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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.Misc;
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.Parameters;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Security
{
public sealed class ParameterUtilities
{
private ParameterUtilities()
{
}
private static readonly IDictionary algorithms = Platform.CreateHashtable();
private static readonly IDictionary basicIVSizes = Platform.CreateHashtable();
static ParameterUtilities()
{
AddAlgorithm("AES",
"AESWRAP");
AddAlgorithm("AES128",
"2.16.840.1.101.3.4.2",
NistObjectIdentifiers.IdAes128Cbc,
NistObjectIdentifiers.IdAes128Cfb,
NistObjectIdentifiers.IdAes128Ecb,
NistObjectIdentifiers.IdAes128Ofb,
NistObjectIdentifiers.IdAes128Wrap);
AddAlgorithm("AES192",
"2.16.840.1.101.3.4.22",
NistObjectIdentifiers.IdAes192Cbc,
NistObjectIdentifiers.IdAes192Cfb,
NistObjectIdentifiers.IdAes192Ecb,
NistObjectIdentifiers.IdAes192Ofb,
NistObjectIdentifiers.IdAes192Wrap);
AddAlgorithm("AES256",
"2.16.840.1.101.3.4.42",
NistObjectIdentifiers.IdAes256Cbc,
NistObjectIdentifiers.IdAes256Cfb,
NistObjectIdentifiers.IdAes256Ecb,
NistObjectIdentifiers.IdAes256Ofb,
NistObjectIdentifiers.IdAes256Wrap);
AddAlgorithm("BLOWFISH",
"1.3.6.1.4.1.3029.1.2");
AddAlgorithm("CAMELLIA",
"CAMELLIAWRAP");
AddAlgorithm("CAMELLIA128",
NttObjectIdentifiers.IdCamellia128Cbc,
NttObjectIdentifiers.IdCamellia128Wrap);
AddAlgorithm("CAMELLIA192",
NttObjectIdentifiers.IdCamellia192Cbc,
NttObjectIdentifiers.IdCamellia192Wrap);
AddAlgorithm("CAMELLIA256",
NttObjectIdentifiers.IdCamellia256Cbc,
NttObjectIdentifiers.IdCamellia256Wrap);
AddAlgorithm("CAST5",
"1.2.840.113533.7.66.10");
AddAlgorithm("CAST6");
AddAlgorithm("DES",
OiwObjectIdentifiers.DesCbc,
OiwObjectIdentifiers.DesCfb,
OiwObjectIdentifiers.DesEcb,
OiwObjectIdentifiers.DesOfb);
AddAlgorithm("DESEDE",
"DESEDEWRAP",
"TDEA",
OiwObjectIdentifiers.DesEde,
PkcsObjectIdentifiers.IdAlgCms3DesWrap);
AddAlgorithm("DESEDE3",
PkcsObjectIdentifiers.DesEde3Cbc);
AddAlgorithm("GOST28147",
"GOST",
"GOST-28147",
CryptoProObjectIdentifiers.GostR28147Cbc);
AddAlgorithm("HC128");
AddAlgorithm("HC256");
AddAlgorithm("IDEA",
"1.3.6.1.4.1.188.7.1.1.2");
AddAlgorithm("NOEKEON");
AddAlgorithm("RC2",
PkcsObjectIdentifiers.RC2Cbc,
PkcsObjectIdentifiers.IdAlgCmsRC2Wrap);
AddAlgorithm("RC4",
"ARC4",
"1.2.840.113549.3.4");
AddAlgorithm("RC5",
"RC5-32");
AddAlgorithm("RC5-64");
AddAlgorithm("RC6");
AddAlgorithm("RIJNDAEL");
AddAlgorithm("SALSA20");
AddAlgorithm("SEED",
KisaObjectIdentifiers.IdNpkiAppCmsSeedWrap,
KisaObjectIdentifiers.IdSeedCbc);
AddAlgorithm("SERPENT");
AddAlgorithm("SKIPJACK");
AddAlgorithm("TEA");
AddAlgorithm("THREEFISH-256");
AddAlgorithm("THREEFISH-512");
AddAlgorithm("THREEFISH-1024");
AddAlgorithm("TNEPRES");
AddAlgorithm("TWOFISH");
AddAlgorithm("VMPC");
AddAlgorithm("VMPC-KSA3");
AddAlgorithm("XTEA");
AddBasicIVSizeEntries(8, "BLOWFISH", "DES", "DESEDE", "DESEDE3");
AddBasicIVSizeEntries(16, "AES", "AES128", "AES192", "AES256",
"CAMELLIA", "CAMELLIA128", "CAMELLIA192", "CAMELLIA256", "NOEKEON", "SEED");
// TODO These algorithms support an IV
// but JCE doesn't seem to provide an AlgorithmParametersGenerator for them
// "RIJNDAEL", "SKIPJACK", "TWOFISH"
}
private static void AddAlgorithm(
string canonicalName,
params object[] aliases)
{
algorithms[canonicalName] = canonicalName;
foreach (object alias in aliases)
{
algorithms[alias.ToString()] = canonicalName;
}
}
private static void AddBasicIVSizeEntries(int size, params string[] algorithms)
{
foreach (string algorithm in algorithms)
{
basicIVSizes.Add(algorithm, size);
}
}
public static string GetCanonicalAlgorithmName(
string algorithm)
{
return (string) algorithms[Platform.ToUpperInvariant(algorithm)];
}
public static KeyParameter CreateKeyParameter(
DerObjectIdentifier algOid,
byte[] keyBytes)
{
return CreateKeyParameter(algOid.Id, keyBytes, 0, keyBytes.Length);
}
public static KeyParameter CreateKeyParameter(
string algorithm,
byte[] keyBytes)
{
return CreateKeyParameter(algorithm, keyBytes, 0, keyBytes.Length);
}
public static KeyParameter CreateKeyParameter(
DerObjectIdentifier algOid,
byte[] keyBytes,
int offset,
int length)
{
return CreateKeyParameter(algOid.Id, keyBytes, offset, length);
}
public static KeyParameter CreateKeyParameter(
string algorithm,
byte[] keyBytes,
int offset,
int length)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
string canonical = GetCanonicalAlgorithmName(algorithm);
if (canonical == null)
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
if (canonical == "DES")
return new DesParameters(keyBytes, offset, length);
if (canonical == "DESEDE" || canonical =="DESEDE3")
return new DesEdeParameters(keyBytes, offset, length);
if (canonical == "RC2")
return new RC2Parameters(keyBytes, offset, length);
return new KeyParameter(keyBytes, offset, length);
}
public static ICipherParameters GetCipherParameters(
DerObjectIdentifier algOid,
ICipherParameters key,
Asn1Object asn1Params)
{
return GetCipherParameters(algOid.Id, key, asn1Params);
}
public static ICipherParameters GetCipherParameters(
string algorithm,
ICipherParameters key,
Asn1Object asn1Params)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
string canonical = GetCanonicalAlgorithmName(algorithm);
if (canonical == null)
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
byte[] iv = null;
try
{
// TODO These algorithms support an IV
// but JCE doesn't seem to provide an AlgorithmParametersGenerator for them
// "RIJNDAEL", "SKIPJACK", "TWOFISH"
int basicIVKeySize = FindBasicIVSize(canonical);
if (basicIVKeySize != -1
|| canonical == "RIJNDAEL" || canonical == "SKIPJACK" || canonical == "TWOFISH")
{
iv = ((Asn1OctetString) asn1Params).GetOctets();
}
else if (canonical == "CAST5")
{
iv = Cast5CbcParameters.GetInstance(asn1Params).GetIV();
}
else if (canonical == "IDEA")
{
iv = IdeaCbcPar.GetInstance(asn1Params).GetIV();
}
else if (canonical == "RC2")
{
iv = RC2CbcParameter.GetInstance(asn1Params).GetIV();
}
}
catch (Exception e)
{
throw new ArgumentException("Could not process ASN.1 parameters", e);
}
if (iv != null)
{
return new ParametersWithIV(key, iv);
}
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
public static Asn1Encodable GenerateParameters(
DerObjectIdentifier algID,
SecureRandom random)
{
return GenerateParameters(algID.Id, random);
}
public static Asn1Encodable GenerateParameters(
string algorithm,
SecureRandom random)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
string canonical = GetCanonicalAlgorithmName(algorithm);
if (canonical == null)
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
// TODO These algorithms support an IV
// but JCE doesn't seem to provide an AlgorithmParametersGenerator for them
// "RIJNDAEL", "SKIPJACK", "TWOFISH"
int basicIVKeySize = FindBasicIVSize(canonical);
if (basicIVKeySize != -1)
return CreateIVOctetString(random, basicIVKeySize);
if (canonical == "CAST5")
return new Cast5CbcParameters(CreateIV(random, 8), 128);
if (canonical == "IDEA")
return new IdeaCbcPar(CreateIV(random, 8));
if (canonical == "RC2")
return new RC2CbcParameter(CreateIV(random, 8));
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
private static Asn1OctetString CreateIVOctetString(
SecureRandom random,
int ivLength)
{
return new DerOctetString(CreateIV(random, ivLength));
}
private static byte[] CreateIV(
SecureRandom random,
int ivLength)
{
byte[] iv = new byte[ivLength];
random.NextBytes(iv);
return iv;
}
private static int FindBasicIVSize(
string canonicalName)
{
if (!basicIVSizes.Contains(canonicalName))
return -1;
return (int)basicIVSizes[canonicalName];
}
}
}
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