library: crypto/{sha1, sha256, sha512}

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
+}