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package cn.hutool.crypto.asymmetric;

import cn.hutool.core.lang.Assert;
import cn.hutool.core.util.HexUtil;
import cn.hutool.crypto.BCUtil;
import cn.hutool.crypto.CryptoException;
import cn.hutool.crypto.ECKeyUtil;
import cn.hutool.crypto.SecureUtil;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithID;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.DSAEncoding;
import org.bouncycastle.crypto.signers.PlainDSAEncoding;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.crypto.signers.StandardDSAEncoding;
import org.bouncycastle.util.BigIntegers;
import org.bouncycastle.util.encoders.Hex;

import java.math.BigInteger;
import java.security.PrivateKey;
import java.security.PublicKey;

/**
 * 国密SM2非对称算法实现,基于BC库
* SM2算法只支持公钥加密,私钥解密
* 参考:https://blog.csdn.net/pridas/article/details/86118774 * *

* 国密算法包括: *

    *
  1. 非对称加密和签名:SM2
  2. *
  3. 摘要签名算法:SM3
  4. *
  5. 对称加密:SM4
  6. *
* * @author looly * @since 4.3.2 */ public class SM2 extends AbstractAsymmetricCrypto { private static final long serialVersionUID = 1L; /** * 算法EC */ private static final String ALGORITHM_SM2 = "SM2"; protected SM2Engine engine; protected SM2Signer signer; private ECPrivateKeyParameters privateKeyParams; private ECPublicKeyParameters publicKeyParams; private DSAEncoding encoding = StandardDSAEncoding.INSTANCE; private Digest digest = new SM3Digest(); private SM2Engine.Mode mode = SM2Engine.Mode.C1C3C2; // ------------------------------------------------------------------ Constructor start /** * 构造,生成新的私钥公钥对 */ public SM2() { this(null, (byte[]) null); } /** * 构造
* 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,必须使用PKCS#8规范 * @param publicKeyStr 公钥Hex或Base64表示,必须使用X509规范 */ public SM2(String privateKeyStr, String publicKeyStr) { this(SecureUtil.decode(privateKeyStr), SecureUtil.decode(publicKeyStr)); } /** * 构造
* 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,可以使用PKCS#8、D值或PKCS#1规范 * @param publicKey 公钥,可以使用X509、Q值或PKCS#1规范 */ public SM2(byte[] privateKey, byte[] publicKey) { this( ECKeyUtil.decodePrivateKeyParams(privateKey), ECKeyUtil.decodePublicKeyParams(publicKey) ); } /** * 构造
* 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 */ public SM2(PrivateKey privateKey, PublicKey publicKey) { this(BCUtil.toParams(privateKey), BCUtil.toParams(publicKey)); if (null != privateKey) { this.privateKey = privateKey; } if (null != publicKey) { this.publicKey = publicKey; } } /** * 构造
* 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 privateKeyHex 私钥16进制 * @param publicKeyPointXHex 公钥X16进制 * @param publicKeyPointYHex 公钥Y16进制 * @since 5.2.0 */ public SM2(String privateKeyHex, String publicKeyPointXHex, String publicKeyPointYHex) { this(BCUtil.toSm2Params(privateKeyHex), BCUtil.toSm2Params(publicKeyPointXHex, publicKeyPointYHex)); } /** * 构造
* 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 publicKeyPointX 公钥X * @param publicKeyPointY 公钥Y * @since 5.2.0 */ public SM2(byte[] privateKey, byte[] publicKeyPointX, byte[] publicKeyPointY) { this(BCUtil.toSm2Params(privateKey), BCUtil.toSm2Params(publicKeyPointX, publicKeyPointY)); } /** * 构造
* 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,可以为null * @param publicKeyParams 公钥,可以为null */ public SM2(ECPrivateKeyParameters privateKeyParams, ECPublicKeyParameters publicKeyParams) { super(ALGORITHM_SM2, null, null); this.privateKeyParams = privateKeyParams; this.publicKeyParams = publicKeyParams; this.init(); } // ------------------------------------------------------------------ Constructor end /** * 初始化
* 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(签名)或者解密(校验) * * @return this */ public SM2 init() { if (null == this.privateKeyParams && null == this.publicKeyParams) { super.initKeys(); this.privateKeyParams = BCUtil.toParams(this.privateKey); this.publicKeyParams = BCUtil.toParams(this.publicKey); } return this; } @Override public SM2 initKeys() { // 阻断父类中自动生成密钥对的操作,此操作由本类中进行。 // 由于用户可能传入Params而非key,因此此时key必定为null,故此不再生成 return this; } // --------------------------------------------------------------------------------- Encrypt /** * 使用公钥加密,SM2非对称加密的结果由C1,C3,C2三部分组成,其中: * *
	 * C1 生成随机数的计算出的椭圆曲线点
	 * C3 SM3的摘要值
	 * C2 密文数据
	 * 
* * @param data 被加密的bytes * @return 加密后的bytes * @throws CryptoException 包括InvalidKeyException和InvalidCipherTextException的包装异常 * @since 5.7.10 */ public byte[] encrypt(byte[] data) throws CryptoException { return encrypt(data, KeyType.PublicKey); } /** * 加密,SM2非对称加密的结果由C1,C3,C2三部分组成,其中: * *
	 * C1 生成随机数的计算出的椭圆曲线点
	 * C3 SM3的摘要值
	 * C2 密文数据
	 * 
* * @param data 被加密的bytes * @param keyType 私钥或公钥 {@link KeyType} * @return 加密后的bytes * @throws CryptoException 包括InvalidKeyException和InvalidCipherTextException的包装异常 */ @Override public byte[] encrypt(byte[] data, KeyType keyType) throws CryptoException { if (KeyType.PublicKey != keyType) { throw new IllegalArgumentException("Encrypt is only support by public key"); } return encrypt(data, new ParametersWithRandom(getCipherParameters(keyType))); } /** * 加密,SM2非对称加密的结果由C1,C2,C3三部分组成,其中: * *
	 * C1 生成随机数的计算出的椭圆曲线点
	 * C2 密文数据
	 * C3 SM3的摘要值
	 * 
* * @param data 被加密的bytes * @param pubKeyParameters 公钥参数 * @return 加密后的bytes * @throws CryptoException 包括InvalidKeyException和InvalidCipherTextException的包装异常 * @since 5.1.6 */ public byte[] encrypt(byte[] data, CipherParameters pubKeyParameters) throws CryptoException { lock.lock(); final SM2Engine engine = getEngine(); try { engine.init(true, pubKeyParameters); return engine.processBlock(data, 0, data.length); } catch (InvalidCipherTextException e) { throw new CryptoException(e); } finally { lock.unlock(); } } // --------------------------------------------------------------------------------- Decrypt /** * 使用私钥解密 * * @param data SM2密文,实际包含三部分:ECC公钥、真正的密文、公钥和原文的SM3-HASH值 * @return 加密后的bytes * @throws CryptoException 包括InvalidKeyException和InvalidCipherTextException的包装异常 * @since 5.7.10 */ public byte[] decrypt(byte[] data) throws CryptoException { return decrypt(data, KeyType.PrivateKey); } /** * 解密 * * @param data SM2密文,实际包含三部分:ECC公钥、真正的密文、公钥和原文的SM3-HASH值 * @param keyType 私钥或公钥 {@link KeyType} * @return 加密后的bytes * @throws CryptoException 包括InvalidKeyException和InvalidCipherTextException的包装异常 */ @Override public byte[] decrypt(byte[] data, KeyType keyType) throws CryptoException { if (KeyType.PrivateKey != keyType) { throw new IllegalArgumentException("Decrypt is only support by private key"); } return decrypt(data, getCipherParameters(keyType)); } /** * 解密 * * @param data SM2密文,实际包含三部分:ECC公钥、真正的密文、公钥和原文的SM3-HASH值 * @param privateKeyParameters 私钥参数 * @return 加密后的bytes * @throws CryptoException 包括InvalidKeyException和InvalidCipherTextException的包装异常 * @since 5.1.6 */ public byte[] decrypt(byte[] data, CipherParameters privateKeyParameters) throws CryptoException { lock.lock(); final SM2Engine engine = getEngine(); try { engine.init(false, privateKeyParameters); return engine.processBlock(data, 0, data.length); } catch (InvalidCipherTextException e) { throw new CryptoException(e); } finally { lock.unlock(); } } // --------------------------------------------------------------------------------- Sign and Verify /** * 用私钥对信息生成数字签名 * * @param dataHex 被签名的数据数据 * @return 签名 */ public String signHex(String dataHex) { return signHex(dataHex, null); } /** * 用私钥对信息生成数字签名,签名格式为ASN1
* * 在硬件签名中,返回结果为R+S,可以通过调用{@link cn.hutool.crypto.SmUtil#rsAsn1ToPlain(byte[])}方法转换之。 * * @param data 加密数据 * @return 签名 */ public byte[] sign(byte[] data) { return sign(data, null); } /** * 用私钥对信息生成数字签名 * * @param dataHex 被签名的数据数据 * @param idHex 可以为null,若为null,则默认withId为字节数组:"1234567812345678".getBytes() * @return 签名 */ public String signHex(String dataHex, String idHex) { return HexUtil.encodeHexStr(sign(HexUtil.decodeHex(dataHex), HexUtil.decodeHex(idHex))); } /** * 用私钥对信息生成数字签名,签名格式为ASN1
* 在硬件签名中,返回结果为R+S,可以通过调用{@link cn.hutool.crypto.SmUtil#rsAsn1ToPlain(byte[])}方法转换之。 * * @param data 被签名的数据数据 * @param id 可以为null,若为null,则默认withId为字节数组:"1234567812345678".getBytes() * @return 签名 */ public byte[] sign(byte[] data, byte[] id) { lock.lock(); final SM2Signer signer = getSigner(); try { CipherParameters param = new ParametersWithRandom(getCipherParameters(KeyType.PrivateKey)); if (id != null) { param = new ParametersWithID(param, id); } signer.init(true, param); signer.update(data, 0, data.length); return signer.generateSignature(); } catch (org.bouncycastle.crypto.CryptoException e) { throw new CryptoException(e); } finally { lock.unlock(); } } /** * 用公钥检验数字签名的合法性 * * @param dataHex 的数据 * @param signHex 签名 * @return 是否验证通过 * @since 5.2.0 */ public boolean verifyHex(String dataHex, String signHex) { return verifyHex(dataHex, signHex, null); } /** * 用公钥检验数字签名的合法性 * * @param data 数据 * @param sign 签名 * @return 是否验证通过 */ public boolean verify(byte[] data, byte[] sign) { return verify(data, sign, null); } /** * 用公钥检验数字签名的合法性 * * @param dataHex 数据的Hex值 * @param signHex 签名的Hex值 * @param idHex ID的Hex值 * @return 是否验证通过 * @since 5.2.0 */ public boolean verifyHex(String dataHex, String signHex, String idHex) { return verify(HexUtil.decodeHex(dataHex), HexUtil.decodeHex(signHex), HexUtil.decodeHex(idHex)); } /** * 用公钥检验数字签名的合法性 * * @param data 数据 * @param sign 签名 * @param id 可以为null,若为null,则默认withId为字节数组:"1234567812345678".getBytes() * @return 是否验证通过 */ public boolean verify(byte[] data, byte[] sign, byte[] id) { lock.lock(); final SM2Signer signer = getSigner(); try { CipherParameters param = getCipherParameters(KeyType.PublicKey); if (id != null) { param = new ParametersWithID(param, id); } signer.init(false, param); signer.update(data, 0, data.length); return signer.verifySignature(sign); } finally { lock.unlock(); } } @Override public SM2 setPrivateKey(PrivateKey privateKey) { super.setPrivateKey(privateKey); // 重新初始化密钥参数,防止重新设置密钥时导致密钥无法更新 this.privateKeyParams = BCUtil.toParams(privateKey); return this; } /** * 设置私钥参数 * * @param privateKeyParams 私钥参数 * @return this * @since 5.2.0 */ public SM2 setPrivateKeyParams(ECPrivateKeyParameters privateKeyParams) { this.privateKeyParams = privateKeyParams; return this; } @Override public SM2 setPublicKey(PublicKey publicKey) { super.setPublicKey(publicKey); // 重新初始化密钥参数,防止重新设置密钥时导致密钥无法更新 this.publicKeyParams = BCUtil.toParams(publicKey); return this; } /** * 设置公钥参数 * * @param publicKeyParams 公钥参数 * @return this */ public SM2 setPublicKeyParams(ECPublicKeyParameters publicKeyParams) { this.publicKeyParams = publicKeyParams; return this; } /** * 设置DSA signatures的编码为PlainDSAEncoding * * @return this * @since 5.3.1 */ public SM2 usePlainEncoding() { return setEncoding(PlainDSAEncoding.INSTANCE); } /** * 设置DSA signatures的编码 * * @param encoding {@link DSAEncoding}实现 * @return this * @since 5.3.1 */ public SM2 setEncoding(DSAEncoding encoding) { this.encoding = encoding; this.signer = null; return this; } /** * 设置Hash算法 * * @param digest {@link Digest}实现 * @return this * @since 5.3.1 */ public SM2 setDigest(Digest digest) { this.digest = digest; this.engine = null; this.signer = null; return this; } /** * 设置SM2模式,旧版是C1C2C3,新版本是C1C3C2 * * @param mode {@link SM2Engine.Mode} * @return this */ public SM2 setMode(SM2Engine.Mode mode) { this.mode = mode; this.engine = null; return this; } /** * 获得私钥D值(编码后的私钥) * * @return D值 * @since 5.5.9 */ public byte[] getD() { return BigIntegers.asUnsignedByteArray(32,getDBigInteger()); } /** * 获得私钥D值(编码后的私钥) * * @return D值 * @since 5.7.17 */ public String getDHex() { return new String(Hex.encode(getD())); } /** * 获得私钥D值 * * @return D值 * @since 5.7.17 */ public BigInteger getDBigInteger() { return this.privateKeyParams.getD(); } /** * 获得公钥Q值(编码后的公钥) * * @param isCompressed 是否压缩 * @return Q值 * @since 5.5.9 */ public byte[] getQ(boolean isCompressed) { return this.publicKeyParams.getQ().getEncoded(isCompressed); } // ------------------------------------------------------------------------------------------------------------------------- Private method start /** * 获取密钥类型对应的加密参数对象{@link CipherParameters} * * @param keyType Key类型枚举,包括私钥或公钥 * @return {@link CipherParameters} */ private CipherParameters getCipherParameters(KeyType keyType) { switch (keyType) { case PublicKey: Assert.notNull(this.publicKeyParams, "PublicKey must be not null !"); return this.publicKeyParams; case PrivateKey: Assert.notNull(this.privateKeyParams, "PrivateKey must be not null !"); return this.privateKeyParams; } return null; } /** * 获取{@link SM2Engine},此对象为懒加载模式 * * @return {@link SM2Engine} */ private SM2Engine getEngine() { if (null == this.engine) { Assert.notNull(this.digest, "digest must be not null !"); this.engine = new SM2Engine(this.digest, this.mode); } this.digest.reset(); return this.engine; } /** * 获取{@link SM2Signer},此对象为懒加载模式 * * @return {@link SM2Signer} */ private SM2Signer getSigner() { if (null == this.signer) { Assert.notNull(this.digest, "digest must be not null !"); this.signer = new SM2Signer(this.encoding, this.digest); } this.digest.reset(); return this.signer; } // ------------------------------------------------------------------------------------------------------------------------- Private method end }




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