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Get rid of variable-length hex string conversions

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This commit is contained in:
Pieter Wuille
2015-01-24 21:52:48 -04:00
parent e84e761915
commit 0768bd55a1
5 changed files with 36 additions and 64 deletions
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19
src/field_impl.h
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@@ -21,29 +21,23 @@
#error "Please select field implementation"
#endif
static void secp256k1_fe_get_hex(char *r, int *rlen, const secp256k1_fe_t *a) {
static void secp256k1_fe_get_hex(char *r64, const secp256k1_fe_t *a) {
secp256k1_fe_t b;
int i;
unsigned char tmp[32];
if (*rlen < 65) {
*rlen = 65;
return;
}
*rlen = 65;
b = *a;
secp256k1_fe_normalize(&b);
secp256k1_fe_get_b32(tmp, &b);
for (i=0; i<32; i++) {
static const char *c = "0123456789ABCDEF";
r[2*i] = c[(tmp[i] >> 4) & 0xF];
r[2*i+1] = c[(tmp[i]) & 0xF];
r64[2*i] = c[(tmp[i] >> 4) & 0xF];
r64[2*i+1] = c[(tmp[i]) & 0xF];
}
r[64] = 0x00;
}
static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a64) {
int i;
unsigned char tmp[32] = {0};
unsigned char tmp[32];
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,
@@ -61,8 +55,7 @@ static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen) {
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};
for (i=0; i<32; i++) {
if (alen > i*2)
tmp[32 - alen/2 + i] = (cvt[(unsigned char)a[2*i]] << 4) + cvt[(unsigned char)a[2*i+1]];
tmp[i] = (cvt[(unsigned char)a64[2*i]] << 4) + cvt[(unsigned char)a64[2*i+1]];
}
return secp256k1_fe_set_b32(r, tmp);
}