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secp256k1
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fix tests

This commit is contained in:
Pieter Wuille 2013-03-10 21:41:54 +01:00
parent a41f32e69d
commit 14b195ee65
3 changed files with 24 additions and 8 deletions
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4
num.h
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@ -1,7 +1,7 @@
#ifndef _SECP256K1_NUM_
#define _SECP256K1_NUM_
#include "num_gmp.h"
// #include "num_openssl.h"
// #include "num_gmp.h"
#include "num_openssl.h"
#endif

2
num_openssl.h
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@ -95,7 +95,7 @@ public:
BN_div(bn, NULL, a1.bn, a2.bn, ctx);
}
void SetMod(Context &ctx, const Number &a, const Number &m) {
BN_nnmod(bn, m.bn, a.bn, ctx);
BN_nnmod(bn, a.bn, m.bn, ctx);
}
int Compare(const Number &a) const {
return BN_cmp(bn, a.bn);

26
tests.cpp
View File

@ -13,18 +13,34 @@ void test_ecmult() {
FieldElem ax; ax.SetHex("8b30bbe9ae2a990696b22f670709dff3727fd8bc04d3362c6c7bf458e2846004");
FieldElem ay; ay.SetHex("a357ae915c4a65281309edf20504740f0eb3343990216b4f81063cb65f2f7e0f");
GroupElemJac a(ax,ay);
Number an(ctx); an.SetHex("84cc5452f7fde1edb4d38a8ce9b1b84ccef31f146e569be9705d357a42985407");
Number xn(ctx); xn.SetHex("84cc5452f7fde1edb4d38a8ce9b1b84ccef31f146e569be9705d357a42985407");
Number gn(ctx); gn.SetHex("a1e58d22553dcd42b23980625d4c57a96e9323d42b3152e5ca2c3990edc7c9de");
Number af(ctx); af.SetHex("1337");
Number xf(ctx); xf.SetHex("1337");
Number gf(ctx); gf.SetHex("7113");
Number ae(ctx); ae.SetHex("01");
Number ge(ctx); ge.SetHex("00");
GroupElemJac x = a;
const Number &order = GetGroupConst().order;
for (int i=0; i<1000; i++) {
ECMult(ctx, a, a, an, gn);
an.SetModMul(ctx, an, af, order);
// in each iteration, compute X = xn*X + gn*G;
ECMult(ctx, x, x, xn, gn);
// also compute ae and ge: the actual accumulated factors for A and G
// if X was (ae*A+ge*G), xn*X + gn*G results in (xn*ae*A + (xn*ge+gn)*G)
ae.SetModMul(ctx, ae, xn, order);
ge.SetModMul(ctx, ge, xn, order);
ge.SetAdd(ctx, ge, gn);
ge.SetMod(ctx, ge, order);
// modify xn and gn
xn.SetModMul(ctx, xn, xf, order);
gn.SetModMul(ctx, gn, gf, order);
}
std::string res = a.ToString();
std::string res = x.ToString();
assert(res == "(D37F97BBF58B4ECA238329D272C9AF0194F062B851EDF9B40F2294FA00BBFCA2,B127748E9A9F347257051588D44A1B822CA731833B2653AA3646C59A8ADAF295)");
// redo the computation, but directly with the resulting ae and ge coefficients:
GroupElemJac x2; ECMult(ctx, x2, a, ae, ge);
std::string res2 = x2.ToString();
printf("res=%s res2=%s\n", res.c_str(), res2.c_str());
assert(res == res2);
}