diff --git a/README.md b/README.md
index 6e29592..b56af37 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Emojisum
+[![Build Status](https://travis-ci.org/emojisum/emojisum.svg?branch=master)](https://travis-ci.org/emojisum/emojisum)
 
-:pray: :paperclip: An easier way to compare hashes /fingerprints, when dealing with the human weak link :link: :tada:
+:pray: :paperclip: Emoji that checksum! :tada: :poop:
 
 A curated list of 256 emojis that are not entirely similar.
 Using http://www.webpagefx.com/tools/emoji-cheat-sheet/ and http://www.unicode.org/emoji/charts/full-emoji-list.html to compare them.
diff --git a/cmd/coreutils.go b/cmd/coreutils.go
deleted file mode 100644
index 6bf06a7..0000000
--- a/cmd/coreutils.go
+++ /dev/null
@@ -1,61 +0,0 @@
-package cmd
-
-import (
-	"bufio"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"io"
-	"os"
-	"strings"
-
-	"github.com/kyokomi/emoji"
-)
-
-/*
-ParseCoreUtils expects some input like:
-```shell
-$ sha256sum ./tmp.efLuko
-f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb  ./tmp.efLuko
-```
-*/
-func ParseCoreUtils(line string) (filename string, sum []byte, err error) {
-	chunks := strings.SplitN(strings.TrimRight(line, "\n"), "  ", 2)
-	if len(chunks) != 2 {
-		return "", nil, ErrNotCoreUtilsLine
-	}
-	sum, err = hex.DecodeString(chunks[0])
-	if err != nil {
-		return "", nil, err
-	}
-	return chunks[1], sum, nil
-}
-
-// ErrNotCoreUtilsLine when the line to parse is not formated like a coreutils checksum line
-var ErrNotCoreUtilsLine = errors.New("not a coreutils checksum line")
-
-// PrintCoreUtils reads in the content like from `sha25sum ...` and returns
-// in likeness but with emojisum instead.
-// TODO(vb) return a buffer that the caller can choose to print out themselves
-func PrintCoreUtils(rdr io.Reader) error {
-	buf := bufio.NewReader(rdr)
-	for {
-		line, err := buf.ReadString('\n')
-		if err != nil && err == io.EOF {
-			break
-		} else if err != nil {
-			return err
-		}
-		name, sum, err := ParseCoreUtils(line)
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
-			continue
-		}
-		str := EmojiFromBytes(sum)
-		fmt.Printf("%x  %s\n", sum, name)
-		fmt.Printf("%s  %s\n", str, name)
-		emoji.Print(str)
-		fmt.Printf("  %s\n", name)
-	}
-	return nil
-}
diff --git a/cmd/emoji.go b/cmd/emoji.go
deleted file mode 100644
index 7907bcf..0000000
--- a/cmd/emoji.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package cmd
-
-import (
-	esum "github.com/emojisum/emojisum/emoji"
-)
-
-// EmojiFromBytes parses the bytes buffer for colon notation and returns the
-// corresponding emoji
-func EmojiFromBytes(buf []byte) string {
-	var ret string
-	for _, b := range buf {
-		for _, e := range esum.Map(b) {
-			// use the first colon notation word and continue
-			if esum.IsColonNotation(e) {
-				ret = ret + e
-				break
-			}
-		}
-	}
-	return ret
-}
diff --git a/cmd/openssl.go b/cmd/openssl.go
deleted file mode 100644
index b351d83..0000000
--- a/cmd/openssl.go
+++ /dev/null
@@ -1,68 +0,0 @@
-package cmd
-
-import (
-	"bufio"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"io"
-	"os"
-	"strings"
-
-	"github.com/kyokomi/emoji"
-)
-
-/*
-ParseOpenSSL expects some input like:
-```shell
-$> openssl sha256 tmp.efLuko
-SHA256(tmp.efLuko)= f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb
-```
-*/
-func ParseOpenSSL(line string) (hash, filename string, sum []byte, err error) {
-	if !strings.Contains(line, "(") {
-		return "", "", nil, ErrNotOpenSSLLine
-	}
-	chunks := strings.SplitN(strings.TrimRight(line, "\n"), ")= ", 2)
-	if len(chunks) != 2 {
-		return "", "", nil, ErrNotOpenSSLLine
-	}
-	chunksprime := strings.SplitN(chunks[0], "(", 2)
-	if len(chunks) != 2 {
-		return "", "", nil, ErrNotOpenSSLLine
-	}
-	sum, err = hex.DecodeString(chunks[1])
-	if err != nil {
-		return "", "", nil, err
-	}
-	return chunksprime[0], chunksprime[1], sum, nil
-}
-
-// ErrNotOpenSSLLine when the line to parse is not formated like an OpenSSL checksum line
-var ErrNotOpenSSLLine = errors.New("not an openssl checksum line")
-
-// PrintOpenSSL reads in the content like from `openssl sha25 ...` and returns
-// in likeness but with emojisum instead.
-// TODO(vb) return a buffer that the caller can choose to print out themselves
-func PrintOpenSSL(rdr io.Reader) error {
-	buf := bufio.NewReader(rdr)
-	for {
-		line, err := buf.ReadString('\n')
-		if err != nil && err == io.EOF {
-			break
-		} else if err != nil {
-			return err
-		}
-		hash, name, sum, err := ParseOpenSSL(line)
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
-			continue
-		}
-		str := EmojiFromBytes(sum)
-		fmt.Printf("%s(%s)= %x\n", hash, name, sum)
-		fmt.Printf("%s(%s)= %s\n", hash, name, str)
-		fmt.Printf("%s(%s)= ", hash, name)
-		emoji.Println(str)
-	}
-	return nil
-}
diff --git a/emoji/go.mod b/emoji/go.mod
new file mode 100644
index 0000000..627fae2
--- /dev/null
+++ b/emoji/go.mod
@@ -0,0 +1,3 @@
+module github.com/emojisum/emojisum/emoji
+
+go 1.17
diff --git a/main.go b/main.go
index 5b3ad3f..06c57c2 100644
--- a/main.go
+++ b/main.go
@@ -1,11 +1,17 @@
 package main
 
 import (
+	"bufio"
+	"crypto/sha1"
+	"encoding/hex"
+	"errors"
 	"flag"
 	"fmt"
+	"io"
 	"os"
+	"strings"
 
-	"github.com/emojisum/emojisum/cmd"
+	esum "github.com/emojisum/emojisum/emoji"
 	"github.com/kyokomi/emoji"
 )
 
@@ -25,20 +31,58 @@ func run() error {
 	flag.Parse()
 
 	if *flParseOpenSSL {
-		return cmd.PrintOpenSSL(os.Stdin)
+		buf := bufio.NewReader(os.Stdin)
+		for {
+			line, err := buf.ReadString('\n')
+			if err != nil && err == io.EOF {
+				return nil
+			} else if err != nil {
+				return err
+			}
+			hash, name, sum, err := parseOpenSSL(line)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
+				continue
+			}
+			str := emojiFromBytes(sum)
+			fmt.Printf("%s(%s)= %x\n", hash, name, sum)
+			fmt.Printf("%s(%s)= %s\n", hash, name, str)
+			fmt.Printf("%s(%s)= ", hash, name)
+			emoji.Println(str)
+		}
+		// never gets here because of the return on EOF or err
 	}
 	if *flParseCoreUtils {
-		return cmd.PrintCoreUtils(os.Stdin)
+		buf := bufio.NewReader(os.Stdin)
+		for {
+			line, err := buf.ReadString('\n')
+			if err != nil && err == io.EOF {
+				return nil
+			} else if err != nil {
+				return err
+			}
+			name, sum, err := parseCoreUtils(line)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
+				continue
+			}
+			str := emojiFromBytes(sum)
+			fmt.Printf("%x  %s\n", sum, name)
+			fmt.Printf("%s  %s\n", str, name)
+			emoji.Print(str)
+			fmt.Printf("  %s\n", name)
+		}
+		// never gets here because of the return on EOF or err
 	}
 
 	// Otherwise do the checksum ourselves
 
 	if flag.NArg() == 0 {
-		sum, err := cmd.Sum(os.Stdin)
+		sum, err := Sum(os.Stdin)
 		if err != nil {
 			return err
 		}
-		str := cmd.EmojiFromBytes(sum)
+		str := emojiFromBytes(sum)
 		fmt.Printf("SHA1(-)= %x\n", sum)
 		fmt.Printf("SHA1(-)= %s\n", str)
 		fmt.Printf("SHA1(-)= ")
@@ -53,11 +97,11 @@ func run() error {
 		}
 		defer fh.Close()
 
-		sum, err := cmd.Sum(fh)
+		sum, err := Sum(fh)
 		if err != nil {
 			return err
 		}
-		str := cmd.EmojiFromBytes(sum)
+		str := emojiFromBytes(sum)
 		fmt.Printf("SHA1(%s)= %x\n", arg, sum)
 		fmt.Printf("SHA1(%s)= %s\n", arg, str)
 		fmt.Printf("SHA1(%s)= ", arg)
@@ -65,3 +109,78 @@ func run() error {
 	}
 	return nil
 }
+
+/*
+openssl sum:
+```
+$> openssl sha256 tmp.efLuko
+SHA256(tmp.efLuko)= f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb
+```
+*/
+func parseOpenSSL(line string) (hash, filename string, sum []byte, err error) {
+	if !strings.Contains(line, "(") {
+		return "", "", nil, ErrNotOpenSSLLine
+	}
+	chunks := strings.SplitN(strings.TrimRight(line, "\n"), ")= ", 2)
+	if len(chunks) != 2 {
+		return "", "", nil, ErrNotOpenSSLLine
+	}
+	chunksprime := strings.SplitN(chunks[0], "(", 2)
+	if len(chunks) != 2 {
+		return "", "", nil, ErrNotOpenSSLLine
+	}
+	sum, err = hex.DecodeString(chunks[1])
+	if err != nil {
+		return "", "", nil, err
+	}
+	return chunksprime[0], chunksprime[1], sum, nil
+}
+
+// ErrNotOpenSSLLine when the line to parse is not formated like an OpenSSL checksum line
+var ErrNotOpenSSLLine = errors.New("not an openssl checksum line")
+
+/*
+coreutils output:
+```
+$ sha256sum ./tmp.efLuko
+f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb  ./tmp.efLuko
+```
+*/
+func parseCoreUtils(line string) (filename string, sum []byte, err error) {
+	chunks := strings.SplitN(strings.TrimRight(line, "\n"), "  ", 2)
+	if len(chunks) != 2 {
+		return "", nil, ErrNotCoreUtilsLine
+	}
+	sum, err = hex.DecodeString(chunks[0])
+	if err != nil {
+		return "", nil, err
+	}
+	return chunks[1], sum, nil
+}
+
+// ErrNotCoreUtilsLine when the line to parse is not formated like a coreutils checksum line
+var ErrNotCoreUtilsLine = errors.New("not a coreutils checksum line")
+
+// Sum is a basic wrapper around crypto/sha1
+func Sum(r io.Reader) ([]byte, error) {
+	h := sha1.New()
+	if _, err := io.Copy(h, r); err != nil {
+		return nil, err
+	}
+	sum := h.Sum(nil)
+	return sum[:], nil
+}
+
+func emojiFromBytes(buf []byte) string {
+	var ret string
+	for _, b := range buf {
+		for _, e := range esum.Map(b) {
+			// use the first colon notation word and continue
+			if esum.IsColonNotation(e) {
+				ret = ret + e
+				break
+			}
+		}
+	}
+	return ret
+}