorithm == "PBEWITHSHA1ANDRC2-CBC")
{
return(new PaddedBufferedBlockCipher(
new CbcBlockCipher(new RC2Engine())));
}
else if (Strings.IsOneOf(algorithm,
"PBEWITHSHAAND2-KEYTRIPLEDES-CBC", "PBEWITHSHAAND3-KEYTRIPLEDES-CBC"))
{
return(new PaddedBufferedBlockCipher(
new CbcBlockCipher(new DesEdeEngine())));
}
else if (Strings.IsOneOf(algorithm,
"PBEWITHSHAAND128BITRC2-CBC", "PBEWITHSHAAND40BITRC2-CBC"))
{
return(new PaddedBufferedBlockCipher(
new CbcBlockCipher(new RC2Engine())));
}
}
else if (algorithm.EndsWith("-BC") || algorithm.EndsWith("-OPENSSL"))
{
if (Strings.IsOneOf(algorithm,
"PBEWITHSHAAND128BITAES-CBC-BC",
"PBEWITHSHAAND192BITAES-CBC-BC",
"PBEWITHSHAAND256BITAES-CBC-BC",
"PBEWITHSHA256AND128BITAES-CBC-BC",
"PBEWITHSHA256AND192BITAES-CBC-BC",
"PBEWITHSHA256AND256BITAES-CBC-BC",
"PBEWITHMD5AND128BITAES-CBC-OPENSSL",
"PBEWITHMD5AND192BITAES-CBC-OPENSSL",
"PBEWITHMD5AND256BITAES-CBC-OPENSSL"))
{
return(new PaddedBufferedBlockCipher(
new CbcBlockCipher(new AesFastEngine())));
}
}
}
string[] parts = algorithm.Split('/');
IBlockCipher blockCipher = null;
IAsymmetricBlockCipher asymBlockCipher = null;
IStreamCipher streamCipher = null;
string algorithmName = parts[0];
CipherAlgorithm cipherAlgorithm;
try
{
cipherAlgorithm = (CipherAlgorithm)Enums.GetEnumValue(typeof(CipherAlgorithm), algorithmName);
}
catch (ArgumentException)
{
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
switch (cipherAlgorithm)
{
case CipherAlgorithm.AES:
blockCipher = new AesFastEngine();
break;
case CipherAlgorithm.ARC4:
streamCipher = new RC4Engine();
break;
case CipherAlgorithm.BLOWFISH:
blockCipher = new BlowfishEngine();
break;
case CipherAlgorithm.CAMELLIA:
blockCipher = new CamelliaEngine();
break;
case CipherAlgorithm.CAST5:
blockCipher = new Cast5Engine();
break;
case CipherAlgorithm.CAST6:
blockCipher = new Cast6Engine();
break;
case CipherAlgorithm.DES:
blockCipher = new DesEngine();
break;
case CipherAlgorithm.DESEDE:
blockCipher = new DesEdeEngine();
break;
case CipherAlgorithm.ELGAMAL:
asymBlockCipher = new ElGamalEngine();
break;
case CipherAlgorithm.GOST28147:
blockCipher = new Gost28147Engine();
break;
case CipherAlgorithm.HC128:
streamCipher = new HC128Engine();
break;
case CipherAlgorithm.HC256:
streamCipher = new HC256Engine();
break;
#if INCLUDE_IDEA
case CipherAlgorithm.IDEA:
blockCipher = new IdeaEngine();
break;
#endif
case CipherAlgorithm.NOEKEON:
blockCipher = new NoekeonEngine();
break;
case CipherAlgorithm.PBEWITHSHAAND128BITRC4:
case CipherAlgorithm.PBEWITHSHAAND40BITRC4:
streamCipher = new RC4Engine();
break;
case CipherAlgorithm.RC2:
blockCipher = new RC2Engine();
break;
case CipherAlgorithm.RC5:
blockCipher = new RC532Engine();
break;
case CipherAlgorithm.RC5_64:
blockCipher = new RC564Engine();
break;
case CipherAlgorithm.RC6:
blockCipher = new RC6Engine();
break;
case CipherAlgorithm.RIJNDAEL:
blockCipher = new RijndaelEngine();
break;
case CipherAlgorithm.RSA:
asymBlockCipher = new RsaBlindedEngine();
break;
case CipherAlgorithm.SALSA20:
streamCipher = new Salsa20Engine();
break;
case CipherAlgorithm.SEED:
blockCipher = new SeedEngine();
break;
case CipherAlgorithm.SERPENT:
blockCipher = new SerpentEngine();
break;
case CipherAlgorithm.SKIPJACK:
blockCipher = new SkipjackEngine();
break;
case CipherAlgorithm.TEA:
blockCipher = new TeaEngine();
break;
case CipherAlgorithm.TWOFISH:
blockCipher = new TwofishEngine();
break;
case CipherAlgorithm.VMPC:
streamCipher = new VmpcEngine();
break;
case CipherAlgorithm.VMPC_KSA3:
streamCipher = new VmpcKsa3Engine();
break;
case CipherAlgorithm.XTEA:
blockCipher = new XteaEngine();
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
if (streamCipher != null)
{
if (parts.Length > 1)
{
throw new ArgumentException("Modes and paddings not used for stream ciphers");
}
return(new BufferedStreamCipher(streamCipher));
}
bool cts = false;
bool padded = true;
IBlockCipherPadding padding = null;
IAeadBlockCipher aeadBlockCipher = null;
if (parts.Length > 2)
{
if (streamCipher != null)
{
throw new ArgumentException("Paddings not used for stream ciphers");
}
string paddingName = parts[2];
CipherPadding cipherPadding;
if (paddingName == "")
{
cipherPadding = CipherPadding.RAW;
}
else if (paddingName == "X9.23PADDING")
{
cipherPadding = CipherPadding.X923PADDING;
}
else
{
try
{
cipherPadding = (CipherPadding)Enums.GetEnumValue(typeof(CipherPadding), paddingName);
}
catch (ArgumentException)
{
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
switch (cipherPadding)
{
case CipherPadding.NOPADDING:
padded = false;
break;
case CipherPadding.RAW:
break;
case CipherPadding.ISO10126PADDING:
case CipherPadding.ISO10126D2PADDING:
case CipherPadding.ISO10126_2PADDING:
padding = new ISO10126d2Padding();
break;
case CipherPadding.ISO7816_4PADDING:
case CipherPadding.ISO9797_1PADDING:
padding = new ISO7816d4Padding();
break;
case CipherPadding.ISO9796_1:
case CipherPadding.ISO9796_1PADDING:
asymBlockCipher = new ISO9796d1Encoding(asymBlockCipher);
break;
case CipherPadding.OAEP:
case CipherPadding.OAEPPADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher);
break;
case CipherPadding.OAEPWITHMD5ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new MD5Digest());
break;
case CipherPadding.OAEPWITHSHA1ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_1ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha1Digest());
break;
case CipherPadding.OAEPWITHSHA224ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_224ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha224Digest());
break;
case CipherPadding.OAEPWITHSHA256ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_256ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha256Digest());
break;
case CipherPadding.OAEPWITHSHA384ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_384ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha384Digest());
break;
case CipherPadding.OAEPWITHSHA512ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_512ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha512Digest());
break;
case CipherPadding.PKCS1:
case CipherPadding.PKCS1PADDING:
asymBlockCipher = new Pkcs1Encoding(asymBlockCipher);
break;
case CipherPadding.PKCS5:
case CipherPadding.PKCS5PADDING:
case CipherPadding.PKCS7:
case CipherPadding.PKCS7PADDING:
padding = new Pkcs7Padding();
break;
case CipherPadding.TBCPADDING:
padding = new TbcPadding();
break;
case CipherPadding.WITHCTS:
cts = true;
break;
case CipherPadding.X923PADDING:
padding = new X923Padding();
break;
case CipherPadding.ZEROBYTEPADDING:
padding = new ZeroBytePadding();
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
string mode = "";
if (parts.Length > 1)
{
mode = parts[1];
int di = GetDigitIndex(mode);
string modeName = di >= 0 ? mode.Substring(0, di) : mode;
try
{
CipherMode cipherMode = modeName == ""
? CipherMode.NONE
: (CipherMode)Enums.GetEnumValue(typeof(CipherMode), modeName);
switch (cipherMode)
{
case CipherMode.ECB:
case CipherMode.NONE:
break;
case CipherMode.CBC:
blockCipher = new CbcBlockCipher(blockCipher);
break;
case CipherMode.CCM:
aeadBlockCipher = new CcmBlockCipher(blockCipher);
break;
case CipherMode.CFB:
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new CfbBlockCipher(blockCipher, bits);
break;
}
case CipherMode.CFBDCP:
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new CfbDCPCipher(blockCipher, bits);
break;
}
case CipherMode.CTR:
blockCipher = new SicBlockCipher(blockCipher);
break;
case CipherMode.CTS:
cts = true;
blockCipher = new CbcBlockCipher(blockCipher);
break;
case CipherMode.EAX:
aeadBlockCipher = new EaxBlockCipher(blockCipher);
break;
case CipherMode.GCM:
aeadBlockCipher = new GcmBlockCipher(blockCipher);
break;
case CipherMode.GOFB:
blockCipher = new GOfbBlockCipher(blockCipher);
break;
case CipherMode.OFB:
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new OfbBlockCipher(blockCipher, bits);
break;
}
case CipherMode.OPENPGPCFB:
blockCipher = new OpenPgpCfbBlockCipher(blockCipher);
break;
case CipherMode.SIC:
if (blockCipher.GetBlockSize() < 16)
{
throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)");
}
blockCipher = new SicBlockCipher(blockCipher);
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
catch (ArgumentException)
{
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
if (aeadBlockCipher != null)
{
if (cts)
{
throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers.");
}
if (padded && parts.Length > 2 && parts[2] != "")
{
throw new SecurityUtilityException("Bad padding specified for AEAD cipher.");
}
return(new BufferedAeadBlockCipher(aeadBlockCipher));
}
if (blockCipher != null)
{
if (cts)
{
return(new CtsBlockCipher(blockCipher));
}
if (padding != null)
{
return(new PaddedBufferedBlockCipher(blockCipher, padding));
}
if (!padded || blockCipher.IsPartialBlockOkay)
{
return(new BufferedBlockCipher(blockCipher));
}
return(new PaddedBufferedBlockCipher(blockCipher));
}
if (asymBlockCipher != null)
{
return(new BufferedAsymmetricBlockCipher(asymBlockCipher));
}
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
