RSA公钥/私钥签名

1、首先创建一个接口类(ISignature)

public interface ISignature {
   public byte[] sign(byte[] content,String algorithm,PrivateKey privatekey);
   public boolean verify(byte[] content,byte[] signature,String algorithm,PublicKey publickey);
}
2、 实现类(Sign)

public class Sign implements ISignature {
    private static final Logger log = LoggerFactory.getLogger(Sign.class);

    /**
     * RSA签名
     *
     * @param content 待签内容
     * @param algorithm 签名算法,例如:MD5WithRSA、SHA1WithRSA
     * @param privatekey 私钥
     * @return 签名
     */
    @Override
    public byte[] sign(byte[] content, String algorithm, PrivateKey privatekey) {
        try {
            //用私钥对信息生成数字签名
            Signature stool = Signature.getInstance(algorithm);
            stool.initSign(privatekey);
            stool.update(content);
            return stool.sign();
        } catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException ex) {
            log.warn("sign failure.",ex);
            return null;
        }
    }

    /**
     * 校验签名
     *
     * @param content 待验内容
     * @param signature 签名
     * @param algorithm 签名算法,例如:MD5WithRSA、SHA1WithRSA
     * @param publickey 公钥
     * @return 是否有效签名
     */
    @Override
    public boolean verify(byte[] content,byte[] signature, String algorithm, PublicKey publickey) {
        try {
            Signature stool = Signature.getInstance(algorithm);
            stool.initVerify(publickey);
            stool.update(content);
            //验证签名是否正常
            return stool.verify(signature);
        } catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException ex) {
            log.warn("verify failure.",ex);
            return false;
        }
    }


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