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bip32: drop ugly decitoa

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This commit is contained in:
Pavol Rusnak 2018-07-10 20:21:18 +02:00
parent 1730601d30
commit ff001a0f12
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GPG Key ID: 91F3B339B9A02A3D
1 changed files with 26 additions and 19 deletions
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bip32.c
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@ -364,15 +364,6 @@ int hdnode_private_ckd_cardano(HDNode *inout, uint32_t i)
return 1;
}
static void decitoa(int val, char *out) {
static char buf[32] = {0};
int i = 30;
for (; val && i; --i, val /= 10) {
buf[i] = "0123456789"[val % 10];
}
memcpy(out, &buf[i + 1], strlen(&buf[i + 1]) + 1);
}
int hdnode_from_seed_cardano(uint8_t *seed, int seed_len, HDNode *out) {
uint8_t hash[32];
uint8_t cbor[32+2];
@ -390,9 +381,8 @@ int hdnode_from_seed_cardano(uint8_t *seed, int seed_len, HDNode *out) {
cbor[0] = 88; // 64 means its byte array, 24 means its length has 8 bits
cbor[1] = 32; // length of the byte array
memcpy(cbor + 2, hash, 32);
char salt[21];
memcpy(salt, "Root Seed Chain xyzw", 16);
char c[21];
uint8_t salt[21];
memcpy(salt, "Root Seed Chain ", 16);
uint8_t hmac[64];
uint8_t secret[64];
uint8_t public[32];
@ -403,12 +393,30 @@ int hdnode_from_seed_cardano(uint8_t *seed, int seed_len, HDNode *out) {
out->child_num = 0;
out->curve = get_curve_by_name(ED25519_CARDANO_NAME);
int saltlen;
static CONFIDENTIAL HMAC_SHA512_CTX ctx;
for (int i = 1; i <= 1000; i++){
hmac_sha512_Init(&ctx, cbor, 34);
decitoa(i, c);
memcpy(salt + 16, c, strlen(c) + 1);
hmac_sha512_Update(&ctx, (unsigned char *)salt, strlen(salt));
if (i < 10) {
salt[16] = '0' + (i);
saltlen = 16 + 1;
} else if (i < 100) {
salt[16] = '0' + (i / 10);
salt[17] = '0' + (i % 10);
saltlen = 16 + 2;
} else if (i < 1000) {
salt[16] = '0' + (i / 100);
salt[17] = '0' + ((i / 10) % 10);
salt[18] = '0' + (i % 10);
saltlen = 16 + 3;
} else {
salt[16] = '0' + (i / 1000);
salt[17] = '0' + ((i / 100) % 10);
salt[18] = '0' + ((i / 10) % 10);
salt[19] = '0' + (i % 10);
saltlen = 16 + 4;
}
hmac_sha512_Update(&ctx, salt, saltlen);
hmac_sha512_Final(&ctx, hmac);
ed25519_publickey(hmac, public);
sha512_Raw(hmac, 32, secret);
@ -423,10 +431,9 @@ int hdnode_from_seed_cardano(uint8_t *seed, int seed_len, HDNode *out) {
break;
}
memzero(hash, 32);
memzero(cbor, 34);
memzero(salt, strlen(salt) + 1);
memzero(c, strlen(c) + 1);
memzero(hash, sizeof(hash));
memzero(cbor, sizeof(cbor));
memzero(salt, sizeof(salt));
if (failed) {
memzero(seed, sizeof(seed));