为了避免用户密码使用明文传输，在传输前需要进行加密处理，服务端接收之后再进行解密，这样从一定程度上保护了密码安全。
基本过程如下：
显然，采用非对称加密更合适，这里我们使用RSA加密算法。
需要三方面的东东。
第一样，服务器端RSA加解密工具类及KEY定义。
第二样，Web端RSA加密工具类，支持根据公钥加密。
第三样，用户登录时的处理脚本。
赋代码是直接的
Case one
1 namespace Tool.Security 2 { 3 /// <summary> 4 /// 对公钥的提供和对解密的支持 5 /// </summary> 6 static class RSAHelper 7 { 8 private static string ByteToHex(byte[] byteArray) 9 { 10 string outString = ""; 11 foreach (Byte b in byteArray) 12 { 13 outString += b.ToString("X2"); 14 } 15 return outString; 16 } 17 18 private static byte[] HexToByte(string hexString) 19 { 20 byte[] returnBytes = new byte[hexString.Length / 2]; 21 for (int i = 0; i < returnBytes.Length; i++) 22 { 23 returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16); 24 } 25 return returnBytes; 26 } 27 28 private static RSACryptoServiceProvider GetRSA() 29 { 30 CspParameters _cpsParameter = new CspParameters(); 31 _cpsParameter.Flags = CspProviderFlags.UseMachineKeyStore; 32 33 RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024, _cpsParameter); 34 35 var keyString = @"<RSAKeyValue><Modulus>ucNbt0w1Epc/Cs7sgUIvz5GH/s6qe5REAQUrAwo3yFZ/ZElY11urTAQ/CctHppJ8dCplxM5yjHUG+XGlYM700IIYPQaylUKNIRUzdP/Ov3wMfakfHFeItwmNhbVDjicfMPlrnQtwv4hlxMMIfDAKD7TbuwzNyLrmACKGfnXclOM=</Modulus><Exponent>AQAB</Exponent><P>+hh9uGmx99hDlYMm9X6s4oxWomKFgIFDWw1gTigL1A21yEF0t0lyd1ehIUvJMg9H1UxOQnLMIXViMjrRajXT8w==</P><Q>viYPHwxXIUCvzq/SU6CcOnizyXpOR+yL6GrYrbxFCVxvlCdI59P9yXeObVWEbLhp4N+tpMNW4nnLtTgU/WunUQ==</Q><DP>LXYQPFpyMFROjLoHde6t7IyIHwJ7tA1LOhznWa2r4MMRPTKwzbR7KzhxoMTO8NuYOiyhuTB27MoSrIDGmmDogw==</DP><DQ>HGVcnrteC6Y4Wvpgw4JZslWyK6VrKUyG/DdwkklqWeKG+y3+sjgzTzHegC9kLkQ/84gTy2YshHfB1xc/8zRvcQ==</DQ><InverseQ>s4UFcRxlke8UZC5wMpaPgBGUR4DjauLdLtPZV/KFaFjquwAS/Mf1Oguz66afLG6AFUsmevuITyT7/Dq9DnurPg==</InverseQ><D>s4EtAm34pxNSDv6vmaQ8kSZ/NOG96hb2s8mrq49XIhc7mMwrtkdVuuorhCpT/Yl2C8bgepJILKP1blu8RFUYSS7SVab/qi1wn6p33hRFb2waxef/QiBPDoLiGDbU6mNsOGGr4fxKcMSrpVhzEJO7fxrZ9yq7ZJ3t2m7N21R9FaE=</D></RSAKeyValue>"; 36 rsa.FromXmlString(keyString); 37 return rsa; 38 } 39 40 public static Publickey GetPublickey() 41 { 42 Publickey publickey = new Publickey(); 43 RSACryptoServiceProvider rsa = GetRSA(); 44 RSAParameters rp = rsa.ExportParameters(false); 45 publickey.Exponent = ByteToHex(rp.Exponent); 46 publickey.Modulus = ByteToHex(rp.Modulus); 47 return publickey; 48 } 49 50 public static string Decrypt(string s) 51 { 52 RSACryptoServiceProvider rsa = GetRSA(); 53 return Encoding.Default.GetString(rsa.Decrypt(HexToByte(s), false)); 54 } 55 } 56 57 class RSAKey 58 { 59 public string XmlString { get; set; } 60 } 61 62 class Publickey 63 { 64 public string Modulus { get; set; } 65 public string Exponent { get; set; } 66 } 67 }
Case Two
1 var dbits; 2 var canary = 0xdeadbeefcafe; 3 var j_lm = ((canary & 0xffffff) == 0xefcafe); 4 function BigInteger(a, b, c) { 5 if (a != null) 6 if ("number" == typeof a) this.fromNumber(a, b, c); 7 else if (b == null && "string" != typeof a) this.fromString(a, 256); 8 else this.fromString(a, b); 9 } 10 function nbi() { return new BigInteger(null); } 11 function am1(i, x, w, j, c, n) { 12 while (--n >= 0) { 13 var v = x * this[i++] + w[j] + c; 14 c = Math.floor(v / 0x4000000); 15 w[j++] = v & 0x3ffffff; 16 } 17 return c; 18 } 19 function am2(i, x, w, j, c, n) { 20 var xl = x & 0x7fff, xh = x >> 15; 21 while (--n >= 0) { 22 var l = this[i] & 0x7fff; 23 var h = this[i++] >> 15; 24 var m = xh * l + h * xl; 25 l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff); 26 c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30); 27 w[j++] = l & 0x3fffffff; 28 } 29 return c; 30 } 31 function am3(i, x, w, j, c, n) { 32 var xl = x & 0x3fff, xh = x >> 14; 33 while (--n >= 0) { 34 var l = this[i] & 0x3fff; 35 var h = this[i++] >> 14; 36 var m = xh * l + h * xl; 37 l = xl * l + ((m & 0x3fff) << 14) + w[j] + c; 38 c = (l >> 28) + (m >> 14) + xh * h; 39 w[j++] = l & 0xfffffff; 40 } 41 return c; 42 } 43 if (j_lm && (navigator.appName == "Microsoft Internet Explorer")) { 44 BigInteger.prototype.am = am2; 45 dbits = 30; 46 } 47 else if (j_lm && (navigator.appName != "Netscape")) { 48 BigInteger.prototype.am = am1; 49 dbits = 26; 50 } 51 else { 52 BigInteger.prototype.am = am3; 53 dbits = 28; 54 } 55 BigInteger.prototype.DB = dbits; 56 BigInteger.prototype.DM = ((1 << dbits) - 1); 57 BigInteger.prototype.DV = (1 << dbits); 58 var BI_FP = 52; 59 BigInteger.prototype.FV = Math.pow(2, BI_FP); 60 BigInteger.prototype.F1 = BI_FP - dbits; 61 BigInteger.prototype.F2 = 2 * dbits - BI_FP; 62 var BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz"; 63 var BI_RC = new Array(); 64 var rr, vv; 65 rr = "0".charCodeAt(0); 66 for (vv = 0; vv <= 9; ++vv) BI_RC[rr++] = vv; 67 rr = "a".charCodeAt(0); 68 for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv; 69 rr = "A".charCodeAt(0); 70 for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv; 71 function int2char(n) { return BI_RM.charAt(n); } 72 function intAt(s, i) { 73 var c = BI_RC[s.charCodeAt(i)]; 74 return (c == null) ? -1 : c; 75 } 76 function bnpCopyTo(r) { 77 for (var i = this.t - 1; i >= 0; --i) r[i] = this[i]; 78 r.t = this.t; 79 r.s = this.s; 80 } 81 function bnpFromInt(x) { 82 this.t = 1; 83 this.s = (x < 0) ? -1 : 0; 84 if (x > 0) this[0] = x; 85 else if (x < -1) this[0] = x + DV; 86 else this.t = 0; 87 } 88 function nbv(i) { var r = nbi(); r.fromInt(i); return r; } 89 function bnpFromString(s, b) { 90 var k; 91 if (b == 16) k = 4; 92 else if (b == 8) k = 3; 93 else if (b == 256) k = 8; 94 else if (b == 2) k = 1; 95 else if (b == 32) k = 5; 96 else if (b == 4) k = 2; 97 else { this.fromRadix(s, b); return; } 98 this.t = 0; 99 this.s = 0; 100 var i = s.length, mi = false, sh = 0; 101 while (--i >= 0) { 102 var x = (k == 8) ? s[i] & 0xff : intAt(s, i); 103 if (x < 0) { 104 if (s.charAt(i) == "-") mi = true; 105 continue; 106 } 107 mi = false; 108 if (sh == 0) 109 this[this.t++] = x; 110 else if (sh + k > this.DB) { 111 this[this.t - 1] |= (x & ((1 << (this.DB - sh)) - 1)) << sh; 112 this[this.t++] = (x >> (this.DB - sh)); 113 } 114 else 115 this[this.t - 1] |= x << sh; 116 sh += k; 117 if (sh >= this.DB) sh -= this.DB; 118 } 119 if (k == 8 && (s[0] & 0x80) != 0) { 120 this.s = -1; 121 if (sh > 0) this[this.t - 1] |= ((1 << (this.DB - sh)) - 1) << sh; 122 } 123 this.clamp(); 124 if (mi) BigInteger.ZERO.subTo(this, this); 125 } 126 function bnpClamp() { 127 var c = this.s & this.DM; 128 while (this.t > 0 && this[this.t - 1] == c) --this.t; 129 } 130 function bnToString(b) { 131 if (this.s < 0) return "-" + this.negate().toString(b); 132 var k; 133 if (b == 16) k = 4; 134 else if (b == 8) k = 3; 135 else if (b == 2) k = 1; 136 else if (b == 32) k = 5; 137 else if (b == 4) k = 2; 138 else return this.toRadix(b); 139 var km = (1 << k) - 1, d, m = false, r = "", i = this.t; 140 var p = this.DB - (i * this.DB) % k; 141 if (i-- > 0) { 142 if (p < this.DB && (d = this[i] >> p) > 0) { m = true; r = int2char(d); } 143 while (i >= 0) { 144 if (p < k) { 145 d = (this[i] & ((1 << p) - 1)) << (k - p); 146 d |= this[--i] >> (p += this.DB - k); 147 } 148 else { 149 d = (this[i] >> (p -= k)) & km; 150 if (p <= 0) { p += this.DB; --i; } 151 } 152 if (d > 0) m = true; 153 if (m) r += int2char(d); 154 } 155 } 156 return m ? r : "0"; 157 } 158 function bnNegate() { var r = nbi(); BigInteger.ZERO.subTo(this, r); return r; } 159 function bnAbs() { return (this.s < 0) ? this.negate() : this; } 160 function bnCompareTo(a) { 161 var r = this.s - a.s; 162 if (r != 0) return r; 163 var i = this.t; 164 r = i - a.t; 165 if (r != 0) return r; 166 while (--i >= 0) if ((r = this[i] - a[i]) != 0) return r; 167 return 0; 168 } 169 function nbits(x) { 170 var r = 1, t; 171 if ((t = x >>> 16) != 0) { x = t; r += 16; } 172 if ((t = x >> 8) != 0) { x = t; r += 8; } 173 if ((t = x >> 4) != 0) { x = t; r += 4; } 174 if ((t = x >> 2) != 0) { x = t; r += 2; } 175 if ((t = x >> 1) != 0) { x = t; r += 1; } 176 return r; 177 } 178 function bnBitLength() { 179 if (this.t <= 0) return 0; 180 return this.DB * (this.t - 1) + nbits(this[this.t - 1] ^ (this.s & this.DM)); 181 } 182 function bnpDLShiftTo(n, r) { 183 var i; 184 for (i = this.t - 1; i >= 0; --i) r[i + n] = this[i]; 185 for (i = n - 1; i >= 0; --i) r[i] = 0; 186 r.t = this.t + n; 187 r.s = this.s; 188 } 189 function bnpDRShiftTo(n, r) { 190 for (var i = n; i < this.t; ++i) r[i - n] = this[i]; 191 r.t = Math.max(this.t - n, 0); 192 r.s = this.s; 193 } 194 function bnpLShiftTo(n, r) { 195 var bs = n % this.DB; 196 var cbs = this.DB - bs; 197 var bm = (1 << cbs) - 1; 198 var ds = Math.floor(n / this.DB), c = (this.s << bs) & this.DM, i; 199 for (i = this.t - 1; i >= 0; --i) { 200 r[i + ds + 1] = (this[i] >> cbs) | c; 201 c = (this[i] & bm) << bs; 202 } 203 for (i = ds - 1; i >= 0; --i) r[i] = 0; 204 r[ds] = c; 205 r.t = this.t + ds + 1; 206 r.s = this.s; 207 r.clamp(); 208 } 209 function bnpRShiftTo(n, r) { 210 r.s = this.s; 211 var ds = Math.floor(n / this.DB); 212 if (ds >= this.t) { r.t = 0; return; } 213 var bs = n % this.DB; 214 var cbs = this.DB - bs; 215 var bm = (1 << bs) - 1; 216 r[0] = this[ds] >> bs; 217 for (var i = ds + 1; i < this.t; ++i) { 218 r[i - ds - 1] |= (this[i] & bm) << cbs; 219 r[i - ds] = this[i] >> bs; 220 } 221 if (bs > 0) r[this.t - ds - 1] |= (this.s & bm) << cbs; 222 r.t = this.t - ds; 223 r.clamp(); 224 } 225 function bnpSubTo(a, r) { 226 var i = 0, c = 0, m = Math.min(a.t, this.t); 227 while (i < m) { 228 c += this[i] - a[i]; 229 r[i++] = c & this.DM; 230 c >>= this.DB; 231 } 232 if (a.t < this.t) { 233 c -= a.s; 234 while (i < this.t) { 235 c += this[i]; 236 r[i++] = c & this.DM; 237 c >>= this.DB; 238 } 239 c += this.s; 240 } 241 else { 242 c += this.s; 243 while (i < a.t) { 244 c -= a[i]; 245 r[i++] = c & this.DM; 246 c >>= this.DB; 247 } 248 c -= a.s; 249 } 250 r.s = (c < 0) ? -1 : 0; 251 if (c < -1) r[i++] = this.DV + c; 252 else if (c > 0) r[i++] = c; 253 r.t = i; 254 r.clamp(); 255 } 256 function bnpMultiplyTo(a, r) { 257 var x = this.abs(), y = a.abs(); 258 var i = x.t; 259 r.t = i + y.t; 260 while (--i >= 0) r[i] = 0; 261 for (i = 0; i < y.t; ++i) r[i + x.t] = x.am(0, y[i], r, i, 0, x.t); 262 r.s = 0; 263 r.clamp(); 264 if (this.s != a.s) BigInteger.ZERO.subTo(r, r); 265 } 266 function bnpSquareTo(r) { 267 var x = this.abs(); 268 var i = r.t = 2 * x.t; 269 while (--i >= 0) r[i] = 0; 270 for (i = 0; i < x.t - 1; ++i) { 271 var c = x.am(i, x[i], r, 2 * i, 0, 1); 272 if ((r[i + x.t] += x.am(i + 1, 2 * x[i], r, 2 * i + 1, c, x.t - i - 1)) >= x.DV) { 273 r[i + x.t] -= x.DV; 274 r[i + x.t + 1] = 1; 275 } 276 } 277 if (r.t > 0) r[r.t - 1] += x.am(i, x[i], r, 2 * i, 0, 1); 278 r.s = 0; 279 r.clamp(); 280 } 281 function bnpDivRemTo(m, q, r) { 282 var pm = m.abs(); 283 if (pm.t <= 0) return; 284 var pt = this.abs(); 285 if (pt.t < pm.t) { 286 if (q != null) q.fromInt(0); 287 if (r != null) this.copyTo(r); 288 return; 289 } 290 if (r == null) r = nbi(); 291 var y = nbi(), ts = this.s, ms = m.s; 292 var nsh = this.DB - nbits(pm[pm.t - 1]); 293 if (nsh > 0) { pm.lShiftTo(nsh, y); pt.lShiftTo(nsh, r); } 294 else { pm.copyTo(y); pt.copyTo(r); } 295 var ys = y.t; 296 var y0 = y[ys - 1]; 297 if (y0 == 0) return; 298 var yt = y0 * (1 << this.F1) + ((ys > 1) ? y[ys - 2] >> this.F2 : 0); 299 var d1 = this.FV / yt, d2 = (1 << this.F1) / yt, e = 1 << this.F2; 300 var i = r.t, j = i - ys, t = (q == null) ? nbi() : q; 301 y.dlShiftTo(j, t); 302 if (r.compareTo(t) >= 0) { 303 r[r.t++] = 1; 304 r.subTo(t, r); 305 } 306 BigInteger.ONE.dlShiftTo(ys, t); 307 t.subTo(y, y); 308 while (y.t < ys) y[y.t++] = 0; 309 while (--j >= 0) { 310 311 var qd = (r[--i] == y0) ? this.DM : Math.floor(r[i] * d1 + (r[i - 1] + e) * d2); 312 if ((r[i] += y.am(0, qd, r, j, 0, ys)) < qd) { 313 y.dlShiftTo(j, t); 314 r.subTo(t, r); 315 while (r[i] < --qd) r.subTo(t, r); 316 } 317 } 318 if (q != null) { 319 r.drShiftTo(ys, q); 320 if (ts != ms) BigInteger.ZERO.subTo(q, q); 321 } 322 r.t = ys; 323 r.clamp(); 324 if (nsh > 0) r.rShiftTo(nsh, r); 325 if (ts < 0) BigInteger.ZERO.subTo(r, r); 326 } 327 function bnMod(a) { 328 var r = nbi(); 329 this.abs().divRemTo(a, null, r); 330 if (this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r, r); 331 return r; 332 } 333 function Classic(m) { this.m = m; } 334 function cConvert(x) { 335 if (x.s < 0 || x.compareTo(this.m) >= 0) return x.mod(this.m); 336 else return x; 337 } 338 function cRevert(x) { return x; } 339 function cReduce(x) { x.divRemTo(this.m, null, x); } 340 function cMulTo(x, y, r) { x.multiplyTo(y, r); this.reduce(r); } 341 function cSqrTo(x, r) { x.squareTo(r); this.reduce(r); } 342 Classic.prototype.convert = cConvert; 343 Classic.prototype.revert = cRevert; 344 Classic.prototype.reduce = cReduce; 345 Classic.prototype.mulTo = cMulTo; 346 Classic.prototype.sqrTo = cSqrTo; 347 function bnpInvDigit() { 348 if (this.t < 1) return 0; 349 var x = this[0]; 350 if ((x & 1) == 0) return 0; 351 var y = x & 3; 352 y = (y * (2 - (x & 0xf) * y)) & 0xf; 353 y = (y * (2 - (x & 0xff) * y)) & 0xff; 354 y = (y * (2 - (((x & 0xffff) * y) & 0xffff))) & 0xffff; 355 356 357 y = (y * (2 - x * y % this.DV)) % this.DV; 358 359 return (y > 0) ? this.DV - y : -y; 360 } 361 function Montgomery(m) { 362 this.m = m; 363 this.mp = m.invDigit(); 364 this.mpl = this.mp & 0x7fff; 365 this.mph = this.mp >> 15; 366 this.um = (1 << (m.DB - 15)) - 1; 367 this.mt2 = 2 * m.t; 368 } 369 function montConvert(x) { 370 var r = nbi(); 371 x.abs().dlShiftTo(this.m.t, r); 372 r.divRemTo(this.m, null, r); 373 if (x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r, r); 374 return r; 375 } 376 function montRevert(x) { 377 var r = nbi(); 378 x.copyTo(r); 379 this.reduce(r); 380 return r; 381 } 382 function montReduce(x) { 383 while (x.t <= this.mt2) 384 x[x.t++] = 0; 385 for (var i = 0; i < this.m.t; ++i) { 386 387 var j = x[i] & 0x7fff; 388 var u0 = (j * this.mpl + (((j * this.mph + (x[i] >> 15) * this.mpl) & this.um) << 15)) & x.DM; 389 390 j = i + this.m.t; 391 x[j] += this.m.am(0, u0, x, i, 0, this.m.t); 392 393 while (x[j] >= x.DV) { x[j] -= x.DV; x[++j]++; } 394 } 395 x.clamp(); 396 x.drShiftTo(this.m.t, x); 397 if (x.compareTo(this.m) >= 0) x.subTo(this.m, x); 398 } 399 function montSqrTo(x, r) { x.squareTo(r); this.reduce(r); } 400 function montMulTo(x, y, r) { x.multiplyTo(y, r); this.reduce(r); } 401 Montgomery.prototype.convert = montConvert; 402 Montgomery.prototype.revert = montRevert; 403 Montgomery.prototype.reduce = montReduce; 404 Montgomery.prototype.mulTo = montMulTo; 405 Montgomery.prototype.sqrTo = montSqrTo; 406 function bnpIsEven() { return ((this.t > 0) ? (this[0] & 1) : this.s) == 0; } 407 function bnpExp(e, z) { 408 if (e > 0xffffffff || e < 1) return BigInteger.ONE; 409 var r = nbi(), r2 = nbi(), g = z.convert(this), i = nbits(e) - 1; 410 g.copyTo(r); 411 while (--i >= 0) { 412 z.sqrTo(r, r2); 413 if ((e & (1 << i)) > 0) z.mulTo(r2, g, r); 414 else { var t = r; r = r2; r2 = t; } 415 } 416 return z.revert(r); 417 } 418 function bnModPowInt(e, m) { 419 var z; 420 if (e < 256 || m.isEven()) z = new Classic(m); else z = new Montgomery(m); 421 return this.exp(e, z); 422 } 423 BigInteger.prototype.copyTo = bnpCopyTo; 424 BigInteger.prototype.fromInt = bnpFromInt; 425 BigInteger.prototype.fromString = bnpFromString; 426 BigInteger.prototype.clamp = bnpClamp; 427 BigInteger.prototype.dlShiftTo = bnpDLShiftTo; 428 BigInteger.prototype.drShiftTo = bnpDRShiftTo; 429 BigInteger.prototype.lShiftTo = bnpLShiftTo; 430 BigInteger.prototype.rShiftTo = bnpRShiftTo; 431 BigInteger.prototype.subTo = bnpSubTo; 432 BigInteger.prototype.multiplyTo = bnpMultiplyTo; 433 BigInteger.prototype.squareTo = bnpSquareTo; 434 BigInteger.prototype.divRemTo = bnpDivRemTo; 435 BigInteger.prototype.invDigit = bnpInvDigit; 436 BigInteger.prototype.isEven = bnpIsEven; 437 BigInteger.prototype.exp = bnpExp; 438 BigInteger.prototype.toString = bnToString; 439 BigInteger.prototype.negate = bnNegate; 440 BigInteger.prototype.abs = bnAbs; 441 BigInteger.prototype.compareTo = bnCompareTo; 442 BigInteger.prototype.bitLength = bnBitLength; 443 BigInteger.prototype.mod = bnMod; 444 BigInteger.prototype.modPowInt = bnModPowInt; 445 BigInteger.ZERO = nbv(0); 446 BigInteger.ONE = nbv(1); 447 function Arcfour() { 448 this.i = 0; 449 this.j = 0; 450 this.S = new Array(); 451 } 452 function ARC4init(key) { 453 var i, j, t; 454 for (i = 0; i < 256; ++i) 455 this.S[i] = i; 456 j = 0; 457 for (i = 0; i < 256; ++i) { 458 j = (j + this.S[i] + key[i % key.length]) & 255; 459 t = this.S[i]; 460 this.S[i] = this.S[j]; 461 this.S[j] = t; 462 } 463 this.i = 0; 464 this.j = 0; 465 } 466 function ARC4next() { 467 var t; 468 this.i = (this.i + 1) & 255; 469 this.j = (this.j + this.S[this.i]) & 255; 470 t = this.S[this.i]; 471 this.S[this.i] = this.S[this.j]; 472 this.S[this.j] = t; 473 return this.S[(t + this.S[this.i]) & 255]; 474 } 475 Arcfour.prototype.init = ARC4init; 476 Arcfour.prototype.next = ARC4next; 477 function prng_newstate() { 478 return new Arcfour(); 479 } 480 var rng_psize = 256; 481 var rng_state; 482 var rng_pool; 483 var rng_pptr; 484 function rng_seed_int(x) { 485 rng_pool[rng_pptr++] ^= x & 255; 486 rng_pool[rng_pptr++] ^= (x >> 8) & 255; 487 rng_pool[rng_pptr++] ^= (x >> 16) & 255; 488 rng_pool[rng_pptr++] ^= (x >> 24) & 255; 489 if (rng_pptr >= rng_psize) rng_pptr -= rng_psize; 490 } 491 function rng_seed_time() { 492 rng_seed_int(new Date().getTime()); 493 } 494 if (rng_pool == null) { 495 rng_pool = new Array(); 496 rng_pptr = 0; 497 var t; 498 if (navigator.appName == "Netscape" && navigator.appVersion < "5" && window.crypto) { 499 500 var z = window.crypto.random(32); 501 for (t = 0; t < z.length; ++t) 502 rng_pool[rng_pptr++] = z.charCodeAt(t) & 255; 503 } 504 while (rng_pptr < rng_psize) { 505 t = Math.floor(65536 * Math.random()); 506 rng_pool[rng_pptr++] = t >>> 8; 507 rng_pool[rng_pptr++] = t & 255; 508 } 509 rng_pptr = 0; 510 rng_seed_time(); 511 512 513 } 514 function rng_get_byte() { 515 if (rng_state == null) { 516 rng_seed_time(); 517 rng_state = prng_newstate(); 518 rng_state.init(rng_pool); 519 for (rng_pptr = 0; rng_pptr < rng_pool.length; ++rng_pptr) 520 rng_pool[rng_pptr] = 0; 521 rng_pptr = 0; 522 523 } 524 525 return rng_state.next(); 526 } 527 function rng_get_bytes(ba) { 528 var i; 529 for (i = 0; i < ba.length; ++i) ba[i] = rng_get_byte(); 530 } 531 function SecureRandom() { } 532 SecureRandom.prototype.nextBytes = rng_get_bytes; 533 function parseBigInt(str, r) { 534 return new BigInteger(str, r); 535 } 536 function linebrk(s, n) { 537 var ret = ""; 538 var i = 0; 539 while (i + n < s.length) { 540 ret += s.substring(i, i + n) + " "; 541 i += n; 542 } 543 return ret + s.substring(i, s.length); 544 } 545 function byte2Hex(b) { 546 if (b < 0x10) 547 return "0" + b.toString(16); 548 else 549 return b.toString(16); 550 } 551 function pkcs1pad2(s, n) { 552 if (n < s.length + 11) { 553 alert("Message too long for RSA"); 554 return null; 555 } 556 var ba = new Array(); 557 var i = s.length - 1; 558 while (i >= 0 && n > 0) ba[--n] = s.charCodeAt(i--); 559 ba[--n] = 0; 560 var rng = new SecureRandom(); 561 var x = new Array(); 562 while (n > 2) { 563 x[0] = 0; 564 while (x[0] == 0) rng.nextBytes(x); 565 ba[--n] = x[0]; 566 } 567 ba[--n] = 2; 568 ba[--n] = 0; 569 return new BigInteger(ba); 570 } 571 function RSAKey() { 572 this.n = null; 573 this.e = 0; 574 this.d = null; 575 this.p = null; 576 this.q = null; 577 this.dmp1 = null; 578 this.dmq1 = null; 579 this.coeff = null; 580 } 581 function RSASetPublic(N, E) { 582 if (N != null && E != null && N.length > 0 && E.length > 0) { 583 this.n = parseBigInt(N, 16); 584 this.e = parseInt(E, 16); 585 } 586 else 587 alert("Invalid RSA public key"); 588 } 589 function RSADoPublic(x) { 590 return x.modPowInt(this.e, this.n); 591 } 592 function RSAEncrypt(text) { 593 var m = pkcs1pad2(text, (this.n.bitLength() + 7) >> 3); 594 if (m == null) return null; 595 var c = this.doPublic(m); 596 if (c == null) return null; 597 var h = c.toString(16); 598 if ((h.length & 1) == 0) return h; else return "0" + h; 599 } 600 RSAKey.prototype.doPublic = RSADoPublic; 601 RSAKey.prototype.setPublic = RSASetPublic; 602 RSAKey.prototype.encrypt = RSAEncrypt; 603 var b64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 604 var b64pad = "="; 605 function hex2b64(h) { 606 var i; 607 var c; 608 var ret = ""; 609 for (i = 0; i + 3 <= h.length; i += 3) { 610 c = parseInt(h.substring(i, i + 3), 16); 611 ret += b64map.charAt(c >> 6) + b64map.charAt(c & 63); 612 } 613 if (i + 1 == h.length) { 614 c = parseInt(h.substring(i, i + 1), 16); 615 ret += b64map.charAt(c << 2); 616 } 617 else if (i + 2 == h.length) { 618 c = parseInt(h.substring(i, i + 2), 16); 619 ret += b64map.charAt(c >> 2) + b64map.charAt((c & 3) << 4); 620 } 621 while ((ret.length & 3) > 0) ret += b64pad; 622 return ret; 623 } 624 function b64tohex(s) { 625 var ret = "" 626 var i; 627 var k = 0; 628 var slop; 629 for (i = 0; i < s.length; ++i) { 630 if (s.charAt(i) == b64pad) break; 631 v = b64map.indexOf(s.charAt(i)); 632 if (v < 0) continue; 633 if (k == 0) { 634 ret += int2char(v >> 2); 635 slop = v & 3; 636 k = 1; 637 } 638 else if (k == 1) { 639 ret += int2char((slop << 2) | (v >> 4)); 640 slop = v & 0xf; 641 k = 2; 642 } 643 else if (k == 2) { 644 ret += int2char(slop); 645 ret += int2char(v >> 2); 646 slop = v & 3; 647 k = 3; 648 } 649 else { 650 ret += int2char((slop << 2) | (v >> 4)); 651 ret += int2char(v & 0xf); 652 k = 0; 653 } 654 } 655 if (k == 1) 656 ret += int2char(slop << 2); 657 return ret; 658 } 659 function b64toBA(s) { 660 661 var h = b64tohex(s); 662 var i; 663 var a = new Array(); 664 for (i = 0; 2 * i < h.length; ++i) { 665 a[i] = parseInt(h.substring(2 * i, 2 * i + 2), 16); 666 } 667 return a; 668 }
Case Three
1 function OnBeforeLoginClick() { 2 3 var pwd = $("PlainPass").value; 4 5 var maskValue = "xxxxxxxxxxxxxxxxxxxxx".substring(0, pwd.length); 6 $("PlainPass").value = maskValue; 7 8 var modulus = '公钥modulus'; 9 var exponent = '公钥exponent'; 10 11 var rsa = new RSAKey(); 12 rsa.setPublic(modulus, exponent); 13 14 var res = rsa.encrypt(pwd); 15 if (res) { 16 $("hfPassword").value = res; 17 } 18 19 return true; 20 }