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wrong order

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Conor Patrick 2018-05-24 21:29:44 -04:00
parent 10e50bea48
commit d9c5bf2ea1
1 changed files with 3 additions and 4 deletions
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7
ctap.c
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@ -354,11 +354,7 @@ int ctap_calculate_signature(uint8_t * data, int datalen, uint8_t * clientDataHa
printf1(TAG_GREEN, "sha256: "); dump_hex1(TAG_DUMP,hashbuf,32); printf1(TAG_GREEN, "sha256: "); dump_hex1(TAG_DUMP,hashbuf,32);
crypto_ecc256_sign(hashbuf, 32, sigbuf); crypto_ecc256_sign(hashbuf, 32, sigbuf);
// Need to caress into dumb der format .. // Need to caress into dumb der format ..
int8_t pad_s = ((sigbuf[32 + lead_s] & 0x80) == 0x80); // Is MSBit a 1?
int8_t pad_r = ((sigbuf[0 + lead_r] & 0x80) == 0x80);
int8_t lead_s = 0; // leading zeros int8_t lead_s = 0; // leading zeros
int8_t lead_r = 0; int8_t lead_r = 0;
for (i=0; i < 32; i++) for (i=0; i < 32; i++)
@ -369,6 +365,9 @@ int ctap_calculate_signature(uint8_t * data, int datalen, uint8_t * clientDataHa
if (sigbuf[i+32] == 0) lead_s++; if (sigbuf[i+32] == 0) lead_s++;
else break; else break;
int8_t pad_s = ((sigbuf[32 + lead_s] & 0x80) == 0x80);
int8_t pad_r = ((sigbuf[0 + lead_r] & 0x80) == 0x80);
sigder[0] = 0x30; sigder[0] = 0x30;
sigder[1] = 0x44 + pad_s + pad_r - lead_s - lead_r; sigder[1] = 0x44 + pad_s + pad_r - lead_s - lead_r;