pkcs7padding.java

来自「进行与数字证书相关开发必须的java源码」· Java 代码 · 共 51 行

// 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:   PKCS7Padding.java

package jit.crypto.paddings;

import jit.crypto.InvalidCipherTextException;
import jit.security.SecureRandom;

// Referenced classes of package jit.crypto.paddings:
//            BlockCipherPadding

public class PKCS7Padding
    implements BlockCipherPadding
{

    public PKCS7Padding()
    {
    }

    public void init(SecureRandom securerandom)
        throws IllegalArgumentException
    {
    }

    public String getPaddingName()
    {
        return "PKCS7";
    }

    public int addPadding(byte in[], int inOff)
    {
        byte code = (byte)(in.length - inOff);
        for(; inOff < in.length; inOff++)
            in[inOff] = code;

        return code;
    }

    public int padCount(byte in[])
        throws InvalidCipherTextException
    {
        int count = in[in.length - 1] & 0xff;
        if(count > in.length)
            throw new InvalidCipherTextException("pad block corrupted");
        else
            return count;
    }
}