diff --git a/README.md b/README.md
index 10d12960..4766ac6d 100644
--- a/README.md
+++ b/README.md
@@ -305,6 +305,9 @@ Here are the Go packages that can be imported correctly:
 * [hash/crc32](https://pkg.go.dev/hash/crc32) (partially)
 * [hash/crc64](https://pkg.go.dev/hash/crc64)
 * [crypto/md5](https://pkg.go.dev/crypto/md5)
+* [crypto/sha1](https://pkg.go.dev/crypto/sha1)
+* [crypto/sha256](https://pkg.go.dev/crypto/sha256)
+* [crypto/sha512](https://pkg.go.dev/crypto/sha512) (partially)
 * [crypto/rand](https://pkg.go.dev/crypto/rand) (partially)
 * [regexp](https://pkg.go.dev/regexp)
 * [regexp/syntax](https://pkg.go.dev/regexp/syntax)
diff --git a/internal/lib/crypto/md5/md5.go b/internal/lib/crypto/md5/md5.go
index 9baf0419..7865000e 100644
--- a/internal/lib/crypto/md5/md5.go
+++ b/internal/lib/crypto/md5/md5.go
@@ -18,6 +18,7 @@ package md5
 
 // llgo:skipall
 import (
+	"crypto"
 	"hash"
 	"unsafe"
 
@@ -25,6 +26,10 @@ import (
 	"github.com/goplus/llgo/c/openssl"
 )
 
+func init() {
+	crypto.RegisterHash(crypto.MD5, New)
+}
+
 // The blocksize of MD5 in bytes.
 const BlockSize = 64
 
diff --git a/internal/lib/crypto/sha1/sha1.go b/internal/lib/crypto/sha1/sha1.go
index 93637a51..d804ef10 100644
--- a/internal/lib/crypto/sha1/sha1.go
+++ b/internal/lib/crypto/sha1/sha1.go
@@ -2,6 +2,7 @@ package sha1
 
 // llgo:skipall
 import (
+	"crypto"
 	"hash"
 	"unsafe"
 
@@ -9,6 +10,10 @@ import (
 	"github.com/goplus/llgo/c/openssl"
 )
 
+func init() {
+	crypto.RegisterHash(crypto.SHA1, New)
+}
+
 // The blocksize of SHA-1 in bytes.
 const BlockSize = 64
 
diff --git a/internal/lib/crypto/sha256/sha224.go b/internal/lib/crypto/sha256/sha224.go
index 2a9d5a70..79d9d0da 100644
--- a/internal/lib/crypto/sha256/sha224.go
+++ b/internal/lib/crypto/sha256/sha224.go
@@ -1,12 +1,16 @@
 package sha256
 
 import (
+	"hash"
 	"unsafe"
 
 	"github.com/goplus/llgo/c"
 	"github.com/goplus/llgo/c/openssl"
 )
 
+// The size of a SHA224 checksum in bytes.
+const Size224 = 28
+
 type digest224 struct {
 	ctx openssl.SHA224_CTX
 }
@@ -29,3 +33,16 @@ func (d *digest224) Sum(in []byte) []byte {
 	d.ctx.Final((*byte)(unsafe.Pointer(hash)))
 	return append(in, hash[:]...)
 }
+
+// New224 returns a new hash.Hash computing the SHA224 checksum.
+func New224() hash.Hash {
+	d := new(digest224)
+	d.ctx.Init()
+	return d
+}
+
+// Sum224 returns the SHA224 checksum of the data.
+func Sum224(data []byte) (ret [Size224]byte) {
+	openssl.SHA224Bytes(data, &ret[0])
+	return
+}
diff --git a/internal/lib/crypto/sha256/sha256.go b/internal/lib/crypto/sha256/sha256.go
index 480325be..4e4dcb00 100644
--- a/internal/lib/crypto/sha256/sha256.go
+++ b/internal/lib/crypto/sha256/sha256.go
@@ -2,6 +2,7 @@ package sha256
 
 // llgo:skipall
 import (
+	"crypto"
 	"hash"
 	"unsafe"
 
@@ -9,15 +10,17 @@ import (
 	"github.com/goplus/llgo/c/openssl"
 )
 
+func init() {
+	crypto.RegisterHash(crypto.SHA224, New224)
+	crypto.RegisterHash(crypto.SHA256, New)
+}
+
 // The blocksize of SHA256 and SHA224 in bytes.
 const BlockSize = 64
 
 // The size of a SHA256 checksum in bytes.
 const Size = 32
 
-// The size of a SHA224 checksum in bytes.
-const Size224 = 28
-
 type digest256 struct {
 	ctx openssl.SHA256_CTX
 }
@@ -48,19 +51,6 @@ func New() hash.Hash {
 	return d
 }
 
-// New224 returns a new hash.Hash computing the SHA224 checksum.
-func New224() hash.Hash {
-	d := new(digest224)
-	d.ctx.Init()
-	return d
-}
-
-// Sum224 returns the SHA224 checksum of the data.
-func Sum224(data []byte) (ret [Size224]byte) {
-	openssl.SHA224Bytes(data, &ret[0])
-	return
-}
-
 // Sum256 returns the SHA256 checksum of the data.
 func Sum256(data []byte) (ret [Size]byte) {
 	openssl.SHA256Bytes(data, &ret[0])
diff --git a/internal/lib/crypto/sha512/sha384.go b/internal/lib/crypto/sha512/sha384.go
index ab69e872..ecfd18d7 100644
--- a/internal/lib/crypto/sha512/sha384.go
+++ b/internal/lib/crypto/sha512/sha384.go
@@ -1,6 +1,7 @@
 package sha512
 
 import (
+	"hash"
 	"unsafe"
 
 	"github.com/goplus/llgo/c"
@@ -29,3 +30,14 @@ func (d *digest384) Sum(in []byte) []byte {
 	d.ctx.Final((*byte)(unsafe.Pointer(hash)))
 	return append(in, hash[:]...)
 }
+
+func New384() hash.Hash {
+	d := new(digest384)
+	d.ctx.Init()
+	return d
+}
+
+func Sum384(data []byte) (ret [Size384]byte) {
+	openssl.SHA384Bytes(data, &ret[0])
+	return
+}
diff --git a/internal/lib/crypto/sha512/sha512.go b/internal/lib/crypto/sha512/sha512.go
index 0cdf6ec9..57790485 100644
--- a/internal/lib/crypto/sha512/sha512.go
+++ b/internal/lib/crypto/sha512/sha512.go
@@ -2,6 +2,7 @@ package sha512
 
 // llgo:skipall
 import (
+	"crypto"
 	"hash"
 	"unsafe"
 
@@ -9,6 +10,13 @@ import (
 	"github.com/goplus/llgo/c/openssl"
 )
 
+func init() {
+	crypto.RegisterHash(crypto.SHA384, New384)
+	crypto.RegisterHash(crypto.SHA512, New)
+	crypto.RegisterHash(crypto.SHA512_224, New512_224)
+	crypto.RegisterHash(crypto.SHA512_256, New512_256)
+}
+
 const (
 	// Size is the size, in bytes, of a SHA-512 checksum.
 	Size = 64
@@ -56,34 +64,23 @@ func New() hash.Hash {
 	return d
 }
 
-func New384() hash.Hash {
-	d := new(digest384)
-	d.ctx.Init()
-	return d
-}
-
-func Sum384(data []byte) (ret [Size384]byte) {
-	openssl.SHA384Bytes(data, &ret[0])
-	return
-}
-
 func Sum512(data []byte) (ret [Size]byte) {
 	openssl.SHA512Bytes(data, &ret[0])
 	return
 }
 
 func New512_224() hash.Hash {
-	panic("todo: New512_224")
-}
-
-func New512_256() hash.Hash {
-	panic("todo: New512_256")
+	panic("todo: crypto/sha512.New512_224")
 }
 
 func Sum512_224(data []byte) [Size224]byte {
-	panic("todo: Sum512_224")
+	panic("todo: crypto/sha512.Sum512_224")
+}
+
+func New512_256() hash.Hash {
+	panic("todo: crypto/sha512.New512_256")
 }
 
 func Sum512_256(data []byte) [Size256]byte {
-	panic("todo: Sum512_256")
+	panic("todo: crypto/sha512.Sum512_256")
 }