diff --git a/assert/log_test.go b/assert/log_test.go
new file mode 100644
index 0000000..7d86208
--- /dev/null
+++ b/assert/log_test.go
@@ -0,0 +1,7 @@
+package assert
+
+import "testing"
+
+func Test_logDepth(t *testing.T) {
+	logDepth(t, "test log", 1)
+}
diff --git a/cmd/checksum/main.go b/cmd/checksum/main.go
index 40d9f6b..f12df35 100644
--- a/cmd/checksum/main.go
+++ b/cmd/checksum/main.go
@@ -3,41 +3,16 @@ package main
 import (
 	"errors"
 	"fmt"
-	"github.com/tursom/checksum/checksum"
+	"github.com/tursom/checksum/hash"
 	"io"
 	"io/fs"
 	"os"
 	"path/filepath"
 )
 
-var (
-	hashFuncs = []func() checksum.Func{
-		func() checksum.Func { return &checksum.Md5{} },
-		func() checksum.Func { return &checksum.Sha1{} },
-		func() checksum.Func { return &checksum.Sha256{} },
-		func() checksum.Func { return &checksum.Sha512{} },
-		func() checksum.Func { return &checksum.Murmur332{} },
-		func() checksum.Func { return &checksum.Murmur364{} },
-		func() checksum.Func { return &checksum.Murmur3128{} },
-		func() checksum.Func { return &checksum.Adler32{} },
-		func() checksum.Func { return &checksum.Crc32Ieee{} },
-		func() checksum.Func { return &checksum.Crc32Castagnoli{} },
-		func() checksum.Func { return &checksum.Crc32Koopman{} },
-		func() checksum.Func { return &checksum.Crc64Iso{} },
-		func() checksum.Func { return &checksum.Crc64Ecma{} },
-		func() checksum.Func { return &checksum.Fnv32{} },
-		func() checksum.Func { return &checksum.Fnv32a{} },
-		func() checksum.Func { return &checksum.Fnv64{} },
-		func() checksum.Func { return &checksum.Fnv64a{} },
-		func() checksum.Func { return &checksum.Fnv128{} },
-		func() checksum.Func { return &checksum.Fnv128a{} },
-		func() checksum.Func { return &checksum.Xxh64{} },
-	}
-)
-
 func main() {
 	path, checksumType := readConfig()
-	doCheck(path, hashFuncs[checksumType-1])
+	doCheck(path, hash.Funcs[checksumType-1])
 	waitExit()
 }
 
@@ -50,7 +25,7 @@ func readConfig() (string, uint) {
 	}
 
 	fmt.Println("Please select checksum type:")
-	for i, f := range hashFuncs {
+	for i, f := range hash.Funcs {
 		fmt.Printf("%d. %s\n", i+1, f().String())
 	}
 	fmt.Print(">>> ")
@@ -61,11 +36,11 @@ func readConfig() (string, uint) {
 	return path, checksumType
 }
 
-func doCheck(path string, factory func() checksum.Func) {
+func doCheck(path string, factory func() hash.Func) {
 	checkFile(path, factory)
 }
 
-func checkFile(path string, factory func() checksum.Func) {
+func checkFile(path string, factory func() hash.Func) {
 	file, err := os.Open(path)
 	if err != nil {
 		panic(err)
diff --git a/checksum/adler32.go b/hash/adler32.go
similarity index 95%
rename from checksum/adler32.go
rename to hash/adler32.go
index 55d40eb..3ba5cbc 100644
--- a/checksum/adler32.go
+++ b/hash/adler32.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"hash"
diff --git a/checksum/adler32_test.go b/hash/adler32_test.go
similarity index 98%
rename from checksum/adler32_test.go
rename to hash/adler32_test.go
index 005c910..3b45174 100644
--- a/checksum/adler32_test.go
+++ b/hash/adler32_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/crc.go b/hash/crc.go
similarity index 99%
rename from checksum/crc.go
rename to hash/crc.go
index 464abd6..339335d 100644
--- a/checksum/crc.go
+++ b/hash/crc.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"hash"
diff --git a/checksum/crc32castagnoli_test.go b/hash/crc32castagnoli_test.go
similarity index 98%
rename from checksum/crc32castagnoli_test.go
rename to hash/crc32castagnoli_test.go
index c3767ed..7b9acc3 100644
--- a/checksum/crc32castagnoli_test.go
+++ b/hash/crc32castagnoli_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/crc32ieee_test.go b/hash/crc32ieee_test.go
similarity index 98%
rename from checksum/crc32ieee_test.go
rename to hash/crc32ieee_test.go
index 6d42ac0..f90c07d 100644
--- a/checksum/crc32ieee_test.go
+++ b/hash/crc32ieee_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/crc32koopman_test.go b/hash/crc32koopman_test.go
similarity index 98%
rename from checksum/crc32koopman_test.go
rename to hash/crc32koopman_test.go
index d33569a..7036f59 100644
--- a/checksum/crc32koopman_test.go
+++ b/hash/crc32koopman_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/crc64ecma_test.go b/hash/crc64ecma_test.go
similarity index 98%
rename from checksum/crc64ecma_test.go
rename to hash/crc64ecma_test.go
index 2fda023..e93dae6 100644
--- a/checksum/crc64ecma_test.go
+++ b/hash/crc64ecma_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/crc64iso_test.go b/hash/crc64iso_test.go
similarity index 98%
rename from checksum/crc64iso_test.go
rename to hash/crc64iso_test.go
index d7e67d0..1f32ebd 100644
--- a/checksum/crc64iso_test.go
+++ b/hash/crc64iso_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/crc_test.go b/hash/crc_test.go
similarity index 97%
rename from checksum/crc_test.go
rename to hash/crc_test.go
index 59dc7d8..b01da41 100644
--- a/checksum/crc_test.go
+++ b/hash/crc_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/def.go b/hash/def.go
similarity index 85%
rename from checksum/def.go
rename to hash/def.go
index b7fe54f..435d063 100644
--- a/checksum/def.go
+++ b/hash/def.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import "fmt"
 
diff --git a/checksum/fnv.go b/hash/fnv.go
similarity index 99%
rename from checksum/fnv.go
rename to hash/fnv.go
index dc6f82c..29677a9 100644
--- a/checksum/fnv.go
+++ b/hash/fnv.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"hash"
diff --git a/checksum/fnv128_test.go b/hash/fnv128_test.go
similarity index 98%
rename from checksum/fnv128_test.go
rename to hash/fnv128_test.go
index c6c8de0..0220a50 100644
--- a/checksum/fnv128_test.go
+++ b/hash/fnv128_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/fnv128a_test.go b/hash/fnv128a_test.go
similarity index 98%
rename from checksum/fnv128a_test.go
rename to hash/fnv128a_test.go
index ce3d786..d58b79e 100644
--- a/checksum/fnv128a_test.go
+++ b/hash/fnv128a_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/fnv32_test.go b/hash/fnv32_test.go
similarity index 98%
rename from checksum/fnv32_test.go
rename to hash/fnv32_test.go
index 401d070..c6dc867 100644
--- a/checksum/fnv32_test.go
+++ b/hash/fnv32_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/fnv32a_test.go b/hash/fnv32a_test.go
similarity index 98%
rename from checksum/fnv32a_test.go
rename to hash/fnv32a_test.go
index 5b32121..70d6ad3 100644
--- a/checksum/fnv32a_test.go
+++ b/hash/fnv32a_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/fnv64_test.go b/hash/fnv64_test.go
similarity index 98%
rename from checksum/fnv64_test.go
rename to hash/fnv64_test.go
index 4444153..87848c5 100644
--- a/checksum/fnv64_test.go
+++ b/hash/fnv64_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/fnv64a_test.go b/hash/fnv64a_test.go
similarity index 98%
rename from checksum/fnv64a_test.go
rename to hash/fnv64a_test.go
index 773aa90..d39b60e 100644
--- a/checksum/fnv64a_test.go
+++ b/hash/fnv64a_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/hash/funcs.go b/hash/funcs.go
new file mode 100644
index 0000000..db86bf1
--- /dev/null
+++ b/hash/funcs.go
@@ -0,0 +1,26 @@
+package hash
+
+var (
+	Funcs = []func() Func{
+		func() Func { return &Md5{} },
+		func() Func { return &Sha1{} },
+		func() Func { return &Sha256{} },
+		func() Func { return &Sha512{} },
+		func() Func { return &Murmur332{} },
+		func() Func { return &Murmur364{} },
+		func() Func { return &Murmur3128{} },
+		func() Func { return &Adler32{} },
+		func() Func { return &Crc32Ieee{} },
+		func() Func { return &Crc32Castagnoli{} },
+		func() Func { return &Crc32Koopman{} },
+		func() Func { return &Crc64Iso{} },
+		func() Func { return &Crc64Ecma{} },
+		func() Func { return &Fnv32{} },
+		func() Func { return &Fnv32a{} },
+		func() Func { return &Fnv64{} },
+		func() Func { return &Fnv64a{} },
+		func() Func { return &Fnv128{} },
+		func() Func { return &Fnv128a{} },
+		func() Func { return &Xxh64{} },
+	}
+)
diff --git a/checksum/md5.go b/hash/md5.go
similarity index 94%
rename from checksum/md5.go
rename to hash/md5.go
index ddfd8f7..a706bc9 100644
--- a/checksum/md5.go
+++ b/hash/md5.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/md5"
diff --git a/checksum/md5_test.go b/hash/md5_test.go
similarity index 97%
rename from checksum/md5_test.go
rename to hash/md5_test.go
index c834b61..d794f96 100644
--- a/checksum/md5_test.go
+++ b/hash/md5_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/md5"
diff --git a/checksum/murmur3.go b/hash/murmur3.go
similarity index 98%
rename from checksum/murmur3.go
rename to hash/murmur3.go
index 39529c1..bf5a31d 100644
--- a/checksum/murmur3.go
+++ b/hash/murmur3.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"hash"
diff --git a/checksum/murmur3_128_test.go b/hash/murmur3_128_test.go
similarity index 98%
rename from checksum/murmur3_128_test.go
rename to hash/murmur3_128_test.go
index 14f5171..b79a443 100644
--- a/checksum/murmur3_128_test.go
+++ b/hash/murmur3_128_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/murmur3_32_test.go b/hash/murmur3_32_test.go
similarity index 98%
rename from checksum/murmur3_32_test.go
rename to hash/murmur3_32_test.go
index f2e96b9..c755bfb 100644
--- a/checksum/murmur3_32_test.go
+++ b/hash/murmur3_32_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/murmur3_64_test.go b/hash/murmur3_64_test.go
similarity index 98%
rename from checksum/murmur3_64_test.go
rename to hash/murmur3_64_test.go
index 2cf7134..e0d5239 100644
--- a/checksum/murmur3_64_test.go
+++ b/hash/murmur3_64_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/tursom/checksum/assert"
diff --git a/checksum/sha1.go b/hash/sha1.go
similarity index 94%
rename from checksum/sha1.go
rename to hash/sha1.go
index 2ac8cbb..1a2328b 100644
--- a/checksum/sha1.go
+++ b/hash/sha1.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/sha1"
diff --git a/checksum/sha1_test.go b/hash/sha1_test.go
similarity index 97%
rename from checksum/sha1_test.go
rename to hash/sha1_test.go
index 62fe9b3..84b1440 100644
--- a/checksum/sha1_test.go
+++ b/hash/sha1_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/sha1"
diff --git a/checksum/sha256.go b/hash/sha256.go
similarity index 95%
rename from checksum/sha256.go
rename to hash/sha256.go
index 25cf267..8137fb7 100644
--- a/checksum/sha256.go
+++ b/hash/sha256.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/sha256"
diff --git a/checksum/sha256_test.go b/hash/sha256_test.go
similarity index 98%
rename from checksum/sha256_test.go
rename to hash/sha256_test.go
index c9d1d39..c1cb1d6 100644
--- a/checksum/sha256_test.go
+++ b/hash/sha256_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/sha256"
diff --git a/checksum/sha512.go b/hash/sha512.go
similarity index 95%
rename from checksum/sha512.go
rename to hash/sha512.go
index 4db8c5b..21ae16f 100644
--- a/checksum/sha512.go
+++ b/hash/sha512.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/sha512"
diff --git a/checksum/sha512_test.go b/hash/sha512_test.go
similarity index 98%
rename from checksum/sha512_test.go
rename to hash/sha512_test.go
index 387ac07..48eabd6 100644
--- a/checksum/sha512_test.go
+++ b/hash/sha512_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"crypto/sha512"
diff --git a/checksum/xxh.go b/hash/xxh.go
similarity index 95%
rename from checksum/xxh.go
rename to hash/xxh.go
index bc5a686..93c74f1 100644
--- a/checksum/xxh.go
+++ b/hash/xxh.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/cespare/xxhash"
diff --git a/checksum/xxhash64_test.go b/hash/xxhash64_test.go
similarity index 98%
rename from checksum/xxhash64_test.go
rename to hash/xxhash64_test.go
index 0d99342..cc83cb6 100644
--- a/checksum/xxhash64_test.go
+++ b/hash/xxhash64_test.go
@@ -1,4 +1,4 @@
-package checksum
+package hash
 
 import (
 	"github.com/cespare/xxhash"