frost/secp256k1-zkp
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Some comments explaining some of the constants in the code.

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Gregory Maxwell
2015-02-02 01:47:23 +00:00
parent f88343f2eb
commit 6efd6e7777
7 changed files with 32 additions and 0 deletions
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3
src/field_impl.h
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@@ -29,6 +29,7 @@ static void secp256k1_fe_get_hex(char *r64, const secp256k1_fe_t *a) {
secp256k1_fe_normalize(&b);
secp256k1_fe_get_b32(tmp, &b);
for (i=0; i<32; i++) {
/* Hex character table. */
static const char *c = "0123456789ABCDEF";
r64[2*i] = c[(tmp[i] >> 4) & 0xF];
r64[2*i+1] = c[(tmp[i]) & 0xF];
@@ -38,6 +39,7 @@ static void secp256k1_fe_get_hex(char *r64, const secp256k1_fe_t *a) {
static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a64) {
int i;
unsigned char tmp[32];
/* Byte to hex value table. */
static const int cvt[256] = {0, 0, 0, 0, 0, 0, 0,0,0,0,0,0,0,0,0,0,
0, 0, 0, 0, 0, 0, 0,0,0,0,0,0,0,0,0,0,
0, 0, 0, 0, 0, 0, 0,0,0,0,0,0,0,0,0,0,
@@ -203,6 +205,7 @@ static void secp256k1_fe_inv_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
secp256k1_fe_inv(r, a);
#elif defined(USE_FIELD_INV_NUM)
secp256k1_num_t n, m;
/* secp256k1 field prime, value p defined in "Standards for Efficient Cryptography" (SEC2) 2.7.1. */
static const unsigned char prime[32] = {
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,