加密工具(md5、SHA1、SHA256、RSA、AES、DES)

程序员文章站 2022-03-14 23:20:04

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自己写的加密util

import cn.hutool.core.lang.Assert;
import org.springframework.util.DigestUtils;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

/**
 * @author zhang
 */
public class EncryptUtil {

    public static final String RSA = "RSA";
    public static final String AES = "AES";
    public static final String DES = "DES";
    public static final String BASE_64 = "base64";

    public static String md5(String data) {
        return DigestUtils.md5DigestAsHex(data.getBytes());
    }

    public static String sha1(String data) {
        try {
            MessageDigest crypt = MessageDigest.getInstance("SHA-1");
            crypt.reset();
            crypt.update(data.getBytes(StandardCharsets.UTF_8));
            return new BigInteger(1, crypt.digest()).toString(16);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String sha256(String data) {
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(data.getBytes(StandardCharsets.UTF_8));
            byte[] bytes = messageDigest.digest();
            return parseByte2HexStr(bytes);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }


    public static String rsaSHA1(String data, String privateKey, String outputEncoding) {
        try {
            byte[] keyBytes = Base64.getDecoder().decode(privateKey.getBytes());
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
            PrivateKey priKey = KeyFactory.getInstance(RSA).generatePrivate(keySpec);
            Signature signature = Signature.getInstance("SHA1withRSA");
            signature.initSign(priKey);
            signature.update(data.getBytes(StandardCharsets.UTF_8));
            byte[] signs = signature.sign();
            if (BASE_64.equals(outputEncoding)) {
                return Base64.getEncoder().encodeToString(signs);
            }
            return parseByte2HexStr(signs);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    public static String rsaSHA256(String data, String privateKey, String outputEncoding) {
        try {
            byte[] keyBytes = Base64.getDecoder().decode(privateKey.getBytes());
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
            PrivateKey priKey = KeyFactory.getInstance(RSA).generatePrivate(keySpec);
            Signature signature = Signature.getInstance("SHA256withRSA");
            signature.initSign(priKey);
            signature.update(data.getBytes(StandardCharsets.UTF_8));
            byte[] signs = signature.sign();
            if (BASE_64.equals(outputEncoding)) {
                return Base64.getEncoder().encodeToString(signs);
            }
            return parseByte2HexStr(signs);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String rsaPublicEncrypt(String publicKey, String data, String outputEncoding) {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.getDecoder().decode(publicKey));
            RSAPublicKey key = (RSAPublicKey) keyFactory.generatePublic(x509KeySpec);
            Cipher cipher = Cipher.getInstance(RSA);
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] bytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
            if (BASE_64.equals(outputEncoding)) {
                return Base64.getEncoder().encodeToString(bytes);
            }
            return parseByte2HexStr(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String rsaPublicDecrypt(String publicKey, String data, String inputEncoding) {
        try {
            byte[] dataBytes;
            if (BASE_64.equals(inputEncoding)) {
                dataBytes = Base64.getDecoder().decode(data);
            } else {
                dataBytes = parseHexStr2Byte(data);
            }

            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.getDecoder().decode(publicKey));
            RSAPublicKey key = (RSAPublicKey) keyFactory.generatePublic(x509KeySpec);
            Cipher cipher = Cipher.getInstance(RSA);
            cipher.init(Cipher.DECRYPT_MODE, key);
            return new String(cipher.doFinal(dataBytes));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String rsaPrivateEncrypt(String privateKey, String data, String outputEncoding) {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(privateKey));
            RSAPrivateKey key = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
            Cipher cipher = Cipher.getInstance(RSA);
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] bytes = cipher.doFinal(data.getBytes());
            if (BASE_64.equals(outputEncoding)) {
                return Base64.getEncoder().encodeToString(bytes);
            }
            return parseByte2HexStr(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String rsaPrivateDecrypt(String privateKey, String data, String inputEncoding) {
        try {
            byte[] dataBytes;
            if (BASE_64.equals(inputEncoding)) {
                dataBytes = Base64.getDecoder().decode(data);
            } else {
                dataBytes = parseHexStr2Byte(data);
            }
            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(privateKey));
            RSAPrivateKey key = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
            Cipher cipher = Cipher.getInstance(RSA);
            cipher.init(Cipher.DECRYPT_MODE, key);
            return new String(cipher.doFinal(dataBytes));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String aesEncrypt(String data, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance(AES);
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes());
            kgen.init(128, random);
            Cipher cipher = Cipher.getInstance(AES);
            cipher.init(Cipher.ENCRYPT_MODE, kgen.generateKey());
            return Base64.getEncoder().encodeToString(cipher.doFinal(data.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String aesDecrypt(String data, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance(AES);
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes());
            kgen.init(128, random);
            Cipher cipher = Cipher.getInstance(AES);
            cipher.init(Cipher.DECRYPT_MODE, kgen.generateKey());
            return new String(cipher.doFinal(Base64.getDecoder().decode(data)));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String desEncrypt(String data, String password) {
        try {
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
            Cipher cipher = Cipher.getInstance(DES);
            cipher.init(Cipher.ENCRYPT_MODE, keyFactory.generateSecret(new DESKeySpec(password.getBytes())), new SecureRandom());
            return Base64.getEncoder().encodeToString(cipher.doFinal(data.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String desDecrypt(String data, String password) {
        try {
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
            Cipher cipher = Cipher.getInstance(DES);
            cipher.init(Cipher.DECRYPT_MODE, keyFactory.generateSecret(new DESKeySpec(password.getBytes())), new SecureRandom());
            return new String(cipher.doFinal(Base64.getDecoder().decode(data.getBytes())));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String parseByte2HexStr(byte[] buf) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) {
            return new byte[0];
        }
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    private static boolean verifyWhenSha1Sign(String content, String sign, PublicKey publicKey) throws Exception {
        byte[] contentBytes = content.getBytes(StandardCharsets.UTF_8);
        Signature signature = Signature.getInstance("SHA1withRSA");
        signature.initVerify(publicKey);
        signature.update(contentBytes);
        return signature.verify(Base64.getDecoder().decode(sign));
    }

    private static boolean verifyWhenSha256Sign(String content, String sign, PublicKey publicKey) throws Exception {
        byte[] contentBytes = content.getBytes(StandardCharsets.UTF_8);
        Signature signature = Signature.getInstance("SHA256withRSA");
        signature.initVerify(publicKey);
        signature.update(contentBytes);
        return signature.verify(Base64.getDecoder().decode(sign));
    }

    public static void main(String[] args) throws Exception {
        String data = "123456";
        String password = "aaaaaaaaa";
        //MD5
        Assert.isTrue("e10adc3949ba59abbe56e057f20f883e".equalsIgnoreCase(md5(data)));
        //sha1
        Assert.isTrue("7c4a8d09ca3762af61e59520943dc26494f8941b".equalsIgnoreCase(sha1(data)));
        //sha256
        Assert.isTrue("8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92".equalsIgnoreCase(sha256(data)));

        //创建rsa公钥私钥
        KeyPairGenerator ****** = KeyPairGenerator.getInstance(RSA);
        KeyPair keyPair = ******.generateKeyPair();
        PublicKey publicKey = keyPair.getPublic();
        PrivateKey privateKey = keyPair.getPrivate();
        String privateKeyStr = new String(Base64.getEncoder().encode(privateKey.getEncoded()), StandardCharsets.UTF_8);
        String publicKeyStr = new String(Base64.getEncoder().encode(publicKey.getEncoded()), StandardCharsets.UTF_8);

        //sh1签名
        String sha1Sign = rsaSHA1(data, privateKeyStr, BASE_64);
        Assert.isTrue(verifyWhenSha1Sign(data, sha1Sign, publicKey));

        //sh256签名
        String sha256Sign = rsaSHA256(data, privateKeyStr, BASE_64);
        Assert.isTrue(verifyWhenSha256Sign(data, sha256Sign, publicKey));

        //aes加解密
        Assert.isTrue(data.equalsIgnoreCase(aesDecrypt(aesEncrypt(data, password), password)));

        //des加解密
        Assert.isTrue(data.equalsIgnoreCase(desDecrypt(desEncrypt(data, password), password)));

        //公钥加密私钥解密
        String pass = rsaPublicEncrypt(publicKeyStr, data, BASE_64);
        String dePass2 =  rsaPrivateDecrypt(privateKeyStr, pass, BASE_64);
        Assert.isTrue(data.equalsIgnoreCase(dePass2));

        //私钥加密公钥解密
        String pass2 = rsaPrivateEncrypt(privateKeyStr, data, BASE_64);
        String dePass = rsaPublicDecrypt(publicKeyStr, pass2, BASE_64);
        Assert.isTrue(data.equalsIgnoreCase(dePass));

    }
}

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