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-rw-r--r--crypto/dh/dh_backend.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/crypto/dh/dh_backend.c b/crypto/dh/dh_backend.c
index 97f5271a5a..aebb38d1c9 100644
--- a/crypto/dh/dh_backend.c
+++ b/crypto/dh/dh_backend.c
@@ -17,6 +17,7 @@
#include <openssl/core_names.h>
#include "internal/param_build_set.h"
#include "crypto/dh.h"
+#include "dh_local.h"
/*
* The intention with the "backend" source file is to offer backend functions
@@ -117,6 +118,49 @@ int ossl_dh_key_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
return 1;
}
+static ossl_inline int dh_bn_dup_check(BIGNUM **out, const BIGNUM *f)
+{
+ if (f != NULL && (*out = BN_dup(f)) == NULL)
+ return 0;
+ return 1;
+}
+
+DH *ossl_dh_dup(const DH *dh)
+{
+ DH *dupkey = NULL;
+
+#ifndef FIPS_MODULE
+ /* Do not try to duplicate foreign DH keys */
+ if (ossl_dh_get_method(dh) != DH_OpenSSL())
+ return NULL;
+#endif
+
+ if ((dupkey = ossl_dh_new_ex(dh->libctx)) == NULL)
+ return NULL;
+
+ dupkey->length = DH_get_length(dh);
+ if (!ossl_ffc_params_copy(&dupkey->params, &dh->params))
+ goto err;
+
+ dupkey->flags = dh->flags;
+
+ if (!dh_bn_dup_check(&dupkey->pub_key, dh->pub_key))
+ goto err;
+ if (!dh_bn_dup_check(&dupkey->priv_key, dh->priv_key))
+ goto err;
+
+#ifndef FIPS_MODULE
+ if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_DH,
+ &dupkey->ex_data, &dh->ex_data))
+ goto err;
+#endif
+
+ return dupkey;
+
+ err:
+ DH_free(dupkey);
+ return NULL;
+}
#ifndef FIPS_MODULE
DH *ossl_dh_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
OSSL_LIB_CTX *libctx, const char *propq)