1 files changed, 104 insertions, 0 deletions
diff --git a/providers/implementations/encode_decode/endecoder_common.c b/providers/implementations/encode_decode/endecoder_common.c
new file mode 100644
index 000000000000..c4ea2f853cfc
--- /dev/null
+++ b/providers/implementations/encode_decode/endecoder_common.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/core.h>
+#include <openssl/buffer.h>
+#include "internal/asn1.h"
+#include "prov/bio.h"
+#include "endecoder_local.h"
+
+OSSL_FUNC_keymgmt_new_fn *
+ossl_prov_get_keymgmt_new(const OSSL_DISPATCH *fns)
+{
+    /* Pilfer the keymgmt dispatch table */
+    for (; fns->function_id != 0; fns++)
+        if (fns->function_id == OSSL_FUNC_KEYMGMT_NEW)
+            return OSSL_FUNC_keymgmt_new(fns);
+
+    return NULL;
+}
+
+OSSL_FUNC_keymgmt_free_fn *
+ossl_prov_get_keymgmt_free(const OSSL_DISPATCH *fns)
+{
+    /* Pilfer the keymgmt dispatch table */
+    for (; fns->function_id != 0; fns++)
+        if (fns->function_id == OSSL_FUNC_KEYMGMT_FREE)
+            return OSSL_FUNC_keymgmt_free(fns);
+
+    return NULL;
+}
+
+OSSL_FUNC_keymgmt_import_fn *
+ossl_prov_get_keymgmt_import(const OSSL_DISPATCH *fns)
+{
+    /* Pilfer the keymgmt dispatch table */
+    for (; fns->function_id != 0; fns++)
+        if (fns->function_id == OSSL_FUNC_KEYMGMT_IMPORT)
+            return OSSL_FUNC_keymgmt_import(fns);
+
+    return NULL;
+}
+
+OSSL_FUNC_keymgmt_export_fn *
+ossl_prov_get_keymgmt_export(const OSSL_DISPATCH *fns)
+{
+    /* Pilfer the keymgmt dispatch table */
+    for (; fns->function_id != 0; fns++)
+        if (fns->function_id == OSSL_FUNC_KEYMGMT_EXPORT)
+            return OSSL_FUNC_keymgmt_export(fns);
+
+    return NULL;
+}
+
+void *ossl_prov_import_key(const OSSL_DISPATCH *fns, void *provctx,
+                           int selection, const OSSL_PARAM params[])
+{
+    OSSL_FUNC_keymgmt_new_fn *kmgmt_new = ossl_prov_get_keymgmt_new(fns);
+    OSSL_FUNC_keymgmt_free_fn *kmgmt_free = ossl_prov_get_keymgmt_free(fns);
+    OSSL_FUNC_keymgmt_import_fn *kmgmt_import =
+        ossl_prov_get_keymgmt_import(fns);
+    void *key = NULL;
+
+    if (kmgmt_new != NULL && kmgmt_import != NULL && kmgmt_free != NULL) {
+        if ((key = kmgmt_new(provctx)) == NULL
+            || !kmgmt_import(key, selection, params)) {
+            kmgmt_free(key);
+            key = NULL;
+        }
+    }
+    return key;
+}
+
+void ossl_prov_free_key(const OSSL_DISPATCH *fns, void *key)
+{
+    OSSL_FUNC_keymgmt_free_fn *kmgmt_free = ossl_prov_get_keymgmt_free(fns);
+
+    if (kmgmt_free != NULL)
+        kmgmt_free(key);
+}
+
+int ossl_read_der(PROV_CTX *provctx, OSSL_CORE_BIO *cin,  unsigned char **data,
+                  long *len)
+{
+    BUF_MEM *mem = NULL;
+    BIO *in = ossl_bio_new_from_core_bio(provctx, cin);
+    int ok;
+
+    if (in == NULL)
+        return 0;
+    ok = (asn1_d2i_read_bio(in, &mem) >= 0);
+    if (ok) {
+        *data = (unsigned char *)mem->data;
+        *len = (long)mem->length;
+        OPENSSL_free(mem);
+    }
+    BIO_free(in);
+    return ok;
+}