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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.crypto;
import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.crypto.asymmetric.SM2;
import cn.hutool.crypto.digest.HMac;
import cn.hutool.crypto.digest.HmacAlgorithm;
import cn.hutool.crypto.digest.SM3;
import cn.hutool.crypto.digest.mac.BCHMacEngine;
import cn.hutool.crypto.digest.mac.MacEngine;
import cn.hutool.crypto.symmetric.SM4;
import cn.hutool.crypto.symmetric.SymmetricCrypto;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.signers.StandardDSAEncoding;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.PrivateKey;
import java.security.PublicKey;
/**
* SM国密算法工具类
* 此工具类依赖org.bouncycastle:bcprov-jdk15to18
*
* 封装包括：
*
* - SM2 椭圆曲线非对称加密和签名
* - SM3 杂凑算法
* - SM4 对称加密
*
*
* @author looly
* @since 4.3.2
*/
public class SmUtil {
private final static int RS_LEN = 32;
/**
* SM2默认曲线
*/
public static final String SM2_CURVE_NAME = "sm2p256v1";
/**
* SM2推荐曲线参数（来自https://github.com/ZZMarquis/gmhelper）
*/
public static final ECDomainParameters SM2_DOMAIN_PARAMS = BCUtil.toDomainParams(GMNamedCurves.getByName(SM2_CURVE_NAME));
/**
* SM2国密算法公钥参数的Oid标识
*/
public static final ASN1ObjectIdentifier ID_SM2_PUBLIC_KEY_PARAM = new ASN1ObjectIdentifier("1.2.156.10197.1.301");
/**
* 创建SM2算法对象
* 生成新的私钥公钥对
*
* @return {@link SM2}
*/
public static SM2 sm2() {
return new SM2();
}
/**
* 创建SM2算法对象
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKeyStr 私钥Hex或Base64表示
* @param publicKeyStr 公钥Hex或Base64表示
* @return {@link SM2}
*/
public static SM2 sm2(String privateKeyStr, String publicKeyStr) {
return new SM2(privateKeyStr, publicKeyStr);
}
/**
* 创建SM2算法对象
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKey 私钥，必须使用PKCS#8规范
* @param publicKey 公钥，必须使用X509规范
* @return {@link SM2}
*/
public static SM2 sm2(byte[] privateKey, byte[] publicKey) {
return new SM2(privateKey, publicKey);
}
/**
* 创建SM2算法对象
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKey 私钥
* @param publicKey 公钥
* @return {@link SM2}
* @since 5.5.9
*/
public static SM2 sm2(PrivateKey privateKey, PublicKey publicKey) {
return new SM2(privateKey, publicKey);
}
/**
* 创建SM2算法对象
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKeyParams 私钥参数
* @param publicKeyParams 公钥参数
* @return {@link SM2}
* @since 5.5.9
*/
public static SM2 sm2(ECPrivateKeyParameters privateKeyParams, ECPublicKeyParameters publicKeyParams) {
return new SM2(privateKeyParams, publicKeyParams);
}
/**
* SM3加密
* 例：
* SM3加密：sm3().digest(data)
* SM3加密并转为16进制字符串：sm3().digestHex(data)
*
* @return {@link SM3}
*/
public static SM3 sm3() {
return new SM3();
}
/**
* SM3加密，可以传入盐
*
* @param salt 加密盐
* @return {@link SM3}
* @since 5.7.16
*/
public static SM3 sm3WithSalt(byte[] salt) {
return new SM3(salt);
}
/**
* SM3加密，生成16进制SM3字符串
*
* @param data 数据
* @return SM3字符串
*/
public static String sm3(String data) {
return sm3().digestHex(data);
}
/**
* SM3加密，生成16进制SM3字符串
*
* @param data 数据
* @return SM3字符串
*/
public static String sm3(InputStream data) {
return sm3().digestHex(data);
}
/**
* SM3加密文件，生成16进制SM3字符串
*
* @param dataFile 被加密文件
* @return SM3字符串
*/
public static String sm3(File dataFile) {
return sm3().digestHex(dataFile);
}
/**
* SM4加密，生成随机KEY。注意解密时必须使用相同 {@link SymmetricCrypto}对象或者使用相同KEY
* 例：
*
*
* SM4加密：sm4().encrypt(data)
* SM4解密：sm4().decrypt(data)
*
*
* @return {@link SymmetricCrypto}
*/
public static SM4 sm4() {
return new SM4();
}
/**
* SM4加密
* 例：
*
*
* SM4加密：sm4(key).encrypt(data)
* SM4解密：sm4(key).decrypt(data)
*
*
* @param key 密钥
* @return {@link SM4}
*/
public static SM4 sm4(byte[] key) {
return new SM4(key);
}
/**
* bc加解密使用旧标c1||c2||c3，此方法在加密后调用，将结果转化为c1||c3||c2
*
* @param c1c2c3 加密后的bytes，顺序为C1C2C3
* @param ecDomainParameters {@link ECDomainParameters}
* @return 加密后的bytes，顺序为C1C3C2
*/
public static byte[] changeC1C2C3ToC1C3C2(byte[] c1c2c3, ECDomainParameters ecDomainParameters) {
// sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。
final int c1Len = (ecDomainParameters.getCurve().getFieldSize() + 7) / 8 * 2 + 1;
final int c3Len = 32; // new SM3Digest().getDigestSize();
byte[] result = new byte[c1c2c3.length];
System.arraycopy(c1c2c3, 0, result, 0, c1Len); // c1
System.arraycopy(c1c2c3, c1c2c3.length - c3Len, result, c1Len, c3Len); // c3
System.arraycopy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.length - c1Len - c3Len); // c2
return result;
}
/**
* bc加解密使用旧标c1||c3||c2，此方法在解密前调用，将密文转化为c1||c2||c3再去解密
*
* @param c1c3c2 加密后的bytes，顺序为C1C3C2
* @param ecDomainParameters {@link ECDomainParameters}
* @return c1c2c3 加密后的bytes，顺序为C1C2C3
*/
public static byte[] changeC1C3C2ToC1C2C3(byte[] c1c3c2, ECDomainParameters ecDomainParameters) {
// sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。
final int c1Len = (ecDomainParameters.getCurve().getFieldSize() + 7) / 8 * 2 + 1;
final int c3Len = 32; // new SM3Digest().getDigestSize();
byte[] result = new byte[c1c3c2.length];
System.arraycopy(c1c3c2, 0, result, 0, c1Len); // c1: 0->65
System.arraycopy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.length - c1Len - c3Len); // c2
System.arraycopy(c1c3c2, c1Len, result, c1c3c2.length - c3Len, c3Len); // c3
return result;
}
/**
* BC的SM3withSM2签名得到的结果的rs是asn1格式的，这个方法转化成直接拼接r||s
*
* @param rsDer rs in asn1 format
* @return sign result in plain byte array
* @since 4.5.0
*/
public static byte[] rsAsn1ToPlain(byte[] rsDer) {
final BigInteger[] decode;
try {
decode = StandardDSAEncoding.INSTANCE.decode(SM2_DOMAIN_PARAMS.getN(), rsDer);
} catch (IOException e) {
throw new IORuntimeException(e);
}
final byte[] r = bigIntToFixedLengthBytes(decode[0]);
final byte[] s = bigIntToFixedLengthBytes(decode[1]);
return ArrayUtil.addAll(r, s);
}
/**
* BC的SM3withSM2验签需要的rs是asn1格式的，这个方法将直接拼接r||s的字节数组转化成asn1格式
*
* @param sign in plain byte array
* @return rs result in asn1 format
* @since 4.5.0
*/
public static byte[] rsPlainToAsn1(byte[] sign) {
if (sign.length != RS_LEN * 2) {
throw new CryptoException("err rs. ");
}
BigInteger r = new BigInteger(1, Arrays.copyOfRange(sign, 0, RS_LEN));
BigInteger s = new BigInteger(1, Arrays.copyOfRange(sign, RS_LEN, RS_LEN * 2));
try {
return StandardDSAEncoding.INSTANCE.encode(SM2_DOMAIN_PARAMS.getN(), r, s);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 创建HmacSM3算法的{@link MacEngine}
*
* @param key 密钥
* @return {@link MacEngine}
* @since 4.5.13
*/
public static MacEngine createHmacSm3Engine(byte[] key) {
return new BCHMacEngine(new SM3Digest(), key);
}
/**
* HmacSM3算法实现
*
* @param key 密钥
* @return {@link HMac} 对象，调用digestXXX即可
* @since 4.5.13
*/
public static HMac hmacSm3(byte[] key) {
return new HMac(HmacAlgorithm.HmacSM3, key);
}
// -------------------------------------------------------------------------------------------------------- Private method start
/**
* BigInteger转固定长度bytes
*
* @param rOrS {@link BigInteger}
* @return 固定长度bytes
* @since 4.5.0
*/
private static byte[] bigIntToFixedLengthBytes(BigInteger rOrS) {
// for sm2p256v1, n is 00fffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123,
// r and s are the result of mod n, so they should be less than n and have length<=32
byte[] rs = rOrS.toByteArray();
if (rs.length == RS_LEN) {
return rs;
} else if (rs.length == RS_LEN + 1 && rs[0] == 0) {
return Arrays.copyOfRange(rs, 1, RS_LEN + 1);
} else if (rs.length < RS_LEN) {
byte[] result = new byte[RS_LEN];
Arrays.fill(result, (byte) 0);
System.arraycopy(rs, 0, result, RS_LEN - rs.length, rs.length);
return result;
} else {
throw new CryptoException("Error rs: {}", Hex.toHexString(rs));
}
}
// -------------------------------------------------------------------------------------------------------- Private method end
}
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