欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

使用Bouncy Castle(pom版本:bcprov-jdk15on 1.59)中SM4 加密解密算法 ECB

程序员文章站 2022-04-12 22:09:19
SM4 加密算法 加密 SM4算法是一种分组密码算法。其分组长度为128bit,密钥长度也为128bit。加密算法与密钥扩展算法均采用32轮非线性迭代结构,以字(32位)为单位进行加密运算,每一次迭代运算均为一轮变换函数F。SM4算法加/解密算法的结构相同,只是使用轮密钥相反,其中解密轮密钥是加密轮密钥的逆序。public class encryption_decrypt { static { Security.addProvider(new BouncyCastleProvi...

SM4 加密算法 加密 SM4算法是一种分组密码算法。其分组长度为128bit,密钥长度也为128bit。

加密算法与密钥扩展算法均采用32轮非线性迭代结构,以字(32位)为单位进行加密运算,每一次迭代运算均为一轮变换函数F。SM4算法加/解密算法的结构相同,只是使用轮密钥相反,其中解密轮密钥是加密轮密钥的逆序。

public class encryption_decrypt {

    static {
        Security.addProvider(new BouncyCastleProvider());
    }
    private static final String ENCODING = "UTF-8";
    public static final String ALGORITHM_NAME = "SM4";
    // 加密算法/分组加密模式/分组填充方式
    // PKCS5Padding-以8个字节为一组进行分组加密
    // 定义分组加密模式使用:PKCS5Padding
    public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";
    // 128-32位16进制;256-64位16进制
    public static final int DEFAULT_KEY_SIZE = 128;
    private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key) throws Exception {
        Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
        Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);
        cipher.init(mode, sm4Key);
        return cipher;
    }
    public static String encryptEcb(byte[] hexKey, String paramStr) throws Exception {
        String cipherText = null;
        byte[] keyData = hexKey;

        byte[] srcData = paramStr.getBytes(ENCODING);
        byte[] cipherArray = encrypt_Ecb_Padding(keyData, srcData);
        cipherText = Base64.getEncoder().encodeToString(cipherArray);
       return cipherText;
    }

    public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception {
        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);
        return cipher.doFinal(data);
    }

    public static String decryptEcb(byte[] hexKey, String cipherText) throws Exception {
        String decryptStr = "";
        byte[] keyData = hexKey;
        byte[] cipherData = Base64.getDecoder().decode(cipherText);
        byte[] srcData = decrypt_Ecb_Padding(keyData, cipherData);
        decryptStr = new String(srcData, ENCODING);
        return decryptStr;
    }
    public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception {
        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);
        return cipher.doFinal(cipherText);
    }
    public static boolean verifyEcb(byte[] hexKey, String cipherText, String paramStr) throws Exception {
        boolean flag = false;
        byte[] keyData = hexKey;
        byte[] cipherData = Base64.getDecoder().decode(cipherText);
        byte[] decryptData = decrypt_Ecb_Padding(keyData, cipherData);
        byte[] srcData = paramStr.getBytes(ENCODING);
        flag = Arrays.equals(decryptData, srcData);
        return flag;
    }
}

本文地址:https://blog.csdn.net/ProgrammerGHP/article/details/107686682

相关标签: Bouncy Castle java