ECP.fromBytes = function()

in src/ecp.js [1356:1400]

• 34 lines of code
• 9 McCabe index (conditional complexity)

    ECP.fromBytes = function(b) {
        var t = [],
            P = new ECP(),
            p = new ctx.BIG(0),
            px, py, i;

        p.rcopy(ctx.ROM_FIELD.Modulus);

        for (i = 0; i < ctx.BIG.MODBYTES; i++) {
            t[i] = b[i + 1];
        }

        px = ctx.BIG.fromBytes(t);
        if (ctx.BIG.comp(px, p) >= 0) {
            return P;
        }

        if (ECP.CURVETYPE == ECP.MONTGOMERY) {
            P.setx(px);
            return P;
        }

        if (b[0] == 0x04) {
            for (i = 0; i < ctx.BIG.MODBYTES; i++) {
                t[i] = b[i + ctx.BIG.MODBYTES + 1];
            }

            py = ctx.BIG.fromBytes(t);

            if (ctx.BIG.comp(py, p) >= 0) {
                return P;
            }

            P.setxy(px, py);

            return P;
        }

        if (b[0]==0x02 || b[0]==0x03) {
            P.setxi(px,b[0]&1);
            return P;
        }

        return P;
    };