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using System;
using System.Collections;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.CryptoPro;
using Org.BouncyCastle.Asn1.Kisa;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Ntt;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Agreement;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Crypto.Encodings;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Macs;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Paddings;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Security
{
/// <remarks>
/// Cipher Utility class contains methods that can not be specifically grouped into other classes.
/// </remarks>
public sealed class CipherUtilities
{
private enum CipherAlgorithm {
AES,
ARC4,
BLOWFISH,
CAMELLIA,
CAST5,
CAST6,
DES,
DESEDE,
ELGAMAL,
GOST28147,
HC128,
HC256,
IDEA,
NOEKEON,
PBEWITHSHAAND128BITRC4,
PBEWITHSHAAND40BITRC4,
RC2,
RC5,
RC5_64,
RC6,
RIJNDAEL,
RSA,
SALSA20,
SEED,
SERPENT,
SKIPJACK,
TEA,
THREEFISH_256,
THREEFISH_512,
THREEFISH_1024,
TNEPRES,
TWOFISH,
VMPC,
VMPC_KSA3,
XTEA,
};
private enum CipherMode { ECB, NONE, CBC, CCM, CFB, CTR, CTS, EAX, GCM, GOFB, OCB, OFB, OPENPGPCFB, SIC };
private enum CipherPadding
{
NOPADDING,
RAW,
ISO10126PADDING,
ISO10126D2PADDING,
ISO10126_2PADDING,
ISO7816_4PADDING,
ISO9797_1PADDING,
ISO9796_1,
ISO9796_1PADDING,
OAEP,
OAEPPADDING,
OAEPWITHMD5ANDMGF1PADDING,
OAEPWITHSHA1ANDMGF1PADDING,
OAEPWITHSHA_1ANDMGF1PADDING,
OAEPWITHSHA224ANDMGF1PADDING,
OAEPWITHSHA_224ANDMGF1PADDING,
OAEPWITHSHA256ANDMGF1PADDING,
OAEPWITHSHA_256ANDMGF1PADDING,
OAEPWITHSHA384ANDMGF1PADDING,
OAEPWITHSHA_384ANDMGF1PADDING,
OAEPWITHSHA512ANDMGF1PADDING,
OAEPWITHSHA_512ANDMGF1PADDING,
PKCS1,
PKCS1PADDING,
PKCS5,
PKCS5PADDING,
PKCS7,
PKCS7PADDING,
TBCPADDING,
WITHCTS,
X923PADDING,
ZEROBYTEPADDING,
};
private static readonly IDictionary algorithms = Platform.CreateHashtable();
private static readonly IDictionary oids = Platform.CreateHashtable();
static CipherUtilities()
{
// Signal to obfuscation tools not to change enum constants
((CipherAlgorithm)Enums.GetArbitraryValue(typeof(CipherAlgorithm))).ToString();
((CipherMode)Enums.GetArbitraryValue(typeof(CipherMode))).ToString();
((CipherPadding)Enums.GetArbitraryValue(typeof(CipherPadding))).ToString();
// TODO Flesh out the list of aliases
algorithms[NistObjectIdentifiers.IdAes128Ecb.Id] = "AES/ECB/PKCS7PADDING";
algorithms[NistObjectIdentifiers.IdAes192Ecb.Id] = "AES/ECB/PKCS7PADDING";
algorithms[NistObjectIdentifiers.IdAes256Ecb.Id] = "AES/ECB/PKCS7PADDING";
algorithms["AES//PKCS7"] = "AES/ECB/PKCS7PADDING";
algorithms["AES//PKCS7PADDING"] = "AES/ECB/PKCS7PADDING";
algorithms["AES//PKCS5"] = "AES/ECB/PKCS7PADDING";
algorithms["AES//PKCS5PADDING"] = "AES/ECB/PKCS7PADDING";
algorithms[NistObjectIdentifiers.IdAes128Cbc.Id] = "AES/CBC/PKCS7PADDING";
algorithms[NistObjectIdentifiers.IdAes192Cbc.Id] = "AES/CBC/PKCS7PADDING";
algorithms[NistObjectIdentifiers.IdAes256Cbc.Id] = "AES/CBC/PKCS7PADDING";
algorithms[NistObjectIdentifiers.IdAes128Ofb.Id] = "AES/OFB/NOPADDING";
algorithms[NistObjectIdentifiers.IdAes192Ofb.Id] = "AES/OFB/NOPADDING";
algorithms[NistObjectIdentifiers.IdAes256Ofb.Id] = "AES/OFB/NOPADDING";
algorithms[NistObjectIdentifiers.IdAes128Cfb.Id] = "AES/CFB/NOPADDING";
algorithms[NistObjectIdentifiers.IdAes192Cfb.Id] = "AES/CFB/NOPADDING";
algorithms[NistObjectIdentifiers.IdAes256Cfb.Id] = "AES/CFB/NOPADDING";
algorithms["RSA/ECB/PKCS1"] = "RSA//PKCS1PADDING";
algorithms["RSA/ECB/PKCS1PADDING"] = "RSA//PKCS1PADDING";
algorithms[PkcsObjectIdentifiers.RsaEncryption.Id] = "RSA//PKCS1PADDING";
algorithms[PkcsObjectIdentifiers.IdRsaesOaep.Id] = "RSA//OAEPPADDING";
algorithms[OiwObjectIdentifiers.DesCbc.Id] = "DES/CBC";
algorithms[OiwObjectIdentifiers.DesCfb.Id] = "DES/CFB";
algorithms[OiwObjectIdentifiers.DesEcb.Id] = "DES/ECB";
algorithms[OiwObjectIdentifiers.DesOfb.Id] = "DES/OFB";
algorithms[OiwObjectIdentifiers.DesEde.Id] = "DESEDE";
algorithms["TDEA"] = "DESEDE";
algorithms[PkcsObjectIdentifiers.DesEde3Cbc.Id] = "DESEDE/CBC";
algorithms[PkcsObjectIdentifiers.RC2Cbc.Id] = "RC2/CBC";
algorithms["1.3.6.1.4.1.188.7.1.1.2"] = "IDEA/CBC";
algorithms["1.2.840.113533.7.66.10"] = "CAST5/CBC";
algorithms["RC4"] = "ARC4";
algorithms["ARCFOUR"] = "ARC4";
algorithms["1.2.840.113549.3.4"] = "ARC4";
algorithms["PBEWITHSHA1AND128BITRC4"] = "PBEWITHSHAAND128BITRC4";
algorithms[PkcsObjectIdentifiers.PbeWithShaAnd128BitRC4.Id] = "PBEWITHSHAAND128BITRC4";
algorithms["PBEWITHSHA1AND40BITRC4"] = "PBEWITHSHAAND40BITRC4";
algorithms[PkcsObjectIdentifiers.PbeWithShaAnd40BitRC4.Id] = "PBEWITHSHAAND40BITRC4";
algorithms["PBEWITHSHA1ANDDES"] = "PBEWITHSHA1ANDDES-CBC";
algorithms[PkcsObjectIdentifiers.PbeWithSha1AndDesCbc.Id] = "PBEWITHSHA1ANDDES-CBC";
algorithms["PBEWITHSHA1ANDRC2"] = "PBEWITHSHA1ANDRC2-CBC";
algorithms[PkcsObjectIdentifiers.PbeWithSha1AndRC2Cbc.Id] = "PBEWITHSHA1ANDRC2-CBC";
algorithms["PBEWITHSHA1AND3-KEYTRIPLEDES-CBC"] = "PBEWITHSHAAND3-KEYTRIPLEDES-CBC";
algorithms["PBEWITHSHAAND3KEYTRIPLEDES"] = "PBEWITHSHAAND3-KEYTRIPLEDES-CBC";
algorithms[PkcsObjectIdentifiers.PbeWithShaAnd3KeyTripleDesCbc.Id] = "PBEWITHSHAAND3-KEYTRIPLEDES-CBC";
algorithms["PBEWITHSHA1ANDDESEDE"] = "PBEWITHSHAAND3-KEYTRIPLEDES-CBC";
algorithms["PBEWITHSHA1AND2-KEYTRIPLEDES-CBC"] = "PBEWITHSHAAND2-KEYTRIPLEDES-CBC";
algorithms[PkcsObjectIdentifiers.PbeWithShaAnd2KeyTripleDesCbc.Id] = "PBEWITHSHAAND2-KEYTRIPLEDES-CBC";
algorithms["PBEWITHSHA1AND128BITRC2-CBC"] = "PBEWITHSHAAND128BITRC2-CBC";
algorithms[PkcsObjectIdentifiers.PbeWithShaAnd128BitRC2Cbc.Id] = "PBEWITHSHAAND128BITRC2-CBC";
algorithms["PBEWITHSHA1AND40BITRC2-CBC"] = "PBEWITHSHAAND40BITRC2-CBC";
algorithms[PkcsObjectIdentifiers.PbewithShaAnd40BitRC2Cbc.Id] = "PBEWITHSHAAND40BITRC2-CBC";
algorithms["PBEWITHSHA1AND128BITAES-CBC-BC"] = "PBEWITHSHAAND128BITAES-CBC-BC";
algorithms["PBEWITHSHA-1AND128BITAES-CBC-BC"] = "PBEWITHSHAAND128BITAES-CBC-BC";
algorithms["PBEWITHSHA1AND192BITAES-CBC-BC"] = "PBEWITHSHAAND192BITAES-CBC-BC";
algorithms["PBEWITHSHA-1AND192BITAES-CBC-BC"] = "PBEWITHSHAAND192BITAES-CBC-BC";
algorithms["PBEWITHSHA1AND256BITAES-CBC-BC"] = "PBEWITHSHAAND256BITAES-CBC-BC";
algorithms["PBEWITHSHA-1AND256BITAES-CBC-BC"] = "PBEWITHSHAAND256BITAES-CBC-BC";
algorithms["PBEWITHSHA-256AND128BITAES-CBC-BC"] = "PBEWITHSHA256AND128BITAES-CBC-BC";
algorithms["PBEWITHSHA-256AND192BITAES-CBC-BC"] = "PBEWITHSHA256AND192BITAES-CBC-BC";
algorithms["PBEWITHSHA-256AND256BITAES-CBC-BC"] = "PBEWITHSHA256AND256BITAES-CBC-BC";
algorithms["GOST"] = "GOST28147";
algorithms["GOST-28147"] = "GOST28147";
algorithms[CryptoProObjectIdentifiers.GostR28147Cbc.Id] = "GOST28147/CBC/PKCS7PADDING";
algorithms["RC5-32"] = "RC5";
algorithms[NttObjectIdentifiers.IdCamellia128Cbc.Id] = "CAMELLIA/CBC/PKCS7PADDING";
algorithms[NttObjectIdentifiers.IdCamellia192Cbc.Id] = "CAMELLIA/CBC/PKCS7PADDING";
algorithms[NttObjectIdentifiers.IdCamellia256Cbc.Id] = "CAMELLIA/CBC/PKCS7PADDING";
algorithms[KisaObjectIdentifiers.IdSeedCbc.Id] = "SEED/CBC/PKCS7PADDING";
algorithms["1.3.6.1.4.1.3029.1.2"] = "BLOWFISH/CBC";
}
private CipherUtilities()
{
}
/// <summary>
/// Returns a ObjectIdentifier for a give encoding.
/// </summary>
/// <param name="mechanism">A string representation of the encoding.</param>
/// <returns>A DerObjectIdentifier, null if the Oid is not available.</returns>
// TODO Don't really want to support this
public static DerObjectIdentifier GetObjectIdentifier(
string mechanism)
{
if (mechanism == null)
throw new ArgumentNullException("mechanism");
mechanism = Platform.ToUpperInvariant(mechanism);
string aliased = (string) algorithms[mechanism];
if (aliased != null)
mechanism = aliased;
return (DerObjectIdentifier) oids[mechanism];
}
public static ICollection Algorithms
{
get { return oids.Keys; }
}
public static IBufferedCipher GetCipher(
DerObjectIdentifier oid)
{
return GetCipher(oid.Id);
}
public static IBufferedCipher GetCipher(
string algorithm)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
algorithm = Platform.ToUpperInvariant(algorithm);
{
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 (Platform.StartsWith(algorithm, "PBE"))
{
if (Platform.EndsWith(algorithm, "-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 (Platform.EndsWith(algorithm, "-BC") || Platform.EndsWith(algorithm, "-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 AesEngine()));
}
}
}
string[] parts = algorithm.Split('/');
IBlockCipher blockCipher = null;
IAsymmetricBlockCipher asymBlockCipher = null;
IStreamCipher streamCipher = null;
string algorithmName = parts[0];
{
string aliased = (string)algorithms[algorithmName];
if (aliased != null)
algorithmName = aliased;
}
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 AesEngine();
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;
case CipherAlgorithm.IDEA:
blockCipher = new IdeaEngine();
break;
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.THREEFISH_256:
blockCipher = new ThreefishEngine(ThreefishEngine.BLOCKSIZE_256);
break;
case CipherAlgorithm.THREEFISH_512:
blockCipher = new ThreefishEngine(ThreefishEngine.BLOCKSIZE_512);
break;
case CipherAlgorithm.THREEFISH_1024:
blockCipher = new ThreefishEngine(ThreefishEngine.BLOCKSIZE_1024);
break;
case CipherAlgorithm.TNEPRES:
blockCipher = new TnepresEngine();
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.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.OCB:
aeadBlockCipher = new OcbBlockCipher(blockCipher, CreateBlockCipher(cipherAlgorithm));
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.");
}
public static string GetAlgorithmName(
DerObjectIdentifier oid)
{
return (string) algorithms[oid.Id];
}
private static int GetDigitIndex(
string s)
{
for (int i = 0; i < s.Length; ++i)
{
if (char.IsDigit(s[i]))
return i;
}
return -1;
}
private static IBlockCipher CreateBlockCipher(CipherAlgorithm cipherAlgorithm)
{
switch (cipherAlgorithm)
{
case CipherAlgorithm.AES: return new AesEngine();
case CipherAlgorithm.BLOWFISH: return new BlowfishEngine();
case CipherAlgorithm.CAMELLIA: return new CamelliaEngine();
case CipherAlgorithm.CAST5: return new Cast5Engine();
case CipherAlgorithm.CAST6: return new Cast6Engine();
case CipherAlgorithm.DES: return new DesEngine();
case CipherAlgorithm.DESEDE: return new DesEdeEngine();
case CipherAlgorithm.GOST28147: return new Gost28147Engine();
case CipherAlgorithm.IDEA: return new IdeaEngine();
case CipherAlgorithm.NOEKEON: return new NoekeonEngine();
case CipherAlgorithm.RC2: return new RC2Engine();
case CipherAlgorithm.RC5: return new RC532Engine();
case CipherAlgorithm.RC5_64: return new RC564Engine();
case CipherAlgorithm.RC6: return new RC6Engine();
case CipherAlgorithm.RIJNDAEL: return new RijndaelEngine();
case CipherAlgorithm.SEED: return new SeedEngine();
case CipherAlgorithm.SERPENT: return new SerpentEngine();
case CipherAlgorithm.SKIPJACK: return new SkipjackEngine();
case CipherAlgorithm.TEA: return new TeaEngine();
case CipherAlgorithm.THREEFISH_256: return new ThreefishEngine(ThreefishEngine.BLOCKSIZE_256);
case CipherAlgorithm.THREEFISH_512: return new ThreefishEngine(ThreefishEngine.BLOCKSIZE_512);
case CipherAlgorithm.THREEFISH_1024: return new ThreefishEngine(ThreefishEngine.BLOCKSIZE_1024);
case CipherAlgorithm.TNEPRES: return new TnepresEngine();
case CipherAlgorithm.TWOFISH: return new TwofishEngine();
case CipherAlgorithm.XTEA: return new XteaEngine();
default:
throw new SecurityUtilityException("Cipher " + cipherAlgorithm + " not recognised or not a block cipher");
}
}
}
}