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Code Issues Releases Wiki Activity

introduce cryptoMultisigFingerprint

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This commit is contained in:
Pavol Rusnak 2014-12-16 18:56:44 +01:00
parent 4122b56e1c
commit cce9d783a6
2 changed files with 42 additions and 0 deletions
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41
firmware/crypto.c
View File

@ -280,3 +280,44 @@ int cryptoMultisigPubkeyIndex(const MultisigRedeemScriptType *multisig, const ui
}
return -1;
}
int cryptoMultisigFingerprint(const MultisigRedeemScriptType *multisig, uint8_t *hash)
{
const uint32_t n = multisig->pubkeys_count;
const int max_pubkeys = pb_arraysize(MultisigRedeemScriptType, pubkeys);
uint8_t order[max_pubkeys], swap;
uint32_t i, j;
const HDNodeType *a, *b;
// check sanity
for (i = 0; i < n; i++) {
order[i] = i;
a = &(multisig->pubkeys[i].node);
if (!a->has_public_key || a->public_key.size != 33) return 0;
if (a->chain_code.size != 32) return 0;
}
// (bubble) sort according to pubkey
for (i = 0; i < n; i++) {
for (j = i; j < n; j++) {
a = &(multisig->pubkeys[order[i]].node);
b = &(multisig->pubkeys[order[j]].node);
if (memcmp(a->public_key.bytes, b->public_key.bytes, 33) > 0) {
swap = order[i];
order[i] = order[j];
order[j] = swap;
}
}
}
// hash sorted nodes
SHA256_CTX ctx;
sha256_Init(&ctx);
for (i = 0; i < n; i++) {
a = &(multisig->pubkeys[order[i]].node);
sha256_Update(&ctx, (const uint8_t *)a->depth, sizeof(uint32_t));
sha256_Update(&ctx, (const uint8_t *)a->fingerprint, sizeof(uint32_t));
sha256_Update(&ctx, (const uint8_t *)a->child_num, sizeof(uint32_t));
sha256_Update(&ctx, a->chain_code.bytes, 32);
sha256_Update(&ctx, a->public_key.bytes, 33);
}
sha256_Final(hash, &ctx);
return 1;
}

1
firmware/crypto.h
View File

@ -43,5 +43,6 @@ uint8_t *cryptoHDNodePathToPubkey(const HDNodePathType *hdnodepath);
int cryptoMultisigPubkeyIndex(const MultisigRedeemScriptType *multisig, const uint8_t *pubkey);
int cryptoMultisigFingerprint(const MultisigRedeemScriptType *multisig, uint8_t *hash);
#endif