Parameter copy sanity checks.
Don't copy parameters is they're already present in the destination.
Return error if an attempt is made to copy different parameters to
destination. Update documentation.
If key type is not initialised return missing parameters
RT#4149
Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/crypto/evp/p_lib.c b/crypto/evp/p_lib.c
index 0b7884f..0b50d32 100644
--- a/crypto/evp/p_lib.c
+++ b/crypto/evp/p_lib.c
@@ -84,6 +84,14 @@
EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);
goto err;
}
+
+ if (!EVP_PKEY_missing_parameters(to)) {
+ if (EVP_PKEY_cmp_parameters(to, from) == 1)
+ return 1;
+ EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_PARAMETERS);
+ return 0;
+ }
+
if (from->ameth && from->ameth->param_copy)
return from->ameth->param_copy(to, from);
err:
