sr-iHealthwx/js/security.js

(function($w) {

	if (typeof $w.RSAUtils === 'undefined')
		var RSAUtils = $w.RSAUtils = {};

	var biRadixBase = 2;
	var biRadixBits = 16;
	var bitsPerDigit = biRadixBits;
	var biRadix = 1 << 16; // = 2^16 = 65536
	var biHalfRadix = biRadix >>> 1;
	var biRadixSquared = biRadix * biRadix;
	var maxDigitVal = biRadix - 1;
	var maxInteger = 9999999999999998;

	//maxDigits:
	//Change this to accommodate your largest number size. Use setMaxDigits()
	//to change it!
	//
	//In general, if you're working with numbers of size N bits, you'll need 2*N
	//bits of storage. Each digit holds 16 bits. So, a 1024-bit key will need
	//
	//1024 * 2 / 16 = 128 digits of storage.
	//
	var maxDigits;
	var ZERO_ARRAY;
	var bigZero, bigOne;

	var BigInt = $w.BigInt = function(flag) {
		if (typeof flag == "boolean" && flag == true) {
			this.digits = null;
		} else {
			this.digits = ZERO_ARRAY.slice(0);
		}
		this.isNeg = false;
	};

	RSAUtils.setMaxDigits = function(value) {
		maxDigits = value;
		ZERO_ARRAY = new Array(maxDigits);
		for (var iza = 0; iza < ZERO_ARRAY.length; iza++) ZERO_ARRAY[iza] = 0;
		bigZero = new BigInt();
		bigOne = new BigInt();
		bigOne.digits[0] = 1;
	};
	RSAUtils.setMaxDigits(20);

	//The maximum number of digits in base 10 you can convert to an
	//integer without JavaScript throwing up on you.
	var dpl10 = 15;

	RSAUtils.biFromNumber = function(i) {
		var result = new BigInt();
		result.isNeg = i < 0;
		i = Math.abs(i);
		var j = 0;
		while (i > 0) {
			result.digits[j++] = i & maxDigitVal;
			i = Math.floor(i / biRadix);
		}
		return result;
	};

	//lr10 = 10 ^ dpl10
	var lr10 = RSAUtils.biFromNumber(1000000000000000);

	RSAUtils.biFromDecimal = function(s) {
		var isNeg = s.charAt(0) == '-';
		var i = isNeg ? 1 : 0;
		var result;
		// Skip leading zeros.
		while (i < s.length && s.charAt(i) == '0') ++i;
		if (i == s.length) {
			result = new BigInt();
		} else {
			var digitCount = s.length - i;
			var fgl = digitCount % dpl10;
			if (fgl == 0) fgl = dpl10;
			result = RSAUtils.biFromNumber(Number(s.substr(i, fgl)));
			i += fgl;
			while (i < s.length) {
				result = RSAUtils.biAdd(RSAUtils.biMultiply(result, lr10),
					RSAUtils.biFromNumber(Number(s.substr(i, dpl10))));
				i += dpl10;
			}
			result.isNeg = isNeg;
		}
		return result;
	};

	RSAUtils.biCopy = function(bi) {
		var result = new BigInt(true);
		result.digits = bi.digits.slice(0);
		result.isNeg = bi.isNeg;
		return result;
	};

	RSAUtils.reverseStr = function(s) {
		var result = "";
		for (var i = s.length - 1; i > -1; --i) {
			result += s.charAt(i);
		}
		return result;
	};

	var hexatrigesimalToChar = [
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
		'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
		'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
		'u', 'v', 'w', 'x', 'y', 'z'
	];

	RSAUtils.biToString = function(x, radix) { // 2 <= radix <= 36
		var b = new BigInt();
		b.digits[0] = radix;
		var qr = RSAUtils.biDivideModulo(x, b);
		var result = hexatrigesimalToChar[qr[1].digits[0]];
		while (RSAUtils.biCompare(qr[0], bigZero) == 1) {
			qr = RSAUtils.biDivideModulo(qr[0], b);
			digit = qr[1].digits[0];
			result += hexatrigesimalToChar[qr[1].digits[0]];
		}
		return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);
	};

	RSAUtils.biToDecimal = function(x) {
		var b = new BigInt();
		b.digits[0] = 10;
		var qr = RSAUtils.biDivideModulo(x, b);
		var result = String(qr[1].digits[0]);
		while (RSAUtils.biCompare(qr[0], bigZero) == 1) {
			qr = RSAUtils.biDivideModulo(qr[0], b);
			result += String(qr[1].digits[0]);
		}
		return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);
	};

	var hexToChar = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
		'a', 'b', 'c', 'd', 'e', 'f'
	];

	RSAUtils.digitToHex = function(n) {
		var mask = 0xf;
		var result = "";
		for (i = 0; i < 4; ++i) {
			result += hexToChar[n & mask];
			n >>>= 4;
		}
		return RSAUtils.reverseStr(result);
	};

	RSAUtils.biToHex = function(x) {
		var result = "";
		var n = RSAUtils.biHighIndex(x);
		for (var i = RSAUtils.biHighIndex(x); i > -1; --i) {
			result += RSAUtils.digitToHex(x.digits[i]);
		}
		return result;
	};

	RSAUtils.charToHex = function(c) {
		var ZERO = 48;
		var NINE = ZERO + 9;
		var littleA = 97;
		var littleZ = littleA + 25;
		var bigA = 65;
		var bigZ = 65 + 25;
		var result;

		if (c >= ZERO && c <= NINE) {
			result = c - ZERO;
		} else if (c >= bigA && c <= bigZ) {
			result = 10 + c - bigA;
		} else if (c >= littleA && c <= littleZ) {
			result = 10 + c - littleA;
		} else {
			result = 0;
		}
		return result;
	};

	RSAUtils.hexToDigit = function(s) {
		var result = 0;
		var sl = Math.min(s.length, 4);
		for (var i = 0; i < sl; ++i) {
			result <<= 4;
			result |= RSAUtils.charToHex(s.charCodeAt(i));
		}
		return result;
	};

	RSAUtils.biFromHex = function(s) {
		var result = new BigInt();
		var sl = s.length;
		for (var i = sl, j = 0; i > 0; i -= 4, ++j) {
			result.digits[j] = RSAUtils.hexToDigit(s.substr(Math.max(i - 4, 0), Math.min(i, 4)));
		}
		return result;
	};

	RSAUtils.biFromString = function(s, radix) {
		var isNeg = s.charAt(0) == '-';
		var istop = isNeg ? 1 : 0;
		var result = new BigInt();
		var place = new BigInt();
		place.digits[0] = 1; // radix^0
		for (var i = s.length - 1; i >= istop; i--) {
			var c = s.charCodeAt(i);
			var digit = RSAUtils.charToHex(c);
			var biDigit = RSAUtils.biMultiplyDigit(place, digit);
			result = RSAUtils.biAdd(result, biDigit);
			place = RSAUtils.biMultiplyDigit(place, radix);
		}
		result.isNeg = isNeg;
		return result;
	};

	RSAUtils.biDump = function(b) {
		return (b.isNeg ? "-" : "") + b.digits.join(" ");
	};

	RSAUtils.biAdd = function(x, y) {
		var result;

		if (x.isNeg != y.isNeg) {
			y.isNeg = !y.isNeg;
			result = RSAUtils.biSubtract(x, y);
			y.isNeg = !y.isNeg;
		} else {
			result = new BigInt();
			var c = 0;
			var n;
			for (var i = 0; i < x.digits.length; ++i) {
				n = x.digits[i] + y.digits[i] + c;
				result.digits[i] = n % biRadix;
				c = Number(n >= biRadix);
			}
			result.isNeg = x.isNeg;
		}
		return result;
	};

	RSAUtils.biSubtract = function(x, y) {
		var result;
		if (x.isNeg != y.isNeg) {
			y.isNeg = !y.isNeg;
			result = RSAUtils.biAdd(x, y);
			y.isNeg = !y.isNeg;
		} else {
			result = new BigInt();
			var n, c;
			c = 0;
			for (var i = 0; i < x.digits.length; ++i) {
				n = x.digits[i] - y.digits[i] + c;
				result.digits[i] = n % biRadix;
				// Stupid non-conforming modulus operation.
				if (result.digits[i] < 0) result.digits[i] += biRadix;
				c = 0 - Number(n < 0);
			}
			// Fix up the negative sign, if any.
			if (c == -1) {
				c = 0;
				for (var i = 0; i < x.digits.length; ++i) {
					n = 0 - result.digits[i] + c;
					result.digits[i] = n % biRadix;
					// Stupid non-conforming modulus operation.
					if (result.digits[i] < 0) result.digits[i] += biRadix;
					c = 0 - Number(n < 0);
				}
				// Result is opposite sign of arguments.
				result.isNeg = !x.isNeg;
			} else {
				// Result is same sign.
				result.isNeg = x.isNeg;
			}
		}
		return result;
	};

	RSAUtils.biHighIndex = function(x) {
		var result = x.digits.length - 1;
		while (result > 0 && x.digits[result] == 0) --result;
		return result;
	};

	RSAUtils.biNumBits = function(x) {
		var n = RSAUtils.biHighIndex(x);
		var d = x.digits[n];
		var m = (n + 1) * bitsPerDigit;
		var result;
		for (result = m; result > m - bitsPerDigit; --result) {
			if ((d & 0x8000) != 0) break;
			d <<= 1;
		}
		return result;
	};

	RSAUtils.biMultiply = function(x, y) {
		var result = new BigInt();
		var c;
		var n = RSAUtils.biHighIndex(x);
		var t = RSAUtils.biHighIndex(y);
		var u, uv, k;

		for (var i = 0; i <= t; ++i) {
			c = 0;
			k = i;
			for (j = 0; j <= n; ++j, ++k) {
				uv = result.digits[k] + x.digits[j] * y.digits[i] + c;
				result.digits[k] = uv & maxDigitVal;
				c = uv >>> biRadixBits;
				//c = Math.floor(uv / biRadix);
			}
			result.digits[i + n + 1] = c;
		}
		// Someone give me a logical xor, please.
		result.isNeg = x.isNeg != y.isNeg;
		return result;
	};

	RSAUtils.biMultiplyDigit = function(x, y) {
		var n, c, uv;

		result = new BigInt();
		n = RSAUtils.biHighIndex(x);
		c = 0;
		for (var j = 0; j <= n; ++j) {
			uv = result.digits[j] + x.digits[j] * y + c;
			result.digits[j] = uv & maxDigitVal;
			c = uv >>> biRadixBits;
			//c = Math.floor(uv / biRadix);
		}
		result.digits[1 + n] = c;
		return result;
	};

	RSAUtils.arrayCopy = function(src, srcStart, dest, destStart, n) {
		var m = Math.min(srcStart + n, src.length);
		for (var i = srcStart, j = destStart; i < m; ++i, ++j) {
			dest[j] = src[i];
		}
	};

	var highBitMasks = [0x0000, 0x8000, 0xC000, 0xE000, 0xF000, 0xF800,
		0xFC00, 0xFE00, 0xFF00, 0xFF80, 0xFFC0, 0xFFE0,
		0xFFF0, 0xFFF8, 0xFFFC, 0xFFFE, 0xFFFF
	];

	RSAUtils.biShiftLeft = function(x, n) {
		var digitCount = Math.floor(n / bitsPerDigit);
		var result = new BigInt();
		RSAUtils.arrayCopy(x.digits, 0, result.digits, digitCount,
			result.digits.length - digitCount);
		var bits = n % bitsPerDigit;
		var rightBits = bitsPerDigit - bits;
		for (var i = result.digits.length - 1, i1 = i - 1; i > 0; --i, --i1) {
			result.digits[i] = ((result.digits[i] << bits) & maxDigitVal) |
				((result.digits[i1] & highBitMasks[bits]) >>>
					(rightBits));
		}
		result.digits[0] = ((result.digits[i] << bits) & maxDigitVal);
		result.isNeg = x.isNeg;
		return result;
	};

	var lowBitMasks = [0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F,
		0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF,
		0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF
	];

	RSAUtils.biShiftRight = function(x, n) {
		var digitCount = Math.floor(n / bitsPerDigit);
		var result = new BigInt();
		RSAUtils.arrayCopy(x.digits, digitCount, result.digits, 0,
			x.digits.length - digitCount);
		var bits = n % bitsPerDigit;
		var leftBits = bitsPerDigit - bits;
		for (var i = 0, i1 = i + 1; i < result.digits.length - 1; ++i, ++i1) {
			result.digits[i] = (result.digits[i] >>> bits) |
				((result.digits[i1] & lowBitMasks[bits]) << leftBits);
		}
		result.digits[result.digits.length - 1] >>>= bits;
		result.isNeg = x.isNeg;
		return result;
	};

	RSAUtils.biMultiplyByRadixPower = function(x, n) {
		var result = new BigInt();
		RSAUtils.arrayCopy(x.digits, 0, result.digits, n, result.digits.length - n);
		return result;
	};

	RSAUtils.biDivideByRadixPower = function(x, n) {
		var result = new BigInt();
		RSAUtils.arrayCopy(x.digits, n, result.digits, 0, result.digits.length - n);
		return result;
	};

	RSAUtils.biModuloByRadixPower = function(x, n) {
		var result = new BigInt();
		RSAUtils.arrayCopy(x.digits, 0, result.digits, 0, n);
		return result;
	};

	RSAUtils.biCompare = function(x, y) {
		if (x.isNeg != y.isNeg) {
			return 1 - 2 * Number(x.isNeg);
		}
		for (var i = x.digits.length - 1; i >= 0; --i) {
			if (x.digits[i] != y.digits[i]) {
				if (x.isNeg) {
					return 1 - 2 * Number(x.digits[i] > y.digits[i]);
				} else {
					return 1 - 2 * Number(x.digits[i] < y.digits[i]);
				}
			}
		}
		return 0;
	};

	RSAUtils.biDivideModulo = function(x, y) {
		var nb = RSAUtils.biNumBits(x);
		var tb = RSAUtils.biNumBits(y);
		var origYIsNeg = y.isNeg;
		var q, r;
		if (nb < tb) {
			// |x| < |y|
			if (x.isNeg) {
				q = RSAUtils.biCopy(bigOne);
				q.isNeg = !y.isNeg;
				x.isNeg = false;
				y.isNeg = false;
				r = biSubtract(y, x);
				// Restore signs, 'cause they're references.
				x.isNeg = true;
				y.isNeg = origYIsNeg;
			} else {
				q = new BigInt();
				r = RSAUtils.biCopy(x);
			}
			return [q, r];
		}

		q = new BigInt();
		r = x;

		// Normalize Y.
		var t = Math.ceil(tb / bitsPerDigit) - 1;
		var lambda = 0;
		while (y.digits[t] < biHalfRadix) {
			y = RSAUtils.biShiftLeft(y, 1);
			++lambda;
			++tb;
			t = Math.ceil(tb / bitsPerDigit) - 1;
		}
		// Shift r over to keep the quotient constant. We'll shift the
		// remainder back at the end.
		r = RSAUtils.biShiftLeft(r, lambda);
		nb += lambda; // Update the bit count for x.
		var n = Math.ceil(nb / bitsPerDigit) - 1;

		var b = RSAUtils.biMultiplyByRadixPower(y, n - t);
		while (RSAUtils.biCompare(r, b) != -1) {
			++q.digits[n - t];
			r = RSAUtils.biSubtract(r, b);
		}
		for (var i = n; i > t; --i) {
			var ri = (i >= r.digits.length) ? 0 : r.digits[i];
			var ri1 = (i - 1 >= r.digits.length) ? 0 : r.digits[i - 1];
			var ri2 = (i - 2 >= r.digits.length) ? 0 : r.digits[i - 2];
			var yt = (t >= y.digits.length) ? 0 : y.digits[t];
			var yt1 = (t - 1 >= y.digits.length) ? 0 : y.digits[t - 1];
			if (ri == yt) {
				q.digits[i - t - 1] = maxDigitVal;
			} else {
				q.digits[i - t - 1] = Math.floor((ri * biRadix + ri1) / yt);
			}

			var c1 = q.digits[i - t - 1] * ((yt * biRadix) + yt1);
			var c2 = (ri * biRadixSquared) + ((ri1 * biRadix) + ri2);
			while (c1 > c2) {
				--q.digits[i - t - 1];
				c1 = q.digits[i - t - 1] * ((yt * biRadix) | yt1);
				c2 = (ri * biRadix * biRadix) + ((ri1 * biRadix) + ri2);
			}

			b = RSAUtils.biMultiplyByRadixPower(y, i - t - 1);
			r = RSAUtils.biSubtract(r, RSAUtils.biMultiplyDigit(b, q.digits[i - t - 1]));
			if (r.isNeg) {
				r = RSAUtils.biAdd(r, b);
				--q.digits[i - t - 1];
			}
		}
		r = RSAUtils.biShiftRight(r, lambda);
		// Fiddle with the signs and stuff to make sure that 0 <= r < y.
		q.isNeg = x.isNeg != origYIsNeg;
		if (x.isNeg) {
			if (origYIsNeg) {
				q = RSAUtils.biAdd(q, bigOne);
			} else {
				q = RSAUtils.biSubtract(q, bigOne);
			}
			y = RSAUtils.biShiftRight(y, lambda);
			r = RSAUtils.biSubtract(y, r);
		}
		// Check for the unbelievably stupid degenerate case of r == -0.
		if (r.digits[0] == 0 && RSAUtils.biHighIndex(r) == 0) r.isNeg = false;

		return [q, r];
	};

	RSAUtils.biDivide = function(x, y) {
		return RSAUtils.biDivideModulo(x, y)[0];
	};

	RSAUtils.biModulo = function(x, y) {
		return RSAUtils.biDivideModulo(x, y)[1];
	};

	RSAUtils.biMultiplyMod = function(x, y, m) {
		return RSAUtils.biModulo(RSAUtils.biMultiply(x, y), m);
	};

	RSAUtils.biPow = function(x, y) {
		var result = bigOne;
		var a = x;
		while (true) {
			if ((y & 1) != 0) result = RSAUtils.biMultiply(result, a);
			y >>= 1;
			if (y == 0) break;
			a = RSAUtils.biMultiply(a, a);
		}
		return result;
	};

	RSAUtils.biPowMod = function(x, y, m) {
		var result = bigOne;
		var a = x;
		var k = y;
		while (true) {
			if ((k.digits[0] & 1) != 0) result = RSAUtils.biMultiplyMod(result, a, m);
			k = RSAUtils.biShiftRight(k, 1);
			if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0) break;
			a = RSAUtils.biMultiplyMod(a, a, m);
		}
		return result;
	};

	$w.BarrettMu = function(m) {
		this.modulus = RSAUtils.biCopy(m);
		this.k = RSAUtils.biHighIndex(this.modulus) + 1;
		var b2k = new BigInt();
		b2k.digits[2 * this.k] = 1; // b2k = b^(2k)
		this.mu = RSAUtils.biDivide(b2k, this.modulus);
		this.bkplus1 = new BigInt();
		this.bkplus1.digits[this.k + 1] = 1; // bkplus1 = b^(k+1)
		this.modulo = BarrettMu_modulo;
		this.multiplyMod = BarrettMu_multiplyMod;
		this.powMod = BarrettMu_powMod;
	};

	function BarrettMu_modulo(x) {
		var $dmath = RSAUtils;
		var q1 = $dmath.biDivideByRadixPower(x, this.k - 1);
		var q2 = $dmath.biMultiply(q1, this.mu);
		var q3 = $dmath.biDivideByRadixPower(q2, this.k + 1);
		var r1 = $dmath.biModuloByRadixPower(x, this.k + 1);
		var r2term = $dmath.biMultiply(q3, this.modulus);
		var r2 = $dmath.biModuloByRadixPower(r2term, this.k + 1);
		var r = $dmath.biSubtract(r1, r2);
		if (r.isNeg) {
			r = $dmath.biAdd(r, this.bkplus1);
		}
		var rgtem = $dmath.biCompare(r, this.modulus) >= 0;
		while (rgtem) {
			r = $dmath.biSubtract(r, this.modulus);
			rgtem = $dmath.biCompare(r, this.modulus) >= 0;
		}
		return r;
	}

	function BarrettMu_multiplyMod(x, y) {
		/*
		x = this.modulo(x);
		y = this.modulo(y);
		*/
		var xy = RSAUtils.biMultiply(x, y);
		return this.modulo(xy);
	}

	function BarrettMu_powMod(x, y) {
		var result = new BigInt();
		result.digits[0] = 1;
		var a = x;
		var k = y;
		while (true) {
			if ((k.digits[0] & 1) != 0) result = this.multiplyMod(result, a);
			k = RSAUtils.biShiftRight(k, 1);
			if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0) break;
			a = this.multiplyMod(a, a);
		}
		return result;
	}

	var RSAKeyPair = function(encryptionExponent, decryptionExponent, modulus) {
		var $dmath = RSAUtils;
		this.e = $dmath.biFromHex(encryptionExponent);
		this.d = $dmath.biFromHex(decryptionExponent);
		this.m = $dmath.biFromHex(modulus);
		// We can do two bytes per digit, so
		// chunkSize = 2 * (number of digits in modulus - 1).
		// Since biHighIndex returns the high index, not the number of digits, 1 has
		// already been subtracted.
		this.chunkSize = 2 * $dmath.biHighIndex(this.m);
		this.radix = 16;
		this.barrett = new $w.BarrettMu(this.m);
	};

	RSAUtils.getKeyPair = function(encryptionExponent, decryptionExponent, modulus) {
		return new RSAKeyPair(encryptionExponent, decryptionExponent, modulus);
	};

	if (typeof $w.twoDigit === 'undefined') {
		$w.twoDigit = function(n) {
			return (n < 10 ? "0" : "") + String(n);
		};
	}

	// Altered by Rob Saunders (rob@robsaunders.net). New routine pads the
	// string after it has been converted to an array. This fixes an
	// incompatibility with Flash MX's ActionScript.
	RSAUtils.encryptedString = function(key, s) {
		console.log(key);
		var a = [];
		var sl = s.length;
		var i = 0;
		while (i < sl) {
			a[i] = s.charCodeAt(i);
			i++;
		}

		while (a.length % key.chunkSize != 0) {
			a[i++] = 0;
		}

		var al = a.length;
		var result = "";
		var j, k, block;
		for (i = 0; i < al; i += key.chunkSize) {
			block = new BigInt();
			j = 0;
			for (k = i; k < i + key.chunkSize; ++j) {
				block.digits[j] = a[k++];
				block.digits[j] += a[k++] << 8;
			}
			var crypt = key.barrett.powMod(block, key.e);
			var text = key.radix == 16 ? RSAUtils.biToHex(crypt) : RSAUtils.biToString(crypt, key.radix);
			result += text + " ";
		}
		return result.substring(0, result.length - 1); // Remove last space.
	};

	RSAUtils.decryptedString = function(key, s) {
		var blocks = s.split(" ");
		var result = "";
		var i, j, block;
		for (i = 0; i < blocks.length; ++i) {
			var bi;
			if (key.radix == 16) {
				bi = RSAUtils.biFromHex(blocks[i]);
			} else {
				bi = RSAUtils.biFromString(blocks[i], key.radix);
			}
			block = key.barrett.powMod(bi, key.d);
			for (j = 0; j <= RSAUtils.biHighIndex(block); ++j) {
				result += String.fromCharCode(block.digits[j] & 255,
					block.digits[j] >> 8);
			}
		}
		// Remove trailing null, if any.
		if (result.charCodeAt(result.length - 1) == 0) {
			result = result.substring(0, result.length - 1);
		}
		return result;
	};

	RSAUtils.setMaxDigits(130);

	/**
	 * 通过ajax 同步请求，来获取key的参数 modulus,exponent；
	 * 通过encodeURIComponent(String str) 对中文文本转换成URL编码
	 * 通过RSAUtils.encryptedString(Object key, String str) 对URL编码后的文本进行加密
	 * @return {Object} key
	 * @param {string} serverUrl
	 * 
	 */
	RSAUtils.getKeyFromServer=function(serverUrl) {
		var keyObj;
		mui.ajax({
			url: serverUrl,
			async: false,
			data: {},
			dataType: 'json', //服务器返回json格式数据
			type: 'post', //HTTP请求类型
			timeout: 10000, //超时时间设置为10秒；
			success: function(data) {
				var mod = data.data.modulus;
				var exp = data.data.exponent;
				keyObj = RSAUtils.getKeyPair(exp, "", mod);
			},
			error: function(xhr, type, errorThrown) {
				console.log("error:" + xhr + type + errorThrown);
			}
		});
		return keyObj;
	}
	
	/*
	 * 加密文本 
	 */
	RSAUtils.encryStr=function (key,str) {
		var temp=encodeURIComponent(str);
		var encryedStr=RSAUtils.encryptedString(key,temp);
		return encryedStr;
	}
	
})(window);
/*操作示例
<script type="text/javascript">
		var serverURL = "http://172.19.103.77:8080/wlyy/login/public_key"; //服务器地址
		var key;
		key=RSAUtils.getKeyFromServer(serverURL);	//调用方法获取key			
		document.querySelector("#encrypt").addEventListener("tap", function() {  //点击事件加密文本
			if (!key) {
				key=getKeyFromServer(serverURL);
			}
			encryStr();
		});

		function encryStr() {
			var pwdStr = document.querySelector("input").value;
			var pwd=encodeURIComponent(pwdStr);				//把文本转换成URL 编码
			console.log("pwd : "+pwd);
			var encryStr = RSAUtils.encryptedString(key, pwd);
			console.log(encryStr);
			document.querySelector("textarea").innerText = encryStr;
		}
	</script>
*/