- Initial commit

Runtime/3rdParty/BouncyCastle/crypto/generators/Pkcs5S2ParametersGenerator.cs

@@ -0,0 +1,148 @@
+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Digests;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Macs;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Math;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Generators
+{
+    /**
+    * Generator for Pbe derived keys and ivs as defined by Pkcs 5 V2.0 Scheme 2.
+    * This generator uses a SHA-1 HMac as the calculation function.
+    * <p>
+    * The document this implementation is based on can be found at
+    * <a href="http://www.rsasecurity.com/rsalabs/pkcs/pkcs-5/index.html">
+    * RSA's Pkcs5 Page</a></p>
+    */
+    public class Pkcs5S2ParametersGenerator
+        : PbeParametersGenerator
+    {
+        private readonly IMac hMac;
+        private readonly byte[] state;
+
+        /**
+        * construct a Pkcs5 Scheme 2 Parameters generator.
+        */
+        public Pkcs5S2ParametersGenerator()
+            : this(new Sha1Digest())
+        {
+        }
+
+        public Pkcs5S2ParametersGenerator(IDigest digest)
+        {
+            this.hMac = new HMac(digest);
+            this.state = new byte[hMac.GetMacSize()];
+        }
+
+        private void F(
+            byte[]  S,
+            int     c,
+            byte[]  iBuf,
+            byte[]  outBytes,
+            int     outOff)
+        {
+            if (c == 0)
+                throw new ArgumentException("iteration count must be at least 1.");
+
+            if (S != null)
+            {
+                hMac.BlockUpdate(S, 0, S.Length);
+            }
+
+            hMac.BlockUpdate(iBuf, 0, iBuf.Length);
+            hMac.DoFinal(state, 0);
+
+            Array.Copy(state, 0, outBytes, outOff, state.Length);
+
+            for (int count = 1; count < c; ++count)
+            {
+                hMac.BlockUpdate(state, 0, state.Length);
+                hMac.DoFinal(state, 0);
+
+                for (int j = 0; j < state.Length; ++j)
+                {
+                    outBytes[outOff + j] ^= state[j];
+                }
+            }
+        }
+
+        private byte[] GenerateDerivedKey(
+            int dkLen)
+        {
+            int     hLen = hMac.GetMacSize();
+            int     l = (dkLen + hLen - 1) / hLen;
+            byte[]  iBuf = new byte[4];
+            byte[]  outBytes = new byte[l * hLen];
+            int     outPos = 0;
+
+            ICipherParameters param = new KeyParameter(mPassword);
+
+            hMac.Init(param);
+
+            for (int i = 1; i <= l; i++)
+            {
+                // Increment the value in 'iBuf'
+                int pos = 3;
+                while (++iBuf[pos] == 0)
+                {
+                    --pos;
+                }
+
+                F(mSalt, mIterationCount, iBuf, outBytes, outPos);
+                outPos += hLen;
+            }
+
+            return outBytes;
+        }
+
+        public override ICipherParameters GenerateDerivedParameters(
+            string	algorithm,
+            int		keySize)
+        {
+            keySize /= 8;
+
+            byte[] dKey = GenerateDerivedKey(keySize);
+
+            return ParameterUtilities.CreateKeyParameter(algorithm, dKey, 0, keySize);
+        }
+
+        public override ICipherParameters GenerateDerivedParameters(
+            string	algorithm,
+            int		keySize,
+            int		ivSize)
+        {
+            keySize /= 8;
+            ivSize /= 8;
+
+            byte[] dKey = GenerateDerivedKey(keySize + ivSize);
+            KeyParameter key = ParameterUtilities.CreateKeyParameter(algorithm, dKey, 0, keySize);
+
+            return new ParametersWithIV(key, dKey, keySize, ivSize);
+        }
+
+        /**
+        * Generate a key parameter for use with a MAC derived from the password,
+        * salt, and iteration count we are currently initialised with.
+        *
+        * @param keySize the size of the key we want (in bits)
+        * @return a KeyParameter object.
+        */
+        public override ICipherParameters GenerateDerivedMacParameters(
+            int keySize)
+        {
+            keySize /= 8;
+
+            byte[] dKey = GenerateDerivedKey(keySize);
+
+            return new KeyParameter(dKey, 0, keySize);
+        }
+    }
+}
+#pragma warning restore
+#endif