org.bouncycastle.crypto.signers.SM2Signer Java Examples

/**
 * 验证签名值
 *
 * @param publicKey
 * @param signValue
 * @param msg
 * @return
 */
public boolean verify(byte[] publicKey, byte[] signValue, byte[] msg) throws CspException {
    if (null == publicKey) {
        throw new CspException("publicKey is null");
    }
    if (publicKey.length == 0) {
        throw new CspException("publicKey's length is 0");
    }
    if (null == signValue) {
        throw new CspException("signValue is null");
    }
    if (signValue.length == 0) {
        throw new CspException("signValue's length is 0");
    }
    if (null==msg) {
        throw new CspException("plainText is null");
    }
    if (msg.length == 0) {
        throw new CspException("plainText's length is 0");
    }
    SM2Signer signer = new SM2Signer();
    ECPublicKeyParameters ecPub = new ECPublicKeyParameters(byte2ECpoint(publicKey), ecc_bc_spec);
    signer.init(false, ecPub);
    signer.update(msg, 0, msg.length);
    return signer.verifySignature(signValue);
}
 

/**
 * 对数据进行签名
 *
 * @param privateKey
 * @param msg
 * @return
 * @throws CryptoException
 */
public byte[] sign(byte[] privateKey, byte[] msg) throws CspException {
    if (null == privateKey) {
        throw new CspException("privateKey is null");
    }
    if (privateKey.length == 0) {
        throw new CspException("privateKey's length is 0");
    }
    if (null==msg) {
        throw new CspException("plainText is null");
    }
    if (msg.length == 0) {
        throw new CspException("plainText's length is 0");
    }
    SM2Signer signer = new SM2Signer();
    BigInteger d = byte2BigInteger(privateKey);
    ECPrivateKeyParameters privateKeyParameters = new ECPrivateKeyParameters(d, ecc_bc_spec);
    signer.init(true, privateKeyParameters);
    signer.update(msg, 0, msg.length);
    byte[] sig = new byte[0];
    try {
        sig = signer.generateSignature();
    } catch (CryptoException e) {
        log.error(e.getMessage());
        throw new CspException(e);
    }
    return sig;
}
 

protected Signer createSigner(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
        throws OperatorCreationException {
  if (!AlgorithmUtil.isSM2SigAlg(sigAlgId)) {
    throw new OperatorCreationException("the given algorithm is not a valid EC signature "
        + "algorithm '" + sigAlgId.getAlgorithm().getId() + "'");
  }

  return new SM2Signer();
}
 

/**
 * get signature by sm2 key pair, use default userID.
 *
 * @param keyPair ECC key pair
 * @param srcData source data
 * @return signature bytes
 * @throws CryptoException -
 */
public static byte[] sign(AsymmetricCipherKeyPair keyPair, byte[] srcData) throws CryptoException {
    SM2Signer signer = new SM2Signer();
    CipherParameters param = new ParametersWithRandom(keyPair.getPrivate(), new SecureRandom());
    signer.init(true, param);
    signer.update(srcData, 0, srcData.length);
    return signer.generateSignature();
}
 

/**
 * verify sm2 signature.
 *
 * @param ecPublicKeyParameters ecPublicKey param
 * @param sourceData source data
 * @param signature signature
 * @return is legal
 */
public static boolean verify(byte[] sourceData, byte[] signature, ECPublicKeyParameters ecPublicKeyParameters) {
    SM2Signer signer = new SM2Signer();
    signer.init(false, ecPublicKeyParameters);
    signer.update(sourceData, 0, sourceData.length);
    return signer.verifySignature(signature);
}