init: v1.0.0

mac/subtle/subtle.go

@@ -0,0 +1,48 @@
+package subtle
+
+import (
+	"crypto/sha1"
+	"crypto/sha256"
+	"crypto/sha512"
+	"errors"
+	"hash"
+
+	"xdx.jelly/xgcl/sm/sm3"
+)
+
+// hashDigestSize maps hash algorithms to their digest size in bytes.
+var hashDigestSize = map[string]uint32{
+	"SHA1":   uint32(20),
+	"SHA256": uint32(32),
+	"SHA384": uint32(48),
+	"SHA512": uint32(64),
+	"SM3":    uint32(32),
+}
+var errNilHashFunc = errors.New("nil hash function")
+
+// GetHashDigestSize returns the digest size of the specified hash algorithm.
+func GetHashDigestSize(hash string) (uint32, error) {
+	digestSize, ok := hashDigestSize[hash]
+	if !ok {
+		return 0, errors.New("invalid hash algorithm")
+	}
+	return digestSize, nil
+}
+
+// GetHashFunc returns the corresponding hash function of the given hash name.
+func GetHashFunc(hash string) func() hash.Hash {
+	switch hash {
+	case "SHA1":
+		return sha1.New
+	case "SHA256":
+		return sha256.New
+	case "SHA384":
+		return sha512.New384
+	case "SHA512":
+		return sha512.New
+	case "SM3":
+		return sm3.New
+	default:
+		return nil
+	}
+}