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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);

}

}

}