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wolfSSL: Add crypto_ecdh_*()

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Implement the wrapper functions for ECDH operations.

Signed-off-by: Sean Parkinson <sean@wolfssl.com>
This commit is contained in:
Sean Parkinson 2018-03-29 14:55:55 +10:00 committed by Jouni Malinen
parent 3d2f638d61
commit 187ad3a303
1 changed files with 125 additions and 0 deletions
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125
src/crypto/crypto_wolfssl.c
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@ -1667,4 +1667,129 @@ int crypto_ec_point_cmp(const struct crypto_ec *e,
return wc_ecc_cmp_point((ecc_point *) a, (ecc_point *) b);
}
struct crypto_ecdh {
struct crypto_ec *ec;
};
struct crypto_ecdh * crypto_ecdh_init(int group)
{
struct crypto_ecdh *ecdh = NULL;
WC_RNG rng;
int ret;
if (wc_InitRng(&rng) != 0)
goto fail;
ecdh = os_zalloc(sizeof(*ecdh));
if (!ecdh)
goto fail;
ecdh->ec = crypto_ec_init(group);
if (!ecdh->ec)
goto fail;
ret = wc_ecc_make_key_ex(&rng, ecdh->ec->key.dp->size, &ecdh->ec->key,
ecdh->ec->key.dp->id);
if (ret < 0)
goto fail;
done:
wc_FreeRng(&rng);
return ecdh;
fail:
crypto_ecdh_deinit(ecdh);
ecdh = NULL;
goto done;
}
void crypto_ecdh_deinit(struct crypto_ecdh *ecdh)
{
if (ecdh) {
crypto_ec_deinit(ecdh->ec);
os_free(ecdh);
}
}
struct wpabuf * crypto_ecdh_get_pubkey(struct crypto_ecdh *ecdh, int inc_y)
{
struct wpabuf *buf = NULL;
int ret;
int len = ecdh->ec->key.dp->size;
buf = wpabuf_alloc(inc_y ? 2 * len : len);
if (!buf)
goto fail;
ret = crypto_bignum_to_bin((struct crypto_bignum *)
ecdh->ec->key.pubkey.x, wpabuf_put(buf, len),
len, len);
if (ret < 0)
goto fail;
if (inc_y) {
ret = crypto_bignum_to_bin((struct crypto_bignum *)
ecdh->ec->key.pubkey.y,
wpabuf_put(buf, len), len, len);
if (ret < 0)
goto fail;
}
done:
return buf;
fail:
wpabuf_free(buf);
buf = NULL;
goto done;
}
struct wpabuf * crypto_ecdh_set_peerkey(struct crypto_ecdh *ecdh, int inc_y,
const u8 *key, size_t len)
{
int ret;
struct wpabuf *pubkey = NULL;
struct wpabuf *secret = NULL;
word32 key_len = ecdh->ec->key.dp->size;
ecc_point *point = NULL;
size_t need_key_len = inc_y ? 2 * key_len : key_len;
if (len < need_key_len)
goto fail;
pubkey = wpabuf_alloc(1 + 2 * key_len);
if (!pubkey)
goto fail;
wpabuf_put_u8(pubkey, inc_y ? ECC_POINT_UNCOMP : ECC_POINT_COMP_EVEN);
wpabuf_put_data(pubkey, key, need_key_len);
point = wc_ecc_new_point();
if (!point)
goto fail;
ret = wc_ecc_import_point_der(wpabuf_mhead(pubkey), 1 + 2 * key_len,
ecdh->ec->key.dp->id, point);
if (ret != MP_OKAY)
goto fail;
secret = wpabuf_alloc(key_len);
if (!secret)
goto fail;
ret = wc_ecc_shared_secret_ex(&ecdh->ec->key, point,
wpabuf_put(secret, key_len), &key_len);
if (ret != MP_OKAY)
goto fail;
done:
wc_ecc_del_point(point);
wpabuf_free(pubkey);
return secret;
fail:
wpabuf_free(secret);
secret = NULL;
goto done;
}
#endif /* CONFIG_ECC */