From b55ed280ddadcf9245af56658e28de0112bfe939 Mon Sep 17 00:00:00 2001 From: Quinn Slack Date: Tue, 19 Apr 2011 05:14:44 -0700 Subject: [PATCH] srp implementation --- core/srp.js | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 core/srp.js diff --git a/core/srp.js b/core/srp.js new file mode 100644 index 0000000..417cd5e --- /dev/null +++ b/core/srp.js @@ -0,0 +1,93 @@ +/** @fileOverview Javascript SRP implementation. + * + * @author Quinn Slack + */ + +/** + * Compute the SRP verifier from the username, password, salt, and group. + * @class SRP + */ +sjcl.keyexchange.srp = { + makeVerifier: function(I, P, s, N, g) { + var x; + // From RFC 5054: + // v = g^x mod N + x = this.makeX(I, P, s); + x = sjcl.bn.fromBits(x); + return g.powermod(x, N); + }, + + makeX: function(I, P, s) { + var inner; + // From RFC 2945: + // x = SHA1( | SHA( | ":" | )) + inner = sjcl.hash.sha1.hash(I + ':' + P); + return sjcl.hash.sha1.hash(sjcl.bitArray.concat(s, inner)); + }, + + /** + * Returns the known SRP group with the given size (in bits). + * @param {String} i The size of the known SRP group. + * @return {Object} An object with "N" and "g" properties. + */ + knownGroup:function(i) { + if (typeof i !== "string") { i = i.toString(); } + if (!this._didInitKnownGroups) { this._initKnownGroups(); } + return this._knownGroups[i]; + }, + + /** + * Initializes bignum objects for known group parameters. + * @private + */ + _didInitKnownGroups: false, + _initKnownGroups:function() { + var i, size, group; + for (i=0; i < this._knownGroupSizes.length; i++) { + size = this._knownGroupSizes[i].toString(); + group = this._knownGroups[size]; + group.N = new sjcl.bn(group.N); + group.g = new sjcl.bn(group.g); + } + this._didInitKnownGroups = true; + }, + + _knownGroupSizes: [1024, 1536, 2048], + _knownGroups: { + 1024: { + N: "EEAF0AB9ADB38DD69C33F80AFA8FC5E86072618775FF3C0B9EA2314C" + + "9C256576D674DF7496EA81D3383B4813D692C6E0E0D5D8E250B98BE4" + + "8E495C1D6089DAD15DC7D7B46154D6B6CE8EF4AD69B15D4982559B29" + + "7BCF1885C529F566660E57EC68EDBC3C05726CC02FD4CBF4976EAA9A" + + "FD5138FE8376435B9FC61D2FC0EB06E3", + g:2 + }, + + 1536: { + N: "9DEF3CAFB939277AB1F12A8617A47BBBDBA51DF499AC4C80BEEEA961" + + "4B19CC4D5F4F5F556E27CBDE51C6A94BE4607A291558903BA0D0F843" + + "80B655BB9A22E8DCDF028A7CEC67F0D08134B1C8B97989149B609E0B" + + "E3BAB63D47548381DBC5B1FC764E3F4B53DD9DA1158BFD3E2B9C8CF5" + + "6EDF019539349627DB2FD53D24B7C48665772E437D6C7F8CE442734A" + + "F7CCB7AE837C264AE3A9BEB87F8A2FE9B8B5292E5A021FFF5E91479E" + + "8CE7A28C2442C6F315180F93499A234DCF76E3FED135F9BB", + g: 2 + }, + + 2048: { + N: "AC6BDB41324A9A9BF166DE5E1389582FAF72B6651987EE07FC319294" + + "3DB56050A37329CBB4A099ED8193E0757767A13DD52312AB4B03310D" + + "CD7F48A9DA04FD50E8083969EDB767B0CF6095179A163AB3661A05FB" + + "D5FAAAE82918A9962F0B93B855F97993EC975EEAA80D740ADBF4FF74" + + "7359D041D5C33EA71D281E446B14773BCA97B43A23FB801676BD207A" + + "436C6481F1D2B9078717461A5B9D32E688F87748544523B524B0D57D" + + "5EA77A2775D2ECFA032CFBDBF52FB3786160279004E57AE6AF874E73" + + "03CE53299CCC041C7BC308D82A5698F3A8D0C38271AE35F8E9DBFBB6" + + "94B5C803D89F7AE435DE236D525F54759B65E372FCD68EF20FA7111F" + + "9E4AFF73", + g: 2 + } + } + +}; +