diff --git a/common/src/main/kotlin/ru/touchin/common/byte/ByteUtils.kt b/common/src/main/kotlin/ru/touchin/common/byte/ByteUtils.kt
new file mode 100644
index 0000000..3a7e7fd
--- /dev/null
+++ b/common/src/main/kotlin/ru/touchin/common/byte/ByteUtils.kt
@@ -0,0 +1,11 @@
+package ru.touchin.common.byte
+
+object ByteUtils {
+
+    fun ByteArray.toHex(): String {
+        return joinToString(separator = "") { byte ->
+            "%02x".format(byte)
+        }
+    }
+
+}
diff --git a/common/src/main/kotlin/ru/touchin/common/security/hash/HashUtils.kt b/common/src/main/kotlin/ru/touchin/common/security/hash/HashUtils.kt
new file mode 100644
index 0000000..b8b4635
--- /dev/null
+++ b/common/src/main/kotlin/ru/touchin/common/security/hash/HashUtils.kt
@@ -0,0 +1,17 @@
+package ru.touchin.common.security.hash
+
+import java.nio.charset.StandardCharsets.UTF_8
+import java.security.MessageDigest
+
+object HashUtils {
+
+    enum class HashAlgorithm {
+        MD5
+    }
+
+    fun String.calcHash(algorithmName: HashAlgorithm): ByteArray {
+        return MessageDigest.getInstance(algorithmName.name)
+            .digest(this.toByteArray(UTF_8))
+    }
+
+}