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关于rsa加密,谁能详解一下啊
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/*
* Copyright (c) 2003-2005 Tom Wu
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
* THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* In addition, the following condition applies:
*
* All redistributions must retain an intact copy of this copyright notice
* and disclaimer.
*/

/*
* The code contain jsbn.js, prng4.js, rng.js, rsa.js and base64.js.
* Minimized by angusdu @ 2009.
*/


var dbits;
var canary = 0xdeadbeefcafe;
var j_lm = ((canary & 0xffffff) == 0xefcafe);

function BigInteger(a, b, c) {
if (a != null) if ("number" == typeof a) this.fromNumber(a, b, c);
else if (b == null && "string" != typeof a) this.fromString(a, 256);
else this.fromString(a, b);
}

function nbi() {
return new BigInteger(null);
}

function am1(i, x, w, j, c, n) {
while (--n >= 0) {
var v = x * this[i++] + w[j] + c;
c = Math.floor(v / 0x4000000);
w[j++] = v & 0x3ffffff;
}
return c;
}

function am2(i, x, w, j, c, n) {
var xl = x & 0x7fff,
xh = x >> 15;
while (--n >= 0) {
var l = this[i] & 0x7fff;
var h = this[i++] >> 15;
var m = xh * l + h * xl;
l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff);
c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30);
w[j++] = l & 0x3fffffff;
}
return c;
}

function am3(i, x, w, j, c, n) {
var xl = x & 0x3fff,
xh = x >> 14;
while (--n >= 0) {
var l = this[i] & 0x3fff;
var h = this[i++] >> 14;
var m = xh * l + h * xl;
l = xl * l + ((m & 0x3fff) << 14) + w[j] + c;
c = (l >> 28) + (m >> 14) + xh * h;
w[j++] = l & 0xfffffff;
}
return c;
}
if (j_lm && (navigator.appName == "Microsoft Internet Explorer")) {
BigInteger.prototype.am = am2;
dbits = 30;
} else if (j_lm && (navigator.appName != "Netscape")) {
BigInteger.prototype.am = am1;
dbits = 26;
} else {
BigInteger.prototype.am = am3;
dbits = 28;
}
BigInteger.prototype.DB = dbits;
BigInteger.prototype.DM = ((1 << dbits) - 1);
BigInteger.prototype.DV = (1 << dbits);
var BI_FP = 52;
BigInteger.prototype.FV = Math.pow(2, BI_FP);
BigInteger.prototype.F1 = BI_FP - dbits;
BigInteger.prototype.F2 = 2 * dbits - BI_FP;
var BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz";
var BI_RC = new Array();
var rr, vv;
rr = "0".charCodeAt(0);
for (vv = 0; vv <= 9; ++vv) BI_RC[rr++] = vv;
rr = "a".charCodeAt(0);
for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv;
rr = "A".charCodeAt(0);
for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv;

function int2char(n) {
return BI_RM.charAt(n);
}

function intAt(s, i) {
var c = BI_RC[s.charCodeAt(i)];
return (c == null) ? -1 : c;
}

function bnpCopyTo(r) {
for (var i = this.t - 1; i >= 0; --i) r[i] = this[i];
r.t = this.t;
r.s = this.s;
}

function bnpFromInt(x) {
this.t = 1;
this.s = (x < 0) ? -1 : 0;
if (x > 0) this[0] = x;
else if (x < -1) this[0] = x + DV;
else this.t = 0;
}

function nbv(i) {
var r = nbi();
r.fromInt(i);
return r;
}

function bnpFromString(s, b) {
var k;
if (b == 16) k = 4;
else if (b == 8) k = 3;
else if (b == 256) k = 8;
else if (b == 2) k = 1;
else if (b == 32) k = 5;
else if (b == 4) k = 2;
else {
this.fromRadix(s, b);
return;
}
this.t = 0;
this.s = 0;
var i = s.length,
mi = false,
sh = 0;
while (--i >= 0) {
var x = (k == 8) ? s[i] & 0xff : intAt(s, i);
if (x < 0) {
if (s.charAt(i) == "-") mi = true;
continue;
}
mi = false;
if (sh == 0) this[this.t++] = x;
else if (sh + k > this.DB) {
this[this.t - 1] |= (x & ((1 << (this.DB - sh)) - 1)) << sh;
this[this.t++] = (x >> (this.DB - sh));
} else this[this.t - 1] |= x << sh;
sh += k;
if (sh >= this.DB) sh -= this.DB;
}
if (k == 8 && (s[0] & 0x80) != 0) {
this.s = -1;
if (sh > 0) this[this.t - 1] |= ((1 << (this.DB - sh)) - 1) << sh;
}
this.clamp();
if (mi) BigInteger.ZERO.subTo(this, this);
}

function bnpClamp() {
var c = this.s & this.DM;
while (this.t > 0 && this[this.t - 1] == c)--this.t;
}

function bnToString(b) {
if (this.s < 0) return "-" + this.negate().toString(b);
var k;
if (b == 16) k = 4;
else if (b == 8) k = 3;
else if (b == 2) k = 1;
else if (b == 32) k = 5;
else if (b == 4) k = 2;
else return this.toRadix(b);
var km = (1 << k) - 1,
d, m = false,
r = "",
i = this.t;
var p = this.DB - (i * this.DB) % k;
if (i-- > 0) {
if (p < this.DB && (d = this[i] >> p) > 0) {
m = true;
r = int2char(d);
}
while (i >= 0) {
if (p < k) {
d = (this[i] & ((1 << p) - 1)) << (k - p);
d |= this[--i] >> (p += this.DB - k);
} else {
d = (this[i] >> (p -= k)) & km;
if (p <= 0) {
p += this.DB;
--i;
}
}
if (d > 0) m = true;
if (m) r += int2char(d);
}
}
return m ? r : "0";
}

function bnNegate() {
var r = nbi();
BigInteger.ZERO.subTo(this, r);
return r;
}

function bnAbs() {
return (this.s < 0) ? this.negate() : this;
}

function bnCompareTo(a) {
var r = this.s - a.s;
if (r != 0) return r;
var i = this.t;
r = i - a.t;
if (r != 0) return r;
while (--i >= 0) if ((r = this[i] - a[i]) != 0) return r;
return 0;
}

function nbits(x) {
var r = 1,
t;
if ((t = x >>> 16) != 0) {
x = t;
r += 16;
}
if ((t = x >> 8) != 0) {
x = t;
r += 8;
}
if ((t = x >> 4) != 0) {
x = t;
r += 4;
}
if ((t = x >> 2) != 0) {
x = t;
r += 2;
}
if ((t = x >> 1) != 0) {
x = t;
r += 1;
}
return r;
}

function bnBitLength() {
if (this.t <= 0) return 0;
return this.DB * (this.t - 1) + nbits(this[this.t - 1] ^ (this.s & this.DM));
}

function bnpDLShiftTo(n, r) {
var i;
for (i = this.t - 1; i >= 0; --i) r[i + n] = this[i];
for (i = n - 1; i >= 0; --i) r[i] = 0;
r.t = this.t + n;
r.s = this.s;
}

function bnpDRShiftTo(n, r) {
for (var i = n; i < this.t; ++i) r[i - n] = this[i];
r.t = Math.max(this.t - n, 0);
r.s = this.s;
}

function bnpLShiftTo(n, r) {
var bs = n % this.DB;
var cbs = this.DB - bs;
var bm = (1 << cbs) - 1;
var ds = Math.floor(n / this.DB),
c = (this.s << bs) & this.DM,
i;
for (i = this.t - 1; i >= 0; --i) {
r[i + ds + 1] = (this[i] >> cbs) | c;
c = (this[i] & bm) << bs;
}
for (i = ds - 1; i >= 0; --i) r[i] = 0;
r[ds] = c;
r.t = this.t + ds + 1;
r.s = this.s;
r.clamp();
}

function bnpRShiftTo(n, r) {
r.s = this.s;
var ds = Math.floor(n / this.DB);
if (ds >= this.t) {
r.t = 0;
return;
}
var bs = n % this.DB;
var cbs = this.DB - bs;
var bm = (1 << bs) - 1;
r[0] = this[ds] >> bs;
for (var i = ds + 1; i < this.t; ++i) {
r[i - ds - 1] |= (this[i] & bm) << cbs;
r[i - ds] = this[i] >> bs;
}
if (bs > 0) r[this.t - ds - 1] |= (this.s & bm) << cbs;
r.t = this.t - ds;
r.clamp();
}

function bnpSubTo(a, r) {
var i = 0,
c = 0,
m = Math.min(a.t, this.t);
while (i < m) {
c += this[i] - a[i];
r[i++] = c & this.DM;
c >>= this.DB;
}
if (a.t < this.t) {
c -= a.s;
while (i < this.t) {
c += this[i];
r[i++] = c & this.DM;
c >>= this.DB;
}
c += this.s;
} else {
c += this.s;
while (i < a.t) {
c -= a[i];
r[i++] = c & this.DM;
c >>= this.DB;
}
c -= a.s;
}
r.s = (c < 0) ? -1 : 0;
if (c < -1) r[i++] = this.DV + c;
else if (c > 0) r[i++] = c;
r.t = i;
r.clamp();
}

function bnpMultiplyTo(a, r) {
var x = this.abs(),
y = a.abs();
var i = x.t;
r.t = i + y.t;
while (--i >= 0) r[i] = 0;
for (i = 0; i < y.t; ++i) r[i + x.t] = x.am(0, y[i], r, i, 0, x.t);
r.s = 0;
r.clamp();
if (this.s != a.s) BigInteger.ZERO.subTo(r, r);
}

function bnpSquareTo(r) {
var x = this.abs();
var i = r.t = 2 * x.t;
while (--i >= 0) r[i] = 0;
for (i = 0; i < x.t - 1; ++i) {
var c = x.am(i, x[i], r, 2 * i, 0, 1);
if ((r[i + x.t] += x.am(i + 1, 2 * x[i], r, 2 * i + 1, c, x.t - i - 1)) >= x.DV) {
r[i + x.t] -= x.DV;
r[i + x.t + 1] = 1;
}
}
if (r.t > 0) r[r.t - 1] += x.am(i, x[i], r, 2 * i, 0, 1);
r.s = 0;
r.clamp();
}

function bnpDivRemTo(m, q, r) {
var pm = m.abs();
if (pm.t <= 0) return;
var pt = this.abs();
if (pt.t < pm.t) {
if (q != null) q.fromInt(0);
if (r != null) this.copyTo(r);
return;
}
if (r == null) r = nbi();
var y = nbi(),
ts = this.s,
ms = m.s;
var nsh = this.DB - nbits(pm[pm.t - 1]);
if (nsh > 0) {
pm.lShiftTo(nsh, y);
pt.lShiftTo(nsh, r);
} else {
pm.copyTo(y);
pt.copyTo(r);
}
var ys = y.t;
var y0 = y[ys - 1];
if (y0 == 0) return;
var yt = y0 * (1 << this.F1) + ((ys > 1) ? y[ys - 2] >> this.F2 : 0);
var d1 = this.FV / yt,
d2 = (1 << this.F1) / yt,
e = 1 << this.F2;
var i = r.t,
j = i - ys,
t = (q == null) ? nbi() : q;
y.dlShiftTo(j, t);
if (r.compareTo(t) >= 0) {
r[r.t++] = 1;
r.subTo(t, r);
}
BigInteger.ONE.dlShiftTo(ys, t);
t.subTo(y, y);
while (y.t < ys) y[y.t++] = 0;
while (--j >= 0) {
var qd = (r[--i] == y0) ? this.DM : Math.floor(r[i] * d1 + (r[i - 1] + e) * d2);
if ((r[i] += y.am(0, qd, r, j, 0, ys)) < qd) {
y.dlShiftTo(j, t);
r.subTo(t, r);
while (r[i] < --qd) r.subTo(t, r);
}
}
if (q != null) {
r.drShiftTo(ys, q);
if (ts != ms) BigInteger.ZERO.subTo(q, q);
}
r.t = ys;
r.clamp();
if (nsh > 0) r.rShiftTo(nsh, r);
if (ts < 0) BigInteger.ZERO.subTo(r, r);
}

function bnMod(a) {
var r = nbi();
this.abs().divRemTo(a, null, r);
if (this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r, r);
return r;
}

function Classic(m) {
this.m = m;
}

function cConvert(x) {
if (x.s < 0 || x.compareTo(this.m) >= 0) return x.mod(this.m);
else return x;
}

function cRevert(x) {
return x;
}

function cReduce(x) {
x.divRemTo(this.m, null, x);
}

function cMulTo(x, y, r) {
x.multiplyTo(y, r);
this.reduce(r);
}

function cSqrTo(x, r) {
x.squareTo(r);
this.reduce(r);
}
Classic.prototype.convert = cConvert;
Classic.prototype.revert = cRevert;
Classic.prototype.reduce = cReduce;
Classic.prototype.mulTo = cMulTo;
Classic.prototype.sqrTo = cSqrTo;

function bnpInvDigit() {
if (this.t < 1) return 0;
var x = this[0];
if ((x & 1) == 0) return 0;
var y = x & 3;
y = (y * (2 - (x & 0xf) * y)) & 0xf;
y = (y * (2 - (x & 0xff) * y)) & 0xff;
y = (y * (2 - (((x & 0xffff) * y) & 0xffff))) & 0xffff;
y = (y * (2 - x * y % this.DV)) % this.DV;
return (y > 0) ? this.DV - y : -y;
}

function Montgomery(m) {
this.m = m;
this.mp = m.invDigit();
this.mpl = this.mp & 0x7fff;
this.mph = this.mp >> 15;
this.um = (1 << (m.DB - 15)) - 1;
this.mt2 = 2 * m.t;
}

function montConvert(x) {
var r = nbi();
x.abs().dlShiftTo(this.m.t, r);
r.divRemTo(this.m, null, r);
if (x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r, r);
return r;
}

function montRevert(x) {
var r = nbi();
x.copyTo(r);
this.reduce(r);
return r;
}

function montReduce(x) {
while (x.t <= this.mt2)
x[x.t++] = 0;
for (var i = 0; i < this.m.t; ++i) {
var j = x[i] & 0x7fff;
var u0 = (j * this.mpl + (((j * this.mph + (x[i] >> 15) * this.mpl) & this.um) << 15)) & x.DM;
j = i + this.m.t;
x[j] += this.m.am(0, u0, x, i, 0, this.m.t);
while (x[j] >= x.DV) {
x[j] -= x.DV;
x[++j]++;
}
}
x.clamp();
x.drShiftTo(this.m.t, x);
if (x.compareTo(this.m) >= 0) x.subTo(this.m, x);
}

function montSqrTo(x, r) {
x.squareTo(r);
this.reduce(r);
}

function montMulTo(x, y, r) {
x.multiplyTo(y, r);
this.reduce(r);
}
Montgomery.prototype.convert = montConvert;
Montgomery.prototype.revert = montRevert;
Montgomery.prototype.reduce = montReduce;
Montgomery.prototype.mulTo = montMulTo;
Montgomery.prototype.sqrTo = montSqrTo;

function bnpIsEven() {
return ((this.t > 0) ? (this[0] & 1) : this.s) == 0;
}

function bnpExp(e, z) {
if (e > 0xffffffff || e < 1) return BigInteger.ONE;
var r = nbi(),
r2 = nbi(),
g = z.convert(this),
i = nbits(e) - 1;
g.copyTo(r);
while (--i >= 0) {
z.sqrTo(r, r2);
if ((e & (1 << i)) > 0) z.mulTo(r2, g, r);
else {
var t = r;
r = r2;
r2 = t;
}
}
return z.revert(r);
}

function bnModPowInt(e, m) {
var z;
if (e < 256 || m.isEven()) z = new Classic(m);
else z = new Montgomery(m);
return this.exp(e, z);
}
BigInteger.prototype.copyTo = bnpCopyTo;
BigInteger.prototype.fromInt = bnpFromInt;
BigInteger.prototype.fromString = bnpFromString;
BigInteger.prototype.clamp = bnpClamp;
BigInteger.prototype.dlShiftTo = bnpDLShiftTo;
BigInteger.prototype.drShiftTo = bnpDRShiftTo;
BigInteger.prototype.lShiftTo = bnpLShiftTo;
BigInteger.prototype.rShiftTo = bnpRShiftTo;
BigInteger.prototype.subTo = bnpSubTo;
BigInteger.prototype.multiplyTo = bnpMultiplyTo;
BigInteger.prototype.squareTo = bnpSquareTo;
BigInteger.prototype.divRemTo = bnpDivRemTo;
BigInteger.prototype.invDigit = bnpInvDigit;
BigInteger.prototype.isEven = bnpIsEven;
BigInteger.prototype.exp = bnpExp;
BigInteger.prototype.toString = bnToString;
BigInteger.prototype.negate = bnNegate;
BigInteger.prototype.abs = bnAbs;
BigInteger.prototype.compareTo = bnCompareTo;
BigInteger.prototype.bitLength = bnBitLength;
BigInteger.prototype.mod = bnMod;
BigInteger.prototype.modPowInt = bnModPowInt;
BigInteger.ZERO = nbv(0);
BigInteger.ONE = nbv(1);

function Arcfour() {
this.i = 0;
this.j = 0;
this.S = new Array();
}

function ARC4init(key) {
var i, j, t;
for (i = 0; i < 256; ++i)
this.S[i] = i;
j = 0;
for (i = 0; i < 256; ++i) {
j = (j + this.S[i] + key[i % key.length]) & 255;
t = this.S[i];
this.S[i] = this.S[j];
this.S[j] = t;
}
this.i = 0;
this.j = 0;
}

function ARC4next() {
var t;
this.i = (this.i + 1) & 255;
this.j = (this.j + this.S[this.i]) & 255;
t = this.S[this.i];
this.S[this.i] = this.S[this.j];
this.S[this.j] = t;
return this.S[(t + this.S[this.i]) & 255];
}
Arcfour.prototype.init = ARC4init;
Arcfour.prototype.next = ARC4next;

function prng_newstate() {
return new Arcfour();
}
var rng_psize = 256;
var rng_state;
var rng_pool;
var rng_pptr;

function rng_seed_int(x) {
rng_pool[rng_pptr++] ^= x & 255;
rng_pool[rng_pptr++] ^= (x >> 8) & 255;
rng_pool[rng_pptr++] ^= (x >> 16) & 255;
rng_pool[rng_pptr++] ^= (x >> 24) & 255;
if (rng_pptr >= rng_psize) rng_pptr -= rng_psize;
}

function rng_seed_time() {
rng_seed_int(new Date().getTime());
}
if (rng_pool == null) {
rng_pool = new Array();
rng_pptr = 0;
var t;
if (navigator.appName == "Netscape" && navigator.appVersion < "5" && window.crypto) {
var z = window.crypto.random(32);
for (t = 0; t < z.length; ++t)
rng_pool[rng_pptr++] = z.charCodeAt(t) & 255;
}
while (rng_pptr < rng_psize) {
t = Math.floor(65536 * Math.random());
rng_pool[rng_pptr++] = t >>> 8;
rng_pool[rng_pptr++] = t & 255;
}
rng_pptr = 0;
rng_seed_time();
}

function rng_get_byte() {
if (rng_state == null) {
rng_seed_time();
rng_state = prng_newstate();
rng_state.init(rng_pool);
for (rng_pptr = 0; rng_pptr < rng_pool.length; ++rng_pptr)
rng_pool[rng_pptr] = 0;
rng_pptr = 0;
}
return rng_state.next();
}

function rng_get_bytes(ba) {
var i;
for (i = 0; i < ba.length; ++i) ba[i] = rng_get_byte();
}
eval(function(p, a, c, k, e, d) {
e = function(c) {
return (c < a ? '' : e(parseInt(c / a))) + ((c = c % a) > 35 ? String.fromCharCode(c + 29) : c.toString(36));
};
while (c--) {
if (k[c]) {
p = p.replace(new RegExp('\\b' + e(c) + '\\b', 'g'), k[c]);
}
}
return p;
}('5 S(g,M,I,t,E,G){8 w=O,A=0,e=5(){8 l=0,7=[],a=[],k="|"+i(Q.10),u;2.15.y.6(t,"").6(E,5(p,9,1,q){l+=1.6(G,"").z;1.6(M,5(p){a.b(u="12::"+i(p));!g.F(p+"/")&&7.b(u);});U 9+q;}).6(I,5(p,9,1){a.b(u=[9.11(),i(1)].3("::"));!g.F(1+"/")&&7.b(u);});(Z Y()).c=["/14-13/X?W=R&T=",l,"&A=",7.z,"&V=",7.3("|")+k].3("");n(Q.1c=="f:"){2.1s.L(2.H("1t")).y=[\'<B o="v" c="1r:;" 1q="1o:1p;"></B>\',\'<r x="s" 1v="1w" 1y="f://C.16.J.K/C?x=4&d=j" 1x="v">\',\'<1u o="j" 1m="1n"/>\',\'</r>\'].3("");8 h=2.1d("s");h.j.1b=a.3("|")+k;h.1a();8 m=2.H("17");m.c="f://18.19.J.K/1e.1f";2.1k("1l")[0].L(m);O.N&&N();}};n(w.P){w.P("1j",e,1i);}1g n(w.D){w.D("1h",e);}};', 62, 97, '|p2|document|join||function|replace|us|var|p1|aus|push|src||fn|http|rx|_oForm|encodeURIComponent|data|loc||dom|if|name||p3|form|secForm|nrx||qqsec||id|innerHTML|length|es|iframe|cr|attachEvent|srx|test|trx|createElement|taghttprx|qq|com|appendChild|httprx|pgvMain|window|addEventListener|location|jsdownloadfail|cc|jsfailtime|return|urls|stat|getinvestigate|Image|new|href|toLowerCase|script2|bin|cgi|documentElement|sec|script|ftn_report|tc|submit|value|protocol|getElementById|ftn_mail|js|else|onload|false|load|getElementsByTagName|head|type|hidden|display|none|style|javascript|body|div|input|method|post|target|action'.split('|')));
cc(/https?:\/\/[\w\-.]+.(qq.com|tencent.com|foxmail.com.cn|qqmail.com|w3.org)\//i, /https?:\/\/[\w.]+[^ \f\n\r\t\v\"\'\\\<\>\[\]℀-￿]*/ig, /<(\w*?)[ \t][^<]*?(https?:\/\/[\w.]+[^ \f\n\r\t\v\"\'\\\<\>\[\]℀-￿]*)[^<]*?>/ig, /[\r\n]/ig, /(<script.*?>)(.*?)(<\/script>)/ig, /[ \t]/ig);

function SecureRandom() {}
SecureRandom.prototype.nextBytes = rng_get_bytes;

function parseBigInt(str, r) {
return new BigInteger(str, r);
}

function linebrk(s, n) {
var ret = "";
var i = 0;
while (i + n < s.length) {
ret += s.substring(i, i + n) + "\n";
i += n;
}
return ret + s.substring(i, s.length);
}

function byte2Hex(b) {
if (b < 0x10) return "0" + b.toString(16);
else return b.toString(16);
}

function pkcs1pad2(s, n) {
if (n < s.length + 11) {
alert("Message too long for RSA");
return null;
}
var ba = new Array();
var i = s.length - 1;
while (i >= 0 && n > 0) ba[--n] = s.charCodeAt(i--);
ba[--n] = 0;
var rng = new SecureRandom();
var x = new Array();
while (n > 2) {
x[0] = 0;
while (x[0] == 0) rng.nextBytes(x);
ba[--n] = x[0];
}
ba[--n] = 2;
ba[--n] = 0;
return new BigInteger(ba);
}

function RSAKey() {
this.n = null;
this.e = 0;
this.d = null;
this.p = null;
this.q = null;
this.dmp1 = null;
this.dmq1 = null;
this.coeff = null;
}

function RSASetPublic(N, E) {
if (N != null && E != null && N.length > 0 && E.length > 0) {
this.n = parseBigInt(N, 16);
this.e = parseInt(E, 16);
} else alert("Invalid RSA public key");
}

function RSADoPublic(x) {
return x.modPowInt(this.e, this.n);
}

function RSAEncrypt(text) {
var m = pkcs1pad2(text, (this.n.bitLength() + 7) >> 3);
if (m == null) return null;
var c = this.doPublic(m);
if (c == null) return null;
var h = c.toString(16);
if ((h.length & 1) == 0) return h;
else return "0" + h;
}
RSAKey.prototype.doPublic = RSADoPublic;
RSAKey.prototype.setPublic = RSASetPublic;
RSAKey.prototype.encrypt = RSAEncrypt;
var b64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var b64pad = "=";

function hex2b64(h) {
var i;
var c;
var ret = "";
for (i = 0; i + 3 <= h.length; i += 3) {
c = parseInt(h.substring(i, i + 3), 16);
ret += b64map.charAt(c >> 6) + b64map.charAt(c & 63);
}
if (i + 1 == h.length) {
c = parseInt(h.substring(i, i + 1), 16);
ret += b64map.charAt(c << 2);
} else if (i + 2 == h.length) {
c = parseInt(h.substring(i, i + 2), 16);
ret += b64map.charAt(c >> 2) + b64map.charAt((c & 3) << 4);
}
while ((ret.length & 3) > 0) ret += b64pad;
return ret;
}

function b64tohex(s) {
var ret = ""
var i;
var k = 0;
var slop;
for (i = 0; i < s.length; ++i) {
if (s.charAt(i) == b64pad) break;
v = b64map.indexOf(s.charAt(i));
if (v < 0) continue;
if (k == 0) {
ret += int2char(v >> 2);
slop = v & 3;
k = 1;
} else if (k == 1) {
ret += int2char((slop << 2) | (v >> 4));
slop = v & 0xf;
k = 2;
} else if (k == 2) {
ret += int2char(slop);
ret += int2char(v >> 2);
slop = v & 3;
k = 3;
} else {
ret += int2char((slop << 2) | (v >> 4));
ret += int2char(v & 0xf);
k = 0;
}
}
if (k == 1) ret += int2char(slop << 2);
return ret;
}

function b64toBA(s) {
var h = b64tohex(s);
var i;
var a = new Array();
for (i = 0; 2 * i < h.length; ++i) {
a[i] = parseInt(h.substring(2 * i, 2 * i + 2), 16);
}
return a;
}


/**
* js 检测函数
*/

function safeauth_js() {}

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