bcprov-jdk15on实现例子
Maven依赖:
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.54</version>
</dependency>
Java实现如下:
import java.math.BigInteger;
import java.security.SecureRandom;
import java.util.Arrays;
import org.bouncycastle.crypto.DerivationFunction;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.digests.ShortenedDigest;
import org.bouncycastle.crypto.generators.KDF1BytesGenerator;
import org.bouncycastle.crypto.params.ISO18033KDFParameters;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
/**
* <B>说 明<B/>:SM2的非对称加解密工具类，椭圆曲线方程为：y^2=x^3+ax+b 使用Fp-256
*/
public class SM2Util {
/** 素数p */
private static final BigInteger p = new BigInteger("FFFFFFFE" + "FFFFFFFF"
+ "FFFFFFFF" + "FFFFFFFF" + "FFFFFFFF" + "00000000" + "FFFFFFFF"
+ "FFFFFFFF", 16);
/** 系数a */
private static final BigInteger a = new BigInteger("FFFFFFFE" + "FFFFFFFF"
+ "FFFFFFFF" + "FFFFFFFF" + "FFFFFFFF" + "00000000" + "FFFFFFFF"
+ "FFFFFFFC", 16);
/** 系数b */
private static final BigInteger b = new BigInteger("28E9FA9E" + "9D9F5E34"
+ "4D5A9E4B" + "CF6509A7" + "F39789F5" + "15AB8F92" + "DDBCBD41"
+ "4D940E93", 16);
/** 坐标x */
private static final BigInteger xg = new BigInteger("32C4AE2C" + "1F198119"
+ "5F990446" + "6A39C994" + "8FE30BBF" + "F2660BE1" + "715A4589"
+ "334C74C7", 16);
/** 坐标y */
private static final BigInteger yg = new BigInteger("BC3736A2" + "F4F6779C"
+ "59BDCEE3" + "6B692153" + "D0A9877C" + "C62A4740" + "02DF32E5"
+ "2139F0A0", 16);
/** 基点G, G=(xg,yg),其介记为n */
private static final BigInteger n = new BigInteger("FFFFFFFE" + "FFFFFFFF"
+ "FFFFFFFF" + "FFFFFFFF" + "7203DF6B" + "21C6052B" + "53BBF409"
+ "39D54123", 16);
private static SecureRandom random = new SecureRandom();
private ECCurve.Fp curve;
private ECPoint G;
public static String printHexString(byte[] b) {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < b.length; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
builder.append('0'+hex);
hex = '0' + hex;
}
// System.out.print(hex.toUpperCase());
System.out.print(hex.toUpperCase());
builder.append(hex);
}
System.out.println();
return builder.toString();
}
public BigInteger random(BigInteger max) {
BigInteger r = new BigInteger(256, random);
// int count = 1;
while (r.compareTo(max) >= 0) {
r = new BigInteger(128, random);
// count++;
}
// System.out.println("count: " + count);
return r;
}
private boolean allZero(byte[] buffer) {
for (int i = 0; i < buffer.length; i++) {
if (buffer[i] != 0)
return false;
}
return true;
}
/**
* 加密
* @param input 待加密消息M
* @param publicKey 公钥
* @return byte[] 加密后的字节数组
*/
public byte[] encrypt(String input, ECPoint publicKey) {
System.out.println("publicKey is: "+publicKey);
byte[] inputBuffer = input.getBytes();
printHexString(inputBuffer);
/* 1 产生随机数k，k属于[1, n-1] */
BigInteger k = random(n);
System.out.print("k: ");
printHexString(k.toByteArray());
/* 2 计算椭圆曲线点C1 = [k]G = (x1, y1) */
ECPoint C1 = G.multiply(k);
byte[] C1Buffer = C1.getEncoded(false);
System.out.print("C1: ");
printHexString(C1Buffer);
// 3 计算椭圆曲线点 S = [h]Pb * curve没有指定余因子，h为空
// BigInteger h = curve.getCofactor(); System.out.print("h: ");
// printHexString(h.toByteArray()); if (publicKey != null) { ECPoint
// result = publicKey.multiply(h); if (!result.isInfinity()) {
// System.out.println("pass"); } else {
// System.err.println("计算椭圆曲线点 S = [h]Pb失败"); return null; } }
/* 4 计算 [k]PB = (x2, y2) */
ECPoint kpb = publicKey.multiply(k).normalize();
/* 5 计算 t = KDF(x2||y2, klen) */
byte[] kpbBytes = kpb.getEncoded(false);
DerivationFunction kdf = new KDF1BytesGenerator(new ShortenedDigest(
new SHA256Digest(), 20));
byte[] t = new byte[inputBuffer.length];
kdf.init(new ISO18033KDFParameters(kpbBytes));
kdf.generateBytes(t, 0, t.length);
if (allZero(t)) {
System.err.println("all zero");
}
/* 6 计算C2=M^t */
byte[] C2 = new byte[inputBuffer.length];
for (int i = 0; i < inputBuffer.length; i++) {
C2[i] = (byte) (inputBuffer[i] ^ t[i]);
}
/* 7 计算C3 = Hash(x2 || M || y2) */
byte[] C3 = calculateHash(kpb.getXCoord().toBigInteger(), inputBuffer,
kpb.getYCoord().toBigInteger());
/* 8 输出密文 C=C1 || C2 || C3 */
byte[] encryptResult = new byte[C1Buffer.length + C2.length + C3.length];
System.arraycopy(C1Buffer, 0, encryptResult, 0, C1Buffer.length);
System.arraycopy(C2, 0, encryptResult, C1Buffer.length, C2.length);
System.arraycopy(C3, 0, encryptResult, C1Buffer.length + C2.length,
C3.length);
System.out.print("密文: ");
printHexString(encryptResult);
return encryptResult;
}
public void decrypt(byte[] encryptData, BigInteger privateKey) {
System.out.println("privateKey is: "+privateKey);
System.out.println("encryptData length: " + encryptData.length);
byte[] C1Byte = new byte[65];
System.arraycopy(encryptData, 0, C1Byte, 0, C1Byte.length);
ECPoint C1 = curve.decodePoint(C1Byte).normalize();
/* 计算[dB]C1 = (x2, y2) */
ECPoint dBC1 = C1.multiply(privateKey).normalize();
/* 计算t = KDF(x2 || y2, klen) */
byte[] dBC1Bytes = dBC1.getEncoded(false);
DerivationFunction kdf = new KDF1BytesGenerator(new ShortenedDigest(
new SHA256Digest(), 20));
int klen = encryptData.length - 65 - 20;
System.out.println("klen = " + klen);
byte[] t = new byte[klen];
kdf.init(new ISO18033KDFParameters(dBC1Bytes));
kdf.generateBytes(t, 0, t.length);
if (allZero(t)) {
System.err.println("all zero");
}
/* 5 计算M'=C2^t */
byte[] M = new byte[klen];
for (int i = 0; i < M.length; i++) {
M[i] = (byte) (encryptData[C1Byte.length + i] ^ t[i]);
}
/* 6 计算 u = Hash(x2 || M' || y2) 判断 u == C3是否成立 */
byte[] C3 = new byte[20];
System.arraycopy(encryptData, encryptData.length - 20, C3, 0, 20);
byte[] u = calculateHash(dBC1.getXCoord().toBigInteger(), M, dBC1
.getYCoord().toBigInteger());
if (Arrays.equals(u, C3)) {
System.out.println("解密成功");
System.out.println("M' = " + new String(M));
} else {
System.out.print("u = ");
printHexString(u);
System.out.print("C3 = ");
printHexString(C3);
System.err.println("解密验证失败");
}
}
private byte[] calculateHash(BigInteger x2, byte[] M, BigInteger y2) {
ShortenedDigest digest = new ShortenedDigest(new SHA256Digest(), 20);
byte[] buf = x2.toByteArray();
digest.update(buf, 0, buf.length);
digest.update(M, 0, M.length);
buf = y2.toByteArray();
digest.update(buf, 0, buf.length);
buf = new byte[20];
digest.doFinal(buf, 0);
return buf;
}
private boolean between(BigInteger param, BigInteger min, BigInteger max) {
if (param.compareTo(min) >= 0 && param.compareTo(max) < 0) {
return true;
} else {
return false;
}
}
/**
* 公钥校验
* @param publicKey 公钥
* @return boolean true或false
*/
private boolean checkPublicKey(ECPoint publicKey) {
if (!publicKey.isInfinity()) {
BigInteger x = publicKey.getXCoord().toBigInteger();
BigInteger y = publicKey.getYCoord().toBigInteger();
if (between(x, new BigInteger("0"), p) && between(y, new BigInteger("0"), p)) {
BigInteger xResult = x.pow(3).add(a.multiply(x)).add(b).mod(p);
System.out.println("xResult: " + xResult.toString());
BigInteger yResult = y.pow(2).mod(p);
System.out.println("yResult: " + yResult.toString());
if (yResult.equals(xResult) && publicKey.multiply(n).isInfinity()) {
return true;
}
}
return false;
} else {
return false;
}
}
/**
* 获得公私钥对
* @return
*/
public SM2KeyPair generateKeyPair() {
BigInteger d = random(n.subtract(new BigInteger("1")));
SM2KeyPair keyPair = new SM2KeyPair(G.multiply(d).normalize(), d);
if (checkPublicKey(keyPair.getPublicKey())) {
System.out.println("generate key successfully");
return keyPair;
} else {
System.err.println("generate key failed");
return null;
}
}
public SM2Util() {
curve = new ECCurve.Fp(p, // q
a, // a
b); // b
G = curve.createPoint(xg, yg);
}
}
import java.math.BigInteger;
import org.bouncycastle.math.ec.ECPoint;
/**
* <B>说 明<B/>:SM2公私钥实体类
*/
public class SM2KeyPair {
/** 公钥 */
private ECPoint publicKey;
/** 私钥 */
private BigInteger privateKey;
SM2KeyPair(ECPoint publicKey, BigInteger privateKey) {
this.publicKey = publicKey;
this.privateKey = privateKey;
}
public ECPoint getPublicKey() {
return publicKey;
}
public BigInteger getPrivateKey() {
return privateKey;
}
}
import java.util.Arrays;
/**
* <B>说 明<B/>:SM2非对称加解密工具类测试
*/
public class SM2UtilTest {
/** 元消息串 */
private static String M = "哈哈哈，&*&…………&、、//\\!@#$%^&*()物品woyebuzhidaowozijiqiaodesha!@#$%^&*())))))ooooooooppppppppppppppppppplllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkffffffffffffffffffffffffffffffffffffff";
public static void main(String[] args) {
SM2Util sm2 = new SM2Util();
SM2KeyPair keyPair = sm2.generateKeyPair();
byte[] data = sm2.encrypt(M,keyPair.getPublicKey());
System.out.println("data is:"+Arrays.toString(data));
sm2.decrypt(data, keyPair.getPrivateKey());//71017045908707391874054405929626258767106914144911649587813342322113806533034
}
}
bcprov-jdk16实现例子
<dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcprov-jdk16</artifactId> <version>1.46</version> </dependency>
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECPoint;
import java.math.BigInteger;
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);
Reset();
}
}
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);
}
}
// 逻辑位运算函数
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;
}
/**
* 对最后一个分组字节数据padding
*
* @param in
* @param bLen 分组个数
* @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;
}
/**
* 字节数组逆序
*
* @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;
}
}
import org.bouncycastle.util.encoders.Hex;
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);
}
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());
}
/**
* 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
*/
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;
}
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;
}
}
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.ECFieldElement.Fp;
import org.bouncycastle.math.ec.ECPoint;
import java.math.BigInteger;
import java.security.SecureRandom;
public class SM2 {
//测试参数
// public static final String[] ecc_param = {
// "8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
// "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
// "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
// "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
// "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
// "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
// };
//正式参数
public static String[] ecc_param = {
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",
"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",
"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",
"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",
"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
};
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);
}
public static SM2 Instance() {
return new SM2();
}
}
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECPoint;
import java.io.IOException;
import java.math.BigInteger;
public class SM2Utils {
//生成随机秘钥对
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("公钥: " + Util.byteToHex(publicKey.getEncoded()));
System.out.println("私钥: " + Util.byteToHex(privateKey.toByteArray()));
}
//数据加密
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拼装成加密字串
return Util.byteToHex(c1.getEncoded()) + Util.byteToHex(source) + Util.byteToHex(c3);
}
//数据解密
//c3InFront 硬件为了方便加解密数据，把定长的C3放在变长的C2前面，由默认的C1C2C3调整成C1C3C2的格式
public static byte[] decrypt(byte[] privateKey, byte[] encryptedData, boolean c3InFront) throws IOException {
if (privateKey == null || privateKey.length == 0) {
return null;
}
if (encryptedData == null || encryptedData.length == 0) {
return null;
}
//加密字节数组转换为十六进制的字符串 长度变为encryptedData.length * 2
String data = Util.byteToHex(encryptedData);
/***分解加密字串
* （C1 = C1标志位2位 + C1实体部分128位 = 130）
* （C3 = C3实体部分64位 = 64）
* （C2 = encryptedData.length * 2 - C1长度 - C2长度）
*/
byte[] c1Bytes = Util.hexToByte(data.substring(0, 130));
byte[] c2;
byte[] c3;
if (c3InFront) {
c3 = Util.hexToByte(data.substring(130, 64));
c2 = Util.hexToByte(data.substring(130 + 64));
} else {
/***C1 || C2 || C3 的意思就是拼在一起，而不是做什么或运算
*
* 根据国密推荐的SM2椭圆曲线公钥密码算法，首先产生随机数计算出曲线点C1，
* 2个32byte的BIGNUM大数，即为SM2加密结果的第1部分（C1）。
* 第2部分则是真正的密文，是对明文的加密结果，长度和明文一样（C2）。
* 第3部分是杂凑值，用来效验数据（C3）。按国密推荐的256位椭圆曲线，
* 明文加密结果比原长度会大97byte（C1使用EC_POINT_point2oct转换）。
*
*/
int c2Len = encryptedData.length - 97;
c2 = Util.hexToByte(data.substring(130, 130 + 2 * c2Len));
c3 = Util.hexToByte(data.substring(130 + 2 * c2Len, 194 + 2 * c2Len));
}
SM2 sm2 = SM2.Instance();
BigInteger userD = new BigInteger(1, privateKey);
//通过C1实体字节来生成ECPoint
ECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes);
Cipher cipher = new Cipher();
cipher.Init_dec(userD, c1);
cipher.Decrypt(c2);
cipher.doFinal(c3);
//返回解密结果
return c2;
}
public static void main(String[] args) throws Exception {
//生成密钥对
generateKeyPair();
String plainText = "ererfeiisgod";
byte[] sourceData = plainText.getBytes();
//下面的秘钥可以使用generateKeyPair()生成的秘钥内容
// 国密规范正式私钥
String prik = "3690655E33D5EA3D9A4AE1A1ADD766FDEA045CDEAA43A9206FB8C430CEFE0D94";
// 国密规范正式公钥
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), false));
System.out.println(plainText);
}
}
import java.math.BigInteger;
public class Util {
/**
* 用于建立十六进制字符的输出的小写字符数组
*/
private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
/**
* 用于建立十六进制字符的输出的大写字符数组
*/
private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
/**
* 整形转换成网络传输的字节流（字节数组）型数据
*
* @param num 一个整型数据
* @return 4个字节的自己数组
*/
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;
}
/**
* 四个字节的字节数据转换成一个整形数据
*
* @param bytes 4个字节的字节数组
* @return 一个整型数据
*/
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;
}
/**
* 长整形转换成网络传输的字节流（字节数组）型数据
*
* @param num 一个长整型数据
* @return 4个字节的自己数组
*/
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;
}
/**
* 大数字转换字节流（字节数组）型数据
*
* @param n
* @return
*/
public static byte[] byteConvert32Bytes(BigInteger n) {
byte[] tmpd = 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;
}
/**
* 换字节流（字节数组）型数据转大数字
*
* @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);
}
/**
* 根据字节数组获得值(十六进制数字)
*
* @param bytes
* @return
*/
public static String getHexString(byte[] bytes) {
return getHexString(bytes, true);
}
/**
* 根据字节数组获得值(十六进制数字)
*
* @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;
}
/**
* 打印十六进制字符串
*
* @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);
}
/**
* 将字节数组转换为十六进制字符数组
*
* @param data byte[]
* @return 十六进制char[]
*/
public static char[] encodeHex(byte[] data) {
return encodeHex(data, true);
}
/**
* 将字节数组转换为十六进制字符数组
*
* @param data byte[]
* @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
* @return 十六进制char[]
*/
public static char[] encodeHex(byte[] data, boolean toLowerCase) {
return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
/**
* 将字节数组转换为十六进制字符数组
*
* @param data byte[]
* @param toDigits 用于控制输出的char[]
* @return 十六进制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;
}
/**
* 将字节数组转换为十六进制字符串
*
* @param data byte[]
* @return 十六进制String
*/
public static String encodeHexString(byte[] data) {
return encodeHexString(data, true);
}
/**
* 将字节数组转换为十六进制字符串
*
* @param data byte[]
* @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
* @return 十六进制String
*/
public static String encodeHexString(byte[] data, boolean toLowerCase) {
return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
/**
* 将字节数组转换为十六进制字符串
*
* @param data byte[]
* @param toDigits 用于控制输出的char[]
* @return 十六进制String
*/
protected static String encodeHexString(byte[] data, char[] toDigits) {
return new String(encodeHex(data, toDigits));
}
/**
* 将十六进制字符数组转换为字节数组
*
* @param data 十六进制char[]
* @return byte[]
* @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常
*/
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;
}
/**
* 将十六进制字符转换成一个整数
*
* @param ch 十六进制char
* @param index 十六进制字符在字符数组中的位置
* @return 一个整数
* @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常
*/
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;
}
/**
* 数字字符串转ASCII码字符串
*
* @param content 字符串
* @return ASCII字符串
*/
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;
}
/**
* 十六进制转字符串
*
* @param hexString 十六进制字符串
* @param encodeType 编码类型4：Unicode，2：普通编码
* @return 字符串
*/
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;
}
/**
* 十六进制字符串装十进制
*
* @param hex 十六进制字符串
* @return 十进制数值
*/
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;
}
/**
* 十六转二进制
*
* @param hex 十六进制字符串
* @return 二进制字符串
*/
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码字符串转数字字符串
*
* @param content ASCII字符串
* @return 字符串
*/
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;
}
/**
* 将十进制转换为指定长度的十六进制字符串
*
* @param algorism int 十进制数字
* @param maxLength int 转换后的十六进制字符串长度
* @return String 转换后的十六进制字符串
*/
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);
}
/**
* 字节数组转为普通字符串（ASCII对应的字符）
*
* @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;
}
/**
* 二进制字符串转十进制
*
* @param binary 二进制字符串
* @return 十进制数值
*/
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;
}
/**
* 十进制转换为十六进制字符串
*
* @param algorism int 十进制的数字
* @return String 对应的十六进制字符串
*/
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字符串前补0，主要用于长度位数不足。
*
* @param str String 需要补充长度的十六进制字符串
* @param maxLength int 补充后十六进制字符串的长度
* @return 补充结果
*/
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;
}
/**
* 将一个字符串转换为int
*
* @param s String 要转换的字符串
* @param defaultInt int 如果出现异常,默认返回的数字
* @param radix int 要转换的字符串是什么进制的,如16 8 10.
* @return int 转换后的数字
*/
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;
}
/**
* 将一个十进制形式的数字字符串转换为int
*
* @param s String 要转换的字符串
* @param defaultInt int 如果出现异常,默认返回的数字
* @return int 转换后的数字
*/
public static int parseToInt(String s, int defaultInt) {
int i = 0;
try {
i = Integer.parseInt(s);
} catch (NumberFormatException ex) {
i = defaultInt;
}
return i;
}
/**
* 十六进制串转化为byte数组
*
* @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;
}
/**
* 字节数组转换为十六进制字符串
*
* @param b byte[] 需要转换的字节数组
* @return String 十六进制字符串
*/
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;
}
}
注意：
- 根据国密推荐的SM2椭圆曲线公钥密码算法，首先产生随机数计算出曲线点C1，2个32byte的BIGNUM大数，即为SM2加密结果的第1部分（C1）。第2部分则是真正的密文，是对明文的加密结果，长度和明文一样（C2）。第3部分是杂凑值，用来效验数据（C3）。按国密推荐的256位椭圆曲线，明文加密结果比原长度会大97byte（C1使用EC_POINT_point2oct转换）。
我们可以利用 密文，长度和明文一样（C2）这个原理，来跟踪现实中的调试问题，我们在没办法解密用户输入数据的内容的情况下，可以知道用户输入内容的长度，也能辅助我们解决很多调试问题。
上述的代码还可参考 Java—bouncycastle支持国密SM2的公钥加密算法