编辑代码

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;

class NavicatPassword {

    private int version = 0;
    private final String aesKeyStr = "libcckeylibcckey";
    private final String aesIvStr = "libcciv libcciv ";
    private final String blowString = "3DC5CA39";
    private final byte[] blowKey;
    private final byte[] blowIv;

    public NavicatPassword(int version) {
        this.version = version;
        this.blowKey = sha1(blowString).getBytes(StandardCharsets.ISO_8859_1);
        this.blowIv = hexStringToByteArray("d9c7c3c8870d64bd");
    }

    public String encrypt(String string) throws Exception {
        switch (version) {
            case 11:
                return encryptEleven(string);
            case 12:
                return encryptTwelve(string);
            default:
                throw new IllegalArgumentException("Unsupported version");
        }
    }

    private String encryptEleven(String string) throws Exception {
        int round = string.length() / 8;
        int leftLength = string.length() % 8;
        StringBuilder result = new StringBuilder();
        byte[] currentVector = blowIv.clone();

        for (int i = 0; i < round; i++) {
            byte[] block = xorBytes(string.substring(i * 8, (i + 1) * 8).getBytes(StandardCharsets.ISO_8859_1), currentVector);
            byte[] encryptedBlock = encryptBlock(block, "Blowfish/ECB/NoPadding");
            currentVector = xorBytes(currentVector, encryptedBlock);
            result.append(new String(encryptedBlock, StandardCharsets.ISO_8859_1));
        }

        if (leftLength > 0) {
            // PKCS#5 padding for Blowfish (block size is 8 bytes)
            int padding = 8 - leftLength;
            byte[] paddedBlock = new byte[8];
            System.arraycopy(string.getBytes(StandardCharsets.ISO_8859_1), round * 8, paddedBlock, 0, leftLength);
            for (int i = leftLength; i < 8; i++) {
                paddedBlock[i] = (byte) padding;
            }
            byte[] encryptedLastBlock = encryptBlock(blowIv, "Blowfish/ECB/NoPadding");
            byte[] xoredLastBlock = xorBytes(paddedBlock, encryptedLastBlock);
            result.append(new String(xoredLastBlock, StandardCharsets.ISO_8859_1));
        }

        return toHexString(result.toString().getBytes(StandardCharsets.ISO_8859_1)).toUpperCase();
    }

    private String encryptTwelve(String string) throws Exception {
        // Add PKCS#7 padding to ensure the plaintext is a multiple of the block size (16 bytes)
        int padding = 16 - (string.length() % 16);
        byte[] paddedPlaintext = new byte[string.length() + padding];
        System.arraycopy(string.getBytes(StandardCharsets.ISO_8859_1), 0, paddedPlaintext, 0, string.length());
        for (int i = string.length(); i < paddedPlaintext.length; i++) {
            paddedPlaintext[i] = (byte) padding;
        }

        byte[] ciphertext = sodiumEncrypt(paddedPlaintext, aesKeyStr.getBytes(StandardCharsets.ISO_8859_1), aesIvStr.getBytes(StandardCharsets.ISO_8859_1));
        return toHexString(ciphertext).toUpperCase();
    }

    private byte[] sodiumEncrypt(byte[] plaintext, byte[] key, byte[] iv) throws Exception {
        if (key.length != 16 || iv.length != 16) {
            throw new IllegalArgumentException("Invalid key or IV length");
        }

        byte[] ciphertext = new byte[plaintext.length];
        byte[] previous = iv.clone();
        Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");

        for (int i = 0; i < plaintext.length; i += 16) {
            byte[] block = new byte[16];
            System.arraycopy(plaintext, i, block, 0, Math.min(16, plaintext.length - i));

            // XOR with the previous ciphertext block (IV for the first block)
            byte[] xorBlock = xorBytes(block, previous);

            // Encrypt the block using AES-128-ECB
            SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            byte[] encryptedBlock = cipher.doFinal(xorBlock);

            System.arraycopy(encryptedBlock, 0, ciphertext, i, encryptedBlock.length);
            previous = encryptedBlock;
        }

        return ciphertext;
    }

    public String decrypt(String string) throws Exception {
        switch (version) {
            case 11:
                return decryptEleven(string);
            case 12:
                return decryptTwelve(string);
            default:
                throw new IllegalArgumentException("Unsupported version");
        }
    }

    private String decryptEleven(String upperString) throws Exception {
        byte[] stringBytes = hexStringToByteArray(upperString.toLowerCase());

        int round = stringBytes.length / 8;
        byte lastBlock = stringBytes.length >= 8 ? stringBytes[stringBytes.length - 8] : 0;
        StringBuilder result = new StringBuilder();
        byte[] currentVector = blowIv.clone();

        for (int i = 0; i < round; i++) {
            byte[] encryptedBlock = new byte[8];
            System.arraycopy(stringBytes, i * 8, encryptedBlock, 0, 8);
            byte[] decryptedBlock = decryptBlock(encryptedBlock, "Blowfish/ECB/NoPadding");
            byte[] temp = xorBytes(decryptedBlock, currentVector);
            currentVector = xorBytes(currentVector, encryptedBlock);
            result.append(new String(temp, StandardCharsets.ISO_8859_1));
        }

        // Remove PKCS#5 padding from the last block
        int padding = lastBlock & 0xFF;
        if (padding >= 1 && padding <= 8) {
            result.setLength(result.length() - padding);
        }

        return result.toString();
    }

    private String decryptTwelve(String upperString) throws Exception {
        byte[] stringBytes = hexStringToByteArray(upperString.toLowerCase());
        byte[] plaintext = sodiumDecrypt(stringBytes, aesKeyStr.getBytes(StandardCharsets.ISO_8859_1), aesIvStr.getBytes(StandardCharsets.ISO_8859_1));

        // Remove PKCS#7 padding
        int padding = plaintext[plaintext.length - 1] & 0xFF;
        if (padding >= 1 && padding <= 16) {
            plaintext = java.util.Arrays.copyOf(plaintext, plaintext.length - padding);
        }

        return new String(plaintext, StandardCharsets.ISO_8859_1);
    }

    private byte[] sodiumDecrypt(byte[] ciphertext, byte[] key, byte[] iv) throws Exception {
        if (key.length != 16 || iv.length != 16) {
            throw new IllegalArgumentException("Invalid key or IV length");
        }

        byte[] plaintext = new byte[ciphertext.length];
        byte[] previous = iv.clone();
        Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");

        for (int i = 0; i < ciphertext.length; i += 16) {
            byte[] block = new byte[16];
            System.arraycopy(ciphertext, i, block, 0, Math.min(16, ciphertext.length - i));

            // Decrypt the block using AES-128-ECB
            SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
            byte[] decryptedBlock = cipher.doFinal(block);

            // XOR with the previous ciphertext block (IV for the first block)
            byte[] xorBlock = xorBytes(decryptedBlock, previous);

            System.arraycopy(xorBlock, 0, plaintext, i, xorBlock.length);
            previous = block;
        }

        return plaintext;
    }

    private byte[] encryptBlock(byte[] block, String algorithm) throws Exception {
        Cipher cipher = Cipher.getInstance(algorithm);
        SecretKeySpec secretKeySpec = new SecretKeySpec(blowKey, "Blowfish");
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
        return cipher.doFinal(block);
    }

    private byte[] decryptBlock(byte[] block, String algorithm) throws Exception {
        Cipher cipher = Cipher.getInstance(algorithm);
        SecretKeySpec secretKeySpec = new SecretKeySpec(blowKey, "Blowfish");
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
        return cipher.doFinal(block);
    }

    private byte[] xorBytes(byte[] str1, byte[] str2) {
        byte[] result = new byte[str1.length];
        for (int i = 0; i < str1.length; i++) {
            result[i] = (byte) (str1[i] ^ str2[i]);
        }
        return result;
    }

    private String toHexString(byte[] bytes) {
        StringBuilder hexString = new StringBuilder();
        for (byte b : bytes) {
            String hex = Integer.toHexString(0xFF & b);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }

    private byte[] hexStringToByteArray(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                    + Character.digit(s.charAt(i+1), 16));
        }
        return data;
    }

    private String sha1(String input) {
        try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance("SHA-1");
            byte[] messageDigest = md.digest(input.getBytes(StandardCharsets.ISO_8859_1));
            StringBuilder hexString = new StringBuilder();
            for (byte b : messageDigest) {
                String hex = Integer.toHexString(0xFF & b);
                if (hex.length() == 1) {
                    hexString.append('0');
                }
                hexString.append(hex);
            }
            return hexString.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) throws Exception {
        // 需要指定版本两种，11或12
        // NavicatPassword navicatPassword = new NavicatPassword(11);
        NavicatPassword navicatPassword = new NavicatPassword(12);

        // 解密
        String decode = navicatPassword.decrypt("47C7C7A6041AF991F58DEFB22A6384EE");
        System.out.println(decode);
    }
}