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位置加密applet基本实现，目录下包含c java参考代码、打包工具、说明文档、 #2

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zcy merged 20 commits from zcy_dev_cap into main 2025-09-09 02:39:35 +00:00
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Project/Src/com/cscn/Zuc256EncryptCtx.java
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@@ -1,141 +1,129 @@
package com.zuc.zuc256;
package com.cscn.zuc256;
import com.cscn.Zuc256Core;
import com.cscn.Zuc256State;
import java.util.Arrays;
import javacard.framework.JCSystem;
import javacard.framework.Util;
/**
* 加密上下文类（Java Card兼容版本）
* 加密上下文类
*/
public final class Zuc256EncryptCtx {
Zuc256State state;
byte[] buf;
short buflen;
int buflen;
// 构造函数 - 使用已分配的缓冲区
public Zuc256EncryptCtx(Zuc256State state, byte[] buf) {
public Zuc256EncryptCtx(Zuc256State state, byte[] buf){
this.state = state;
this.buf = buf;
this.buflen = 0;
}
// 构造函数 - 自动分配缓冲区
public Zuc256EncryptCtx(Zuc256State state) {
public Zuc256EncryptCtx(Zuc256State state){
this.state = state;
this.buf = JCSystem.makeTransientByteArray((short)4, JCSystem.CLEAR_ON_DESELECT);
this.buflen = 0;
this.buf = new byte[4];
}
// 构造函数 - 完整初始化
public Zuc256EncryptCtx() {
public Zuc256EncryptCtx(){
this.state = new Zuc256State();
this.buf = JCSystem.makeTransientByteArray((short)4, JCSystem.CLEAR_ON_DESELECT);
this.buflen = 0;
this.buf = new byte[4];
}
// 初始化加密上下文
public void init(byte[] key32, short keyOff, short keyLen, byte[] iv, short ivOff, short ivLen) {
// 清空缓冲区
Util.arrayFillNonAtomic(buf, (short)0, (short)buf.length, (byte)0);
public void init(byte[] key32, byte[] iv) {
Arrays.fill(this.buf, (byte) 0);
this.buflen = 0;
// 初始化状态
Zuc256Core.initState(this.state, key32, keyOff, keyLen, iv, ivOff, ivLen);
Zuc256Core.initState(this.state, key32, iv);
}
// 分阶段处理加密数据
public void update(byte[] in, short inOff, short inlen, byte[] out, short outOff) {
public void update(byte[] in, int inlen, byte[] out) {
if (in == null || out == null || inlen == 0) return;
short currentInOff = inOff;
short currentOutOff = outOff;
// 处理缓冲区中剩余的非4字节数据
if (this.buflen > 0) {
short need = (short)(4 - this.buflen);
short copy = (short)Math.min(inlen, need);
int need = 4 - this.buflen;
int copy = Math.min(inlen, need);
// 复制数据到缓冲区
Util.arrayCopyNonAtomic(in, currentInOff, this.buf, this.buflen, copy);
System.arraycopy(in, 0, this.buf, this.buflen, copy);
this.buflen += copy;
// 调整输入指针和长度
currentInOff += copy;
byte[] newIn = new byte[inlen - copy];
if (inlen - copy > 0) {
System.arraycopy(in, copy, newIn, 0, inlen - copy);
}
in = newIn;
inlen -= copy;
// 缓冲区已满，处理一个完整的4字节块
if (this.buflen == 4) {
short keystream = zuc256GenerateKeyword(this.state);
short plain = getU16(this.buf, (short)0); // 改为16位操作
putU16(out, currentOutOff, (short)(plain ^ keystream));
int keystream = zuc256GenerateKeyword(this.state);
int plain = getU32(this.buf, 0);
putU32(out, 0, plain ^ keystream);
// 重置缓冲区
this.buflen = 0;
Util.arrayFillNonAtomic(this.buf, (short)0, (short)this.buf.length, (byte)0);
Arrays.fill(this.buf, (byte) 0);
// 调整输出指针
currentOutOff += 2; // 16位数据占2字节
byte[] newOut = new byte[out.length - 4];
if (out.length - 4 > 0) {
System.arraycopy(out, 4, newOut, 0, out.length - 4);
}
out = newOut;
}
}
// 处理完整的2字节块（Java Card 16位操作）
if (inlen > 0) {
short fullBlocks = (short)(inlen / 2); // 16位块
// 处理完整的4字节块
int fullBlocks = inlen / 4;
if (fullBlocks > 0) {
short[] keystream = JCSystem.makeTransientShortArray(fullBlocks, JCSystem.CLEAR_ON_DESELECT);
int[] keystream = new int[fullBlocks];
zuc256GenerateKeystream(this.state, fullBlocks, keystream);
// 逐块异或加密
for (short i = 0; i < fullBlocks; i++) {
short plain = getU16(in, (short)(currentInOff + (short)(i * 2)));
putU16(out, (short)(currentOutOff + (short)(i * 2)), (short)(plain ^ keystream[i]));
for (int i = 0; i < fullBlocks; i++) {
int plain = getU32(in, i * 4);
putU32(out, i * 4, plain ^ keystream[i]);
}
// 调整输入指针和长度
short processed = (short)(fullBlocks * 2);
currentInOff += processed;
int processed = fullBlocks * 4;
byte[] newIn = new byte[inlen - processed];
if (inlen - processed > 0) {
System.arraycopy(in, processed, newIn, 0, inlen - processed);
}
in = newIn;
inlen -= processed;
}
// 缓存剩余不足2字节的数据
// 缓存剩余不足4字节的数据
if (inlen > 0) {
Util.arrayCopyNonAtomic(in, currentInOff, this.buf, (short)0, inlen);
System.arraycopy(in, 0, this.buf, 0, inlen);
this.buflen = inlen;
}
}
}
// 完成加密处理
public void finish(byte[] out, short outOff) {
if (out == null) return;
public void finish(byte[] out) {
if (this == null || out == null) return;
// 处理缓冲区中剩余的不足2字节数据
// 处理缓冲区中剩余的不足4字节数据
if (this.buflen > 0) {
short keystream = zuc256GenerateKeyword(this.state);
byte[] keystreamBytes = JCSystem.makeTransientByteArray((short)2, JCSystem.CLEAR_ON_DESELECT);
putU16(keystreamBytes, (short)0, keystream);
int keystream = zuc256GenerateKeyword(this.state);
byte[] keystreamBytes = new byte[4];
putU32(keystreamBytes, 0, keystream);
// 逐字节异或
for (short i = 0; i < this.buflen; i++) {
out[(short)(outOff + i)] = (byte)(this.buf[i] ^ keystreamBytes[i]);
for (int i = 0; i < this.buflen; i++) {
out[i] = (byte) (this.buf[i] ^ keystreamBytes[i]);
}
}
// 清理上下文
Util.arrayFillNonAtomic(this.buf, (short)0, (short)this.buf.length, (byte)0);
Arrays.fill(this.buf, (byte) 0);
this.buflen = 0;
// 清理状态
Util.arrayFillNonAtomic(this.state.LFSR, (short)0, (short)this.state.LFSR.length, (short)0);
Arrays.fill(this.state.LFSR, 0);
this.state.R1 = 0;
this.state.R2 = 0;
}
// 16位数据读取（替代原32位实现）
private short getU16(byte[] buf, short off) {
return (short)(((buf[off] & 0xFF) << 8) | (buf[(short)(off + 1)] & 0xFF));
}
// 16位数据写入（替代原32位实现）
private void putU16(byte[] buf, short off, short value) {
buf[off] = (byte)((value >>> 8) & 0xFF);
buf[(short)(off + 1)] = (byte)(value & 0xFF);
}
}