## DataProcess 数据加解密

### 使用指南
``` javascript
import { DataProcess } from '@varied/mobile';

Vue.use(DataProcess);
```

### 代码演示


#### des加密

``` javascript
// 加解密秘钥
let firstKey = '123';
let secondKey = 'faada';
let thirdKey = '131';
let result = this.$DataProcess.desEncrypt('需要加密的数据', firstKey, secondKey, thirdKey);
```

#### des解密

``` javascript
// 加解密秘钥
let firstKey = '123';
let secondKey = 'faada';
let thirdKey = '131';
let result = this.$DataProcess.desDecrypt('需要解密的数据', firstKey, secondKey, thirdKey);
```

#### aes加密

``` javascript
// 加解密秘钥
let privateKey = '123';
let nBits = 128;
let result = this.$DataProcess.aesEncrypt('需要加密的数据', privateKey, nBits);
```

#### aes解密

``` javascript
// 加解密秘钥
let privateKey = '123';
let nBits = 128;
let result = this.$DataProcess.aesDecrypt('需要解密的数据', privateKey, nBits);
```

#### ras加密

``` javascript
// 公钥
let module = 'a5261939975948bb7a58dffe5ff54e65f0498f9175f5a09288810b8975871e99af3b5dd94057b0fc07535f5f97444504fa35169d461d0d30cf0192e307727c065168c788771c561a9400fb49175e9e6aa4e23fe11af69e9412dd23b0cb6684c4c2429bce139e848ab26d0829073351f4acd36074eafd036a5eb83359d2a698d3';
let empoent = '10001';
this.$DataProcess.setPublic(module, empoent);
let result = this.$DataProcess.rsaEncrypt('需要加密的数据');
```

#### ras解密

``` javascript
// 公钥
let module = 'a5261939975948bb7a58dffe5ff54e65f0498f9175f5a09288810b8975871e99af3b5dd94057b0fc07535f5f97444504fa35169d461d0d30cf0192e307727c065168c788771c561a9400fb49175e9e6aa4e23fe11af69e9412dd23b0cb6684c4c2429bce139e848ab26d0829073351f4acd36074eafd036a5eb83359d2a698d3';
let empoent = '10001';
// 私钥
let privateKey = '8e9912f6d3645894e8d38cb58c0db81ff516cf4c7e5a14c7f1eddb1459d2cded4d8d293fc97aee6aefb861859c8b6a3d1dfe710463e1f9ddc72048c09751971c4a580aa51eb523357a3cc48d31cfad1d4a165066ed92d4748fb6571211da5cb14bc11b6e2df7c1a559e6d5ac1cd5c94703a22891464fba23d0d965086277a161';
this.$DataProcess.setPrivate(module, empoent, privateKey);
let result = this.$DataProcess.rsaDecrypt('需要解密的数据');
```
#### rsa秘钥生成
``` javascript
package com.xxx.common.crypto;
 
import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
 
 
public class RSAUtil {
    private static final int MAX_ENCRYPT_BLOCK = 117; // RSA最大加密明文大小
    private static final int MAX_DECRYPT_BLOCK = 128; // RSA最大解密密文大小
 
    /**
     * 生成公钥和私钥
     *
     * @throws NoSuchAlgorithmException
     */
    public static KeyPair genRSAKeyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        keyPairGen.initialize(1024);
        return keyPairGen.generateKeyPair();
    }
 
    /**
     * 使用模和指数生成RSA公钥
     * 注意：【此代码用了默认补位方式，为RSA/None/PKCS1Padding，不同JDK默认的补位方式可能不同，如Android默认是RSA
     * /None/NoPadding】
     *
     * @param modulus  模
     * @param exponent 指数
     * @return
     */
    public static RSAPublicKey getPublicKey(String modulus, String exponent) {
        try {
            BigInteger b1 = new BigInteger(modulus, 16);
            BigInteger b2 = new BigInteger(exponent, 16);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            RSAPublicKeySpec keySpec = new RSAPublicKeySpec(b1, b2);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    /**
     * 使用模和指数生成RSA私钥
     * 注意：【此代码用了默认补位方式，为RSA/None/PKCS1Padding，不同JDK默认的补位方式可能不同，如Android默认是RSA
     * /None/NoPadding】
     *
     * @param modulus  模
     * @param exponent 指数
     * @return
     */
    public static RSAPrivateKey getPrivateKey(String modulus, String exponent) {
        try {
            BigInteger b1 = new BigInteger(modulus, 16);
            BigInteger b2 = new BigInteger(exponent, 16);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(b1, b2);
            return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    /**
     * 公钥加密
     */
    public static byte[] encryptByPublicKey(byte[] data, RSAPublicKey publicKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int inputLen = data.length;
 
        try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            int offSet = 0;
            byte[] cache;
            int i = 0;
            // 对数据分段加密
            while (inputLen - offSet > 0) {
                if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                    cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_ENCRYPT_BLOCK;
            }
            return out.toByteArray();
        }
    }
 
    /**
     * 私钥解密
     */
    public static byte[] decryptByPrivateKey(byte[] encryptedData, RSAPrivateKey privateKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        int inputLen = encryptedData.length;
 
        try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
 
            int offSet = 0;
            byte[] cache;
            int i = 0;
 
            // 对数据分段解密
            while (inputLen - offSet > 0) {
                if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                    cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_DECRYPT_BLOCK;
            }
            return out.toByteArray();
        }
    }
 
    /**
     * ASCII码转BCD码
     */
    public static byte[] ASCII_To_BCD(byte[] ascii, int asc_len) {
        byte[] bcd = new byte[asc_len / 2];
        int j = 0;
        for (int i = 0; i < (asc_len + 1) / 2; i++) {
            bcd[i] = asc_to_bcd(ascii[j++]);
            bcd[i] = (byte) (((j >= asc_len) ? 0x00 : asc_to_bcd(ascii[j++])) + (bcd[i] << 4));
        }
        return bcd;
    }
 
    public static byte asc_to_bcd(byte asc) {
        byte bcd;
 
        if ((asc >= '0') && (asc <= '9'))
            bcd = (byte) (asc - '0');
        else if ((asc >= 'A') && (asc <= 'F'))
            bcd = (byte) (asc - 'A' + 10);
        else if ((asc >= 'a') && (asc <= 'f'))
            bcd = (byte) (asc - 'a' + 10);
        else
            bcd = (byte) (asc - 48);
        return bcd;
    }
 
    /**
     * BCD转字符串
     */
    public static String bcd2Str(byte[] bytes) {
        char temp[] = new char[bytes.length * 2], val;
 
        for (int i = 0; i < bytes.length; i++) {
            val = (char) (((bytes[i] & 0xf0) >> 4) & 0x0f);
            temp[i * 2] = (char) (val > 9 ? val + 'A' - 10 : val + '0');
 
            val = (char) (bytes[i] & 0x0f);
            temp[i * 2 + 1] = (char) (val > 9 ? val + 'A' - 10 : val + '0');
        }
        return new String(temp);
    }
 
    /**
     * 拆分字符串
     */
    public static String[] splitString(String string, int len) {
        int x = string.length() / len;
        int y = string.length() % len;
        int z = 0;
        if (y != 0) {
            z = 1;
        }
        String[] strings = new String[x + z];
        String str = "";
        for (int i = 0; i < x + z; i++) {
            if (i == x + z - 1 && y != 0) {
                str = string.substring(i * len, i * len + y);
            } else {
                str = string.substring(i * len, i * len + len);
            }
            strings[i] = str;
        }
        return strings;
    }
 
    /**
     * 拆分数组
     */
    public static byte[][] splitArray(byte[] data, int len) {
        int x = data.length / len;
        int y = data.length % len;
        int z = 0;
        if (y != 0) {
            z = 1;
        }
        byte[][] arrays = new byte[x + z][];
        byte[] arr;
        for (int i = 0; i < x + z; i++) {
            arr = new byte[len];
            if (i == x + z - 1 && y != 0) {
                System.arraycopy(data, i * len, arr, 0, y);
            } else {
                System.arraycopy(data, i * len, arr, 0, len);
            }
            arrays[i] = arr;
        }
        return arrays;
    }
 
    public static void main(String[] args) throws Exception {
        KeyPair keyPair = genRSAKeyPair();
 
        //生成公钥和私钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
 
 
        //模hex
        String modulus = publicKey.getModulus().toString(16);
 
        //公钥指数hex
        String public_exponent = publicKey.getPublicExponent().toString(16);
        //私钥指数hex
        String private_exponent = privateKey.getPrivateExponent().toString(16);
 
        System.err.println("public_modulus: " + modulus);
        System.err.println("public_exponent: " + public_exponent);
        System.err.println("private_exponent: " + private_exponent);
 
        //明文
        String plaintStr = "test就撒3242旦立刻反击啊是！@#￥#%……￥#%43";
        System.err.println("plaintStr: " + plaintStr);
 
        //使用模和指数生成公钥和私钥
        RSAPublicKey pubKey = getPublicKey(modulus, public_exponent);
        RSAPrivateKey priKey = getPrivateKey(modulus, private_exponent);
 
        //公钥加密后的密文
        byte[] encryptStr = encryptByPublicKey(plaintStr.getBytes("utf-8"), pubKey);
        System.err.println("encryptStr: " + HexUtil.bytesToHexString(encryptStr));
 
        //私钥解密后的明文
        byte[] decryptStr = decryptByPrivateKey(encryptStr, priKey);
        System.err.println("decryptStr: " + new String(decryptStr, "utf-8"));
    }
 
}
```
