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316 lines
13 KiB
316 lines
13 KiB
1 year ago
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Engines
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{
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/**
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* an implementation of RC2 as described in RFC 2268
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* "A Description of the RC2(r) Encryption Algorithm" R. Rivest.
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*/
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public class RC2Engine
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: IBlockCipher
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{
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//
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// the values we use for key expansion (based on the digits of PI)
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//
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private static readonly byte[] piTable =
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{
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(byte)0xd9, (byte)0x78, (byte)0xf9, (byte)0xc4, (byte)0x19, (byte)0xdd, (byte)0xb5, (byte)0xed,
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(byte)0x28, (byte)0xe9, (byte)0xfd, (byte)0x79, (byte)0x4a, (byte)0xa0, (byte)0xd8, (byte)0x9d,
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(byte)0xc6, (byte)0x7e, (byte)0x37, (byte)0x83, (byte)0x2b, (byte)0x76, (byte)0x53, (byte)0x8e,
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(byte)0x62, (byte)0x4c, (byte)0x64, (byte)0x88, (byte)0x44, (byte)0x8b, (byte)0xfb, (byte)0xa2,
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(byte)0x17, (byte)0x9a, (byte)0x59, (byte)0xf5, (byte)0x87, (byte)0xb3, (byte)0x4f, (byte)0x13,
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(byte)0x61, (byte)0x45, (byte)0x6d, (byte)0x8d, (byte)0x9, (byte)0x81, (byte)0x7d, (byte)0x32,
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(byte)0xbd, (byte)0x8f, (byte)0x40, (byte)0xeb, (byte)0x86, (byte)0xb7, (byte)0x7b, (byte)0xb,
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(byte)0xf0, (byte)0x95, (byte)0x21, (byte)0x22, (byte)0x5c, (byte)0x6b, (byte)0x4e, (byte)0x82,
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(byte)0x54, (byte)0xd6, (byte)0x65, (byte)0x93, (byte)0xce, (byte)0x60, (byte)0xb2, (byte)0x1c,
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(byte)0x73, (byte)0x56, (byte)0xc0, (byte)0x14, (byte)0xa7, (byte)0x8c, (byte)0xf1, (byte)0xdc,
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(byte)0x12, (byte)0x75, (byte)0xca, (byte)0x1f, (byte)0x3b, (byte)0xbe, (byte)0xe4, (byte)0xd1,
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(byte)0x42, (byte)0x3d, (byte)0xd4, (byte)0x30, (byte)0xa3, (byte)0x3c, (byte)0xb6, (byte)0x26,
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(byte)0x6f, (byte)0xbf, (byte)0xe, (byte)0xda, (byte)0x46, (byte)0x69, (byte)0x7, (byte)0x57,
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(byte)0x27, (byte)0xf2, (byte)0x1d, (byte)0x9b, (byte)0xbc, (byte)0x94, (byte)0x43, (byte)0x3,
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(byte)0xf8, (byte)0x11, (byte)0xc7, (byte)0xf6, (byte)0x90, (byte)0xef, (byte)0x3e, (byte)0xe7,
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(byte)0x6, (byte)0xc3, (byte)0xd5, (byte)0x2f, (byte)0xc8, (byte)0x66, (byte)0x1e, (byte)0xd7,
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(byte)0x8, (byte)0xe8, (byte)0xea, (byte)0xde, (byte)0x80, (byte)0x52, (byte)0xee, (byte)0xf7,
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(byte)0x84, (byte)0xaa, (byte)0x72, (byte)0xac, (byte)0x35, (byte)0x4d, (byte)0x6a, (byte)0x2a,
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(byte)0x96, (byte)0x1a, (byte)0xd2, (byte)0x71, (byte)0x5a, (byte)0x15, (byte)0x49, (byte)0x74,
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(byte)0x4b, (byte)0x9f, (byte)0xd0, (byte)0x5e, (byte)0x4, (byte)0x18, (byte)0xa4, (byte)0xec,
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(byte)0xc2, (byte)0xe0, (byte)0x41, (byte)0x6e, (byte)0xf, (byte)0x51, (byte)0xcb, (byte)0xcc,
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(byte)0x24, (byte)0x91, (byte)0xaf, (byte)0x50, (byte)0xa1, (byte)0xf4, (byte)0x70, (byte)0x39,
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(byte)0x99, (byte)0x7c, (byte)0x3a, (byte)0x85, (byte)0x23, (byte)0xb8, (byte)0xb4, (byte)0x7a,
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(byte)0xfc, (byte)0x2, (byte)0x36, (byte)0x5b, (byte)0x25, (byte)0x55, (byte)0x97, (byte)0x31,
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(byte)0x2d, (byte)0x5d, (byte)0xfa, (byte)0x98, (byte)0xe3, (byte)0x8a, (byte)0x92, (byte)0xae,
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(byte)0x5, (byte)0xdf, (byte)0x29, (byte)0x10, (byte)0x67, (byte)0x6c, (byte)0xba, (byte)0xc9,
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(byte)0xd3, (byte)0x0, (byte)0xe6, (byte)0xcf, (byte)0xe1, (byte)0x9e, (byte)0xa8, (byte)0x2c,
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(byte)0x63, (byte)0x16, (byte)0x1, (byte)0x3f, (byte)0x58, (byte)0xe2, (byte)0x89, (byte)0xa9,
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(byte)0xd, (byte)0x38, (byte)0x34, (byte)0x1b, (byte)0xab, (byte)0x33, (byte)0xff, (byte)0xb0,
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(byte)0xbb, (byte)0x48, (byte)0xc, (byte)0x5f, (byte)0xb9, (byte)0xb1, (byte)0xcd, (byte)0x2e,
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(byte)0xc5, (byte)0xf3, (byte)0xdb, (byte)0x47, (byte)0xe5, (byte)0xa5, (byte)0x9c, (byte)0x77,
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(byte)0xa, (byte)0xa6, (byte)0x20, (byte)0x68, (byte)0xfe, (byte)0x7f, (byte)0xc1, (byte)0xad
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};
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private const int BLOCK_SIZE = 8;
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private int[] workingKey;
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private bool encrypting;
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private int[] GenerateWorkingKey(
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byte[] key,
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int bits)
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{
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int x;
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int[] xKey = new int[128];
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for (int i = 0; i != key.Length; i++)
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{
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xKey[i] = key[i] & 0xff;
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}
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// Phase 1: Expand input key to 128 bytes
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int len = key.Length;
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if (len < 128)
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{
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int index = 0;
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x = xKey[len - 1];
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do
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{
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x = piTable[(x + xKey[index++]) & 255] & 0xff;
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xKey[len++] = x;
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}
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while (len < 128);
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}
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// Phase 2 - reduce effective key size to "bits"
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len = (bits + 7) >> 3;
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x = piTable[xKey[128 - len] & (255 >> (7 & -bits))] & 0xff;
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xKey[128 - len] = x;
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for (int i = 128 - len - 1; i >= 0; i--)
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{
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x = piTable[x ^ xKey[i + len]] & 0xff;
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xKey[i] = x;
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}
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// Phase 3 - copy to newKey in little-endian order
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int[] newKey = new int[64];
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for (int i = 0; i != newKey.Length; i++)
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{
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newKey[i] = (xKey[2 * i] + (xKey[2 * i + 1] << 8));
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}
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return newKey;
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}
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/**
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* initialise a RC2 cipher.
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*
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* @param forEncryption whether or not we are for encryption.
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* @param parameters the parameters required to set up the cipher.
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* @exception ArgumentException if the parameters argument is
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* inappropriate.
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*/
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public virtual void Init(
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bool forEncryption,
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ICipherParameters parameters)
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{
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this.encrypting = forEncryption;
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if (parameters is RC2Parameters)
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{
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RC2Parameters param = (RC2Parameters) parameters;
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workingKey = GenerateWorkingKey(param.GetKey(), param.EffectiveKeyBits);
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}
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else if (parameters is KeyParameter)
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{
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KeyParameter param = (KeyParameter) parameters;
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byte[] key = param.GetKey();
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workingKey = GenerateWorkingKey(key, key.Length * 8);
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}
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else
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{
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throw new ArgumentException("invalid parameter passed to RC2 init - " + BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Platform.GetTypeName(parameters));
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}
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}
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public virtual void Reset()
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{
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}
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public virtual string AlgorithmName
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{
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get { return "RC2"; }
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}
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public virtual bool IsPartialBlockOkay
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{
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get { return false; }
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}
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public virtual int GetBlockSize()
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{
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return BLOCK_SIZE;
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}
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public virtual int ProcessBlock(
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byte[] input,
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int inOff,
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byte[] output,
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int outOff)
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{
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if (workingKey == null)
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throw new InvalidOperationException("RC2 engine not initialised");
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Check.DataLength(input, inOff, BLOCK_SIZE, "input buffer too short");
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Check.OutputLength(output, outOff, BLOCK_SIZE, "output buffer too short");
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if (encrypting)
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{
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EncryptBlock(input, inOff, output, outOff);
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}
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else
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{
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DecryptBlock(input, inOff, output, outOff);
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}
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return BLOCK_SIZE;
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}
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/**
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* return the result rotating the 16 bit number in x left by y
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*/
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private int RotateWordLeft(
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int x,
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int y)
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{
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x &= 0xffff;
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return (x << y) | (x >> (16 - y));
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}
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private void EncryptBlock(
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byte[] input,
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int inOff,
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byte[] outBytes,
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int outOff)
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{
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int x76, x54, x32, x10;
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x76 = ((input[inOff + 7] & 0xff) << 8) + (input[inOff + 6] & 0xff);
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x54 = ((input[inOff + 5] & 0xff) << 8) + (input[inOff + 4] & 0xff);
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x32 = ((input[inOff + 3] & 0xff) << 8) + (input[inOff + 2] & 0xff);
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x10 = ((input[inOff + 1] & 0xff) << 8) + (input[inOff + 0] & 0xff);
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for (int i = 0; i <= 16; i += 4)
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{
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x10 = RotateWordLeft(x10 + (x32 & ~x76) + (x54 & x76) + workingKey[i ], 1);
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x32 = RotateWordLeft(x32 + (x54 & ~x10) + (x76 & x10) + workingKey[i+1], 2);
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x54 = RotateWordLeft(x54 + (x76 & ~x32) + (x10 & x32) + workingKey[i+2], 3);
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x76 = RotateWordLeft(x76 + (x10 & ~x54) + (x32 & x54) + workingKey[i+3], 5);
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}
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x10 += workingKey[x76 & 63];
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x32 += workingKey[x10 & 63];
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x54 += workingKey[x32 & 63];
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x76 += workingKey[x54 & 63];
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for (int i = 20; i <= 40; i += 4)
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{
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x10 = RotateWordLeft(x10 + (x32 & ~x76) + (x54 & x76) + workingKey[i ], 1);
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x32 = RotateWordLeft(x32 + (x54 & ~x10) + (x76 & x10) + workingKey[i+1], 2);
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x54 = RotateWordLeft(x54 + (x76 & ~x32) + (x10 & x32) + workingKey[i+2], 3);
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x76 = RotateWordLeft(x76 + (x10 & ~x54) + (x32 & x54) + workingKey[i+3], 5);
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}
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x10 += workingKey[x76 & 63];
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x32 += workingKey[x10 & 63];
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x54 += workingKey[x32 & 63];
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x76 += workingKey[x54 & 63];
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for (int i = 44; i < 64; i += 4)
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{
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x10 = RotateWordLeft(x10 + (x32 & ~x76) + (x54 & x76) + workingKey[i ], 1);
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x32 = RotateWordLeft(x32 + (x54 & ~x10) + (x76 & x10) + workingKey[i+1], 2);
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x54 = RotateWordLeft(x54 + (x76 & ~x32) + (x10 & x32) + workingKey[i+2], 3);
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x76 = RotateWordLeft(x76 + (x10 & ~x54) + (x32 & x54) + workingKey[i+3], 5);
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}
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outBytes[outOff + 0] = (byte)x10;
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outBytes[outOff + 1] = (byte)(x10 >> 8);
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outBytes[outOff + 2] = (byte)x32;
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outBytes[outOff + 3] = (byte)(x32 >> 8);
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outBytes[outOff + 4] = (byte)x54;
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outBytes[outOff + 5] = (byte)(x54 >> 8);
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outBytes[outOff + 6] = (byte)x76;
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outBytes[outOff + 7] = (byte)(x76 >> 8);
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}
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private void DecryptBlock(
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byte[] input,
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int inOff,
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byte[] outBytes,
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int outOff)
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{
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int x76, x54, x32, x10;
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x76 = ((input[inOff + 7] & 0xff) << 8) + (input[inOff + 6] & 0xff);
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x54 = ((input[inOff + 5] & 0xff) << 8) + (input[inOff + 4] & 0xff);
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x32 = ((input[inOff + 3] & 0xff) << 8) + (input[inOff + 2] & 0xff);
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x10 = ((input[inOff + 1] & 0xff) << 8) + (input[inOff + 0] & 0xff);
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for (int i = 60; i >= 44; i -= 4)
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{
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x76 = RotateWordLeft(x76, 11) - ((x10 & ~x54) + (x32 & x54) + workingKey[i+3]);
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x54 = RotateWordLeft(x54, 13) - ((x76 & ~x32) + (x10 & x32) + workingKey[i+2]);
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x32 = RotateWordLeft(x32, 14) - ((x54 & ~x10) + (x76 & x10) + workingKey[i+1]);
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x10 = RotateWordLeft(x10, 15) - ((x32 & ~x76) + (x54 & x76) + workingKey[i ]);
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}
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x76 -= workingKey[x54 & 63];
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x54 -= workingKey[x32 & 63];
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x32 -= workingKey[x10 & 63];
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x10 -= workingKey[x76 & 63];
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for (int i = 40; i >= 20; i -= 4)
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{
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x76 = RotateWordLeft(x76, 11) - ((x10 & ~x54) + (x32 & x54) + workingKey[i+3]);
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x54 = RotateWordLeft(x54, 13) - ((x76 & ~x32) + (x10 & x32) + workingKey[i+2]);
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x32 = RotateWordLeft(x32, 14) - ((x54 & ~x10) + (x76 & x10) + workingKey[i+1]);
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x10 = RotateWordLeft(x10, 15) - ((x32 & ~x76) + (x54 & x76) + workingKey[i ]);
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}
|
||
|
|
|
||
|
|
x76 -= workingKey[x54 & 63];
|
||
|
|
x54 -= workingKey[x32 & 63];
|
||
|
|
x32 -= workingKey[x10 & 63];
|
||
|
|
x10 -= workingKey[x76 & 63];
|
||
|
|
|
||
|
|
for (int i = 16; i >= 0; i -= 4)
|
||
|
|
{
|
||
|
|
x76 = RotateWordLeft(x76, 11) - ((x10 & ~x54) + (x32 & x54) + workingKey[i+3]);
|
||
|
|
x54 = RotateWordLeft(x54, 13) - ((x76 & ~x32) + (x10 & x32) + workingKey[i+2]);
|
||
|
|
x32 = RotateWordLeft(x32, 14) - ((x54 & ~x10) + (x76 & x10) + workingKey[i+1]);
|
||
|
|
x10 = RotateWordLeft(x10, 15) - ((x32 & ~x76) + (x54 & x76) + workingKey[i ]);
|
||
|
|
}
|
||
|
|
|
||
|
|
outBytes[outOff + 0] = (byte)x10;
|
||
|
|
outBytes[outOff + 1] = (byte)(x10 >> 8);
|
||
|
|
outBytes[outOff + 2] = (byte)x32;
|
||
|
|
outBytes[outOff + 3] = (byte)(x32 >> 8);
|
||
|
|
outBytes[outOff + 4] = (byte)x54;
|
||
|
|
outBytes[outOff + 5] = (byte)(x54 >> 8);
|
||
|
|
outBytes[outOff + 6] = (byte)x76;
|
||
|
|
outBytes[outOff + 7] = (byte)(x76 >> 8);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#pragma warning restore
|
||
|
|
#endif
|