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refactor make_credential

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This commit is contained in:
Conor Patrick
2018-05-12 12:19:31 -04:00
parent 9fcbcad735
commit f0768468f0
5 changed files with 118 additions and 82 deletions
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31
crypto.c
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@@ -25,7 +25,7 @@ const uint16_t attestation_key_size;
static SHA256_CTX sha256_ctx;
static const struct uECC_Curve_t * _es256_curve = NULL;
static uint8_t * _signing_key = NULL;
static const uint8_t * _signing_key = NULL;
// Secret for testing only
static uint8_t master_secret[32] = "\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff"
@@ -56,11 +56,6 @@ void crypto_ecc256_init()
_es256_curve = uECC_secp256r1();
}
void crypto_ecc256_load_key(uint8_t * rpId, int len1, uint8_t * entropy, int len2)
{
// TODO
}
void crypto_ecc256_load_attestation_key()
{
@@ -76,19 +71,24 @@ void crypto_ecc256_sign(uint8_t * data, int len, uint8_t * sig)
}
}
/*int uECC_compute_public_key(const uint8_t *private_key, uint8_t *public_key, uECC_Curve curve);*/
void crypto_derive_ecc256_public_key(uint8_t * rpId, int len1, uint8_t * entropy, int len2, uint8_t * x, uint8_t * y)
static void generate_private_key(uint8_t * rpId, int len1, uint8_t * entropy, int len2, uint8_t * privkey)
{
uint8_t privkey[32];
uint8_t pubkey[64];
// poor man's hmac
crypto_sha256_init();
crypto_sha256_update(rpId, len1);
crypto_sha256_update(entropy, len2);
crypto_sha256_update(master_secret, 32);
crypto_sha256_final(privkey);
}
/*int uECC_compute_public_key(const uint8_t *private_key, uint8_t *public_key, uECC_Curve curve);*/
void crypto_ecc256_derive_public_key(uint8_t * rpId, int len1, uint8_t * entropy, int len2, uint8_t * x, uint8_t * y)
{
uint8_t privkey[32];
uint8_t pubkey[64];
generate_private_key(rpId,len1,entropy,len2,privkey);
memset(pubkey,0,sizeof(pubkey));
uECC_compute_public_key(privkey, pubkey, _es256_curve);
@@ -96,6 +96,13 @@ void crypto_derive_ecc256_public_key(uint8_t * rpId, int len1, uint8_t * entropy
memmove(y,pubkey+32,32);
}
void crypto_ecc256_load_key(uint8_t * rpId, int len1, uint8_t * entropy, int len2)
{
static uint8_t privkey[32];
generate_private_key(rpId,len1,entropy,len2,privkey);
_signing_key = privkey;
}
const uint8_t attestation_cert_der[] =
"\x30\x82\x01\xfb\x30\x82\x01\xa1\xa0\x03\x02\x01\x02\x02\x01\x00\x30\x0a\x06\x08"