Fix EVP_DigestSign interface when used with DES CMAC

DES implementations were missing the dup/copy ctx routines
required by CMAC implementation. A regression test is added.

Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11498)

1 files changed, 14 insertions, 0 deletions

diff --git a/providers/implementations/ciphers/cipher_tdes_common.c b/providers/implementations/ciphers/cipher_tdes_common.c
index 36a8962e03..4e50450e4d 100644
--- a/providers/implementations/ciphers/cipher_tdes_common.c
+++ b/providers/implementations/ciphers/cipher_tdes_common.c
@@ -30,6 +30,20 @@ void *tdes_newctx(void *provctx, int mode, size_t kbits, size_t blkbits,
     return tctx;
 }
 
+void *tdes_dupctx(void *ctx)
+{
+    PROV_TDES_CTX *in = (PROV_TDES_CTX *)ctx;
+    PROV_TDES_CTX *ret = OPENSSL_malloc(sizeof(*ret));
+
+    if (ret == NULL) {
+        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+    in->base.hw->copyctx(&ret->base, &in->base);
+
+    return ret;
+}
+
 void tdes_freectx(void *vctx)
 {
     PROV_TDES_CTX *ctx = (PROV_TDES_CTX *)vctx;