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DPP2: Add challengePassword into CSR

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Derive challengePassword from bk and add it into the CSR.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-06-17 12:22:08 +03:00 • committed by Jouni Malinen
parent dbbb0d5b82
commit c98db9f1f8
2 changed files with 25 additions and 0 deletions
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1
src/common/dpp.h
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@ -120,6 +120,7 @@ enum dpp_connector_key {
#define DPP_MAX_NONCE_LEN 32
#define DPP_MAX_HASH_LEN 64
#define DPP_MAX_SHARED_SECRET_LEN 66
#define DPP_CP_LEN 64
struct dpp_curve_params {
const char *name;

24
src/common/dpp_crypto.c
View file

@ -2677,6 +2677,10 @@ struct wpabuf * dpp_build_csr(struct dpp_authentication *auth)
unsigned int hash_len = auth->curve->hash_len;
EC_KEY *eckey;
BIO *out = NULL;
u8 cp[DPP_CP_LEN];
char *password;
size_t password_len;
int res;
/* TODO: use auth->csrattrs */
@ -2701,6 +2705,26 @@ struct wpabuf * dpp_build_csr(struct dpp_authentication *auth)
if (!req || !X509_REQ_set_pubkey(req, key))
goto fail;
/* cp = HKDF-Expand(bk, "CSR challengePassword", 64) */
if (dpp_hkdf_expand(hash_len, auth->bk, hash_len,
"CSR challengePassword", cp, DPP_CP_LEN) < 0)
goto fail;
wpa_hexdump_key(MSG_DEBUG,
"DPP: cp = HKDF-Expand(bk, \"CSR challengePassword\", 64)",
cp, DPP_CP_LEN);
password = base64_encode_no_lf(cp, DPP_CP_LEN, &password_len);
forced_memzero(cp, DPP_CP_LEN);
if (!password)
goto fail;
res = X509_REQ_add1_attr_by_NID(req, NID_pkcs9_challengePassword,
V_ASN1_UTF8STRING,
(const unsigned char *) password,
password_len);
bin_clear_free(password, password_len);
if (!res)
goto fail;
/* TODO */
/* TODO: hash func selection based on csrAttrs */