Implement md5c function, slower than Golang's implementation

keeping it in repo to make further improvements and also rename

        minio-hash ---> crypto

cmd/crypto/.gitignore

@@ -0,0 +1 @@
+crypto

cmd/crypto/crypto-options.go

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+/*
+ * 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.
+ */
+
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+
+	"github.com/codegangsta/cli"
+	"github.com/minio-io/minio/pkgs/crypto/md5"
+	"github.com/minio-io/minio/pkgs/crypto/sha1"
+	"github.com/minio-io/minio/pkgs/crypto/sha256"
+	"github.com/minio-io/minio/pkgs/crypto/sha512"
+)
+
+var Options = []cli.Command{
+	Md5sum,
+	Sha1sum,
+	// Sha1sumFast, // not working
+	Sha256sum,
+	Sha512sum,
+}
+
+var Md5sum = cli.Command{
+	Name:  "md5sum",
+	Usage: "",
+	Description: `
+`,
+	Action: doMd5sum,
+}
+
+var Sha1sum = cli.Command{
+	Name:  "sha1sum",
+	Usage: "",
+	Description: `
+`,
+	Action: doSha1sum,
+}
+
+var Sha1sumFast = cli.Command{
+	Name:  "sha1sum-fast",
+	Usage: "",
+	Description: `
+`,
+	Action: doSha1sumFast,
+}
+
+var Sha256sum = cli.Command{
+	Name:  "sha256sum",
+	Usage: "",
+	Description: `
+`,
+	Action: doSha256sum,
+}
+
+var Sha512sum = cli.Command{
+	Name:  "sha512sum",
+	Usage: "",
+	Description: `
+`,
+	Action: doSha512sum,
+}
+
+func doMd5sum(c *cli.Context) {
+	hash, err := md5.Sum(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("%x", hash)
+}
+
+func doSha1sum(c *cli.Context) {
+	hash, err := sha1.Sum(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("%x", hash)
+}
+
+func doSha1sumFast(c *cli.Context) {
+	buffer, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+	hash, err := sha1.Sha1(buffer)
+	if err != nil {
+		log.Fatal(err)
+	}
+	var bytesBuffer bytes.Buffer
+	binary.Write(&bytesBuffer, binary.LittleEndian, hash)
+	fmt.Printf("%x", bytesBuffer.Bytes())
+}
+
+func doSha256sum(c *cli.Context) {
+	hash, err := sha256.Sum(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("%x", hash)
+}
+
+func doSha512sum(c *cli.Context) {
+	hash, err := sha512.Sum(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("%x", hash)
+}

cmd/crypto/crypto.go

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+/*
+ * 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.
+ */
+
+package main
+
+import (
+	"os"
+
+	"github.com/codegangsta/cli"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "crypto"
+	app.Usage = "calculate cryptosum on a given stream"
+	app.Commands = Options
+	app.Run(os.Args)
+}

cmd/crypto/crypto.md

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+% MINIO(1) Minio Manual
+% Minio community
+% December 2014
+# NAME
+crypto - calculate crypto sum on a stream
+
+# SYNOPSIS
+
+# DESCRIPTION
+```sh
+NAME:
+   crypto - calculate cryptosum on a given stream
+
+USAGE:
+   crypto [global options] command [command options] [arguments...]
+
+VERSION:
+   0.0.0
+
+COMMANDS:
+   md5sum
+   sha1sum
+   sha256sum
+   sha512sum
+   help, h      Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --help, -h           show help
+   --version, -v        print the version
+```
+# EXAMPLES
+
+# AUTHORS