From a3ff845a1481ee4faf1bb0c38e29d70d3dd1aa45 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Wed, 31 Jul 2024 01:27:08 +0800
Subject: [PATCH] c/openssl: rand

---
 _cmptest/_randcrypt/rand.go                | 18 +++++
 {_demo => c/openssl/_demo}/cmd5demo/md5.go |  0
 c/openssl/_demo/cranddemo/rand.go          | 17 +++++
 {_demo => c/openssl/_demo}/cshademo/sha.go |  0
 c/openssl/openssl.go                       |  2 +
 c/openssl/rand.go                          | 80 ++++++++++++++++++++++
 6 files changed, 117 insertions(+)
 create mode 100644 _cmptest/_randcrypt/rand.go
 rename {_demo => c/openssl/_demo}/cmd5demo/md5.go (100%)
 create mode 100644 c/openssl/_demo/cranddemo/rand.go
 rename {_demo => c/openssl/_demo}/cshademo/sha.go (100%)
 create mode 100644 c/openssl/rand.go

diff --git a/_cmptest/_randcrypt/rand.go b/_cmptest/_randcrypt/rand.go
new file mode 100644
index 00000000..c8d52e63
--- /dev/null
+++ b/_cmptest/_randcrypt/rand.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"crypto/rand"
+	"fmt"
+)
+
+func main() {
+	c := 10
+	b := make([]byte, c)
+	_, err := rand.Read(b)
+	if err != nil {
+		fmt.Println("error:", err)
+		return
+	}
+	// The slice should now contain random bytes instead of only zeroes.
+	fmt.Printf("%x\n", b)
+}
diff --git a/_demo/cmd5demo/md5.go b/c/openssl/_demo/cmd5demo/md5.go
similarity index 100%
rename from _demo/cmd5demo/md5.go
rename to c/openssl/_demo/cmd5demo/md5.go
diff --git a/c/openssl/_demo/cranddemo/rand.go b/c/openssl/_demo/cranddemo/rand.go
new file mode 100644
index 00000000..4fc3a803
--- /dev/null
+++ b/c/openssl/_demo/cranddemo/rand.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/goplus/llgo/c/openssl"
+)
+
+func main() {
+	b := make([]byte, 10)
+
+	openssl.RANDBytes(b)
+	fmt.Printf("%x\n", b)
+
+	openssl.RANDPrivBytes(b)
+	fmt.Printf("%x\n", b)
+}
diff --git a/_demo/cshademo/sha.go b/c/openssl/_demo/cshademo/sha.go
similarity index 100%
rename from _demo/cshademo/sha.go
rename to c/openssl/_demo/cshademo/sha.go
diff --git a/c/openssl/openssl.go b/c/openssl/openssl.go
index cde02ca5..491f61fe 100644
--- a/c/openssl/openssl.go
+++ b/c/openssl/openssl.go
@@ -16,6 +16,8 @@
 
 package openssl
 
+// -----------------------------------------------------------------------------
+
 const (
 	LLGoPackage = "link: $(pkg-config --libs openssl); -lssl -lcrypto"
 )
diff --git a/c/openssl/rand.go b/c/openssl/rand.go
new file mode 100644
index 00000000..f9ad6338
--- /dev/null
+++ b/c/openssl/rand.go
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package openssl
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+)
+
+// -----------------------------------------------------------------------------
+
+// int RAND_bytes(unsigned char *buf, int num);
+//
+//go:linkname RANDBufferWithLen C.RAND_bytes
+func RANDBufferWithLen(buf *byte, num c.Int) c.Int
+
+func RANDBytes(buf []byte) c.Int {
+	return RANDBufferWithLen(unsafe.SliceData(buf), c.Int(len(buf)))
+}
+
+// int RAND_priv_bytes(unsigned char *buf, int num);
+//
+//go:linkname RANDPrivBufferWithLen C.RAND_priv_bytes
+func RANDPrivBufferWithLen(buf *byte, num c.Int) c.Int
+
+func RANDPrivBytes(buf []byte) c.Int {
+	return RANDPrivBufferWithLen(unsafe.SliceData(buf), c.Int(len(buf)))
+}
+
+// void RAND_seed(const void *buf, int num);
+//
+//go:linkname RANDSeed C.RAND_seed
+func RANDSeed(buf unsafe.Pointer, num c.Int)
+
+// void RAND_keep_random_devices_open(int keep);
+//
+//go:linkname RANDKeepRandomDevicesOpen C.RAND_keep_random_devices_open
+func RANDKeepRandomDevicesOpen(keep c.Int)
+
+// int RAND_load_file(const char *file, long max_bytes);
+//
+//go:linkname RANDLoadFile C.RAND_load_file
+func RANDLoadFile(file *c.Char, maxBytes c.Long) c.Int
+
+// int RAND_write_file(const char *file);
+//
+//go:linkname RANDWriteFile C.RAND_write_file
+func RANDWriteFile(file *c.Char) c.Int
+
+// const char *RAND_file_name(char *file, size_t num);
+//
+//go:linkname RANDFileName C.RAND_file_name
+func RANDFileName(file *c.Char, num uintptr) *c.Char
+
+// int RAND_status(void);
+//
+//go:linkname RANDStatus C.RAND_status
+func RANDStatus() c.Int
+
+// int RAND_poll(void);
+//
+//go:linkname RANDPoll C.RAND_poll
+func RANDPoll() c.Int
+
+// -----------------------------------------------------------------------------