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OpenSSL: Fix compressed form encoding for subjectPublicKey with 3.0

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It looks like EC_KEY_set_conv_form() for the EC_KEY within the EVP_PKEY
does not take effect for i2d_PUBKEY() with OpenSSL 3.0, so allocate a
new wrapper EVP_PKEY after the conversion format change to be able to
return the correctly encoded (compressed) value here. This is required
for DPP to work correctly.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
This commit is contained in:
Jouni Malinen 2022-01-11 14:00:43 +02:00 committed by Jouni Malinen
parent ff2eccbdf9
commit 682fce579f
1 changed files with 17 additions and 0 deletions
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17
src/crypto/crypto_openssl.c
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@ -2619,6 +2619,9 @@ fail:
int der_len;
struct wpabuf *buf;
EC_KEY *eckey;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
EVP_PKEY *tmp;
#endif /* OpenSSL version >= 3.0 */
eckey = EVP_PKEY_get1_EC_KEY((EVP_PKEY *) key);
if (!eckey)
@ -2627,8 +2630,22 @@ fail:
/* For now, all users expect COMPRESSED form */
EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
tmp = EVP_PKEY_new();
if (!tmp)
return NULL;
if (EVP_PKEY_set1_EC_KEY(tmp, eckey) != 1) {
EVP_PKEY_free(tmp);
return NULL;
}
key = (struct crypto_ec_key *) tmp;
#endif /* OpenSSL version >= 3.0 */
der_len = i2d_PUBKEY((EVP_PKEY *) key, &der);
EC_KEY_free(eckey);
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
EVP_PKEY_free(tmp);
#endif /* OpenSSL version >= 3.0 */
if (der_len <= 0) {
wpa_printf(MSG_INFO, "OpenSSL: i2d_PUBKEY() failed: %s",
ERR_error_string(ERR_get_error(), NULL));