pvk kdf: implement ctx dup operation

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/17572)

diff --git a/providers/implementations/kdfs/pvkkdf.c b/providers/implementations/kdfs/pvkkdf.c
index e953911c836b2d5f810d50e5362c29d4779b10a4..e96ff29b3b3668cba1af9015119c577b555a9299 100644 (file)
--- a/providers/implementations/kdfs/pvkkdf.c
+++ b/providers/implementations/kdfs/pvkkdf.c
@@ -17,6 +17,7 @@
 #include "prov/provider_util.h"
 
 static OSSL_FUNC_kdf_newctx_fn kdf_pvk_new;
+static OSSL_FUNC_kdf_dupctx_fn kdf_pvk_dup;
 static OSSL_FUNC_kdf_freectx_fn kdf_pvk_free;
 static OSSL_FUNC_kdf_reset_fn kdf_pvk_reset;
 static OSSL_FUNC_kdf_derive_fn kdf_pvk_derive;
@@ -71,6 +72,26 @@ static void kdf_pvk_free(void *vctx)
     }
 }
 
+static void *kdf_pvk_dup(void *vctx)
+{
+    const KDF_PVK *src = (const KDF_PVK *)vctx;
+    KDF_PVK *dest;
+
+    dest = kdf_pvk_new(src->provctx);
+    if (dest != NULL)
+        if (!ossl_prov_memdup(src->salt, src->salt_len,
+                              &dest->salt, &dest->salt_len)
+                || !ossl_prov_memdup(src->pass, src->pass_len,
+                                     &dest->pass , &dest->pass_len)
+                || !ossl_prov_digest_copy(&dest->digest, &src->digest))
+            goto err;
+    return dest;
+
+ err:
+    kdf_pvk_free(dest);
+    return NULL;
+}
+
 static void kdf_pvk_reset(void *vctx)
 {
     KDF_PVK *ctx = (KDF_PVK *)vctx;
@@ -216,6 +237,7 @@ static const OSSL_PARAM *kdf_pvk_gettable_ctx_params(ossl_unused void *ctx,
 
 const OSSL_DISPATCH ossl_kdf_pvk_functions[] = {
     { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pvk_new },
+    { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pvk_dup },
     { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pvk_free },
     { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pvk_reset },
     { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pvk_derive },