pkcs12parametersgenerator.java

进行与数字证书相关开发必须的java源码

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   PKCS12ParametersGenerator.java

package jit.crypto.generators;

import jit.crypto.*;
import jit.crypto.digests.*;
import jit.crypto.params.KeyParameter;
import jit.crypto.params.ParametersWithIV;

public class PKCS12ParametersGenerator extends PBEParametersGenerator
{

    public static final int KEY_MATERIAL = 1;
    public static final int IV_MATERIAL = 2;
    public static final int MAC_MATERIAL = 3;
    private Digest digest;
    private int u;
    private int v;

    public PKCS12ParametersGenerator(Digest digest)
    {
        this.digest = digest;
        if(digest instanceof MD5Digest)
        {
            u = 16;
            v = 64;
        } else
        if(digest instanceof SHA1Digest)
        {
            u = 20;
            v = 64;
        } else
        if(digest instanceof RIPEMD160Digest)
        {
            u = 20;
            v = 64;
        } else
        {
            throw new IllegalArgumentException(String.valueOf(String.valueOf((new StringBuffer("Digest ")).append(digest.getAlgorithmName()).append(" unsupported"))));
        }
    }

    private void adjust(byte a[], int aOff, byte b[])
    {
        int x = (b[b.length - 1] & 0xff) + (a[(aOff + b.length) - 1] & 0xff) + 1;
        a[(aOff + b.length) - 1] = (byte)x;
        x >>>= 8;
        for(int i = b.length - 2; i >= 0; i--)
        {
            x += (b[i] & 0xff) + (a[aOff + i] & 0xff);
            a[aOff + i] = (byte)x;
            x >>>= 8;
        }

    }

    private byte[] generateDerivedKey(int idByte, int n)
    {
        byte D[] = new byte[v];
        byte dKey[] = new byte[n];
        for(int i = 0; i != D.length; i++)
            D[i] = (byte)idByte;

        byte S[];
        if(salt != null && salt.length != 0)
        {
            S = new byte[v * (((salt.length + v) - 1) / v)];
            for(int i = 0; i != S.length; i++)
                S[i] = salt[i % salt.length];

        } else
        {
            S = new byte[0];
        }
        byte P[];
        if(password != null && password.length != 0)
        {
            P = new byte[v * (((password.length + v) - 1) / v)];
            for(int i = 0; i != P.length; i++)
                P[i] = password[i % password.length];

        } else
        {
            P = new byte[0];
        }
        byte I[] = new byte[S.length + P.length];
        System.arraycopy(S, 0, I, 0, S.length);
        System.arraycopy(P, 0, I, S.length, P.length);
        byte B[] = new byte[v];
        int c = ((n + u) - 1) / u;
        for(int i = 1; i <= c; i++)
        {
            byte A[] = new byte[u];
            digest.update(D, 0, D.length);
            digest.update(I, 0, I.length);
            digest.doFinal(A, 0);
            for(int j = 1; j != iterationCount; j++)
            {
                digest.update(A, 0, A.length);
                digest.doFinal(A, 0);
            }

            for(int j = 0; j != B.length; j++)
                B[j] = A[j % A.length];

            for(int j = 0; j != I.length / v; j++)
                adjust(I, j * v, B);

            if(i == c)
                System.arraycopy(A, 0, dKey, (i - 1) * u, dKey.length - (i - 1) * u);
            else
                System.arraycopy(A, 0, dKey, (i - 1) * u, A.length);
        }

        return dKey;
    }

    public CipherParameters generateDerivedParameters(int keySize)
    {
        keySize /= 8;
        byte dKey[] = generateDerivedKey(1, keySize);
        return new KeyParameter(dKey, 0, keySize);
    }

    public CipherParameters generateDerivedParameters(int keySize, int ivSize)
    {
        keySize /= 8;
        ivSize /= 8;
        byte dKey[] = generateDerivedKey(1, keySize);
        byte iv[] = generateDerivedKey(2, ivSize);
        return new ParametersWithIV(new KeyParameter(dKey, 0, keySize), iv, 0, ivSize);
    }

    public CipherParameters generateDerivedMacParameters(int keySize)
    {
        keySize /= 8;
        byte dKey[] = generateDerivedKey(3, keySize);
        return new KeyParameter(dKey, 0, keySize);
    }

    static 
    {
        KEY_MATERIAL = 1;
        IV_MATERIAL = 2;
        MAC_MATERIAL = 3;
    }
}