用Javascript实现AES的加密与解密,密钥长度128位(16字节)

当密钥长度在01字节到16字节时[8,128]Bits,密钥以0x00填充满16字节.

当密钥长度在16字节到24字节时(128,192]Bits,密钥以0x00填充满24字节.

当密钥长度在24字节到32字节时(192,256]Bits,密钥以0x00填充满32字节.

当密钥长度超过32字节时(256,+∞)Bits,密钥只取前32字节(128Bits).

仅支持ASCII字符.采用ECB模式加密

注:本代码来源于网络,对其进行了适当的修改,使其能够正确的工作

使用方法:

var test = new AES.Crypto('My Password');//已My Password为密钥建立一个新的AES.Crypto对象.

test.encrypt('123');//返回一个16进制字符串,为使用相应密钥加密字符串123的结果

test.decrypt('98152411195aece9493e712be2f22b8a');//返回使用密钥解密相应密文后的明文信息

var 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],
    Invsbox: [0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d],
    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]],
    cipher: function(input, w) {
        var nb = 4;
        var nr = w.length / nb - 1;
        var state = [new Array(nb), new Array(nb), new Array(nb), new Array(nb)];
        var output = new Array(4 * nb);
        var i, round;
        for (i = 0; i < input.length; i++) {
            state[i % 4][Math.floor(i / 4)] = input[i];
        }
        this.addRoundKey(state, w, 0, nb);
        for (round = 1; round < nr; round++) {
            this.subBytes(state, nb, 0);
            this.shiftRows(state, nb, 0);
            this.mixColumns(state, nb, 0);
            this.addRoundKey(state, w, round, nb);
        }
        this.subBytes(state, nb, 0);
        this.shiftRows(state, nb, 0);
        this.addRoundKey(state, w, nr, nb);
        for (i = 0; i < output.length; i++) {
            output[i] = state[i % 4][Math.floor(i / 4)];
        }
        return output;
    },
    Invcipher: function(input, w) {
        var nb = 4;
        var nr = w.length / nb - 1;
        var state = [new Array(nb), new Array(nb), new Array(nb), new Array(nb)];
        var output = new Array(4 * nb);
        var i, round;
        for (i = 0; i < input.length; i++) {
            state[i % 4][Math.floor(i / 4)] = input[i];
        }
        this.addRoundKey(state, w, nr, nb);
        for (round = nr - 1; round >= 1; round--) {
            this.shiftRows(state, nb, 1);
            this.subBytes(state, nb, 1);
            this.addRoundKey(state, w, round, nb);
            this.mixColumns(state, nb, 1);
        }
        this.shiftRows(state, nb, 1);
        this.subBytes(state, nb, 1);
        this.addRoundKey(state, w, round, nb);
        for (i = 0; i < output.length; i++) {
            output[i] = state[i % 4][Math.floor(i / 4)];
        }
        return output;
    },
    subBytes: function(state, nb, type) {
        var r, c;
        var type = type || 0;
        var tempBox = type === 0 ? this.sbox: this.Invsbox;
        for (c = 0; c < nb; c++) {
            for (r = 0; r < 4; r++) {
                state[r][c] = tempBox[state[r][c]];
            }
        }
    },
    shiftRows: function(state, nb, type) {
        var temp = new Array(nb);
        var type = type || 0;
        var r, c;
        type = type === 0 ? 1 : -1;
        for (r = 1; r < 4; r++) {
            for (c = 0; c < nb; c++) {
                temp[c] = state[r][(c + r * type + nb) % nb];
            }
            for (c = 0; c < 4; c++) {
                state[r][c] = temp[c];
            }
        }
    },
    mixColumns: function(state, nb, type) {
        var r, c, i;
        var t = new Array(nb);
        var n = [[0x02, 0x03, 0x01, 0x01], [0x0e, 0x0b, 0x0d, 0x09]];
        for (c = 0; c < nb; c++) {
            for (r = 0; r < 4; r++) {
                t[r] = state[r][c];
            }
            for (r = 0; r < 4; r++) {
                state[r][c] = 0;
                for (i = 0; i < 4; i++) {
                    state[r][c] ^= this.FFmul(n[type][i], t[(r + i) % 4]);
                }
            }
        }
    },
    FFmul: function(a, b) {
        var bw = new Array(4);
        var res = 0;
        var i;
        bw[0] = b;
        for (i = 1; i < 4; i++) {
            bw[i] = bw[i - 1] << 1;
            if (bw[i - 1] & 0x80) {
                bw[i] ^= 0x11b;
            }
        }
        for (i = 0; i < 4; i++) {
            if ((a >> i) & 0x01) {
                res ^= bw[i];
            }
        }
        return res;
    },
    addRoundKey: function(state, w, round, nb) {
        var r, c;
        for (c = 0; c < nb; c++) {
            for (r = 0; r < 4; r++) {
                state[r][c] ^= w[round * 4 + c][r];
            }
        }
    },
    keyExpansion: function(key) {
        var nk = key.length / 4;
        var nb = 4;
        var nr = nk + 6;
        var w = new Array(nb * (nr + 1));
        var temp = new Array(4);
        var i, j;
        for (i = 0; i < nk; i++) {
            w[i] = [key[4 * i], key[4 * i + 1], key[4 * i + 2], key[4 * i + 3]];
        }
        for (i = nk; i < w.length; i++) {
            w[i] = new Array(4);
            for (j = 0; j < 4; j++) {
                temp[j] = w[i - 1][j];
            }
            if (i % nk === 0) {
                this.rotWord(temp);
                this.subWord(temp);
                for (j = 0; j < 4; j++) {
                    temp[j] ^= AES.rcon[i / nk][j];
                }
            } else if (nk > 6 && i % nk === 4) {
                this.subWord(temp);
            }
            for (j = 0; j < 4; j++) {
                w[i][j] = w[i - nk][j] ^ temp[j];
            }
        }
        return w;
    },
    rotWord: function(w) {
        var temp = w[0];
        var i;
        for (i = 0; i < 3; i++) {
            w[i] = w[i + 1];
        }
        w[3] = temp;
    },
    subWord: function(w) {
        var i;
        for (i = 0; i < 4; i++) {
            w[i] = this.sbox[w[i]];
        }
    }
};
AES.Crypto = function(key) {
    this.String2Array = function(input, block) {
        var i;
        if (block != null) {
            var output = new Array(16);
            for (i = 0; i < 16; i++) {
                output[i] = input.charCodeAt(16 * block + i) || 0;
            }
        } else {
            var realLength = input.length <= 16 ? 16 : input.length <= 24 ? 24 : 32;
            var output = new Array(realLength);
            for (i = 0; i < realLength; i++) {
                output[i] = input.charCodeAt(i) || 0;
            }
        }
        return output;
    }
    this.Byte2Char = function(input) {
        var i;
        var output = '';
        for (i = 0; i < input.length / 2; i++) {
            output += String.fromCharCode(parseInt(input[i * 2], 16) * 16 + parseInt(input[i * 2 + 1], 16));
        }
        return output;
    }
    this.encrypt = function(input) {
        var blockCount = Math.ceil(input.length / blockSize);
        var output = new Array();
        var counterBlock, byteCount, offset;
        var block, c;
        for (block = 0; block < blockCount; block++) {
            counterBlock = AES.cipher(this.String2Array(input, block), this.keySchedule);
            offset = block * blockSize;
            for (c = 0; c < 16; c++) {
                output[offset + c] = counterBlock[c] < 16 ? ('0' + counterBlock[c].toString(16)) : counterBlock[c].toString(16);
            }
        }
        return output.join("");
    };
    this.decrypt = function(input) {
        var blockCount = Math.ceil(input.length / blockSize * 0.5);
        var output = new Array();
        var counterBlock, byteCount, offset;
        var block, c;
        input = this.Byte2Char(input);
        for (block = 0; block < blockCount; block++) {
            counterBlock = AES.Invcipher(this.String2Array(input, block), this.keySchedule);
                        offset = block*blockSize;
            for (c = 0; c < 16 && counterBlock[c] != 0; c++) {
                output[offset + c] = String.fromCharCode(counterBlock[c]);
            }
        }
        return output.join("");
    };
    var blockSize = 16;
    this.key = this.String2Array(key, null);
    this.keySchedule = AES.keyExpansion(this.key);
};

本文来自http://blog.sina.com.cn/s/blog_a9d3c71c0101ds37.html