support for compressed pub key import
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@ -2286,26 +2286,37 @@ ECPointFp.prototype.getEncoded = function (compressed) {
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return enc;
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};
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ECPointFp.decodeFrom = function (curve, enc) {
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ECPointFp.decodeFrom = function (ecparams, enc) {
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var type = enc[0];
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var dataLen = enc.length-1;
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// Extract x and y as byte arrays
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var xBa = enc.slice(1, 1 + dataLen/2);
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var yBa = enc.slice(1 + dataLen/2, 1 + dataLen);
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// Prepend zero byte to prevent interpretation as negative integer
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xBa.unshift(0);
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yBa.unshift(0);
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// Convert to BigIntegers
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var x = new BigInteger(xBa);
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var y = new BigInteger(yBa);
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if (type == 4) {
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var xBa = enc.slice(1, 1 + dataLen/2),
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yBa = enc.slice(1 + dataLen/2, 1 + dataLen),
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x = BigInteger.fromByteArrayUnsigned(xBa),
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y = BigInteger.fromByteArrayUnsigned(yBa);
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}
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else {
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var xBa = enc.slice(1),
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x = BigInteger.fromByteArrayUnsigned(xBa),
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p = ecparams.getQ(),
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xCubedPlus7 = x.multiply(x).multiply(x).add(new BigInteger('7')).mod(p),
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pPlus1Over4 = p.add(new BigInteger('1'))
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.divide(new BigInteger('4')),
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y = xCubedPlus7.modPow(pPlus1Over4,p);
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if (y.mod(new BigInteger('2')).toString() != ''+(type % 2)) {
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y = p.subtract(y)
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}
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}
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// Return point
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return new ECPointFp(curve, curve.fromBigInteger(x), curve.fromBigInteger(y));
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return new ECPointFp(ecparams,
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ecparams.fromBigInteger(x),
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ecparams.fromBigInteger(y));
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};
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ECPointFp.prototype.add2D = function (b) {
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if(this.isInfinity()) return b;
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if(b.isInfinity()) return this;
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