Diffstat (limited to 'frontend/beta/js/Clipperz/Crypto/ECC/BinaryField/Value.js') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | frontend/beta/js/Clipperz/Crypto/ECC/BinaryField/Value.js | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/frontend/beta/js/Clipperz/Crypto/ECC/BinaryField/Value.js b/frontend/beta/js/Clipperz/Crypto/ECC/BinaryField/Value.js new file mode 100644 index 0000000..10d055e --- a/dev/null +++ b/frontend/beta/js/Clipperz/Crypto/ECC/BinaryField/Value.js @@ -0,0 +1,377 @@ +/* + +Copyright 2008-2011 Clipperz Srl + +This file is part of Clipperz's Javascript Crypto Library. +Javascript Crypto Library provides web developers with an extensive +and efficient set of cryptographic functions. The library aims to +obtain maximum execution speed while preserving modularity and +reusability. +For further information about its features and functionalities please +refer to http://www.clipperz.com + +* Javascript Crypto Library is free software: you can redistribute + it and/or modify it under the terms of the GNU Affero General Public + License as published by the Free Software Foundation, either version + 3 of the License, or (at your option) any later version. + +* Javascript Crypto Library is distributed in the hope that it will + be useful, but WITHOUT ANY WARRANTY; without even the implied + warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU Affero General Public License for more details. + +* You should have received a copy of the GNU Affero General Public + License along with Javascript Crypto Library. If not, see + <http://www.gnu.org/licenses/>. + +*/ + +try { if (typeof(Clipperz.ByteArray) == 'undefined') { throw ""; }} catch (e) { + throw "Clipperz.Crypto.ECC depends on Clipperz.ByteArray!"; +} +if (typeof(Clipperz.Crypto.ECC) == 'undefined') { Clipperz.Crypto.ECC = {}; } +if (typeof(Clipperz.Crypto.ECC.BinaryField) == 'undefined') { Clipperz.Crypto.ECC.BinaryField = {}; } + +Clipperz.Crypto.ECC.BinaryField.Value = function(aValue, aBase) { + if (aValue.constructor == String) { + var value; + var stringLength; + var numberOfWords; + var i,c; + + if (aBase != 16) { + throw Clipperz.Crypto.ECC.BinaryField.Value.exception.UnsupportedBase; + } + + value = aValue.replace(/ /g, ''); + stringLength = value.length; + numberOfWords = Math.ceil(stringLength / 8); + this._value = new Array(numberOfWords); + + c = numberOfWords; + for (i=0; i<c; i++) { + var word; + + if (i < (c-1)) { + word = parseInt(value.substr(stringLength-((i+1)*8), 8), 16); + } else { + word = parseInt(value.substr(0, stringLength-(i*8)), 16); + } + + this._value[i] = word; + } + } else if (aValue.constructor == Array) { + var itemsToCopy; + + itemsToCopy = aValue.length; + while (aValue[itemsToCopy - 1] == 0) { + itemsToCopy --; + } + + this._value = aValue.slice(0, itemsToCopy); + } else if (aValue.constructor == Number) { + this._value = [aValue]; + } else { +// throw Clipperz.Crypto.ECC.BinaryField.Value.exception.UnsupportedConstructorValueType; + } + + return this; +} + +Clipperz.Crypto.ECC.BinaryField.Value.prototype = MochiKit.Base.update(null, { + + 'value': function() { + return this._value; + }, + + //----------------------------------------------------------------------------- + + 'wordSize': function() { + return this._value.length + }, + + //----------------------------------------------------------------------------- + + 'clone': function() { + return new Clipperz.Crypto.ECC.BinaryField.Value(this._value.slice(0)); + }, + + //----------------------------------------------------------------------------- + + 'isZero': function() { + return (this.compare(Clipperz.Crypto.ECC.BinaryField.Value.O) == 0); + }, + + //----------------------------------------------------------------------------- + + 'asString': function(aBase) { + var result; + var i,c; + + if (aBase != 16) { + throw Clipperz.Crypto.ECC.BinaryField.Value.exception.UnsupportedBase; + } + + result = ""; + c = this.wordSize(); + for (i=0; i<c; i++) { + var wordAsString; + +// wordAsString = ("00000000" + this.value()[i].toString(16)); + wordAsString = ("00000000" + this._value[i].toString(16)); + wordAsString = wordAsString.substring(wordAsString.length - 8); + result = wordAsString + result; + } + + result = result.replace(/^(00)*/, ""); + + if (result == "") { + result = "0"; + } + + return result; + }, + + //----------------------------------------------------------------------------- + + 'shiftLeft': function(aNumberOfBitsToShift) { + return new Clipperz.Crypto.ECC.BinaryField.Value(Clipperz.Crypto.ECC.BinaryField.Value._shiftLeft(this._value, aNumberOfBitsToShift)); + }, + + //----------------------------------------------------------------------------- + + 'bitSize': function() { + return Clipperz.Crypto.ECC.BinaryField.Value._bitSize(this._value); + }, + + //----------------------------------------------------------------------------- + + 'isBitSet': function(aBitPosition) { + return Clipperz.Crypto.ECC.BinaryField.Value._isBitSet(this._value, aBitPosition); + }, + + //----------------------------------------------------------------------------- + + 'xor': function(aValue) { + return new Clipperz.Crypto.ECC.BinaryField.Value(Clipperz.Crypto.ECC.BinaryField.Value._xor(this._value, aValue._value)); + }, + + //----------------------------------------------------------------------------- + + 'compare': function(aValue) { + return Clipperz.Crypto.ECC.BinaryField.Value._compare(this._value, aValue._value); + }, + + //----------------------------------------------------------------------------- + __syntaxFix__: "syntax fix" +}); + +Clipperz.Crypto.ECC.BinaryField.Value.O = new Clipperz.Crypto.ECC.BinaryField.Value('0', 16); +Clipperz.Crypto.ECC.BinaryField.Value.I = new Clipperz.Crypto.ECC.BinaryField.Value('1', 16); + +Clipperz.Crypto.ECC.BinaryField.Value._xor = function(a, b, aFirstItemOffset) { + var result; + var resultSize; + var i,c; + var firstItemOffset; + + firstItemOffset = aFirstItemOffset || 0; + resultSize = Math.max((a.length - firstItemOffset), b.length) + firstItemOffset; + + result = new Array(resultSize); + + c = firstItemOffset; + for (i=0; i<c; i++) { + result[i] = a[i]; + } + + c = resultSize; + for (i=firstItemOffset; i<c; i++) { + result[i] = (((a[i] || 0) ^ (b[i - firstItemOffset] || 0)) >>> 0); + } + + return result; +}; + +Clipperz.Crypto.ECC.BinaryField.Value._overwriteXor = function(a, b, aFirstItemOffset) { + var i,c; + var firstItemOffset; + + firstItemOffset = aFirstItemOffset || 0; + + c = Math.max((a.length - firstItemOffset), b.length) + firstItemOffset; + for (i=firstItemOffset; i<c; i++) { + a[i] = (((a[i] || 0) ^ (b[i - firstItemOffset] || 0)) >>> 0); + } +}; + +Clipperz.Crypto.ECC.BinaryField.Value._shiftLeft = function(aWordArray, aNumberOfBitsToShift) { + var numberOfWordsToShift; + var numberOfBitsToShift; + var result; + var overflowValue; + var i,c; + + numberOfWordsToShift = Math.floor(aNumberOfBitsToShift / 32); + numberOfBitsToShift = aNumberOfBitsToShift % 32; + + result = new Array(aWordArray.length + numberOfWordsToShift); + + c = numberOfWordsToShift; + for (i=0; i<c; i++) { + result[i] = 0; + } + + overflowValue = 0; + nextOverflowValue = 0; + + c = aWordArray.length; + for (i=0; i<c; i++) { + var value; + var resultWord; + +// value = this.value()[i]; + value = aWordArray[i]; + + if (numberOfBitsToShift > 0) { + var nextOverflowValue; + + nextOverflowValue = (value >>> (32 - numberOfBitsToShift)); + value = value & (0xffffffff >>> numberOfBitsToShift); + resultWord = (((value << numberOfBitsToShift) | overflowValue) >>> 0); + } else { + resultWord = value; + } + + result[i+numberOfWordsToShift] = resultWord; + overflowValue = nextOverflowValue; + } + + if (overflowValue != 0) { + result[aWordArray.length + numberOfWordsToShift] = overflowValue; + } + + return result; +}; + +Clipperz.Crypto.ECC.BinaryField.Value._overwriteShiftLeft = function(aWordArray, aNumberOfBitsToShift) { + var numberOfWordsToShift; + var numberOfBitsToShift; + var result; + var overflowValue; + var i,c; + + numberOfWordsToShift = Math.floor(aNumberOfBitsToShift / 32); + numberOfBitsToShift = aNumberOfBitsToShift % 32; + + result = new Array(aWordArray.length + numberOfWordsToShift); + + c = numberOfWordsToShift; + for (i=0; i<c; i++) { + result[i] = 0; + } + + overflowValue = 0; + nextOverflowValue = 0; + + c = aWordArray.length; + for (i=0; i<c; i++) { + var value; + var resultWord; + +// value = this.value()[i]; + value = aWordArray[i]; + + if (numberOfBitsToShift > 0) { + var nextOverflowValue; + + nextOverflowValue = (value >>> (32 - numberOfBitsToShift)); + value = value & (0xffffffff >>> numberOfBitsToShift); + resultWord = (((value << numberOfBitsToShift) | overflowValue) >>> 0); + } else { + resultWord = value; + } + + result[i+numberOfWordsToShift] = resultWord; + overflowValue = nextOverflowValue; + } + + if (overflowValue != 0) { + result[aWordArray.length + numberOfWordsToShift] = overflowValue; + } + + return result; +}; + +Clipperz.Crypto.ECC.BinaryField.Value._bitSize = function(aWordArray) { + var result; + var notNullElements; + var mostValuableWord; + var matchingBitsInMostImportantWord; + var mask; + var i,c; + + notNullElements = aWordArray.length; + + if ((aWordArray.length == 1) && (aWordArray[0] == 0)) { + result = 0; + } else { + while((aWordArray[notNullElements - 1] == 0) && (notNullElements > 0)) { + notNullElements --; + } + + result = (notNullElements - 1) * 32; + mostValuableWord = aWordArray[notNullElements - 1]; + + matchingBits = 32; + mask = 0x80000000; + + while ((matchingBits > 0) && ((mostValuableWord & mask) == 0)) { + matchingBits --; + mask >>>= 1; + } + + result += matchingBits; + } + + return result; +}; + +Clipperz.Crypto.ECC.BinaryField.Value._isBitSet = function(aWordArray, aBitPosition) { + var result; + var byteIndex; + var bitIndexInSelectedByte; + + byteIndex = Math.floor(aBitPosition / 32); + bitIndexInSelectedByte = aBitPosition % 32; + + if (byteIndex <= aWordArray.length) { + result = ((aWordArray[byteIndex] & (1 << bitIndexInSelectedByte)) != 0); + } else { + result = false; + } + + return result; +}; + +Clipperz.Crypto.ECC.BinaryField.Value._compare = function(a,b) { + var result; + var i,c; + + result = MochiKit.Base.compare(a.length, b.length); + + c = a.length; + for (i=0; (i<c) && (result==0); i++) { +//console.log("compare[" + c + " - " + i + " - 1] " + this.value()[c-i-1] + ", " + aValue.value()[c-i-1]); +// result = MochiKit.Base.compare(this.value()[c-i-1], aValue.value()[c-i-1]); + result = MochiKit.Base.compare(a[c-i-1], b[c-i-1]); + } + + return result; +}; + + +Clipperz.Crypto.ECC.BinaryField.Value['exception']= { + 'UnsupportedBase': new MochiKit.Base.NamedError("Clipperz.Crypto.ECC.BinaryField.Value.exception.UnsupportedBase"), + 'UnsupportedConstructorValueType': new MochiKit.Base.NamedError("Clipperz.Crypto.ECC.BinaryField.Value.exception.UnsupportedConstructorValueType") +}; |