SM2 SM3 SM4加密java實現
【摘要】
本文主要講解“國密加密演算法”SM系列的Java實現方法，不涉及具體的演算法剖析，在網路上找到的java實現方法比較少，切在跨語言加密解密上會存在一些問題，所以整理此文志之。
原始碼下載地址http://download.csdn.net/detail/ererfei/9474502 需要C#實現SM系列演算法原始碼的可以評論留郵箱地址，看到後傳送
1.SM2 & SM3
由於SM2演算法中需要使用SM3摘要演算法，所以把他們放在一起
專案目錄結構如下：
首先要下載一個jar包——bcprov-jdk.jar，可以到maven庫中下載最新版http://central.maven.org/maven2/org/bouncycastle/並將該jar包引入專案的classpath。實現程式碼如下（每個工具類都有Main可以執行測試）：
a. SM2主類
【SM2.java】
package com.mlq.sm;
import java.math.BigInteger;
import java.security.SecureRandom;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECFieldElement;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.math.ec.ECFieldElement.Fp;
public class SM2
{
//測試引數
// public static final String[] ecc_param = {
// "8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
// "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
// "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
// "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
// "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
// "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
// };
//正式引數
public static String[] ecc_param = {
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",
"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",
"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",
"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
};
public static SM2 Instance()
{
return new SM2();
}
public final BigInteger ecc_p;
public final BigInteger ecc_a;
public final BigInteger ecc_b;
public final BigInteger ecc_n;
public final BigInteger ecc_gx;
public final BigInteger ecc_gy;
public final ECCurve ecc_curve;
public final ECPoint ecc_point_g;
public final ECDomainParameters ecc_bc_spec;
public final ECKeyPairGenerator ecc_key_pair_generator;
public final ECFieldElement ecc_gx_fieldelement;
public final ECFieldElement ecc_gy_fieldelement;
public SM2()
{
this.ecc_p = new BigInteger(ecc_param[0], 16);
this.ecc_a = new BigInteger(ecc_param[1], 16);
this.ecc_b = new BigInteger(ecc_param[2], 16);
this.ecc_n = new BigInteger(ecc_param[3], 16);
this.ecc_gx = new BigInteger(ecc_param[4], 16);
this.ecc_gy = new BigInteger(ecc_param[5], 16);
this.ecc_gx_fieldelement = new Fp(this.ecc_p, this.ecc_gx);
this.ecc_gy_fieldelement = new Fp(this.ecc_p, this.ecc_gy);
this.ecc_curve = new ECCurve.Fp(this.ecc_p, this.ecc_a, this.ecc_b);
this.ecc_point_g = new ECPoint.Fp(this.ecc_curve, this.ecc_gx_fieldelement, this.ecc_gy_fieldelement);
this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.ecc_n);
ECKeyGenerationParameters ecc_ecgenparam;
ecc_ecgenparam = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom());
this.ecc_key_pair_generator = new ECKeyPairGenerator();
this.ecc_key_pair_generator.init(ecc_ecgenparam);
}
}
b. SM2工具類
【SM2Utils.java】
package com.mlq.sm;
import java.io.IOException;
import java.math.BigInteger;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECPoint;
public class SM2Utils
{
//生成隨機祕鑰對
public static void generateKeyPair(){
SM2 sm2 = SM2.Instance();
AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair();
ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();
ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();
BigInteger privateKey = ecpriv.getD();
ECPoint publicKey = ecpub.getQ();
System.out.println("公鑰: " + Util.byteToHex(publicKey.getEncoded()));
System.out.println("私鑰: " + Util.byteToHex(privateKey.toByteArray()));
}
//資料加密
public static String encrypt(byte[] publicKey, byte[] data) throws IOException
{
if (publicKey == null || publicKey.length == 0)
{
return null;
}
if (data == null || data.length == 0)
{
return null;
}
byte[] source = new byte[data.length];
System.arraycopy(data, 0, source, 0, data.length);
Cipher cipher = new Cipher();
SM2 sm2 = SM2.Instance();
ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);
ECPoint c1 = cipher.Init_enc(sm2, userKey);
cipher.Encrypt(source);
byte[] c3 = new byte[32];
cipher.Dofinal(c3);
// System.out.println("C1 " + Util.byteToHex(c1.getEncoded()));
// System.out.println("C2 " + Util.byteToHex(source));
// System.out.println("C3 " + Util.byteToHex(c3));
//C1 C2 C3拼裝成加密字串
return Util.byteToHex(c1.getEncoded()) + Util.byteToHex(source) + Util.byteToHex(c3);
}
//資料解密
public static byte[] decrypt(byte[] privateKey, byte[] encryptedData) throws IOException
{
if (privateKey == null || privateKey.length == 0)
{
return null;
}
if (encryptedData == null || encryptedData.length == 0)
{
return null;
}
//加密位元組陣列轉換為十六進位制的字串 長度變為encryptedData.length * 2
String data = Util.byteToHex(encryptedData);
/***分解加密字串
* （C1 = C1標誌位2位 + C1實體部分128位 = 130）
* （C3 = C3實體部分64位 = 64）
* （C2 = encryptedData.length * 2 - C1長度 - C2長度）
*/
byte[] c1Bytes = Util.hexToByte(data.substring(0,130));
int c2Len = encryptedData.length - 97;
byte[] c2 = Util.hexToByte(data.substring(130,130 + 2 * c2Len));
byte[] c3 = Util.hexToByte(data.substring(130 + 2 * c2Len,194 + 2 * c2Len));
SM2 sm2 = SM2.Instance();
BigInteger userD = new BigInteger(1, privateKey);
//通過C1實體位元組來生成ECPoint
ECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes);
Cipher cipher = new Cipher();
cipher.Init_dec(userD, c1);
cipher.Decrypt(c2);
cipher.Dofinal(c3);
//返回解密結果
return c2;
}
public static void main(String[] args) throws Exception
{
//生成金鑰對
generateKeyPair();
String plainText = "ererfeiisgod";
byte[] sourceData = plainText.getBytes();
//下面的祕鑰可以使用generateKeyPair()生成的祕鑰內容
// 國密規範正式私鑰
String prik = "3690655E33D5EA3D9A4AE1A1ADD766FDEA045CDEAA43A9206FB8C430CEFE0D94";
// 國密規範正式公鑰
String pubk = "04F6E0C3345AE42B51E06BF50B98834988D54EBC7460FE135A48171BC0629EAE205EEDE253A530608178A98F1E19BB737302813BA39ED3FA3C51639D7A20C7391A";
System.out.println("加密: ");
String cipherText = SM2Utils.encrypt(Util.hexToByte(pubk), sourceData);
System.out.println(cipherText);
System.out.println("解密: ");
plainText = new String(SM2Utils.decrypt(Util.hexToByte(prik), Util.hexToByte(cipherText)));
System.out.println(plainText);
}
}
c. SM3主類
【SM3.java】
package com.mlq.sm;
public class SM3
{
public static final byte[] iv = { 0x73, (byte) 0x80, 0x16, 0x6f, 0x49,
0x14, (byte) 0xb2, (byte) 0xb9, 0x17, 0x24, 0x42, (byte) 0xd7,
(byte) 0xda, (byte) 0x8a, 0x06, 0x00, (byte) 0xa9, 0x6f, 0x30,
(byte) 0xbc, (byte) 0x16, 0x31, 0x38, (byte) 0xaa, (byte) 0xe3,
(byte) 0x8d, (byte) 0xee, 0x4d, (byte) 0xb0, (byte) 0xfb, 0x0e,
0x4e };
public static int[] Tj = new int[64];
static
{
for (int i = 0; i < 16; i++)
{
Tj[i] = 0x79cc4519;
}
for (int i = 16; i < 64; i++)
{
Tj[i] = 0x7a879d8a;
}
}
public static byte[] CF(byte[] V, byte[] B)
{
int[] v, b;
v = convert(V);
b = convert(B);
return convert(CF(v, b));
}
private static int[] convert(byte[] arr)
{
int[] out = new int[arr.length / 4];
byte[] tmp = new byte[4];
for (int i = 0; i < arr.length; i += 4)
{
System.arraycopy(arr, i, tmp, 0, 4);
out[i / 4] = bigEndianByteToInt(tmp);
}
return out;
}
private static byte[] convert(int[] arr)
{
byte[] out = new byte[arr.length * 4];
byte[] tmp = null;
for (int i = 0; i < arr.length; i++)
{
tmp = bigEndianIntToByte(arr[i]);
System.arraycopy(tmp, 0, out, i * 4, 4);
}
return out;
}
public static int[] CF(int[] V, int[] B)
{
int a, b, c, d, e, f, g, h;
int ss1, ss2, tt1, tt2;
a = V[0];
b = V[1];
c = V[2];
d = V[3];
e = V[4];
f = V[5];
g = V[6];
h = V[7];
int[][] arr = expand(B);
int[] w = arr[0];
int[] w1 = arr[1];
for (int j = 0; j < 64; j++)
{
ss1 = (bitCycleLeft(a, 12) + e + bitCycleLeft(Tj[j], j));
ss1 = bitCycleLeft(ss1, 7);
ss2 = ss1 ^ bitCycleLeft(a, 12);
tt1 = FFj(a, b, c, j) + d + ss2 + w1[j];
tt2 = GGj(e, f, g, j) + h + ss1 + w[j];
d = c;
c = bitCycleLeft(b, 9);
b = a;
a = tt1;
h = g;
g = bitCycleLeft(f, 19);
f = e;
e = P0(tt2);
/*System.out.print(j+" ");
System.out.print(Integer.toHexString(a)+" ");
System.out.print(Integer.toHexString(b)+" ");
System.out.print(Integer.toHexString(c)+" ");
System.out.print(Integer.toHexString(d)+" ");
System.out.print(Integer.toHexString(e)+" ");
System.out.print(Integer.toHexString(f)+" ");
System.out.print(Integer.toHexString(g)+" ");
System.out.print(Integer.toHexString(h)+" ");
System.out.println("");*/
}
// System.out.println("");
int[] out = new int[8];
out[0] = a ^ V[0];
out[1] = b ^ V[1];
out[2] = c ^ V[2];
out[3] = d ^ V[3];
out[4] = e ^ V[4];
out[5] = f ^ V[5];
out[6] = g ^ V[6];
out[7] = h ^ V[7];
return out;
}
private static int[][] expand(int[] B)
{
int W[] = new int[68];
int W1[] = new int[64];
for (int i = 0; i < B.length; i++)
{
W[i] = B[i];
}
for (int i = 16; i < 68; i++)
{
W[i] = P1(W[i - 16] ^ W[i - 9] ^ bitCycleLeft(W[i - 3], 15))
^ bitCycleLeft(W[i - 13], 7) ^ W[i - 6];
}
for (int i = 0; i < 64; i++)
{
W1[i] = W[i] ^ W[i + 4];
}
int arr[][] = new int[][] { W, W1 };
return arr;
}
private static byte[] bigEndianIntToByte(int num)
{
return back(Util.intToBytes(num));
}
private static int bigEndianByteToInt(byte[] bytes)
{
return Util.byteToInt(back(bytes));
}
private static int FFj(int X, int Y, int Z, int j)
{
if (j >= 0 && j <= 15)
{
return FF1j(X, Y, Z);
}
else
{
return FF2j(X, Y, Z);
}
}
private static int GGj(int X, int Y, int Z, int j)
{
if (j >= 0 && j <= 15)
{
return GG1j(X, Y, Z);
}
else
{
return GG2j(X, Y, Z);
}
}
// 邏輯位運算函式
private static int FF1j(int X, int Y, int Z)
{
int tmp = X ^ Y ^ Z;
return tmp;
}
private static int FF2j(int X, int Y, int Z)
{
int tmp = ((X & Y) | (X & Z) | (Y & Z));
return tmp;
}
private static int GG1j(int X, int Y, int Z)
{
int tmp = X ^ Y ^ Z;
return tmp;
}
private static int GG2j(int X, int Y, int Z)
{
int tmp = (X & Y) | (~X & Z);
return tmp;
}
private static int P0(int X)
{
int y = rotateLeft(X, 9);
y = bitCycleLeft(X, 9);
int z = rotateLeft(X, 17);
z = bitCycleLeft(X, 17);
int t = X ^ y ^ z;
return t;
}
private static int P1(int X)
{
int t = X ^ bitCycleLeft(X, 15) ^ bitCycleLeft(X, 23);
return t;
}
/**
* 對最後一個分組位元組資料padding
*
* @param in
* @param bLen
* 分組個數
* @return
*/
public static byte[] padding(byte[] in, int bLen)
{
int k = 448 - (8 * in.length + 1) % 512;
if (k < 0)
{
k = 960 - (8 * in.length + 1) % 512;
}
k += 1;
byte[] padd = new byte[k / 8];
padd[0] = (byte) 0x80;
long n = in.length * 8 + bLen * 512;
byte[] out = new byte[in.length + k / 8 + 64 / 8];
int pos = 0;
System.arraycopy(in, 0, out, 0, in.length);
pos += in.length;
System.arraycopy(padd, 0, out, pos, padd.length);
pos += padd.length;
byte[] tmp = back(Util.longToBytes(n));
System.arraycopy(tmp, 0, out, pos, tmp.length);
return out;
}
/**
* 位元組陣列逆序
*
* @param in
* @return
*/
private static byte[] back(byte[] in)
{
byte[] out = new byte[in.length];
for (int i = 0; i < out.length; i++)
{
out[i] = in[out.length - i - 1];
}
return out;
}
public static int rotateLeft(int x, int n)
{
return (x << n) | (x >> (32 - n));
}
private static int bitCycleLeft(int n, int bitLen)
{
bitLen %= 32;
byte[] tmp = bigEndianIntToByte(n);
int byteLen = bitLen / 8;
int len = bitLen % 8;
if (byteLen > 0)
{
tmp = byteCycleLeft(tmp, byteLen);
}
if (len > 0)
{
tmp = bitSmall8CycleLeft(tmp, len);
}
return bigEndianByteToInt(tmp);
}
private static byte[] bitSmall8CycleLeft(byte[] in, int len)
{
byte[] tmp = new byte[in.length];
int t1, t2, t3;
for (int i = 0; i < tmp.length; i++)
{
t1 = (byte) ((in[i] & 0x000000ff) << len);
t2 = (byte) ((in[(i + 1) % tmp.length] & 0x000000ff) >> (8 - len));
t3 = (byte) (t1 | t2);
tmp[i] = (byte) t3;
}
return tmp;
}
private static byte[] byteCycleLeft(byte[] in, int byteLen)
{
byte[] tmp = new byte[in.length];
System.arraycopy(in, byteLen, tmp, 0, in.length - byteLen);
System.arraycopy(in, 0, tmp, in.length - byteLen, byteLen);
return tmp;
}
}
d. SM3工具類
【SM3Digest.java】
package com.mlq.sm;
import org.bouncycastle.util.encoders.Hex;
public class SM3Digest
{
/** SM3值的長度 */
private static final int BYTE_LENGTH = 32;
/** SM3分組長度 */
private static final int BLOCK_LENGTH = 64;
/** 緩衝區長度 */
private static final int BUFFER_LENGTH = BLOCK_LENGTH * 1;
/** 緩衝區 */
private byte[] xBuf = new byte[BUFFER_LENGTH];
/** 緩衝區偏移量 */
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結果輸出
*
* @param out 儲存SM3結構的緩衝區
* @param outOff 緩衝區偏移量
* @return
*/
public int doFinal(byte[] out, int outOff)
{
byte[] tmp = doFinal();
System.arraycopy(tmp, 0, out, 0, tmp.length);
return BYTE_LENGTH;
}
public void reset()
{
xBufOff = 0;
cntBlock = 0;
V = SM3.iv.clone();
}
/**
* 明文輸入
*
* @param in
* 明文輸入緩衝區
* @param inOff
* 緩衝區偏移量
* @param len
* 明文長度
*/
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;
}
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;
}
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;
}
public static void main(String[] args)
{
byte[] md = new byte[32];
byte[] msg1 = "ererfeiisgod".getBytes();
SM3Digest sm3 = new SM3Digest();
sm3.update(msg1, 0, msg1.length);
sm3.doFinal(md, 0);
String s = new String(Hex.encode(md));
System.out.println(s.toUpperCase());
}
}
e. 工具類
【Util.java】
package com.mlq.sm;
import java.math.BigInteger;
public class Util
{
/**
* 整形轉換成網路傳輸的位元組流（位元組陣列）型資料
*
* @param num 一個整型資料
* @return 4個位元組的自己陣列
*/
public static byte[] intToBytes(int num)
{
byte[] bytes = new byte[4];
bytes[0] = (byte) (0xff & (num >> 0));
bytes[1] = (byte) (0xff & (num >> 8));
bytes[2] = (byte) (0xff & (num >> 16));
bytes[3] = (byte) (0xff & (num >> 24));
return bytes;
}
/**
* 四個位元組的位元組資料轉換成一個整形資料
*
* @param bytes 4個位元組的位元組陣列
* @return 一個整型資料
*/
public static int byteToInt(byte[] bytes)
{
int num = 0;
int temp;
temp = (0x000000ff & (bytes[0])) << 0;
num = num | temp;
temp = (0x000000ff & (bytes[1])) << 8;
num = num | temp;
temp = (0x000000ff & (bytes[2])) << 16;
num = num | temp;
temp = (0x000000ff & (bytes[3])) << 24;
num = num | temp;
return num;
}
/**
* 長整形轉換成網路傳輸的位元組流（位元組陣列）型資料
*
* @param num 一個長整型資料
* @return 4個位元組的自己陣列
*/
public static byte[] longToBytes(long num)
{
byte[] bytes = new byte[8];
for (int i = 0; i < 8; i++)
{
bytes[i] = (byte) (0xff & (num >> (i * 8)));
}
return bytes;
}
/**
* 大數字轉換位元組流（位元組陣列）型資料
*
* @param n
* @return
*/
public static byte[] byteConvert32Bytes(BigInteger n)
{
byte tmpd[] = (byte[])null;
if(n == null)
{
return null;
}
if(n.toByteArray().length == 33)
{
tmpd = new byte[32];
System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);
}
else if(n.toByteArray().length == 32)
{
tmpd = n.toByteArray();
}
else
{
tmpd = new byte[32];
for(int i = 0; i < 32 - n.toByteArray().length; i++)
{
tmpd[i] = 0;
}
System.arraycopy(n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length);
}
return tmpd;
}
/**
* 換位元組流（位元組陣列）型資料轉大數字
*
* @param b
* @return
*/
public static BigInteger byteConvertInteger(byte[] b)
{
if (b[0] < 0)
{
byte[] temp = new byte[b.length + 1];
temp[0] = 0;
System.arraycopy(b, 0, temp, 1, b.length);
return new BigInteger(temp);
}
return new BigInteger(b);
}
/**
* 根據位元組陣列獲得值(十六進位制數字)
*
* @param bytes
* @return
*/
public static String getHexString(byte[] bytes)
{
return getHexString(bytes, true);
}
/**
* 根據位元組陣列獲得值(十六進位制數字)
*
* @param bytes
* @param upperCase
* @return
*/
public static String getHexString(byte[] bytes, boolean upperCase)
{
String ret = "";
for (int i = 0; i < bytes.length; i++)
{
ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);
}
return upperCase ? ret.toUpperCase() : ret;
}
/**
* 列印十六進位制字串
*
* @param bytes
*/
public static void printHexString(byte[] bytes)
{
for (int i = 0; i < bytes.length; i++)
{
String hex = Integer.toHexString(bytes[i] & 0xFF);
if (hex.length() == 1)
{
hex = '0' + hex;
}
System.out.print("0x" + hex.toUpperCase() + ",");
}
System.out.println("");
}
/**
* Convert hex string to byte[]
*
* @param hexString
* the hex string
* @return byte[]
*/
public static byte[] hexStringToBytes(String hexString)
{
if (hexString == null || hexString.equals(""))
{
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++)
{
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
/**
* Convert char to byte
*
* @param c
* char
* @return byte
*/
public static byte charToByte(char c)
{
return (byte) "0123456789ABCDEF".indexOf(c);
}
/**
* 用於建立十六進位制字元的輸出的小寫字元陣列
*/
private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
/**
* 用於建立十六進位制字元的輸出的大寫字元陣列
*/
private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
/**
* 將位元組陣列轉換為十六進位制字元陣列
*
* @param data byte[]
* @return 十六進位制char[]
*/
public static char[] encodeHex(byte[] data) {
return encodeHex(data, true);
}
/**
* 將位元組陣列轉換為十六進位制字元陣列
*
* @param data byte[]
* @param toLowerCase <code>true</code> 傳換成小寫格式 ， <code>false</code> 傳換成大寫格式
* @return 十六進位制char[]
*/
public static char[] encodeHex(byte[] data, boolean toLowerCase) {
return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
/**
* 將位元組陣列轉換為十六進位制字元陣列
*
* @param data byte[]
* @param toDigits 用於控制輸出的char[]
* @return 十六進位制char[]
*/
protected static char[] encodeHex(byte[] data, char[] toDigits) {
int l = data.length;
char[] out = new char[l << 1];
// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
out[j++] = toDigits[0x0F & data[i]];
}
return out;
}
/**
* 將位元組陣列轉換為十六進位制字串
*
* @param data byte[]
* @return 十六進位制String
*/
public static String encodeHexString(byte[] data) {
return encodeHexString(data, true);
}
/**
* 將位元組陣列轉換為十六進位制字串
*
* @param data byte[]
* @param toLowerCase <code>true</code> 傳換成小寫格式 ， <code>false</code> 傳換成大寫格式
* @return 十六進位制String
*/
public static String encodeHexString(byte[] data, boolean toLowerCase) {
return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
/**
* 將位元組陣列轉換為十六進位制字串
*
* @param data byte[]
* @param toDigits 用於控制輸出的char[]
* @return 十六進位制String
*/
protected static String encodeHexString(byte[] data, char[] toDigits) {
return new String(encodeHex(data, toDigits));
}
/**
* 將十六進位制字元陣列轉換為位元組陣列
*
* @param data 十六進位制char[]
* @return byte[]
* @throws RuntimeException 如果源十六進位制字元陣列是一個奇怪的長度，將丟擲執行時異常
*/
public static byte[] decodeHex(char[] data) {
int len = data.length;
if ((len & 0x01) != 0) {
throw new RuntimeException("Odd number of characters.");
}
byte[] out = new byte[len >> 1];
// two characters form the hex value.
for (int i = 0, j = 0; j < len; i++) {
int f = toDigit(data[j], j) << 4;
j++;
f = f | toDigit(data[j], j);
j++;
out[i] = (byte) (f & 0xFF);
}
return out;
}
/**
* 將十六進位制字元轉換成一個整數
*
* @param ch 十六進位制char
* @param index 十六進位制字元在字元陣列中的位置
* @return 一個整數
* @throws RuntimeException 當ch不是一個合法的十六進位制字元時，丟擲執行時異常
*/
protected static int toDigit(char ch, int index) {
int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new RuntimeException("Illegal hexadecimal character " + ch
+ " at index " + index);
}
return digit;
}
/**
* 數字字串轉ASCII碼字串
*
* @param String
* 字串
* @return ASCII字串
*/
public static String StringToAsciiString(String content) {
String result = "";
int max = content.length();
for (int i = 0; i < max; i++) {
char c = content.charAt(i);
String b = Integer.toHexString(c);
result = result + b;
}
return result;
}
/**
* 十六進位制轉字串
*
* @param hexString
* 十六進位制字串
* @param encodeType
* 編碼型別4：Unicode，2：普通編碼
* @return 字串
*/
public static String hexStringToString(String hexString, int encodeType) {
String result = "";
int max = hexString.length() / encodeType;
for (int i = 0; i < max; i++) {
char c = (char) hexStringToAlgorism(hexString
.substring(i * encodeType, (i + 1) * encodeType));
result += c;
}
return result;
}
/**
* 十六進位制字串裝十進位制
*
* @param hex
* 十六進位制字串
* @return 十進位制數值
*/
public static int hexStringToAlgorism(String hex) {
hex = hex.toUpperCase();
int max = hex.length();
int result = 0;
for (int i = max; i > 0; i--) {
char c = hex.charAt(i - 1);
int algorism = 0;
if (c >= '0' && c <= '9') {
algorism = c - '0';
} else {
algorism = c - 55;
}
result += Math.pow(16, max - i) * algorism;
}
return result;
}
/**
* 十六轉二進位制
*
* @param hex
* 十六進位制字串
* @return 二進位制字串
*/
public static String hexStringToBinary(String hex) {
hex = hex.toUpperCase();
String result = "";
int max = hex.length();
for (int i = 0; i < max; i++) {
char c = hex.charAt(i);
switch (c) {
case '0':
result += "0000";
break;
case '1':
result += "0001";
break;
case '2':
result += "0010";
break;
case '3':
result += "0011";
break;
case '4':
result += "0100";
break;
case '5':
result += "0101";
break;
case '6':
result += "0110";
break;
case '7':
result += "0111";
break;
case '8':
result += "1000";
break;
case '9':
result += "1001";
break;
case 'A':
result += "1010";
break;
case 'B':
result += "1011";
break;
case 'C':
result += "1100";
break;
case 'D':
result += "1101";
break;
case 'E':
result += "1110";
break;
case 'F':
result += "1111";
break;
}
}
return result;
}
/**
* ASCII碼字串轉數字字串
*
* @param String
* ASCII字串
* @return 字串
*/
public static String AsciiStringToString(String content) {
String result = "";
int length = content.length() / 2;
for (int i = 0; i < length; i++) {
String c = content.substring(i * 2, i * 2 + 2);
int a = hexStringToAlgorism(c);
char b = (char) a;
String d = String.valueOf(b);
result += d;
}
return result;
}
/**
* 將十進位制轉換為指定長度的十六進位制字串
*
* @param algorism
* int 十進位制數字
* @param maxLength
* int 轉換後的十六進位制字串長度
* @return String 轉換後的十六進位制字串
*/
public static String algorismToHexString(int algorism, int maxLength) {
String result = "";
result = Integer.toHexString(algorism);
if (result.length() % 2 == 1) {
result = "0" + result;
}
return patchHexString(result.toUpperCase(), maxLength);
}
/**
* 位元組陣列轉為普通字串（ASCII對應的字元）
*
* @param bytearray
* byte[]
* @return String
*/
public static String byteToString(byte[] bytearray) {
String result = "";
char temp;
int length = bytearray.length;
for (int i = 0; i < length; i++) {
temp = (char) bytearray[i];
result += temp;
}
return result;
}
/**
* 二進位制字串轉十進位制
*
* @param binary
* 二進位制字串
* @return 十進位制數值
*/
public static int binaryToAlgorism(String binary) {
int max = binary.length();
int result = 0;
for (int i = max; i > 0; i--) {
char c = binary.charAt(i - 1);
int algorism = c - '0';
result += Math.pow(2, max - i) * algorism;
}
return result;
}
/**
* 十進位制轉換為十六進位制字串
*
* @param algorism
* int 十進位制的數字
* @return String 對應的十六進位制字串
*/
public static String algorismToHEXString(int algorism) {
String result = "";
result = Integer.toHexString(algorism);
if (result.length() % 2 == 1) {
result = "0" + result;
}
result = result.toUpperCase();
return result;
}
/**
* HEX字串前補0，主要用於長度位數不足。
*
* @param str
* String 需要補充長度的十六進位制字串
* @param maxLength
* int 補充後十六進位制字串的長度
* @return 補充結果
*/
static public String patchHexString(String str, int maxLength) {
String temp = "";
for (int i = 0; i < maxLength - str.length(); i++) {
temp = "0" + temp;
}
str = (temp + str).substring(0, maxLength);
return str;
}
/**
* 將一個字串轉換為int
*
* @param s
* String 要轉換的字串
* @param defaultInt
* int 如果出現異常,預設返回的數字
* @param radix
* int 要轉換的字串是什麼進位制的,如16 8 10.
* @return int 轉換後的數字
*/
public static int parseToInt(String s, int defaultInt, int radix) {
int i = 0;
try {
i = Integer.parseInt(s, radix);
} catch (NumberFormatException ex) {
i = defaultInt;
}
return i;
}
/**
* 將一個十進位制形式的數字字串轉換為int
*
* @param s
* String 要轉換的字串
* @param defaultInt
* int 如果出現異常,預設返回的數字
* @return int 轉換後的數字
*/
public static int parseToInt(String s, int defaultInt) {
int i = 0;
try {
i = Integer.parseInt(s);
} catch (NumberFormatException ex) {
i = defaultInt;
}
return i;
}
/**
* 十六進位制串轉化為byte陣列
*
* @return the array of byte
*/
public static byte[] hexToByte(String hex)
throws IllegalArgumentException {
if (hex.length() % 2 != 0) {
throw new IllegalArgumentException();
}
char[] arr = hex.toCharArray();
byte[] b = new byte[hex.length() / 2];
for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
String swap = "" + arr[i++] + arr[i];
int byteint = Integer.parseInt(swap, 16) & 0xFF;
b[j] = new Integer(byteint).byteValue();
}
return b;
}
/**
* 位元組陣列轉換為十六進位制字串
*
* @param b
* byte[] 需要轉換的位元組陣列
* @return String 十六進位制字串
*/
public static String byteToHex(byte b[]) {
if (b == null) {
throw new IllegalArgumentException(
"Argument b ( byte array ) is null! ");
}
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0xff);
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
}
}
return hs.toUpperCase();
}
public static byte[] subByte(byte[] input, int startIndex, int length) {
byte[] bt = new byte[length];
for (int i = 0; i < length; i++) {
bt[i] = input[i + startIndex];
}
return bt;
}
}
f. Chiper類
package com.mlq.sm;
import java.math.BigInteger;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECPoint;
public class Cipher
{
private int ct;
private ECPoint p2;
private SM3Digest sm3keybase;
private SM3Digest sm3c3;
private byte key[];
private byte keyOff;
public Cipher()
{
this.ct = 1;
this.key = new byte[32];
this.keyOff = 0;
}
private void Reset()
{
this.sm3keybase = new SM3Digest();
this.sm3c3 = new SM3Digest();
byte p[] = Util.byteConvert32Bytes(p2.getX().toBigInteger());
this.sm3keybase.update(p, 0, p.length);
this.sm3c3.update(p, 0, p.length);
p = Util.byteConvert32Bytes(p2.getY().toBigInteger());
this.sm3keybase.update(p, 0, p.length);
this.ct = 1;
NextKey();
}
private void NextKey()
{
SM3Digest sm3keycur = new SM3Digest(this.sm3keybase);
sm3keycur.update((byte) (ct >> 24 & 0xff));
sm3keycur.update((byte) (ct >> 16 & 0xff));
sm3keycur.update((byte) (ct >> 8 & 0xff));
sm3keycur.update((byte) (ct & 0xff));
sm3keycur.doFinal(key, 0);
this.keyOff = 0;
this.ct++;
}
public ECPoint Init_enc(SM2 sm2, ECPoint userKey)
{
AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair();
ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();
ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();
BigInteger k = ecpriv.getD();
ECPoint c1 = ecpub.getQ();
this.p2 = userKey.multiply(k);
Reset();
return c1;
}
public void Encrypt(byte data[])
{
this.sm3c3.update(data, 0, data.length);
for (int i = 0; i < data.length; i++)
{
if (keyOff == key.length)
{
NextKey();
}
data[i] ^= key[keyOff++];
}
}
public void Init_dec(BigInteger userD, ECPoint c1)
{
this.p2 = c1.multiply(userD);
Reset();
}
public void Decrypt(byte data[])
{
for (int i = 0; i < data.length; i++)
{
if (keyOff == key.length)
{
NextKey();
}
data[i] ^= key[keyOff++];
}
this.sm3c3.update(data, 0, data.length);
}
public void Dofinal(byte c3[])
{
byte p[] = Util.byteConvert32Bytes(p2.getY().toBigInteger());
this.sm3c3.update(p, 0, p.length);
this.sm3c3.doFinal(c3, 0);