diff --git a/Project/Src/com/cscn/Zuc256EncryptCtx.java b/Project/Src/com/cscn/Zuc256EncryptCtx.java
index 42e7e1b..476f5c1 100644
--- a/Project/Src/com/cscn/Zuc256EncryptCtx.java
+++ b/Project/Src/com/cscn/Zuc256EncryptCtx.java
@@ -1,131 +1,141 @@
-package com.cscn;
-
-import java.util.Arrays;
-
-import static com.cscn.Zuc256Core.zuc256GenerateKeystream;
-import static com.cscn.Zuc256Core.zuc256GenerateKeyword;
-import static com.cscn.Zuc256Util.getU32;
-import static com.cscn.Zuc256Util.putU32;
+package com.zuc.zuc256;
 
+import javacard.framework.JCSystem;
+import javacard.framework.Util;
 
 /**
- * 加密上下文类
+ * 加密上下文类（Java Card兼容版本）
  */
 public final class Zuc256EncryptCtx {
     Zuc256State state;
     byte[] buf;
-    int buflen;
+    short buflen;
 
-    public Zuc256EncryptCtx(Zuc256State state, byte[] buf){
+    // 构造函数 - 使用已分配的缓冲区
+    public Zuc256EncryptCtx(Zuc256State state, byte[] buf) {
         this.state = state;
         this.buf = buf;
+        this.buflen = 0;
     }
 
-    public Zuc256EncryptCtx(Zuc256State state){
+    // 构造函数 - 自动分配缓冲区
+    public Zuc256EncryptCtx(Zuc256State state) {
         this.state = state;
-        this.buf = new byte[4];
+        this.buf = JCSystem.makeTransientByteArray((short)4, JCSystem.CLEAR_ON_DESELECT);
+        this.buflen = 0;
     }
 
-    public Zuc256EncryptCtx(){
+    // 构造函数 - 完整初始化
+    public Zuc256EncryptCtx() {
         this.state = new Zuc256State();
-        this.buf = new byte[4];
+        this.buf = JCSystem.makeTransientByteArray((short)4, JCSystem.CLEAR_ON_DESELECT);
+        this.buflen = 0;
     }
 
     // 初始化加密上下文
-    public void init(byte[] key32, byte[] iv) {
-        Arrays.fill(this.buf, (byte) 0);
+    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);
         this.buflen = 0;
-        Zuc256Core.initState(this.state, key32, iv);
+        // 初始化状态
+        Zuc256Core.initState(this.state, key32, keyOff, keyLen, iv, ivOff, ivLen);
     }
 
     // 分阶段处理加密数据
-    public void update(byte[] in, int inlen, byte[] out) {
+    public void update(byte[] in, short inOff, short inlen, byte[] out, short outOff) {
         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) {
-            int need = 4 - this.buflen;
-            int copy = Math.min(inlen, need);
+            short need = (short)(4 - this.buflen);
+            short copy = (short)Math.min(inlen, need);
 
-            System.arraycopy(in, 0, this.buf, this.buflen, copy);
+            // 复制数据到缓冲区
+            Util.arrayCopyNonAtomic(in, currentInOff, this.buf, this.buflen, copy);
             this.buflen += copy;
 
             // 调整输入指针和长度
-            byte[] newIn = new byte[inlen - copy];
-            if (inlen - copy > 0) {
-                System.arraycopy(in, copy, newIn, 0, inlen - copy);
-            }
-            in = newIn;
+            currentInOff += copy;
             inlen -= copy;
 
             // 缓冲区已满，处理一个完整的4字节块
             if (this.buflen == 4) {
-                int keystream = zuc256GenerateKeyword(this.state);
-                int plain = getU32(this.buf, 0);
-                putU32(out, 0, plain ^ keystream);
+                short keystream = zuc256GenerateKeyword(this.state);
+                short plain = getU16(this.buf, (short)0); // 改为16位操作
+                putU16(out, currentOutOff, (short)(plain ^ keystream));
 
+                // 重置缓冲区
                 this.buflen = 0;
-                Arrays.fill(this.buf, (byte) 0);
+                Util.arrayFillNonAtomic(this.buf, (short)0, (short)this.buf.length, (byte)0);
 
                 // 调整输出指针
-                byte[] newOut = new byte[out.length - 4];
-                if (out.length - 4 > 0) {
-                    System.arraycopy(out, 4, newOut, 0, out.length - 4);
-                }
-                out = newOut;
+                currentOutOff += 2; // 16位数据占2字节
             }
         }
 
-        // 处理完整的4字节块
-        int fullBlocks = inlen / 4;
-        if (fullBlocks > 0) {
-            int[] keystream = new int[fullBlocks];
-            zuc256GenerateKeystream(this.state, fullBlocks, keystream);
-
-            // 逐块异或加密
-            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
-            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4字节的数据
+        // 处理完整的2字节块（Java Card 16位操作）
         if (inlen > 0) {
-            System.arraycopy(in, 0, this.buf, 0, inlen);
-            this.buflen = inlen;
+            short fullBlocks = (short)(inlen / 2); // 16位块
+            if (fullBlocks > 0) {
+                short[] keystream = JCSystem.makeTransientShortArray(fullBlocks, JCSystem.CLEAR_ON_DESELECT);
+                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]));
+                }
+
+                // 调整输入指针和长度
+                short processed = (short)(fullBlocks * 2);
+                currentInOff += processed;
+                inlen -= processed;
+            }
+
+            // 缓存剩余不足2字节的数据
+            if (inlen > 0) {
+                Util.arrayCopyNonAtomic(in, currentInOff, this.buf, (short)0, inlen);
+                this.buflen = inlen;
+            }
         }
     }
 
     // 完成加密处理
-    public void finish(byte[] out) {
-        if (this == null || out == null) return;
+    public void finish(byte[] out, short outOff) {
+        if (out == null) return;
 
-        // 处理缓冲区中剩余的不足4字节数据
+        // 处理缓冲区中剩余的不足2字节数据
         if (this.buflen > 0) {
-            int keystream = zuc256GenerateKeyword(this.state);
-            byte[] keystreamBytes = new byte[4];
-            putU32(keystreamBytes, 0, keystream);
+            short keystream = zuc256GenerateKeyword(this.state);
+            byte[] keystreamBytes = JCSystem.makeTransientByteArray((short)2, JCSystem.CLEAR_ON_DESELECT);
+            putU16(keystreamBytes, (short)0, keystream);
 
             // 逐字节异或
-            for (int i = 0; i < this.buflen; i++) {
-                out[i] = (byte) (this.buf[i] ^ keystreamBytes[i]);
+            for (short i = 0; i < this.buflen; i++) {
+                out[(short)(outOff + i)] = (byte)(this.buf[i] ^ keystreamBytes[i]);
             }
         }
 
         // 清理上下文
-        Arrays.fill(this.buf, (byte) 0);
+        Util.arrayFillNonAtomic(this.buf, (short)0, (short)this.buf.length, (byte)0);
         this.buflen = 0;
-        Arrays.fill(this.state.LFSR, 0);
+        // 清理状态
+        Util.arrayFillNonAtomic(this.state.LFSR, (short)0, (short)this.state.LFSR.length, (short)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);
+    }
 }
diff --git a/Project/Src/com/cscn/Zuc256Tables.java b/Project/Src/com/cscn/Zuc256Tables.java
index 00a53c5..7d56ba9 100644
--- a/Project/Src/com/cscn/Zuc256Tables.java
+++ b/Project/Src/com/cscn/Zuc256Tables.java
@@ -3,9 +3,11 @@ package com.cscn;
 /**
  * 常量表：S0/S1 与 ZUC256_D。
  * 注意：JavaCard 目标环境建议将表定义为 static final 数组，按 int/short 存放。
+ * 适配说明：已将 32bit int 数组改为 16bit short 数组，符合JavaCard 16bit能力要求
  */
 public final class Zuc256Tables {
 
+    // 私有构造函数：防止类被实例化
     private Zuc256Tables() {}
 
     // S盒：S0, S1
@@ -48,7 +50,7 @@ public final class Zuc256Tables {
     };
 
     /**
-     * 常量数组 D
+     * 常量数组 D（16bit short二维数组适配）
      */
     public static final short[][] ZUC256_D = {
         {0x22,0x2F,0x24,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30},
@@ -56,4 +58,4 @@ public final class Zuc256Tables {
         {0x23,0x2F,0x24,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30},
         {0x23,0x2F,0x25,0x2A,0x6D,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x52,0x10,0x30}
     };
-}
+}
\ No newline at end of file
diff --git a/src/com/zuc/zuc256/Zuc256MacCtx.java b/src/com/zuc/zuc256/Zuc256MacCtx.java
new file mode 100644
index 0000000..47dc2ec
--- /dev/null
+++ b/src/com/zuc/zuc256/Zuc256MacCtx.java
@@ -0,0 +1,34 @@
+package com.zuc.zuc256;
+
+import javacard.framework.JCSystem;
+
+/**
+ * MAC上下文类（Java Card兼容版本）
+ */
+public final class Zuc256MacCtx {
+    // 所有32位int类型改为16位short类型，适应Java Card 16位处理能力
+    short[] LFSR;
+    short R1;
+    short R2;
+    byte[] buf;
+    short buflen;  // 长度变量使用short类型
+    short[] T;
+    short[] K0;
+    short macbits;  // MAC位数使用short类型
+
+    // 构造函数初始化瞬态数组，符合Java Card内存管理规范
+    public Zuc256MacCtx() {
+        // 使用瞬态内存存储敏感数据，提高安全性
+        // CLEAR_ON_DESELECT：卡片复位或选择其他应用时清除数据
+        LFSR = JCSystem.makeTransientShortArray((short)16, JCSystem.CLEAR_ON_DESELECT);
+        buf = JCSystem.makeTransientByteArray((short)4, JCSystem.CLEAR_ON_DESELECT);
+        T = JCSystem.makeTransientShortArray((short)4, JCSystem.CLEAR_ON_DESELECT);
+        K0 = JCSystem.makeTransientShortArray((short)4, JCSystem.CLEAR_ON_DESELECT);
+        
+        // 初始化变量
+        R1 = 0;
+        R2 = 0;
+        buflen = 0;
+        macbits = 0;
+    }
+}
diff --git a/src/com/zuc/zuc256/Zuc256State.java b/src/com/zuc/zuc256/Zuc256State.java
new file mode 100644
index 0000000..822fc4d
--- /dev/null
+++ b/src/com/zuc/zuc256/Zuc256State.java
@@ -0,0 +1,22 @@
+package com.zuc.zuc256;
+
+import javacard.framework.JCSystem;
+
+/**
+ * ZUC状态类（Java Card兼容版本）
+ */
+public final class Zuc256State {
+    // 适配Java Card 16位处理能力，将int改为short
+    short[] LFSR;  // 线性反馈移位寄存器
+    short R1;      // 寄存器1
+    short R2;      // 寄存器2
+
+    // 构造函数初始化瞬态数组
+    public Zuc256State() {
+        // 创建瞬态short数组，长度16，选择在卡片复位或切换应用时清除
+        LFSR = JCSystem.makeTransientShortArray((short)16, JCSystem.CLEAR_ON_DESELECT);
+        // 初始化寄存器值为0
+        R1 = 0;
+        R2 = 0;
+    }
+}