mirror of https://github.com/moparisthebest/mail
113 lines
2.6 KiB
JavaScript
113 lines
2.6 KiB
JavaScript
// Depends on jsbn.js and rng.js
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// Version 1.1: support utf-8 encoding in pkcs1pad2
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// convert a (hex) string to a bignum object
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function parseBigInt(str,r) {
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return new BigInteger(str,r);
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}
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function linebrk(s,n) {
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var ret = "";
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var i = 0;
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while(i + n < s.length) {
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ret += s.substring(i,i+n) + "\n";
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i += n;
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}
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return ret + s.substring(i,s.length);
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}
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function byte2Hex(b) {
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if(b < 0x10)
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return "0" + b.toString(16);
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else
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return b.toString(16);
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}
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// PKCS#1 (type 2, random) pad input string s to n bytes, and return a bigint
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function pkcs1pad2(s,n) {
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if(n < s.length + 11) { // TODO: fix for utf-8
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alert("Message too long for RSA");
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return null;
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}
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var ba = new Array();
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var i = s.length - 1;
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while(i >= 0 && n > 0) {
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var c = s.charCodeAt(i--);
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if(c < 128) { // encode using utf-8
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ba[--n] = c;
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}
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else if((c > 127) && (c < 2048)) {
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ba[--n] = (c & 63) | 128;
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ba[--n] = (c >> 6) | 192;
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}
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else {
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ba[--n] = (c & 63) | 128;
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ba[--n] = ((c >> 6) & 63) | 128;
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ba[--n] = (c >> 12) | 224;
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}
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}
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ba[--n] = 0;
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var rng = new SecureRandom();
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var x = new Array();
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while(n > 2) { // random non-zero pad
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x[0] = 0;
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while(x[0] == 0) rng.nextBytes(x);
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ba[--n] = x[0];
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}
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ba[--n] = 2;
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ba[--n] = 0;
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return new BigInteger(ba);
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}
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// "empty" RSA key constructor
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function RSAKey() {
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this.n = null;
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this.e = 0;
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this.d = null;
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this.p = null;
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this.q = null;
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this.dmp1 = null;
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this.dmq1 = null;
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this.coeff = null;
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}
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// Set the public key fields N and e from hex strings
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function RSASetPublic(N,E) {
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if(N != null && E != null && N.length > 0 && E.length > 0) {
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this.n = parseBigInt(N,16);
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this.e = parseInt(E,16);
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}
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else
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alert("Invalid RSA public key");
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}
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// Perform raw public operation on "x": return x^e (mod n)
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function RSADoPublic(x) {
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return x.modPowInt(this.e, this.n);
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}
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// Return the PKCS#1 RSA encryption of "text" as an even-length hex string
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function RSAEncrypt(text) {
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var m = pkcs1pad2(text,(this.n.bitLength()+7)>>3);
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if(m == null) return null;
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var c = this.doPublic(m);
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if(c == null) return null;
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var h = c.toString(16);
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if((h.length & 1) == 0) return h; else return "0" + h;
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}
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// Return the PKCS#1 RSA encryption of "text" as a Base64-encoded string
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//function RSAEncryptB64(text) {
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// var h = this.encrypt(text);
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// if(h) return hex2b64(h); else return null;
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//}
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// protected
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RSAKey.prototype.doPublic = RSADoPublic;
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// public
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RSAKey.prototype.setPublic = RSASetPublic;
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RSAKey.prototype.encrypt = RSAEncrypt;
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//RSAKey.prototype.encrypt_b64 = RSAEncryptB64;
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