Commit 7703de2772 for openssl.org

commit 7703de27725892036051082b28062be15130c9d9
Author: Dr. David von Oheimb <dev@ddvo.net>
Date:   Mon Jul 14 19:51:14 2025 +0200

    cmp_ctx_set_md(): on error, provide name of unsupported algorithm

    Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
    Reviewed-by: Paul Dale <paul.dale@oracle.com>
    MergeDate: Tue Mar 24 17:06:58 2026
    (Merged from https://github.com/openssl/openssl/pull/29074)

diff --git a/crypto/cmp/cmp_ctx.c b/crypto/cmp/cmp_ctx.c
index 28f9a77e8f..e3991d0e39 100644
--- a/crypto/cmp/cmp_ctx.c
+++ b/crypto/cmp/cmp_ctx.c
@@ -81,11 +81,18 @@ err:

 static int cmp_ctx_set_md(OSSL_CMP_CTX *ctx, EVP_MD **pmd, int nid)
 {
-    EVP_MD *md = EVP_MD_fetch(ctx->libctx, OBJ_nid2sn(nid), ctx->propq);
+    const char *name = OBJ_nid2sn(nid);
+    EVP_MD *md;
+
+    if (name == NULL) {
+        ERR_raise_data(ERR_LIB_CMP, CMP_R_UNKNOWN_ALGORITHM_ID, "nid=%d", nid);
+        return 0;
+    }
+    md = EVP_MD_fetch(ctx->libctx, name, ctx->propq);
     /* fetching in advance to be able to throw error early if unsupported */

     if (md == NULL) {
-        ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_ALGORITHM);
+        ERR_raise_data(ERR_LIB_CMP, CMP_R_UNSUPPORTED_ALGORITHM, "name=%s,nid=%d", name, nid);
         return 0;
     }
     EVP_MD_free(*pmd);