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com.egzosn.pay.common.util.sign.encrypt.sm3.SM3Digest Maven / Gradle / Ivy
package com.egzosn.pay.common.util.sign.encrypt.sm3;
public class SM3Digest {
/** SM3值的长度 */
private static final int BYTE_LENGTH = 32;
/** SM3分组长度 */
private static final int BLOCK_LENGTH = 64;
/** 缓冲区长度 */
private static final int BUFFER_LENGTH = BLOCK_LENGTH * 1;
/** 缓冲区 */
private byte[] xBuf = new byte[BUFFER_LENGTH];
/** 缓冲区偏移量 */
private int xBufOff;
/** 初始向量 */
private byte[] V = SM3.iv.clone();
private int cntBlock = 0;
public SM3Digest() {
}
public SM3Digest(SM3Digest t){
System.arraycopy(t.xBuf, 0, this.xBuf, 0, t.xBuf.length);
this.xBufOff = t.xBufOff;
System.arraycopy(t.V, 0, this.V, 0, t.V.length);
}
/**
* SM3结果输出
*
* @param out 保存SM3结构的缓冲区
* @param outOff 缓冲区偏移量
* @return 字节长度
*/
public int doFinal(byte[] out, int outOff)
{
byte[] tmp = doFinal();
System.arraycopy(tmp, 0, out, 0, tmp.length);
return BYTE_LENGTH;
}
/**
* 重置
*/
public void reset()
{
xBufOff = 0;
cntBlock = 0;
V = SM3.iv.clone();
}
/**
* 明文输入
*
* @param in 明文输入缓冲区
* @param inOff 缓冲区偏移量
* @param len 明文长度
*/
public void update(byte[] in, int inOff, int len)
{
int partLen = BUFFER_LENGTH - xBufOff;
int inputLen = len;
int dPos = inOff;
if (partLen < inputLen)
{
System.arraycopy(in, dPos, xBuf, xBufOff, partLen);
inputLen -= partLen;
dPos += partLen;
doUpdate();
while (inputLen > BUFFER_LENGTH)
{
System.arraycopy(in, dPos, xBuf, 0, BUFFER_LENGTH);
inputLen -= BUFFER_LENGTH;
dPos += BUFFER_LENGTH;
doUpdate();
}
}
System.arraycopy(in, dPos, xBuf, xBufOff, inputLen);
xBufOff += inputLen;
}
/**
* 更新
*/
private void doUpdate()
{
byte[] B = new byte[BLOCK_LENGTH];
for (int i = 0; i < BUFFER_LENGTH; i += BLOCK_LENGTH)
{
System.arraycopy(xBuf, i, B, 0, B.length);
doHash(B);
}
xBufOff = 0;
}
/**
* 转16进制
* @param B 字节数组
*/
private void doHash(byte[] B)
{
byte[] tmp = SM3.CF(V, B);
System.arraycopy(tmp, 0, V, 0, V.length);
cntBlock++;
}
private byte[] doFinal()
{
byte[] B = new byte[BLOCK_LENGTH];
byte[] buffer = new byte[xBufOff];
System.arraycopy(xBuf, 0, buffer, 0, buffer.length);
byte[] tmp = SM3.padding(buffer, cntBlock);
for (int i = 0; i < tmp.length; i += BLOCK_LENGTH)
{
System.arraycopy(tmp, i, B, 0, B.length);
doHash(B);
}
return V;
}
public void update(byte in)
{
byte[] buffer = new byte[] { in };
update(buffer, 0, 1);
}
public int getDigestSize()
{
return BYTE_LENGTH;
}
}