node crypto sha192 翻译为java

• http://www.oracle.com/technetwork/java/javase/downloads/index.html#other 下载“Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files for JDK/JRE 8”。下载后解压，覆盖$JAVA_HOME/jre/lib/security/里的同名包。

• 引入包：maven配置
  
org.bouncycastle
bcprov-jdk15on
1.54


• 代码：`

import java.security.MessageDigest;
import java.security.Security;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Main {

public static void main(String[] args) throws Throwable {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    String node_secret = "fuck_world"; // 对应node的第2个参数 crypto.createDecipher('aes192', secret)

    MessageDigest md5 = MessageDigest.getInstance("md5");

    // 参数说明 http://nodejs.cn/doc/nodejs_4/all.html#all_crypto_createcipher_algorithm_password
    byte[][] evp_BytesToKey = EVP_BytesToKey(192/8, 16, md5, null, node_secret.getBytes(), 1);
    byte[] KEY_EVP = evp_BytesToKey[0];
    byte[] IV_EVP = evp_BytesToKey[1];
    IvParameterSpec ivp = new IvParameterSpec(Arrays.copyOf(IV_EVP, IV_EVP.length));
    SecretKeySpec secretKey = new SecretKeySpec(Arrays.copyOf(KEY_EVP, KEY_EVP.length), "AES/CBC/PKCS5Padding");

    String content = "美丽的错误";

    //加密
    Cipher encryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    encryptCipher.init(Cipher.ENCRYPT_MODE, secretKey, ivp);
    byte[] encryptedByte = encryptCipher.doFinal(content.getBytes());
    String encryptedByteHexStr = org.bouncycastle.util.encoders.Hex.toHexString(encryptedByte);
    System.out.println(encryptedByteHexStr);

    // 解密
    byte[] byte0 = org.bouncycastle.util.encoders.Hex.decode(encryptedByteHexStr);
    Cipher decryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    decryptCipher.init(Cipher.DECRYPT_MODE, secretKey, ivp);
    byte[] byte1 = decryptCipher.doFinal(byte0);
    System.out.println(new String(byte1));
}

/**
 * Thanks go to Ola Bini for releasing this source on his blog. The source was obtained from
 * here
 * 
原node的C代码
 * 
原openssl的C代码
 */
private static byte[][] EVP_BytesToKey(
        int key_len, int iv_len, MessageDigest md, byte[] salt, byte[] data, int count) {
    byte[][] both = new byte[2][];
    byte[] key = new byte[key_len];
    int key_ix = 0;
    byte[] iv = new byte[iv_len];
    int iv_ix = 0;
    both[0] = key;
    both[1] = iv;
    byte[] md_buf = null;
    int nkey = key_len;
    int niv = iv_len;
    int i = 0;
    if (data == null) {
        return both;
    }
    int addmd = 0;
    for (;;) {
        md.reset();
        if (addmd++ > 0) {
            md.update(md_buf);
        }
        md.update(data);
        if (null != salt) {
            md.update(salt, 0, 8);
        }
        md_buf = md.digest();
        for (i = 1; i < count; i++) {
            md.reset();
            md.update(md_buf);
            md_buf = md.digest();
        }
        i = 0;
        if (nkey > 0) {
            for (;;) {
                if (nkey == 0)
                    break;
                if (i == md_buf.length)
                    break;
                key[key_ix++] = md_buf[i];
                nkey--;
                i++;
            }
        }
        if (niv > 0 && i != md_buf.length) {
            for (;;) {
                if (niv == 0)
                    break;
                if (i == md_buf.length)
                    break;
                iv[iv_ix++] = md_buf[i];
                niv--;
                i++;
            }
        }
        if (nkey == 0 && niv == 0) {
            break;
        }
    }
    for (i = 0; i < md_buf.length; i++) {
        md_buf[i] = 0;
    }
    return both;
}

}`