SM2 国密加密加签操作工具

pom引入依bouncycastle赖
注意：bouncycastle版本过低会出现报错（我之前报错的的版本号1.60，修改后使用的1.68）

<dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-ext-jdk15to18</artifactId><version>1.68</version>
</dependency>
<dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15to18</artifactId><version>1.68</version>
</dependency>

初始化密钥对

private static void initKeyBase64() {// 创建 sm2 对象SM2 sm2 = SmUtil.sm2();// 这里会自动生成对应的随机秘钥对 , 注意！ 这里一定要强转，才能得到对应有效的秘钥信息byte[] privateKey = BCUtil.encodeECPrivateKey(sm2.getPrivateKey());// 这里公钥不压缩 公钥的第一个字节用于表示是否压缩 可以不要byte[] publicKey = ((BCECPublicKey) sm2.getPublicKey()).getQ().getEncoded(false);// 打印当前的公私秘钥System.out.println("SM2 公钥（HEX）: " + HexUtil.encodeHexStr(publicKey));System.out.println("SM2 公钥长度（HEX）: " + HexUtil.encodeHexStr(publicKey).length());System.out.println("SM2 公钥（BASE64）: " + Base64.encodeBase64String(publicKey));System.out.println("SM2 公钥长度（BASE64）: " + Base64.encodeBase64String(publicKey).length());System.out.println("SM2 私钥（HEX）: " + HexUtil.encodeHexStr(privateKey));System.out.println("SM2 私钥公钥长度（HEX）: " + HexUtil.encodeHexStr(privateKey).length());System.out.println("SM2 私钥（BASE64）: " + Base64.encodeBase64String(privateKey));System.out.println("SM2 私钥长度（BASE64）: " + Base64.encodeBase64String(privateKey).length());
}

加密

public static String cmbSM2Encrypt(String sPubKey, String pladat, String charset) {if (null == charset || !GBK.equalsIgnoreCase(charset)) {charset = UTF_8;}if (StringUtils.isEmpty(pladat)) {throw new BusinessException("TYSM208", "原文为空");}try {byte[] pubkey = Base64.decodeBase64(sPubKey);byte[] msg = pladat.getBytes(charset);byte[] resBt = cmbSM2Encrypt(pubkey, msg);return Base64.encodeBase64String(resBt);} catch (Exception ex) {System.out.println("SM4Tool.CMBEecrypt error:" + ex);throw new BusinessException("加密异常:" + ex.getMessage(), "TYSM209");}
}private static byte[] cmbSM2Encrypt(byte[] pubkey, byte[] msg) {if (pubkey == null || msg == null || msg.length == 0) {throw new BusinessException("请求参数不合法", "TYSM211");} else if (pubkey.length != 65) {throw new BusinessException("公钥非法", "TYSM212");} else if (pubkey[0] != 4) {throw new BusinessException("公钥非法", "TYSM213");} else {ECPublicKeyParameters publicKey = null;try {publicKey = encodePublicKey(pubkey);} catch (Exception var7) {throw new BusinessException("公钥非法", "TYSM214");}SM2Engine engine = new SM2Engine();engine.init(true, new ParametersWithRandom(publicKey, new SecureRandom()));try {byte[] cipherText = engine.processBlock(msg, 0, msg.length);return C1C2C3ToC1C3C2(cipherText);} catch (InvalidCipherTextException var6) {throw new BusinessException("加密失败。", "TYSM215");}}
}

解密

public static String cmbSM2Decrypt(String sPrvKeyStr, String strData, String charset) {if (null == charset || !GBK.equalsIgnoreCase(charset)) {charset = UTF_8;}if (StringUtils.isEmpty(strData)) {throw new BusinessException("密文为空", "TYSM206");}try {byte[] privkey = Base64.decodeBase64(sPrvKeyStr);byte[] msg = Base64.decodeBase64(strData);byte[] resBt = cmbSM2Decrypt(privkey, msg);return new String(resBt, charset);} catch (Exception ex) {System.out.println("SM4Tool.CMBDecrypt error:" + ex);throw new BusinessException("解密异常:" + ex.getMessage(), "TYSM207");}
}private static byte[] cmbSM2Decrypt(byte[] privkey, byte[] msg) {if (privkey == null || msg == null || privkey.length != 32) {throw new BusinessException("请求参数不合法", "TYSM216");} else if (msg.length < 97) {throw new BusinessException("密文有误", "TYSM217");} else if (msg[0] != 4) {throw new BusinessException("密文有误#2", "TYSM218");} else {msg = C1C3C2ToC1C2C3(msg);ECPrivateKeyParameters privateKey = null;try {privateKey = encodePrivateKey(privkey);} catch (Exception var7) {throw new BusinessException("TYSM219", "公钥错误");}SM2Engine engine = new SM2Engine();engine.init(false, privateKey);try {return engine.processBlock(msg, 0, msg.length);} catch (InvalidCipherTextException var6) {throw new BusinessException("TYSM220", "解密失败。");}}
}private static byte[] C1C3C2ToC1C2C3(byte[] cipherText) {if (cipherText != null && cipherText.length >= 97) {byte[] bytes = new byte[cipherText.length];System.arraycopy(cipherText, 0, bytes, 0, 65);System.arraycopy(cipherText, 97, bytes, 65, cipherText.length - 97);System.arraycopy(cipherText, 65, bytes, cipherText.length - 32, 32);return bytes;} else {throw new BusinessException("TYSM221", "密文有误#3");}
}

加签

public static String cmbSM2Sign(String sPrivateKey, String sStrToSign, String doSM3, String charset) {if (StringUtils.isEmpty(sPrivateKey) || StringUtils.isEmpty(sStrToSign)) {throw new BusinessException("签名数据有误,请检查", "TYSM201");}if (!"gbk".equalsIgnoreCase(charset)) {charset = "utf-8";}try {byte[] privkey = Base64.decodeBase64(sPrivateKey);byte[] msg = "Y".equals(doSM3) ? CMBSM3Digest(sStrToSign.getBytes(charset)) : sStrToSign.getBytes(charset);ECPrivateKeyParameters privateKey = encodePrivateKey(privkey);SM2Signer signer = new SM2Signer();ParametersWithID parameters = new ParametersWithID(privateKey, USER_ID);signer.init(true, parameters);signer.update(msg, 0, msg.length);return Base64.encodeBase64String(decodeDERSignature(signer.generateSignature()));} catch (Exception var8) {throw new BusinessException("签名异常:" + var8.getMessage(), "TYSM202");}
}private static byte[] CMBSM3Digest(byte[] msg) {byte[]bytes = new byte[32];SM3Digest digest = new SM3Digest();digest.update(msg, 0, msg.length);digest.doFinal(bytes, 0);digest.reset();return bytes;
}private static ECPrivateKeyParameters encodePrivateKey(byte[] value) {BigInteger d = new BigInteger(1, value);return new ECPrivateKeyParameters(d, getECDomainParameters());
}private static ECDomainParameters getECDomainParameters() {ECParameterSpec spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");return new ECDomainParameters(spec.getCurve(), spec.getG(), spec.getN(), spec.getH(), spec.getSeed());
}

验签

public static Boolean cmbSM2Verify(String sPubKey, String strToSign, String strSign, String doSM3, String charset) {if (!GBK.equalsIgnoreCase(charset)) {charset = UTF_8;}try {byte[] pubKeys = Base64.decodeBase64(sPubKey);byte[] byteBuffer = "Y".equals(doSM3) ? CMBSM3Digest(strToSign.getBytes(charset)) : strToSign.getBytes(charset);byte[] signature = Base64.decodeBase64(strSign);ECPublicKeyParameters publicKey = encodePublicKey(pubKeys);SM2Signer signer = new SM2Signer();ParametersWithID parameters = new ParametersWithID(publicKey, USER_ID);signer.init(false, parameters);signer.update(byteBuffer, 0, byteBuffer.length);if (!signer.verifySignature(encodeDERSignature(signature))) {throw new BusinessException("请求签名校验不通过。", "TYSM204");}return true;} catch (Exception e) {if (e instanceof BusinessException) {throw (BusinessException) e;}System.out.println("Verify signature fail: " + e.getMessage());throw new BusinessException("请求签名校验失败。", "TYSM205");}
}private static ECPublicKeyParameters encodePublicKey(byte[] value) {byte[] x = new byte[32];byte[] y = new byte[32];System.arraycopy(value, 1, x, 0, 32);System.arraycopy(value, 33, y, 0, 32);BigInteger iX = new BigInteger(1, x);BigInteger iY = new BigInteger(1, y);ECPoint ecQ = getSM2Curve().createPoint(iX, iY);return new ECPublicKeyParameters(ecQ, getECDomainParameters());
}private static ECCurve getSM2Curve() {ECParameterSpec spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");return spec.getCurve();
}private static ECDomainParameters getECDomainParameters() {ECParameterSpec spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");return new ECDomainParameters(spec.getCurve(), spec.getG(), spec.getN(), spec.getH(), spec.getSeed());
}}

测试

public static void main(String[] args) {//initKeyBase64();Map<String, String> map = new HashMap<>(3);map.put("mobile", "18468242454");map.put("skuCode", "sku2021001");//TODO 后面替换为真实的核心企业IDmap.put("coreId", "sku2021001");String data = JSON.toJSONString(map);String publicSecret = "BMTxlXewbroQEvkgEg41bzUfYE5TVQiBpd4yrOeBQ9Ck3Kj0gHxvGaKnjc4ECwwJ7lIHYwNoCkh6JzxX/3sQ36A=";System.out.println("公钥字符长度：" + publicSecret.length());String privateSecret = "NgQBMpptzmgbnl2/yp1xBz7iafpBsyFEpz5kqhdpLSk=";System.out.println("私钥字符长度：" + privateSecret.length());System.out.println("加密前的字符：" + data);//用对方给的公钥加密，然后传给对方//result：加密得到的数据String result = cmbSM2Encrypt(publicSecret, data, "UTF-8");System.out.println("加密得到的字符：" + result);//dt：对方数据解密都得到的原文String olData = cmbSM2Decrypt(privateSecret, result, "UTF-8");System.out.println("解密后的字符：" + olData);String signData = cmbSM2Sign(privateSecret, data, "Y", "UTF-8");System.out.println("签名得到的字符：" + signData);Boolean y = cmbSM2Verify(publicSecret, data, signData, "Y", "UTF-8");System.out.println("签名验证结果：" + y);
}

全部代码

package com.***;public class SM2Utils {private static final String UTF_8 = "UTF-8";
private static final String GBK = "GBK";
private static final byte[] USER_ID = "1234567812345678".getBytes();/*** 使用SM2私钥进行签名** @param sPrivateKey:私钥字符串（BASE64)* @param sStrToSign:待签名数据* @param doSM3：是否通过SM3摘要器获取数据摘要* @param charset:字符集* @return* @throws BusinessException*/
public static String cmbSM2Sign(String sPrivateKey, String sStrToSign, String doSM3, String charset) {if (StringUtils.isEmpty(sPrivateKey) || StringUtils.isEmpty(sStrToSign)) {throw new BusinessException("签名数据有误,请检查", "TYSM201");}if (!"gbk".equalsIgnoreCase(charset)) {charset = "utf-8";}try {byte[] privkey = Base64.decodeBase64(sPrivateKey);byte[] msg = "Y".equals(doSM3) ? CMBSM3Digest(sStrToSign.getBytes(charset)) : sStrToSign.getBytes(charset);ECPrivateKeyParameters privateKey = encodePrivateKey(privkey);SM2Signer signer = new SM2Signer();ParametersWithID parameters = new ParametersWithID(privateKey, USER_ID);signer.init(true, parameters);signer.update(msg, 0, msg.length);return Base64.encodeBase64String(decodeDERSignature(signer.generateSignature()));} catch (Exception var8) {throw new BusinessException("签名异常:" + var8.getMessage(), "TYSM202");}
}/*** 验证签名* @param sPubKey：公钥字符串（BASE64)* @param strToSign：待验签数据* @param strSign:签名结果* @param doSM3：是否通过SM3摘要器获取数据摘要* @param charset:字符集* @throws BusinessException*/
public static Boolean cmbSM2Verify(String sPubKey, String strToSign, String strSign, String doSM3, String charset) {if (!GBK.equalsIgnoreCase(charset)) {charset = UTF_8;}try {byte[] pubKeys = Base64.decodeBase64(sPubKey);byte[] byteBuffer = "Y".equals(doSM3) ? CMBSM3Digest(strToSign.getBytes(charset)) : strToSign.getBytes(charset);byte[] signature = Base64.decodeBase64(strSign);ECPublicKeyParameters publicKey = encodePublicKey(pubKeys);SM2Signer signer = new SM2Signer();ParametersWithID parameters = new ParametersWithID(publicKey, USER_ID);signer.init(false, parameters);signer.update(byteBuffer, 0, byteBuffer.length);if (!signer.verifySignature(encodeDERSignature(signature))) {throw new BusinessException("请求签名校验不通过。", "TYSM204");}return true;} catch (Exception e) {if (e instanceof BusinessException) {throw (BusinessException) e;}System.out.println("Verify signature fail: " + e.getMessage());throw new BusinessException("请求签名校验失败。", "TYSM205");}
}/*** 使用SM2私钥进行解密** @return* @throws Exception*/
public static String cmbSM2Decrypt(String sPrvKeyStr, String strData, String charset) {if (null == charset || !GBK.equalsIgnoreCase(charset)) {charset = UTF_8;}if (StringUtils.isEmpty(strData)) {throw new BusinessException("密文为空", "TYSM206");}try {byte[] privkey = Base64.decodeBase64(sPrvKeyStr);byte[] msg = Base64.decodeBase64(strData);byte[] resBt = cmbSM2Decrypt(privkey, msg);return new String(resBt, charset);} catch (Exception ex) {System.out.println("SM4Tool.CMBDecrypt error:" + ex);throw new BusinessException("解密异常:" + ex.getMessage(), "TYSM207");}
}/*** 使用SM2公钥进行加密** @return* @throws Exception*/
public static String cmbSM2Encrypt(String sPubKey, String pladat, String charset) {if (null == charset || !GBK.equalsIgnoreCase(charset)) {charset = UTF_8;}if (StringUtils.isEmpty(pladat)) {throw new BusinessException("TYSM208", "原文为空");}try {byte[] pubkey = Base64.decodeBase64(sPubKey);byte[] msg = pladat.getBytes(charset);byte[] resBt = cmbSM2Encrypt(pubkey, msg);return Base64.encodeBase64String(resBt);} catch (Exception ex) {System.out.println("SM4Tool.CMBEecrypt error:" + ex);throw new BusinessException("加密异常:" + ex.getMessage(), "TYSM209");}
}private static byte[] cmbSM2Encrypt(byte[] pubkey, byte[] msg) {if (pubkey == null || msg == null || msg.length == 0) {throw new BusinessException("请求参数不合法", "TYSM211");} else if (pubkey.length != 65) {throw new BusinessException("公钥非法", "TYSM212");} else if (pubkey[0] != 4) {throw new BusinessException("公钥非法", "TYSM213");} else {ECPublicKeyParameters publicKey = null;try {publicKey = encodePublicKey(pubkey);} catch (Exception var7) {throw new BusinessException("公钥非法", "TYSM214");}SM2Engine engine = new SM2Engine();engine.init(true, new ParametersWithRandom(publicKey, new SecureRandom()));try {byte[] cipherText = engine.processBlock(msg, 0, msg.length);return C1C2C3ToC1C3C2(cipherText);} catch (InvalidCipherTextException var6) {throw new BusinessException("加密失败。", "TYSM215");}}
}private static byte[] cmbSM2Decrypt(byte[] privkey, byte[] msg) {if (privkey == null || msg == null || privkey.length != 32) {throw new BusinessException("请求参数不合法", "TYSM216");} else if (msg.length < 97) {throw new BusinessException("密文有误", "TYSM217");} else if (msg[0] != 4) {throw new BusinessException("密文有误#2", "TYSM218");} else {msg = C1C3C2ToC1C2C3(msg);ECPrivateKeyParameters privateKey = null;try {privateKey = encodePrivateKey(privkey);} catch (Exception var7) {throw new BusinessException("TYSM219", "公钥错误");}SM2Engine engine = new SM2Engine();engine.init(false, privateKey);try {return engine.processBlock(msg, 0, msg.length);} catch (InvalidCipherTextException var6) {throw new BusinessException("TYSM220", "解密失败。");}}
}private static byte[] C1C3C2ToC1C2C3(byte[] cipherText) {if (cipherText != null && cipherText.length >= 97) {byte[] bytes = new byte[cipherText.length];System.arraycopy(cipherText, 0, bytes, 0, 65);System.arraycopy(cipherText, 97, bytes, 65, cipherText.length - 97);System.arraycopy(cipherText, 65, bytes, cipherText.length - 32, 32);return bytes;} else {throw new BusinessException("TYSM221", "密文有误#3");}
}private static byte[] C1C2C3ToC1C3C2(byte[] cipherText) {if (cipherText != null && cipherText.length >= 97) {byte[] bytes = new byte[cipherText.length];System.arraycopy(cipherText, 0, bytes, 0, 65);System.arraycopy(cipherText, cipherText.length - 32, bytes, 65, 32);System.arraycopy(cipherText, 65, bytes, 97, cipherText.length - 97);return bytes;} else {throw new BusinessException("TYSM222", "密文有误#3");}
}private static byte[] decodeDERSignature(byte[] signature) {try (ASN1InputStream stream = new ASN1InputStream(new ByteArrayInputStream(signature))) {ASN1Sequence primitive = (ASN1Sequence) stream.readObject();Enumeration<ASN1Integer> enumeration = primitive.getObjects();BigInteger R = enumeration.nextElement().getValue();BigInteger S = enumeration.nextElement().getValue();byte[] bytes = new byte[64];byte[] r = format(R.toByteArray());byte[] s = format(S.toByteArray());System.arraycopy(r, 0, bytes, 0, 32);System.arraycopy(s, 0, bytes, 32, 32);return bytes;} catch (Exception var10) {throw new BusinessException("签名解析异常:" + var10.getMessage(), "TYSM223");}
}private static byte[] format(byte[] value) {if (value.length == 32) {return value;} else {byte[] bytes = new byte[32];if (value.length > 32) {System.arraycopy(value, value.length - 32, bytes, 0, 32);} else {System.arraycopy(value, 0, bytes, 32 - value.length, value.length);}return bytes;}
}private static ECPrivateKeyParameters encodePrivateKey(byte[] value) {BigInteger d = new BigInteger(1, value);return new ECPrivateKeyParameters(d, getECDomainParameters());
}private static byte[] encodeDERSignature(byte[] signature) {byte[] r = new byte[32];byte[] s = new byte[32];System.arraycopy(signature, 0, r, 0, 32);System.arraycopy(signature, 32, s, 0, 32);ASN1EncodableVector vector = new ASN1EncodableVector();vector.add(new ASN1Integer(new BigInteger(1, r)));vector.add(new ASN1Integer(new BigInteger(1, s)));try {return (new DERSequence(vector)).getEncoded();} catch (IOException var6) {throw new BusinessException("签名数据不正确", "TYSM224");}
}private static ECPublicKeyParameters encodePublicKey(byte[] value) {byte[] x = new byte[32];byte[] y = new byte[32];System.arraycopy(value, 1, x, 0, 32);System.arraycopy(value, 33, y, 0, 32);BigInteger iX = new BigInteger(1, x);BigInteger iY = new BigInteger(1, y);ECPoint ecQ = getSM2Curve().createPoint(iX, iY);return new ECPublicKeyParameters(ecQ, getECDomainParameters());
}private static ECCurve getSM2Curve() {ECParameterSpec spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");return spec.getCurve();
}private static ECDomainParameters getECDomainParameters() {ECParameterSpec spec = ECNamedCurveTable.getParameterSpec("sm2p256v1");return new ECDomainParameters(spec.getCurve(), spec.getG(), spec.getN(), spec.getH(), spec.getSeed());
}/*** 通过SM3摘要器获取数据摘要** @return 摘要*/
private static byte[] CMBSM3Digest(byte[] msg) {byte[] bytes = new byte[32];SM3Digest digest = new SM3Digest();digest.update(msg, 0, msg.length);digest.doFinal(bytes, 0);digest.reset();return bytes;
}private static void initKeyBase64() {// 创建 sm2 对象SM2 sm2 = SmUtil.sm2();// 这里会自动生成对应的随机秘钥对 , 注意！ 这里一定要强转，才能得到对应有效的秘钥信息byte[] privateKey = BCUtil.encodeECPrivateKey(sm2.getPrivateKey());// 这里公钥不压缩 公钥的第一个字节用于表示是否压缩 可以不要byte[] publicKey = ((BCECPublicKey) sm2.getPublicKey()).getQ().getEncoded(false);// 打印当前的公私秘钥System.out.println("SM2 公钥（HEX）: " + HexUtil.encodeHexStr(publicKey));System.out.println("SM2 公钥长度（HEX）: " + HexUtil.encodeHexStr(publicKey).length());System.out.println("SM2 公钥（BASE64）: " + Base64.encodeBase64String(publicKey));System.out.println("SM2 公钥长度（BASE64）: " + Base64.encodeBase64String(publicKey).length());System.out.println("SM2 私钥（HEX）: " + HexUtil.encodeHexStr(privateKey));System.out.println("SM2 私钥公钥长度（HEX）: " + HexUtil.encodeHexStr(privateKey).length());System.out.println("SM2 私钥（BASE64）: " + Base64.encodeBase64String(privateKey));System.out.println("SM2 私钥长度（BASE64）: " + Base64.encodeBase64String(privateKey).length());}public static void main(String[] args) {//initKeyBase64();Map<String, String> map = new HashMap<>(3);map.put("mobile", "18468242454");map.put("skuCode", "sku2021001");//TODO 后面替换为真实的核心企业IDmap.put("coreId", "sku2021001");String data = JSON.toJSONString(map);String publicSecret = "BMTxlXewbroQEvkgEg41bzUfYE5TVQiBpd4yrOeBQ9Ck3Kj0gHxvGaKnjc4ECwwJ7lIHYwNoCkh6JzxX/3sQ36A=";System.out.println("公钥字符长度：" + publicSecret.length());String privateSecret = "NgQBMpptzmgbnl2/yp1xBz7iafpBsyFEpz5kqhdpLSk=";System.out.println("私钥字符长度：" + privateSecret.length());System.out.println("加密前的字符：" + data);//用对方给的公钥加密，然后传给对方//result：加密得到的数据String result = cmbSM2Encrypt(publicSecret, data, "UTF-8");System.out.println("加密得到的字符：" + result);//dt：对方数据解密都得到的原文String olData = cmbSM2Decrypt(privateSecret, result, "UTF-8");System.out.println("解密后的字符：" + olData);String signData = cmbSM2Sign(privateSecret, data, "Y", "UTF-8");System.out.println("签名得到的字符：" + signData);Boolean y = cmbSM2Verify(publicSecret, data, signData, "Y", "UTF-8");System.out.println("签名验证结果：" + y);
}

}

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