基于BC库的国密算法 SM2算法工具

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import org.bouncycastle.crypto.AsymmetricCipherKeyPair; import org.bouncycastle.crypto.CipherParameters; import org.bouncycastle.crypto.CryptoException; import org.bouncycastle.crypto.InvalidCipherTextException; import org.bouncycastle.crypto.engines.SM2Engine; import org.bouncycastle.crypto.engines.SM2Engine.Mode; import org.bouncycastle.crypto.params.*; import org.bouncycastle.crypto.signers.SM2Signer; import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey; import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey; import org.bouncycastle.math.ec.ECPoint; import org.bouncycastle.math.ec.custom.gm.SM2P256V1Curve;   import java.math.BigInteger; import java.security.SecureRandom;     /**  * SM2算法工具  *  */ public final class SM2Utils {     /**      * Begin: SM2推荐曲线参数      */     private static final String SM2_ECC_GY_VAL = "BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0";     private static final String SM2_ECC_GX_VAL = "32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7";       private static final SM2P256V1Curve CURVE = new SM2P256V1Curve();     private final static BigInteger SM2_ECC_N = CURVE.getOrder();     private final static BigInteger SM2_ECC_H = CURVE.getCofactor();       private final static BigInteger SM2_ECC_GX = new BigInteger(SM2_ECC_GX_VAL, 16);     private final static BigInteger SM2_ECC_GY = new BigInteger(SM2_ECC_GY_VAL, 16);       private static final ECPoint G_POINT = CURVE.createPoint(SM2_ECC_GX, SM2_ECC_GY);     private static final ECDomainParameters DOMAIN_PARAMS = new ECDomainParameters(CURVE, G_POINT, SM2_ECC_N, SM2_ECC_H);     /**      * End: SM2推荐曲线参数      */       private SM2Utils()     {     }       /**      * 生成ECC密钥对      *      * @return ECC密钥对      */     public static AsymmetricCipherKeyPair generateKeyPairParameter()     {         final SecureRandom random = new SecureRandom();         return BCECUtils.generateKeyPairParameter(DOMAIN_PARAMS, random);     }       /**      * @param pubKey      *                   公钥      * @param srcData      *                   原文      * @return 默认输出C1C3C2顺序的密文。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @throws InvalidCipherTextException      */     public static byte[] encrypt(final BCECPublicKey pubKey, final byte[] srcData) throws InvalidCipherTextException     {         return encrypt(Mode.C1C3C2, pubKey, srcData);     }       /**      * @param pubKeyParams      *                        公钥      * @param srcData      *                        原文      * @return 默认输出C1C3C2顺序的密文。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @throws InvalidCipherTextException      */     public static byte[] encrypt(final ECPublicKeyParameters pubKeyParams, final byte[] srcData) throws InvalidCipherTextException     {         return encrypt(Mode.C1C3C2, pubKeyParams, srcData);     }       /**      * @param priKey      *                     私钥      * @param sm2Cipher      *                     默认输入C1C3C2顺序的密文。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @return 原文。SM2解密返回了数据则一定是原文，因为SM2自带校验，如果密文被篡改或者密钥对不上，都是会直接报异常的。      * @throws InvalidCipherTextException      */     public static byte[] decrypt(final BCECPrivateKey priKey, final byte[] sm2Cipher) throws InvalidCipherTextException     {         return decrypt(Mode.C1C3C2, priKey, sm2Cipher);     }       /**      * @param priKeyParams      *                        私钥      * @param sm2Cipher      *                        默认输入C1C3C2顺序的密文。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @return 原文。SM2解密返回了数据则一定是原文，因为SM2自带校验，如果密文被篡改或者密钥对不上，都是会直接报异常的。      * @throws InvalidCipherTextException      */     public static byte[] decrypt(final ECPrivateKeyParameters priKeyParams, final byte[] sm2Cipher)             throws InvalidCipherTextException     {         return decrypt(Mode.C1C3C2, priKeyParams, sm2Cipher);     }       /**      * 签名      *      * @param priKey      *                   私钥      * @param srcData      *                   原文      * @return DER编码后的签名值      * @throws CryptoException      */     public static byte[] sign(BCECPrivateKey priKey, byte[] srcData) throws CryptoException     {         return sign(priKey, null, srcData);     }       /**      * 签名，默认withId为字节数组:"1234567812345678".getBytes()      *      * @param priKeyParams      *                        私钥      * @param srcData      *                        原文      * @return DER编码后的签名值      * @throws CryptoException      */     public static byte[] sign(final ECPrivateKeyParameters priKeyParams, final byte[] srcData) throws CryptoException     {         return sign(priKeyParams, null, srcData);     }       /**      * 验签      *      * @param pubKey      *                   公钥      * @param srcData      *                   原文      * @param sign      *                   DER编码的签名值      * @return boolean      */     public static boolean verify(final BCECPublicKey pubKey, final byte[] srcData, final byte[] sign)     {         return verify(pubKey, null, srcData, sign);     }       /**      * 验签 不指定withId，则默认withId为字节数组:"1234567812345678".getBytes()      *      * @param pubKeyParams      *                        公钥      * @param srcData      *                        原文      * @param sign      *                        DER编码的签名值      * @return 验签成功返回true，失败返回false      */     public static boolean verify(final ECPublicKeyParameters pubKeyParams, final byte[] srcData, final byte[] sign)     {         return verify(pubKeyParams, null, srcData, sign);     }       /**      * @param mode      *                   指定密文结构，新的[《SM2密码算法使用规范》 GM/T 0009-2012]标准为C1C3C2      * @param pubKey      *                   公钥      * @param srcData      *                   原文      * @return 根据mode不同，输出的密文C1C2C3排列顺序不同。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @throws InvalidCipherTextException      */     private static byte[] encrypt(final Mode mode, final BCECPublicKey pubKey, final byte[] srcData)             throws InvalidCipherTextException     {         final ECPublicKeyParameters pubKeyParams = BCECUtils.convertPublicKeyToParameters(pubKey);         return encrypt(mode, pubKeyParams, srcData);     }       /**      * @param mode      *                        指定密文结构，新的[《SM2密码算法使用规范》 GM/T 0009-2012]标准为C1C3C2      * @param pubKeyParams      *                        公钥      * @param srcData      *                        原文      * @return 根据mode不同，输出的密文C1C2C3排列顺序不同。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @throws InvalidCipherTextException      */     private static byte[] encrypt(final Mode mode, final ECPublicKeyParameters pubKeyParams, final byte[] srcData)             throws InvalidCipherTextException     {         final SM2Engine engine = new SM2Engine(mode);         final ParametersWithRandom pwr = new ParametersWithRandom(pubKeyParams, new SecureRandom());         engine.init(true, pwr);         return engine.processBlock(srcData, 0, srcData.length);     }       /**      * 验签      *      * @param pubKey      *                   公钥      * @param withId      *                   可以为null，若为null，则默认withId为字节数组:"1234567812345678".getBytes()      * @param srcData      *                   原文      * @param sign      *                   DER编码的签名值      * @return boolean      */     private static boolean verify(final BCECPublicKey pubKey, final byte[] withId, final byte[] srcData, final byte[] sign)     {         final ECPublicKeyParameters pubKeyParams = BCECUtils.convertPublicKeyToParameters(pubKey);         return verify(pubKeyParams, withId, srcData, sign);     }       /**      * @param mode      *                     指定密文结构，新的[《SM2密码算法使用规范》 GM/T 0009-2012]标准为C1C3C2      * @param priKey      *                     私钥      * @param sm2Cipher      *                     根据mode不同，需要输入的密文C1C2C3排列顺序不同。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @return 原文。SM2解密返回了数据则一定是原文，因为SM2自带校验，如果密文被篡改或者密钥对不上，都是会直接报异常的。      * @throws InvalidCipherTextException      */     private static byte[] decrypt(final Mode mode, final BCECPrivateKey priKey, final byte[] sm2Cipher)             throws InvalidCipherTextException     {         final ECPrivateKeyParameters priKeyParams = BCECUtils.convertPrivateKeyToParameters(priKey);         return decrypt(mode, priKeyParams, sm2Cipher);     }       /**      * @param mode      *                        指定密文结构，新的[《SM2密码算法使用规范》 GM/T 0009-2012]标准为C1C3C2      * @param priKeyParams      *                        私钥      * @param sm2Cipher      *                        根据mode不同，需要输入的密文C1C2C3排列顺序不同。C1为65字节第1字节为压缩标识，这里固定为0x04，后面64字节为xy分量各32字节。C3为32字节。C2长度与原文一致。      * @return 原文。SM2解密返回了数据则一定是原文，因为SM2自带校验，如果密文被篡改或者密钥对不上，都是会直接报异常的。      * @throws InvalidCipherTextException      */     private static byte[] decrypt(final Mode mode, final ECPrivateKeyParameters priKeyParams, final byte[] sm2Cipher)             throws InvalidCipherTextException     {         final SM2Engine engine = new SM2Engine(mode);         engine.init(false, priKeyParams);         return engine.processBlock(sm2Cipher, 0, sm2Cipher.length);     }       /**      * 私钥签名      *      * @param priKey      *                   私钥      * @param withId      *                   可以为null，若为null，则默认withId为字节数组:"1234567812345678".getBytes()      * @param srcData      *                   原文      * @return DER编码后的签名值      * @throws CryptoException      */     private static byte[] sign(final BCECPrivateKey priKey, final byte[] withId, final byte[] srcData) throws CryptoException     {         final ECPrivateKeyParameters priKeyParams = BCECUtils.convertPrivateKeyToParameters(priKey);         return sign(priKeyParams, withId, srcData);     }       /**      * 签名      *      * @param priKeyParams      *                        私钥      * @param withId      *                        可以为null，若为null，则默认withId为字节数组:"1234567812345678".getBytes()      * @param srcData      *                        源数据      * @return DER编码后的签名值      * @throws CryptoException      */     private static byte[] sign(final ECPrivateKeyParameters priKeyParams, final byte[] withId, final byte[] srcData)             throws CryptoException     {         SM2Signer signer = new SM2Signer();         CipherParameters param = null;         ParametersWithRandom pwr = new ParametersWithRandom(priKeyParams, new SecureRandom());         if (withId != null)         {             param = new ParametersWithID(pwr, withId);         }         else         {             param = pwr;         }         signer.init(true, param);         signer.update(srcData, 0, srcData.length);         return signer.generateSignature();     }       /**      * 验签      *      * @param pubKeyParams      *                        公钥      * @param withId      *                        可以为null，若为null，则默认withId为字节数组:"1234567812345678".getBytes()      * @param srcData      *                        原文      * @param sign      *                        DER编码的签名值      * @return 验签成功返回true，失败返回false      */     private static boolean verify(final ECPublicKeyParameters pubKeyParams, final byte[] withId, final byte[] srcData,             final byte[] sign)     {         final SM2Signer signer = new SM2Signer();         CipherParameters param;         if (withId != null)         {             param = new ParametersWithID(pubKeyParams, withId);         }         else         {             param = pubKeyParams;         }         signer.init(false, param);         signer.update(srcData, 0, srcData.length);         return signer.verifySignature(sign);     } }