pbkdf1: 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/pbkdf1.c b/providers/implementations/kdfs/pbkdf1.c
index b9b164c4e2c1ad2db7925d8f0140c47bc5941750..986dd25ee399ead97c1f271cd7c813e1a34c3603 100644 (file)
--- a/providers/implementations/kdfs/pbkdf1.c
+++ b/providers/implementations/kdfs/pbkdf1.c
@@ -24,6 +24,7 @@
 #include "prov/provider_util.h"
 
 static OSSL_FUNC_kdf_newctx_fn kdf_pbkdf1_new;
+static OSSL_FUNC_kdf_dupctx_fn kdf_pbkdf1_dup;
 static OSSL_FUNC_kdf_freectx_fn kdf_pbkdf1_free;
 static OSSL_FUNC_kdf_reset_fn kdf_pbkdf1_reset;
 static OSSL_FUNC_kdf_derive_fn kdf_pbkdf1_derive;
@@ -130,6 +131,28 @@ static void kdf_pbkdf1_reset(void *vctx)
     ctx->provctx = provctx;
 }
 
+static void *kdf_pbkdf1_dup(void *vctx)
+{
+    const KDF_PBKDF1 *src = (const KDF_PBKDF1 *)vctx;
+    KDF_PBKDF1 *dest;
+
+    dest = kdf_pbkdf1_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;
+        dest->iter = src->iter;
+    }
+    return dest;
+
+ err:
+    kdf_pbkdf1_free(dest);
+    return NULL;
+}
+
 static int kdf_pbkdf1_set_membuf(unsigned char **buffer, size_t *buflen,
                              const OSSL_PARAM *p)
 {
@@ -231,6 +254,7 @@ static const OSSL_PARAM *kdf_pbkdf1_gettable_ctx_params(ossl_unused void *ctx,
 
 const OSSL_DISPATCH ossl_kdf_pbkdf1_functions[] = {
     { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pbkdf1_new },
+    { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pbkdf1_dup },
     { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pbkdf1_free },
     { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pbkdf1_reset },
     { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pbkdf1_derive },