highperfocused/bitcoin
1
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2026-01-21 07:39:08 +01:00
Code Issues Packages Projects Releases Wiki Activity

First step in converting to C: num

Browse Source
This commit is contained in:
Pieter Wuille
2013-03-24 10:38:35 +01:00
parent 21b74c7e5f
commit 4adf6b2a32
17 changed files with 508 additions and 472 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
ecmult.cpp
View File

@@ -61,29 +61,31 @@ private:
}
public:
WNAF(const Number &exp, int w) : used(0) {
WNAF(const secp256k1_num_t &exp, int w) : used(0) {
int zeroes = 0;
Number x;
x.SetNumber(exp);
secp256k1_num_t x;
secp256k1_num_init(&x);
secp256k1_num_copy(&x, &exp);
int sign = 1;
if (x.IsNeg()) {
if (secp256k1_num_is_neg(&x)) {
sign = -1;
x.Negate();
secp256k1_num_negate(&x);
}
while (!x.IsZero()) {
while (!x.IsOdd()) {
while (!secp256k1_num_is_zero(&x)) {
while (!secp256k1_num_is_odd(&x)) {
zeroes++;
x.Shift1();
secp256k1_num_shift(&x, 1);
}
int word = x.ShiftLowBits(w);
int word = secp256k1_num_shift(&x, w);
if (word & (1 << (w-1))) {
x.Inc();
secp256k1_num_inc(&x);
PushNAF(sign * (word - (1 << w)), zeroes);
} else {
PushNAF(sign * word, zeroes);
}
zeroes = w-1;
}
secp256k1_num_free(&x);
}
int GetSize() const {
@@ -145,19 +147,27 @@ const ECMultConsts &GetECMultConsts() {
return ecmult_consts;
}
void ECMultBase(GroupElemJac &out, const Number &gn) {
Number n; n.SetNumber(gn);
void ECMultBase(GroupElemJac &out, const secp256k1_num_t &gn) {
secp256k1_num_t n;
secp256k1_num_init(&n);
secp256k1_num_copy(&n, &gn);
const ECMultConsts &c = GetECMultConsts();
out.SetAffine(c.prec[0][n.ShiftLowBits(4)]);
out.SetAffine(c.prec[0][secp256k1_num_shift(&n, 4)]);
for (int j=1; j<64; j++) {
out.SetAdd(out, c.prec[j][n.ShiftLowBits(4)]);
out.SetAdd(out, c.prec[j][secp256k1_num_shift(&n, 4)]);
}
secp256k1_num_free(&n);
out.SetAdd(out, c.fin);
}
void ECMult(GroupElemJac &out, const GroupElemJac &a, const Number &an, const Number &gn) {
Number an1, an2;
Number gn1, gn2;
void ECMult(GroupElemJac &out, const GroupElemJac &a, const secp256k1_num_t &an, const secp256k1_num_t &gn) {
secp256k1_num_t an1, an2;
secp256k1_num_t gn1, gn2;
secp256k1_num_init(&an1);
secp256k1_num_init(&an2);
secp256k1_num_init(&gn1);
secp256k1_num_init(&gn2);
SplitExp(an, an1, an2);
// printf("an=%s\n", an.ToString().c_str());
@@ -165,7 +175,7 @@ void ECMult(GroupElemJac &out, const GroupElemJac &a, const Number &an, const Nu
// printf("an2=%s\n", an2.ToString().c_str());
// printf("an1.len=%i\n", an1.GetBits());
// printf("an2.len=%i\n", an2.GetBits());
gn.SplitInto(128, gn1, gn2);
secp256k1_num_split(&gn1, &gn2, &gn, 128);
WNAF<128> wa1(an1, WINDOW_A);
WNAF<128> wa2(an2, WINDOW_A);
@@ -206,6 +216,11 @@ void ECMult(GroupElemJac &out, const GroupElemJac &a, const Number &an, const Nu
out.SetAdd(out, tmpa);
}
}
secp256k1_num_free(&an1);
secp256k1_num_free(&an2);
secp256k1_num_free(&gn1);
secp256k1_num_free(&gn2);
}
}