Further restructure

pkg/utils/crypto/sha1/sha1.go

@@ -0,0 +1,85 @@
+/*
+ * Mini Object Storage, (C) 2014 Minio, Inc.
+ *
+ * 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.
+ */
+
+// +build amd64
+
+package sha1
+
+// #include <stdio.h>
+// #include <stdint.h>
+// void sha1_transform(int32_t *hash, const char* input, size_t num_blocks);
+import "C"
+import (
+	gosha1 "crypto/sha1"
+	"io"
+)
+
+/*
+const (
+	SHA1_BLOCKSIZE  = 64
+	SHA1_DIGESTSIZE = 20
+)
+
+
+func Sha1(buffer []byte) ([]int32, error) {
+	if cpu.HasAVX2() {
+		var shbuf []int32
+		var cbuffer *C.char
+
+		shbuf = make([]int32, SHA1_DIGESTSIZE)
+		var length = len(buffer)
+		if length == 0 {
+			return []int32{0}, errors.New("Invalid input")
+		}
+
+		rem := length % SHA1_BLOCKSIZE
+		padded_len := length
+
+		if rem > 0 {
+			padded_len = length + (SHA1_BLOCKSIZE - rem)
+		}
+
+		rounds := padded_len / SHA1_BLOCKSIZE
+		pad := padded_len - length
+		if pad > 0 {
+			s := make([]byte, pad)
+			// Expand with new padded blocks to the byte array
+			buffer = append(buffer, s...)
+		}
+
+		cshbuf := (*C.int32_t)(unsafe.Pointer(&shbuf[0]))
+		cbuffer = (*C.char)(unsafe.Pointer(&buffer[0]))
+		C.sha1_transform(cshbuf, cbuffer, C.size_t(rounds))
+
+		return 0, nil
+	}
+}
+*/
+func Sum(reader io.Reader) ([]byte, error) {
+	hash := gosha1.New()
+	var err error
+	for err == nil {
+		length := 0
+		byteBuffer := make([]byte, 1024*1024)
+		length, err = reader.Read(byteBuffer)
+		byteBuffer = byteBuffer[0:length]
+		hash.Write(byteBuffer)
+	}
+	if err != io.EOF {
+		return nil, err
+	}
+	return hash.Sum(nil), nil
+}