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add signing

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This commit is contained in:
Pieter Wuille
2013-03-18 02:41:01 +01:00
parent 607884fc11
commit 0a07e62f6f
12 changed files with 121 additions and 6 deletions
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26
ecmult.cpp
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@@ -112,6 +112,8 @@ class ECMultConsts {
public:
WNAFPrecomp<GroupElem,WINDOW_G> wpg;
WNAFPrecomp<GroupElem,WINDOW_G> wpg128;
GroupElem prec[64][16]; // prec[j][i] = 16^j * (i+1) * G
GroupElem fin; // -(sum(prec[j][0], j=0..63))
ECMultConsts() {
const GroupElem &g = GetGroupConst().g;
@@ -121,6 +123,20 @@ public:
GroupElem g128; g128.SetJac(g128j);
wpg.Build(g);
wpg128.Build(g128);
GroupElemJac gg(g);
GroupElem ad(g);
GroupElemJac fn;
for (int j=0; j<64; j++) {
prec[j][0].SetJac(gg);
fn.SetAdd(fn, gg);
for (int i=1; i<16; i++) {
gg.SetAdd(gg, ad);
prec[j][i].SetJac(gg);
}
ad = prec[j][15];
}
fn.SetNeg(fn);
fin.SetJac(fn);
}
};
@@ -129,6 +145,16 @@ const ECMultConsts &GetECMultConsts() {
return ecmult_consts;
}
void ECMultBase(GroupElemJac &out, const Number &gn) {
Number n; n.SetNumber(gn);
const ECMultConsts &c = GetECMultConsts();
out.SetAffine(c.prec[0][n.ShiftLowBits(4)]);
for (int j=1; j<64; j++) {
out.SetAdd(out, c.prec[j][n.ShiftLowBits(4)]);
}
out.SetAdd(out, c.fin);
}
void ECMult(GroupElemJac &out, const GroupElemJac &a, const Number &an, const Number &gn) {
Number an1, an2;
Number gn1, gn2;