java - 这个 AES JavaScript 函数中的 IV 是什么？

Question

我正在尝试使用 JavaScript 库来加密数据并将其发送到基于 Java 的服务器，在那里可以解密数据。

我遇到的问题是，在查看 JavaScript 代码时，我只看到了 8 字节 IV 的证据，即使 Java 需要 16 字节 IV :-P。

是否可以让 Java 解码从 JavaScript 发送的内容，或者修改 JavaScript 以便可以做到？这绝对超出了我的加密能力 :-P。

脚本可在此处获得: enter link description here

我稍微修改过的版本如下:

我一直在尝试不同的 Java 代码的当前版本在这里:

package com.myclass.util;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.spec.InvalidParameterSpecException;
import java.util.regex.Pattern;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

   public class AES {
       private static Charset PLAIN_TEXT_ENCODING = Charset.forName("UTF-8");
       private static String CIPHER_TRANSFORMATION = "AES/CTR/NoPadding";
       private static String KEY_TYPE = "AES";
       private static int KEY_SIZE_BITS = 128;

       private SecretKey key;
       private Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
       private byte[] ivBytes = new byte[KEY_SIZE_BITS/8];

       public AES() throws NoSuchAlgorithmException, NoSuchPaddingException, NoSuchProviderException, InvalidParameterSpecException, InvalidKeyException, InvalidAlgorithmParameterException{
           KeyGenerator kgen = KeyGenerator.getInstance(KEY_TYPE);
           kgen.init(KEY_SIZE_BITS); 
           key = kgen.generateKey();
           cipher.init(Cipher.ENCRYPT_MODE, key);
           ivBytes = cipher.getParameters().getParameterSpec(IvParameterSpec.class).getIV();
       }

       public String getIVAsHex(){
           return byteArrayToHexString(ivBytes);
       }

       public String getKeyAsHex(){
           return byteArrayToHexString(key.getEncoded());
       }

       public void setStringToKey(String keyText) throws NoSuchAlgorithmException, UnsupportedEncodingException{
           setKey(getHash(keyText));
       }

       public void setHexToKey(String hexKey){
           setKey(hexStringToByteArray(hexKey));
       }

       private void setKey(byte[] bArray){
           byte[] bText = new byte[KEY_SIZE_BITS/8];
           int end = Math.min(KEY_SIZE_BITS/8, bArray.length);
           System.arraycopy(bArray, 0, bText, 0, end);
           key = new SecretKeySpec(bText, KEY_TYPE);
       }

       public void setStringToIV(String ivText){
           setIV(ivText.getBytes());
       }

       public void setHexToIV(String hexIV){
           setIV(hexStringToByteArray(hexIV));
       }

       private void setIV(byte[] bArray){
           byte[] bText = new byte[KEY_SIZE_BITS/8];
           int end = Math.min(KEY_SIZE_BITS/8, bArray.length);
           System.arraycopy(bArray, 0, bText, 0, end);
           ivBytes = bText;
       }

        public String encrypt(String message) throws InvalidKeyException,
                IllegalBlockSizeException, BadPaddingException,
                InvalidAlgorithmParameterException {
            cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivBytes));
            byte[] encrypted = cipher.doFinal(message.getBytes(PLAIN_TEXT_ENCODING));
            String result = byteArrayToHexString(ivBytes).concat(byteArrayToHexString(encrypted).substring(2));
            return result;
        }

        public String decrypt(String hexCiphertext)
                throws IllegalBlockSizeException, BadPaddingException,
                InvalidKeyException, InvalidAlgorithmParameterException,
                UnsupportedEncodingException {
            byte[] dec = hexStringToByteArray(hexCiphertext);
            byte[] iv = new byte[16];
            System.arraycopy(dec, 0, iv, 0, 16);
            byte[] cText = new byte[dec.length - 16];
            System.arraycopy(dec, 16, cText, 0, cText.length);
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));

            byte[] decrypted = cipher.doFinal(cText);
            return new String(decrypted, PLAIN_TEXT_ENCODING);
        }

        private static String byteArrayToHexString(byte[] raw) {
            StringBuilder sb = new StringBuilder(2 + raw.length * 2);
            sb.append("0x");
            for (int i = 0; i < raw.length; i++) {
                sb.append(String.format("%02X", Integer.valueOf(raw[i] & 0xFF)));
            }
            return sb.toString();
        }

       private static byte[] hexStringToByteArray(String hex) {
            Pattern replace = Pattern.compile("^0x");
            String s = replace.matcher(hex).replaceAll("");

            byte[] b = new byte[s.length() / 2];
            for (int i = 0; i < b.length; i++){
              int index = i * 2;
              int v = Integer.parseInt(s.substring(index, index + 2), 16);
              b[i] = (byte)v;
            }
            return b;
       }
       private byte[] getHash(String password) throws NoSuchAlgorithmException, UnsupportedEncodingException {
           MessageDigest digest = MessageDigest.getInstance("SHA-256");
           digest.reset();
           return digest.digest(password.getBytes("UTF-8"));
        }

       public String getHashasHex(String password) throws UnsupportedEncodingException, NoSuchAlgorithmException{
           return byteArrayToHexString(getHash(password));
       }

   }


/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
/*  AES implementation in JavaScript (c) Chris Veness 2005-2011                                   */
/*   - see http://csrc.nist.gov/publications/PubsFIPS.html#197                                    */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */

var Aes = {};  // Aes namespace

/**
 * AES Cipher function: encrypt 'input' state with Rijndael algorithm
 *   applies Nr rounds (10/12/14) using key schedule w for 'add round key' stage
 *
 * @param {Number[]} input 16-byte (128-bit) input state array
 * @param {Number[][]} w   Key schedule as 2D byte-array (Nr+1 x Nb bytes)
 * @returns {Number[]}     Encrypted output state array
 */
Aes.cipher = function(input, w) {    // main Cipher function [§5.1]
  var Nb = 4;               // block size (in words): no of columns in state (fixed at 4 for AES)
  var Nr = w.length/Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys

  var state = [[],[],[],[]];  // initialise 4xNb byte-array 'state' with input [§3.4]
  for (var i=0; i<4*Nb; i++) state[i%4][Math.floor(i/4)] = input[i];

  state = Aes.addRoundKey(state, w, 0, Nb);

  for (var round=1; round<Nr; round++) {
    state = Aes.subBytes(state, Nb);
    state = Aes.shiftRows(state, Nb);
    state = Aes.mixColumns(state, Nb);
    state = Aes.addRoundKey(state, w, round, Nb);
  }

  state = Aes.subBytes(state, Nb);
  state = Aes.shiftRows(state, Nb);
  state = Aes.addRoundKey(state, w, Nr, Nb);

  var output = new Array(4*Nb);  // convert state to 1-d array before returning [§3.4]
  for (var i=0; i<4*Nb; i++) output[i] = state[i%4][Math.floor(i/4)];
  return output;
}

/**
 * Perform Key Expansion to generate a Key Schedule
 *
 * @param {Number[]} key Key as 16/24/32-byte array
 * @returns {Number[][]} Expanded key schedule as 2D byte-array (Nr+1 x Nb bytes)
 */
Aes.keyExpansion = function(key) {  // generate Key Schedule (byte-array Nr+1 x Nb) from Key [§5.2]
  var Nb = 4;            // block size (in words): no of columns in state (fixed at 4 for AES)
  var Nk = key.length/4  // key length (in words): 4/6/8 for 128/192/256-bit keys
  var Nr = Nk + 6;       // no of rounds: 10/12/14 for 128/192/256-bit keys

  var w = new Array(Nb*(Nr+1));
  var temp = new Array(4);

  for (var i=0; i<Nk; i++) {
    var r = [key[4*i], key[4*i+1], key[4*i+2], key[4*i+3]];
    w[i] = r;
  }

  for (var i=Nk; i<(Nb*(Nr+1)); i++) {
    w[i] = new Array(4);
    for (var t=0; t<4; t++) temp[t] = w[i-1][t];
    if (i % Nk == 0) {
      temp = Aes.subWord(Aes.rotWord(temp));
      for (var t=0; t<4; t++) temp[t] ^= Aes.rCon[i/Nk][t];
    } else if (Nk > 6 && i%Nk == 4) {
      temp = Aes.subWord(temp);
    }
    for (var t=0; t<4; t++) w[i][t] = w[i-Nk][t] ^ temp[t];
  }

  return w;
}

/*
 * ---- remaining routines are private, not called externally ----
 */

Aes.subBytes = function(s, Nb) {    // apply SBox to state S [§5.1.1]
  for (var r=0; r<4; r++) {
    for (var c=0; c<Nb; c++) s[r][c] = Aes.sBox[s[r][c]];
  }
  return s;
}

Aes.shiftRows = function(s, Nb) {    // shift row r of state S left by r bytes [§5.1.2]
  var t = new Array(4);
  for (var r=1; r<4; r++) {
    for (var c=0; c<4; c++) t[c] = s[r][(c+r)%Nb];  // shift into temp copy
    for (var c=0; c<4; c++) s[r][c] = t[c];         // and copy back
  }          // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES):
  return s;  // see asmaes.sourceforge.net/rijndael/rijndaelImplementation.pdf
}

Aes.mixColumns = function(s, Nb) {   // combine bytes of each col of state S [§5.1.3]
  for (var c=0; c<4; c++) {
    var a = new Array(4);  // 'a' is a copy of the current column from 's'
    var b = new Array(4);  // 'b' is a•{02} in GF(2^8)
    for (var i=0; i<4; i++) {
      a[i] = s[i][c];
      b[i] = s[i][c]&0x80 ? s[i][c]<<1 ^ 0x011b : s[i][c]<<1;

    }
    // a[n] ^ b[n] is a•{03} in GF(2^8)
    s[0][c] = b[0] ^ a[1] ^ b[1] ^ a[2] ^ a[3]; // 2*a0 + 3*a1 + a2 + a3
    s[1][c] = a[0] ^ b[1] ^ a[2] ^ b[2] ^ a[3]; // a0 * 2*a1 + 3*a2 + a3
    s[2][c] = a[0] ^ a[1] ^ b[2] ^ a[3] ^ b[3]; // a0 + a1 + 2*a2 + 3*a3
    s[3][c] = a[0] ^ b[0] ^ a[1] ^ a[2] ^ b[3]; // 3*a0 + a1 + a2 + 2*a3
  }
  return s;
}

Aes.addRoundKey = function(state, w, rnd, Nb) {  // xor Round Key into state S [§5.1.4]
  for (var r=0; r<4; r++) {
    for (var c=0; c<Nb; c++) state[r][c] ^= w[rnd*4+c][r];
  }
  return state;
}

Aes.subWord = function(w) {    // apply SBox to 4-byte word w
  for (var i=0; i<4; i++) w[i] = Aes.sBox[w[i]];
  return w;
}

Aes.rotWord = function(w) {    // rotate 4-byte word w left by one byte
  var tmp = w[0];
  for (var i=0; i<3; i++) w[i] = w[i+1];
  w[3] = tmp;
  return w;
}

// sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [§5.1.1]
Aes.sBox =  [0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
             0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
             0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
             0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
             0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
             0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
             0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
             0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
             0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
             0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
             0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
             0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
             0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
             0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
             0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
             0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16];

// rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [§5.2]
Aes.rCon = [ [0x00, 0x00, 0x00, 0x00],
             [0x01, 0x00, 0x00, 0x00],
             [0x02, 0x00, 0x00, 0x00],
             [0x04, 0x00, 0x00, 0x00],
             [0x08, 0x00, 0x00, 0x00],
             [0x10, 0x00, 0x00, 0x00],
             [0x20, 0x00, 0x00, 0x00],
             [0x40, 0x00, 0x00, 0x00],
             [0x80, 0x00, 0x00, 0x00],
             [0x1b, 0x00, 0x00, 0x00],
             [0x36, 0x00, 0x00, 0x00] ]; 


/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
/*  AES Counter-mode implementation in JavaScript (c) Chris Veness 2005-2011                      */
/*   - see http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf                       */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */

Aes.Ctr = {};  // Aes.Ctr namespace: a subclass or extension of Aes

/** 
 * Encrypt a text using AES encryption in Counter mode of operation
 *
 * Unicode multi-byte character safe
 *
 * @param {String} plaintext Source text to be encrypted
 * @param {String} password  The password to use to generate a key
 * @param {Number} nBits     Number of bits to be used in the key (128, 192, or 256)
 * @returns {string}         Encrypted text
 */
Aes.Ctr.encrypt = function(plaintext, password, nBits) {
  var blockSize = 16;  // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
  if (!(nBits==128 || nBits==192 || nBits==256)) return '';  // standard allows 128/192/256 bit keys
  plaintext = Utf8.encode(plaintext);
  password = Utf8.encode(password);
  //var t = new Date();  // timer

  var nBytes = nBits/8;  // no bytes in key (16/24/32)
  var hash = Sha256.hash(password);

  for (var i=0; i<nBytes; i++) {  // use 1st 16/24/32 chars of hash for key
    key[i] = isNaN(password.charCodeAt(i)) ? 0 : hash.charCodeAt(i);
  }

  // initialise 1st 8 bytes of counter block with nonce (NIST SP800-38A §B.2): [0-1] = millisec, 
  // [2-3] = random, [4-7] = seconds, together giving full sub-millisec uniqueness up to Feb 2106
  var counterBlock = new Array(blockSize);

  var nonce = (new Date()).getTime();  // timestamp: milliseconds since 1-Jan-1970
  var nonceMs = nonce%1000;
  var nonceSec = Math.floor(nonce/1000);
  var nonceRnd = Math.floor(Math.random()*0xffff);

  for (var i=0; i<2; i++) counterBlock[i]   = (nonceMs  >>> i*8) & 0xff;
  for (var i=0; i<2; i++) counterBlock[i+2] = (nonceRnd >>> i*8) & 0xff;
  for (var i=0; i<4; i++) counterBlock[i+4] = (nonceSec >>> i*8) & 0xff;

  // and convert it to a string to go on the front of the ciphertext
  var ctrTxt = '';
  for (var i=0; i<8; i++) ctrTxt += String.fromCharCode(counterBlock[i]);

  // generate key schedule - an expansion of the key into distinct Key Rounds for each round
  var keySchedule = Aes.keyExpansion(key);

  var blockCount = Math.ceil(plaintext.length/blockSize);
  var ciphertxt = new Array(blockCount);  // ciphertext as array of strings

  for (var b=0; b<blockCount; b++) {
    // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
    // done in two stages for 32-bit ops: using two words allows us to go past 2^32 blocks (68GB)
    for (var c=0; c<4; c++) counterBlock[15-c] = (b >>> c*8) & 0xff;
    for (var c=0; c<4; c++) counterBlock[15-c-4] = (b/0x100000000 >>> c*8)

    var cipherCntr = Aes.cipher(counterBlock, keySchedule);  // -- encrypt counter block --

    // block size is reduced on final block
    var blockLength = b<blockCount-1 ? blockSize : (plaintext.length-1)%blockSize+1;
    var cipherChar = new Array(blockLength);

    for (var i=0; i<blockLength; i++) {  // -- xor plaintext with ciphered counter char-by-char --
      cipherChar[i] = cipherCntr[i] ^ plaintext.charCodeAt(b*blockSize+i);
      cipherChar[i] = String.fromCharCode(cipherChar[i]);
    }
    ciphertxt[b] = cipherChar.join(''); 
  }

  // Array.join is more efficient than repeated string concatenation in IE
  var ciphertext = ctrTxt + ciphertxt.join('');
  ciphertext = stringToHex(ciphertext);  // encode in base64

  //alert((new Date()) - t);
  return ciphertext;
}

/** 
 * Decrypt a text encrypted by AES in counter mode of operation
 *
 * @param {String} ciphertext Source text to be encrypted
 * @param {String} password   The password to use to generate a key
 * @param {Number} nBits      Number of bits to be used in the key (128, 192, or 256)
 * @returns {String}          Decrypted text
 */
Aes.Ctr.decrypt = function(ciphertext, password, nBits) {
  var blockSize = 16;  // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
  if (!(nBits==128 || nBits==192 || nBits==256)) return '';  // standard allows 128/192/256 bit keys
  ciphertext = hexToString(ciphertext);
  password = Utf8.encode(password);
  //var t = new Date();  // timer

  // use SHA256 to hash password (mirroring encrypt routine)
  var nBytes = nBits/8;  // no bytes in key
  var hash = Sha256.hash(password);

  for (var i=0; i<nBytes; i++) {  // use 1st 16/24/32 chars of hash for key
    key[i] = isNaN(password.charCodeAt(i)) ? 0 : hash.charCodeAt(i);
  }

  // recover nonce from 1st 8 bytes of ciphertext
  var counterBlock = new Array(8);
  ctrTxt = ciphertext.slice(0, 8);
  for (var i=0; i<8; i++) counterBlock[i] = ctrTxt.charCodeAt(i);

  // generate key schedule
  var keySchedule = Aes.keyExpansion(key);

  // separate ciphertext into blocks (skipping past initial 8 bytes)
  var nBlocks = Math.ceil((ciphertext.length-8) / blockSize);
  var ct = new Array(nBlocks);
  for (var b=0; b<nBlocks; b++) ct[b] = ciphertext.slice(8+b*blockSize, 8+b*blockSize+blockSize);
  ciphertext = ct;  // ciphertext is now array of block-length strings

  // plaintext will get generated block-by-block into array of block-length strings
  var plaintxt = new Array(ciphertext.length);

  for (var b=0; b<nBlocks; b++) {
    // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
    for (var c=0; c<4; c++) counterBlock[15-c] = ((b) >>> c*8) & 0xff;
    for (var c=0; c<4; c++) counterBlock[15-c-4] = (((b+1)/0x100000000-1) >>> c*8) & 0xff;

    var cipherCntr = Aes.cipher(counterBlock, keySchedule);  // encrypt counter block

    var plaintxtByte = new Array(ciphertext[b].length);
    for (var i=0; i<ciphertext[b].length; i++) {
      // -- xor plaintxt with ciphered counter byte-by-byte --
      plaintxtByte[i] = cipherCntr[i] ^ ciphertext[b].charCodeAt(i);
      plaintxtByte[i] = String.fromCharCode(plaintxtByte[i]);
    }
    plaintxt[b] = plaintxtByte.join('');
  }

  // join array of blocks into single plaintext string
  var plaintext = plaintxt.join('');
  plaintext = Utf8.decode(plaintext);  // decode from UTF8 back to Unicode multi-byte chars

  //alert((new Date()) - t);
  return plaintext;
}

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
/*  Utf8 class: encode / decode between multi-byte Unicode characters and UTF-8 multiple          */
/*              single-byte character encoding (c) Chris Veness 2002-2011                         */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */

var Utf8 = {};  // Utf8 namespace

/**
 * Encode multi-byte Unicode string into utf-8 multiple single-byte characters 
 * (BMP / basic multilingual plane only)
 *
 * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
 *
 * @param {String} strUni Unicode string to be encoded as UTF-8
 * @returns {String} encoded string
 */
Utf8.encode = function(strUni) {
  // use regular expressions & String.replace callback function for better efficiency 
  // than procedural approaches
  var strUtf = strUni.replace(
      /[\u0080-\u07ff]/g,  // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
      function(c) { 
        var cc = c.charCodeAt(0);
        return String.fromCharCode(0xc0 | cc>>6, 0x80 | cc&0x3f); }
    );
  strUtf = strUtf.replace(
      /[\u0800-\uffff]/g,  // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
      function(c) { 
        var cc = c.charCodeAt(0); 
        return String.fromCharCode(0xe0 | cc>>12, 0x80 | cc>>6&0x3F, 0x80 | cc&0x3f); }
    );
  return strUtf;
}

/**
 * Decode utf-8 encoded string back into multi-byte Unicode characters
 *
 * @param {String} strUtf UTF-8 string to be decoded back to Unicode
 * @returns {String} decoded string
 */
Utf8.decode = function(strUtf) {
  // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
  var strUni = strUtf.replace(
      /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g,  // 3-byte chars
      function(c) {  // (note parentheses for precence)
        var cc = ((c.charCodeAt(0)&0x0f)<<12) | ((c.charCodeAt(1)&0x3f)<<6) | ( c.charCodeAt(2)&0x3f); 
        return String.fromCharCode(cc); }
    );
  strUni = strUni.replace(
      /[\u00c0-\u00df][\u0080-\u00bf]/g,                 // 2-byte chars
      function(c) {  // (note parentheses for precence)
        var cc = (c.charCodeAt(0)&0x1f)<<6 | c.charCodeAt(1)&0x3f;
        return String.fromCharCode(cc); }
    );
  return strUni;
}

function stringToHex (s) {
  var r = "0x";
  var hexes = new Array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
  for (var i=0; i<s.length; i++) {r += hexes [s.charCodeAt(i) >> 4] + hexes [s.charCodeAt(i) & 0xf];}
  return r;
}

function hexToString (h) {
  var r = "";
  for (var i= (h.substr(0, 2)=="0x")?2:0; i<h.length; i+=2) {r += String.fromCharCode (parseInt (h.substr (i, 2), 16));}
  return r;
}

感谢您的帮助!

Answer 1

从技术上讲是的，他们可以阅读对方写的东西。但是，Javascript 代码表示 InputVector (IV) 是 16 个字节:

* @param {Number[]} input 16-byte (128-bit) input state array

并且，Java 中有 128/8 = 16 个 IV 字节数组。所以你原来的问题似乎不是问题，因为两者都使用 16 字节 IV。

现在针对我看到的与您正在做的事情有关的所有问题。在客户端(网络浏览器)上加密是不安全的。你不能让它安全。 AES 是一种对称加密算法，需要两端的 key 相同。这意味着您必须在客户端和服务器之间共享该 secret 。这基本上意味着 key 必须是可见的，这样 Javascript 代码才能获得与服务器一致的 key 。您甚至可以通过 SSL 或其他方式传输它，但无论如何任何拥有浏览器的人都可以获取该 key 。更不用说它非常容易启动 Firebug 并从您的 Javascript 程序中获取我想要的任何东西。底线是使用 Javascript 加密数据是毫无意义的练习。如果您确实需要将客户端上的 secret 传输到服务器，请使用 SSL。它的设计是安全的，经过了实战测试，存在并且一直存在问题。但是，它们已经并将被修复。