Relocate ECParameters_dup() to ec_asn1

jsing rightly points out that this has nothing to do with ASN.1, but
ec_lib.c has no EC_KEY knowledge otherwise (it's about groups and points)
and moving it to ec_key.c is also not satisfactory since the weird
d2i/i2d for ECParameters don't belong there either.

no objection from jsing

1 files changed, 23 insertions, 1 deletions

diff --git a/src/lib/libcrypto/ec/ec_asn1.c b/src/lib/libcrypto/ec/ec_asn1.c
index 006ad7662a..ed7bae16b9 100644
--- a/src/lib/libcrypto/ec/ec_asn1.c
+++ b/src/lib/libcrypto/ec/ec_asn1.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_asn1.c,v 1.105 2024/11/02 19:21:24 tb Exp $ */
+/* $OpenBSD: ec_asn1.c,v 1.106 2024/11/08 13:55:45 tb Exp $ */
 /*
  * Written by Nils Larsch for the OpenSSL project.
  */
@@ -1403,6 +1403,28 @@ d2i_ECParameters(EC_KEY **out_ec_key, const unsigned char **in, long len)
 LCRYPTO_ALIAS(d2i_ECParameters);
 
 EC_KEY *
+ECParameters_dup(EC_KEY *key)
+{
+        const unsigned char *p;
+        unsigned char *der = NULL;
+        EC_KEY *dup = NULL;
+        int len;
+
+        if (key == NULL)
+                return NULL;
+
+        if ((len = i2d_ECParameters(key, &der)) <= 0)
+                return NULL;
+
+        p = der;
+        dup = d2i_ECParameters(NULL, &p, len);
+        freezero(der, len);
+
+        return dup;
+}
+LCRYPTO_ALIAS(ECParameters_dup);
+
+EC_KEY *
 o2i_ECPublicKey(EC_KEY **in_ec_key, const unsigned char **in, long len)
 {
         EC_KEY *ec_key = NULL;