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-rw-r--r--crypto/ec/ec_asn1.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/crypto/ec/ec_asn1.c b/crypto/ec/ec_asn1.c
index 865130f67e64..30b3ebfbe0c1 100644
--- a/crypto/ec/ec_asn1.c
+++ b/crypto/ec/ec_asn1.c
@@ -973,6 +973,20 @@ static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
* 0x0 = OPENSSL_EC_EXPLICIT_CURVE
*/
EC_GROUP_set_asn1_flag(ret, 0x0);
+
+ /*
+ * If the input params do not contain the optional seed field we make
+ * sure it is not added to the returned group.
+ *
+ * The seed field is not really used inside libcrypto anyway, and
+ * adding it to parsed explicit parameter keys would alter their DER
+ * encoding output (because of the extra field) which could impact
+ * applications fingerprinting keys by their DER encoding.
+ */
+ if (params->curve->seed == NULL) {
+ if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
+ goto err;
+ }
}
ok = 1;