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Added key derivation for large blob.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-12-07 17:07:16 +01:00
parent d7016f6065
commit 860cca53e0
1 changed files with 14 additions and 0 deletions
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14
src/fido/credential.c
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@@ -321,3 +321,17 @@ int credential_derive_chacha_key(uint8_t *outk) {
mbedtls_md_hmac(md_info, outk, 32, (uint8_t *)"Encryption key", 14, outk);
return 0;
}
int credential_derive_large_blob_key(const uint8_t *cred_id, size_t cred_id_len, uint8_t *outk) {
memset(outk, 0, 32);
int r = 0;
if ((r = load_keydev(outk)) != 0)
return r;
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
mbedtls_md_hmac(md_info, outk, 32, (uint8_t *)"SLIP-0022", 9, outk);
mbedtls_md_hmac(md_info, outk, 32, (uint8_t *)CRED_PROTO, 4, outk);
mbedtls_md_hmac(md_info, outk, 32, (uint8_t *)"largeBlobKey", 12, outk);
mbedtls_md_hmac(md_info, outk, 32, cred_id, cred_id_len, outk);
return 0;
}