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using System;
using System.Collections;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.CryptoPro;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.TeleTrust;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Security
{
/// <remarks>
/// Utility class for creating IDigest objects from their names/Oids
/// </remarks>
public sealed class DigestUtilities
{
private enum DigestAlgorithm {
GOST3411,
KECCAK_224, KECCAK_256, KECCAK_288, KECCAK_384, KECCAK_512,
MD2, MD4, MD5,
RIPEMD128, RIPEMD160, RIPEMD256, RIPEMD320,
SHA_1, SHA_224, SHA_256, SHA_384, SHA_512,
SHA_512_224, SHA_512_256,
SHA3_224, SHA3_256, SHA3_384, SHA3_512,
SHAKE128, SHAKE256,
TIGER,
WHIRLPOOL,
};
private DigestUtilities()
{
}
private static readonly IDictionary algorithms = Platform.CreateHashtable();
private static readonly IDictionary oids = Platform.CreateHashtable();
static DigestUtilities()
{
// Signal to obfuscation tools not to change enum constants
((DigestAlgorithm)Enums.GetArbitraryValue(typeof(DigestAlgorithm))).ToString();
algorithms[PkcsObjectIdentifiers.MD2.Id] = "MD2";
algorithms[PkcsObjectIdentifiers.MD4.Id] = "MD4";
algorithms[PkcsObjectIdentifiers.MD5.Id] = "MD5";
algorithms["SHA1"] = "SHA-1";
algorithms[OiwObjectIdentifiers.IdSha1.Id] = "SHA-1";
algorithms["SHA224"] = "SHA-224";
algorithms[NistObjectIdentifiers.IdSha224.Id] = "SHA-224";
algorithms["SHA256"] = "SHA-256";
algorithms[NistObjectIdentifiers.IdSha256.Id] = "SHA-256";
algorithms["SHA384"] = "SHA-384";
algorithms[NistObjectIdentifiers.IdSha384.Id] = "SHA-384";
algorithms["SHA512"] = "SHA-512";
algorithms[NistObjectIdentifiers.IdSha512.Id] = "SHA-512";
algorithms["SHA512/224"] = "SHA-512/224";
algorithms[NistObjectIdentifiers.IdSha512_224.Id] = "SHA-512/224";
algorithms["SHA512/256"] = "SHA-512/256";
algorithms[NistObjectIdentifiers.IdSha512_256.Id] = "SHA-512/256";
algorithms["RIPEMD-128"] = "RIPEMD128";
algorithms[TeleTrusTObjectIdentifiers.RipeMD128.Id] = "RIPEMD128";
algorithms["RIPEMD-160"] = "RIPEMD160";
algorithms[TeleTrusTObjectIdentifiers.RipeMD160.Id] = "RIPEMD160";
algorithms["RIPEMD-256"] = "RIPEMD256";
algorithms[TeleTrusTObjectIdentifiers.RipeMD256.Id] = "RIPEMD256";
algorithms["RIPEMD-320"] = "RIPEMD320";
// algorithms[TeleTrusTObjectIdentifiers.RipeMD320.Id] = "RIPEMD320";
algorithms[CryptoProObjectIdentifiers.GostR3411.Id] = "GOST3411";
algorithms[NistObjectIdentifiers.IdSha3_224.Id] = "SHA3-224";
algorithms[NistObjectIdentifiers.IdSha3_256.Id] = "SHA3-256";
algorithms[NistObjectIdentifiers.IdSha3_384.Id] = "SHA3-384";
algorithms[NistObjectIdentifiers.IdSha3_512.Id] = "SHA3-512";
algorithms[NistObjectIdentifiers.IdShake128.Id] = "SHAKE128";
algorithms[NistObjectIdentifiers.IdShake256.Id] = "SHAKE256";
oids["MD2"] = PkcsObjectIdentifiers.MD2;
oids["MD4"] = PkcsObjectIdentifiers.MD4;
oids["MD5"] = PkcsObjectIdentifiers.MD5;
oids["SHA-1"] = OiwObjectIdentifiers.IdSha1;
oids["SHA-224"] = NistObjectIdentifiers.IdSha224;
oids["SHA-256"] = NistObjectIdentifiers.IdSha256;
oids["SHA-384"] = NistObjectIdentifiers.IdSha384;
oids["SHA-512"] = NistObjectIdentifiers.IdSha512;
oids["SHA-512/224"] = NistObjectIdentifiers.IdSha512_224;
oids["SHA-512/256"] = NistObjectIdentifiers.IdSha512_256;
oids["SHA3-224"] = NistObjectIdentifiers.IdSha3_224;
oids["SHA3-256"] = NistObjectIdentifiers.IdSha3_256;
oids["SHA3-384"] = NistObjectIdentifiers.IdSha3_384;
oids["SHA3-512"] = NistObjectIdentifiers.IdSha3_512;
oids["SHAKE128"] = NistObjectIdentifiers.IdShake128;
oids["SHAKE256"] = NistObjectIdentifiers.IdShake256;
oids["RIPEMD128"] = TeleTrusTObjectIdentifiers.RipeMD128;
oids["RIPEMD160"] = TeleTrusTObjectIdentifiers.RipeMD160;
oids["RIPEMD256"] = TeleTrusTObjectIdentifiers.RipeMD256;
oids["GOST3411"] = CryptoProObjectIdentifiers.GostR3411;
}
/// <summary>
/// Returns a ObjectIdentifier for a given digest mechanism.
/// </summary>
/// <param name="mechanism">A string representation of the digest meanism.</param>
/// <returns>A DerObjectIdentifier, null if the Oid is not available.</returns>
public static DerObjectIdentifier GetObjectIdentifier(
string mechanism)
{
if (mechanism == null)
throw new System.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 IDigest GetDigest(
DerObjectIdentifier id)
{
return GetDigest(id.Id);
}
public static IDigest GetDigest(
string algorithm)
{
string upper = Platform.ToUpperInvariant(algorithm);
string mechanism = (string) algorithms[upper];
if (mechanism == null)
{
mechanism = upper;
}
try
{
DigestAlgorithm digestAlgorithm = (DigestAlgorithm)Enums.GetEnumValue(
typeof(DigestAlgorithm), mechanism);
switch (digestAlgorithm)
{
case DigestAlgorithm.GOST3411: return new Gost3411Digest();
case DigestAlgorithm.KECCAK_224: return new KeccakDigest(224);
case DigestAlgorithm.KECCAK_256: return new KeccakDigest(256);
case DigestAlgorithm.KECCAK_288: return new KeccakDigest(288);
case DigestAlgorithm.KECCAK_384: return new KeccakDigest(384);
case DigestAlgorithm.KECCAK_512: return new KeccakDigest(512);
case DigestAlgorithm.MD2: return new MD2Digest();
case DigestAlgorithm.MD4: return new MD4Digest();
case DigestAlgorithm.MD5: return new MD5Digest();
case DigestAlgorithm.RIPEMD128: return new RipeMD128Digest();
case DigestAlgorithm.RIPEMD160: return new RipeMD160Digest();
case DigestAlgorithm.RIPEMD256: return new RipeMD256Digest();
case DigestAlgorithm.RIPEMD320: return new RipeMD320Digest();
case DigestAlgorithm.SHA_1: return new Sha1Digest();
case DigestAlgorithm.SHA_224: return new Sha224Digest();
case DigestAlgorithm.SHA_256: return new Sha256Digest();
case DigestAlgorithm.SHA_384: return new Sha384Digest();
case DigestAlgorithm.SHA_512: return new Sha512Digest();
case DigestAlgorithm.SHA_512_224: return new Sha512tDigest(224);
case DigestAlgorithm.SHA_512_256: return new Sha512tDigest(256);
case DigestAlgorithm.SHA3_224: return new Sha3Digest(224);
case DigestAlgorithm.SHA3_256: return new Sha3Digest(256);
case DigestAlgorithm.SHA3_384: return new Sha3Digest(384);
case DigestAlgorithm.SHA3_512: return new Sha3Digest(512);
case DigestAlgorithm.SHAKE128: return new ShakeDigest(128);
case DigestAlgorithm.SHAKE256: return new ShakeDigest(256);
case DigestAlgorithm.TIGER: return new TigerDigest();
case DigestAlgorithm.WHIRLPOOL: return new WhirlpoolDigest();
}
}
catch (ArgumentException)
{
}
throw new SecurityUtilityException("Digest " + mechanism + " not recognised.");
}
public static string GetAlgorithmName(
DerObjectIdentifier oid)
{
return (string) algorithms[oid.Id];
}
public static byte[] CalculateDigest(string algorithm, byte[] input)
{
IDigest digest = GetDigest(algorithm);
digest.BlockUpdate(input, 0, input.Length);
return DoFinal(digest);
}
public static byte[] DoFinal(
IDigest digest)
{
byte[] b = new byte[digest.GetDigestSize()];
digest.DoFinal(b, 0);
return b;
}
public static byte[] DoFinal(
IDigest digest,
byte[] input)
{
digest.BlockUpdate(input, 0, input.Length);
return DoFinal(digest);
}
}
}
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