javascript - 加密和解密最初是 JSON 的对象

Question

我正在尝试加密一个 JSON 对象，为了做到这一点，我首先将其转换为字符串，对其进行加密，当解密时，它会以随机符号的形式返回，因为它无法转换它。

我尝试加密:

 { a: 'A',
 L: 'GET ALL USERS',
   Po: 
     { ttp: 'localhost:3000/ttp/allusers',
     b: 'localhost:8000/server/allusers',
     Mhash: '6d2e5cc3a67ae82ae7edf6fb6054f977' } }


var mensajeToBbignum = bignum.fromBuffer(new Buffer(x));
    console.log('\n\n\nCleartext:',  
mensajeToBbignum.toBuffer().toString(),'\n');
   var mensajeToBcrip = keys2.publicKey.encrypt(mensajeToBbignum);
console.log('encryption with public:', '\n',      
mensajeToBcrip.toBuffer().toString('base64'), '\n');

从字符串到加密我有以下内容:

{"a":"A","L":"GET ALL USERS","Po":{"ttp":"localhost:3000/ttp/allusers","b":"localhost:8000/server/allusers","Mhash":"6d2e5cc3a67ae82ae7edf6fb6054f977"}}

最后以base64编码:

 augf1Fuv2GwOYy0aipv1u6LZ3nWvGVz4M9JoA8uhlJgbuoGtYxe0GLSW+u6s1/kiOIqeF0s0cmCFgzpj/oKdF+0k9+OC/TVBgmk+1mO19pWnhcfS42j5OKPpy27mx0tRymQcS7TVDDsak2JptEv7O3POAvWVAKZRJ13zGMwP4qU=

我知道它使用以下代码接收到相同的 base64 字符串:

var recibidoBignum = bignum(req.body.mensaje);
console.log('recibidoBignum:', '\n',   
recibidoBignum.toBuffer().toString('base64'), '\n');
var reqdecrip = keys.privateKey.decrypt(recibidoBignum);
console.log('decryption with private:', '\n', reqdecrip.toBuffer().toString(), '\n\n\n\n\n\n');

以及以下日志:

encryption with public: 

augf1Fuv2GwOYy0aipv1u6LZ3nWvGVz4M9JoA8uhlJgbuoGtYxe0GLSW+u6s1/kiOIqeF0s0cmCFgzpj/oKdF+0k9+OC/TVBgmk+1mO19pWnhcfS42j5OKPpy27mx0tRymQcS7TVDDsak2JptEv7O3POAvWVAKZRJ13zGMwP4qU= 

decryption with private: 
�8����P�`��t�>  �x)���m��S���n�l� �:�17^�����l�}%��綷K�N�Y�a-5��J���p���8�@�b�Vs� 

看来它可以加密 JSON 对象，但无法解密

唯一使用的外部模块是bignum，rsa实现如下

rsa = {
    publicKey: function(bits, n, e) {
        this.bits = bits;
        this.n = n;
        this.e = e;
    },
    privateKey: function(p, q, d, publicKey) {
        this.p = p;
        this.q = q;
        this.d = d;
        this.publicKey = publicKey;
    },
    generateKeys: function(bitlength) {
        var p, q, n, phi, e, d, keys = {};
        // if p and q are bitlength/2 long, n is then bitlength long
        this.bitlength = bitlength || 2048;
        console.log("Generating RSA keys of", this.bitlength, "bits");
        p = bignum.prime(this.bitlength / 2);
        do {
            q = bignum.prime(this.bitlength / 2);
        } while (q.cmp(p) === 0);
        n = p.mul(q);

        phi = p.sub(1).mul(q.sub(1));

        e = bignum(65537);
        d = e.invertm(phi);

        keys.publicKey = new rsa.publicKey(this.bitlength, n, e);
        keys.privateKey = new rsa.privateKey(p, q, d, keys.publicKey);
        return keys;
    }
    };


rsa.publicKey.prototype = {
    encrypt: function(m) {
        return m.powm(this.e, this.n);
    },
    decrypt: function(c) {
        return c.powm(this.e, this.n);
    }
};

rsa.privateKey.prototype = {
    encrypt: function(m) {
        return m.powm(this.d, this.publicKey.n);
    },
    decrypt: function(c) {
        return c.powm(this.d, this.publicKey.n);
    }
};

module.exports = rsa;

Answer 1

这是一个编码问题。 bignum(s) 假设 s 是 Base 10 的整数，但根据您的描述 req.body.mensaje 是 Base 64 编码的var recibidoBignum = bignum(req.body.mensaje); 中的字符串。

完整代码如下:

var bignum = require("bignum");

var rsa = {
    publicKey: function(bits, n, e) {
        this.bits = bits;
        this.n = n;
        this.e = e;
    },
    privateKey: function(p, q, d, publicKey) {
        this.p = p;
        this.q = q;
        this.d = d;
        this.publicKey = publicKey;
    },
    generateKeys: function(bitlength) {
        var p, q, n, phi, e, d, keys = {};
        // if p and q are bitlength/2 long, n is then bitlength long
        this.bitlength = bitlength || 2048;
        console.log("Generating RSA keys of " + this.bitlength + " bits");
        p = bignum.prime(this.bitlength / 2);
        do {
            q = bignum.prime(this.bitlength / 2);
        } while (q.cmp(p) === 0);
        n = p.mul(q);

        phi = p.sub(1).mul(q.sub(1));

        e = bignum(65537);
        d = e.invertm(phi);

        keys.publicKey = new rsa.publicKey(this.bitlength, n, e);
        keys.privateKey = new rsa.privateKey(p, q, d, keys.publicKey);
        return keys;
    }
};


rsa.publicKey.prototype = {
    encrypt: function(m) {
        return m.powm(this.e, this.n);
    },
    decrypt: function(c) {
        return c.powm(this.e, this.n);
    }
};

rsa.privateKey.prototype = {
    encrypt: function(m) {
        return m.powm(this.d, this.publicKey.n);
    },
    decrypt: function(c) {
        return c.powm(this.d, this.publicKey.n);
    }
};

var keys = rsa.generateKeys(2048);

var pt = '{"a":"A","L":"GET ALL USERS","Po":{"ttp":"localhost:3000/ttp/allusers","b":"localhost:8000/server/allusers","Mhash":"6d2e5cc3a67ae82ae7edf6fb6054f977"}}';

console.log("Plaintext: " + pt);

var mensajeToBbignum = bignum.fromBuffer(new Buffer(pt));
var mensajeToBcrip = keys.publicKey.encrypt(mensajeToBbignum);
var ct = mensajeToBcrip.toBuffer().toString('base64');

console.log("Ciphertext: " + ct);

var recibidoBignum = bignum.fromBuffer(new Buffer(ct, "base64"));
var reqdecrip = keys.privateKey.decrypt(recibidoBignum);
console.log('Recovered plaintext: ' + reqdecrip.toBuffer().toString());

Runnable Demo