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Enhance crypto abstract API for DH

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The patch offers alternate implementations of some functions using the
abstract cryptographic API.

This work was done in preparation for the changes to allow hostap to be
compiled with the wolfSSL cryptography and TLS library.

Signed-off-by: Sean Parkinson <sean@wolfssl.com>
This commit is contained in:
Sean Parkinson 2017-10-16 15:45:09 +10:00 committed by Jouni Malinen
parent 0e02f2a9fa
commit c335507c8d
1 changed files with 13 additions and 24 deletions
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37
src/crypto/dh_groups.c
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@ -1203,19 +1203,6 @@ struct wpabuf * dh_init(const struct dh_group *dh, struct wpabuf **priv)
if (*priv == NULL)
return NULL;
if (random_get_bytes(wpabuf_put(*priv, dh->prime_len), dh->prime_len))
{
wpabuf_clear_free(*priv);
*priv = NULL;
return NULL;
}
if (os_memcmp(wpabuf_head(*priv), dh->prime, dh->prime_len) > 0) {
/* Make sure private value is smaller than prime */
*(wpabuf_mhead_u8(*priv)) = 0;
}
wpa_hexdump_buf_key(MSG_DEBUG, "DH: private value", *priv);
pv_len = dh->prime_len;
pv = wpabuf_alloc(pv_len);
if (pv == NULL) {
@ -1223,17 +1210,17 @@ struct wpabuf * dh_init(const struct dh_group *dh, struct wpabuf **priv)
*priv = NULL;
return NULL;
}
if (crypto_mod_exp(dh->generator, dh->generator_len,
wpabuf_head(*priv), wpabuf_len(*priv),
dh->prime, dh->prime_len, wpabuf_mhead(pv),
&pv_len) < 0) {
if (crypto_dh_init(*dh->generator, dh->prime, dh->prime_len,
wpabuf_mhead(*priv), wpabuf_mhead(pv)) < 0) {
wpabuf_clear_free(pv);
wpa_printf(MSG_INFO, "DH: crypto_mod_exp failed");
wpa_printf(MSG_INFO, "DH: crypto_dh_init failed");
wpabuf_clear_free(*priv);
*priv = NULL;
return NULL;
}
wpabuf_put(pv, pv_len);
wpabuf_put(*priv, dh->prime_len);
wpabuf_put(pv, dh->prime_len);
wpa_hexdump_buf_key(MSG_DEBUG, "DH: private value", *priv);
wpa_hexdump_buf(MSG_DEBUG, "DH: public value", pv);
return pv;
@ -1261,12 +1248,14 @@ struct wpabuf * dh_derive_shared(const struct wpabuf *peer_public,
shared = wpabuf_alloc(shared_len);
if (shared == NULL)
return NULL;
if (crypto_mod_exp(wpabuf_head(peer_public), wpabuf_len(peer_public),
wpabuf_head(own_private), wpabuf_len(own_private),
dh->prime, dh->prime_len,
wpabuf_mhead(shared), &shared_len) < 0) {
if (crypto_dh_derive_secret(*dh->generator, dh->prime, dh->prime_len,
wpabuf_head(own_private),
wpabuf_len(own_private),
wpabuf_head(peer_public),
wpabuf_len(peer_public),
wpabuf_mhead(shared), &shared_len) < 0) {
wpabuf_clear_free(shared);
wpa_printf(MSG_INFO, "DH: crypto_mod_exp failed");
wpa_printf(MSG_INFO, "DH: crypto_dh_derive_secret failed");
return NULL;
}
wpabuf_put(shared, shared_len);