Support public key and param check in EVP interface

EVP_PKEY_public_check() and EVP_PKEY_param_check()

Doc and test cases are added

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4647)

1 files changed, 46 insertions, 0 deletions

diff --git a/crypto/evp/pmeth_gn.c b/crypto/evp/pmeth_gn.c
index 1a927a8320..e14965f333 100644
--- a/crypto/evp/pmeth_gn.c
+++ b/crypto/evp/pmeth_gn.c
@@ -191,3 +191,49 @@ int EVP_PKEY_check(EVP_PKEY_CTX *ctx)
 
     return pkey->ameth->pkey_check(pkey);
 }
+
+int EVP_PKEY_public_check(EVP_PKEY_CTX *ctx)
+{
+    EVP_PKEY *pkey = ctx->pkey;
+
+    if (pkey == NULL) {
+        EVPerr(EVP_F_EVP_PKEY_PUBLIC_CHECK, EVP_R_NO_KEY_SET);
+        return 0;
+    }
+
+    /* call customized public key check function first */
+    if (ctx->pmeth->public_check != NULL)
+        return ctx->pmeth->public_check(pkey);
+
+    /* use default public key check function in ameth */
+    if (pkey->ameth == NULL || pkey->ameth->pkey_public_check == NULL) {
+        EVPerr(EVP_F_EVP_PKEY_PUBLIC_CHECK,
+               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
+        return -2;
+    }
+
+    return pkey->ameth->pkey_public_check(pkey);
+}
+
+int EVP_PKEY_param_check(EVP_PKEY_CTX *ctx)
+{
+    EVP_PKEY *pkey = ctx->pkey;
+
+    if (pkey == NULL) {
+        EVPerr(EVP_F_EVP_PKEY_PARAM_CHECK, EVP_R_NO_KEY_SET);
+        return 0;
+    }
+
+    /* call customized param check function first */
+    if (ctx->pmeth->param_check != NULL)
+        return ctx->pmeth->param_check(pkey);
+
+    /* use default param check function in ameth */
+    if (pkey->ameth == NULL || pkey->ameth->pkey_param_check == NULL) {
+        EVPerr(EVP_F_EVP_PKEY_PARAM_CHECK,
+               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
+        return -2;
+    }
+
+    return pkey->ameth->pkey_param_check(pkey);
+}