diff --git a/README.md b/README.md
index f9c3fcf4..a6963999 100644
--- a/README.md
+++ b/README.md
@@ -297,6 +297,7 @@ Here are the Go packages that can be imported correctly:
 * [encoding/base32](https://pkg.go.dev/encoding/base32)
 * [encoding/base64](https://pkg.go.dev/encoding/base64)
 * [encoding/csv](https://pkg.go.dev/encoding/csv)
+* [crypto/md5](https://pkg.go.dev/crypto/md5)
 * [regexp](https://pkg.go.dev/regexp)
 * [regexp/syntax](https://pkg.go.dev/regexp/syntax)
 
diff --git a/_cmptest/_md5demo/md5.go b/_cmptest/md5demo/md5.go
similarity index 100%
rename from _cmptest/_md5demo/md5.go
rename to _cmptest/md5demo/md5.go
diff --git a/_demo/cmd5demo/md5.go b/_demo/cmd5demo/md5.go
index 1c08a192..26db4527 100644
--- a/_demo/cmd5demo/md5.go
+++ b/_demo/cmd5demo/md5.go
@@ -13,6 +13,6 @@ func main() {
 	md5.Init()
 	md5.UpdateString("The fog is getting thicker!")
 	md5.UpdateString("And Leon's getting laaarger!")
-	md5.Final(unsafe.Pointer(unsafe.SliceData(h)))
+	md5.Final(unsafe.SliceData(h))
 	fmt.Printf("%x", h)
 }
diff --git a/c/openssl/md5.go b/c/openssl/md5.go
index b828da9f..99aac0c3 100644
--- a/c/openssl/md5.go
+++ b/c/openssl/md5.go
@@ -61,22 +61,22 @@ func (c *MD5_CTX) UpdateString(data string) c.Int {
 // OSSL_DEPRECATEDIN_3_0 int MD5_Final(unsigned char *md, MD5_CTX *c);
 //
 //go:linkname md5Final C.MD5_Final
-func md5Final(md unsafe.Pointer, c *MD5_CTX) c.Int
+func md5Final(md *byte, c *MD5_CTX) c.Int
 
-func (c *MD5_CTX) Final(md unsafe.Pointer) c.Int {
+func (c *MD5_CTX) Final(md *byte) c.Int {
 	return md5Final(md, c)
 }
 
 // OSSL_DEPRECATEDIN_3_0 unsigned char *MD5(const unsigned char *d, size_t n, unsigned char *md);
 //
 //go:linkname MD5 C.MD5
-func MD5(data unsafe.Pointer, n uintptr, md unsafe.Pointer) unsafe.Pointer
+func MD5(data unsafe.Pointer, n uintptr, md *byte) *byte
 
-func MD5Bytes(data []byte, md unsafe.Pointer) unsafe.Pointer {
+func MD5Bytes(data []byte, md *byte) *byte {
 	return MD5(unsafe.Pointer(unsafe.SliceData(data)), uintptr(len(data)), md)
 }
 
-func MD5String(data string, md unsafe.Pointer) unsafe.Pointer {
+func MD5String(data string, md *byte) *byte {
 	return MD5(unsafe.Pointer(unsafe.StringData(data)), uintptr(len(data)), md)
 }
 
diff --git a/cl/import.go b/cl/import.go
index 43d5aa0e..6729b7cf 100644
--- a/cl/import.go
+++ b/cl/import.go
@@ -590,9 +590,8 @@ func ignoreName(name string) bool {
 	*/
 	const internal = "internal/"
 	return (strings.HasPrefix(name, internal) && !supportedInternal(name[len(internal):])) ||
-		strings.HasPrefix(name, "crypto/") || strings.HasPrefix(name, "runtime/") ||
-		strings.HasPrefix(name, "arena.") || strings.HasPrefix(name, "maps.") ||
-		strings.HasPrefix(name, "plugin.")
+		strings.HasPrefix(name, "runtime/") || strings.HasPrefix(name, "arena.") ||
+		strings.HasPrefix(name, "maps.") || strings.HasPrefix(name, "plugin.")
 }
 
 func supportedInternal(name string) bool {
diff --git a/internal/build/build.go b/internal/build/build.go
index 8854fb36..ce75c02a 100644
--- a/internal/build/build.go
+++ b/internal/build/build.go
@@ -755,6 +755,7 @@ func findDylibDep(exe, lib string) string {
 type none struct{}
 
 var hasAltPkg = map[string]none{
+	"crypto/md5":               {},
 	"fmt":                      {},
 	"internal/abi":             {},
 	"internal/bytealg":         {},
diff --git a/internal/lib/crypto/md5/md5.go b/internal/lib/crypto/md5/md5.go
new file mode 100644
index 00000000..9baf0419
--- /dev/null
+++ b/internal/lib/crypto/md5/md5.go
@@ -0,0 +1,66 @@
+/*
+ * 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 md5
+
+// llgo:skipall
+import (
+	"hash"
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/openssl"
+)
+
+// The blocksize of MD5 in bytes.
+const BlockSize = 64
+
+// The size of an MD5 checksum in bytes.
+const Size = 16
+
+type digest struct {
+	ctx openssl.MD5_CTX
+}
+
+func (d *digest) Size() int { return Size }
+
+func (d *digest) BlockSize() int { return BlockSize }
+
+func (d *digest) Reset() {
+	d.ctx.Init()
+}
+
+func (d *digest) Write(p []byte) (nn int, err error) {
+	d.ctx.UpdateBytes(p)
+	return len(p), nil
+}
+
+func (d *digest) Sum(in []byte) []byte {
+	hash := (*[Size]byte)(c.Alloca(Size))
+	d.ctx.Final((*byte)(unsafe.Pointer(hash)))
+	return append(in, hash[:]...)
+}
+
+func New() hash.Hash {
+	d := new(digest)
+	d.ctx.Init()
+	return d
+}
+
+func Sum(data []byte) (ret [Size]byte) {
+	openssl.MD5Bytes(data, &ret[0])
+	return
+}