diff --git a/src/commonMain/kotlin/com/infendro/hash/HashFunction.kt b/src/commonMain/kotlin/com/infendro/hash/HashFunction.kt
index d7aef53..47d6013 100644
--- a/src/commonMain/kotlin/com/infendro/hash/HashFunction.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/HashFunction.kt
@@ -1,6 +1,10 @@
 package com.infendro.hash
 
 sealed class HashFunction {
+    abstract val bytes: Int
+    val bits: Int
+        get() = bytes * 8
+
     abstract fun hash(
         value: ByteArray,
     ): ByteArray
diff --git a/src/commonMain/kotlin/com/infendro/hash/MD5.kt b/src/commonMain/kotlin/com/infendro/hash/MD5.kt
index c2eea38..0a51ced 100644
--- a/src/commonMain/kotlin/com/infendro/hash/MD5.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/MD5.kt
@@ -6,6 +6,9 @@ import com.infendro.hash.util.toByteArray
 import com.infendro.hash.util.toUIntArray
 
 object MD5 : HashFunction() {
+    override val bytes: Int
+        get() = 16
+
     private val s = arrayOf(
         7, 12, 17, 22,
         7, 12, 17, 22,
diff --git a/src/commonMain/kotlin/com/infendro/hash/SHA1.kt b/src/commonMain/kotlin/com/infendro/hash/SHA1.kt
index d2ca6cb..744cabd 100644
--- a/src/commonMain/kotlin/com/infendro/hash/SHA1.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/SHA1.kt
@@ -5,6 +5,9 @@ import com.infendro.hash.util.toByteArray
 import com.infendro.hash.util.toUIntArray
 
 object SHA1 : HashFunction() {
+    override val bytes: Int
+        get() = 20
+
     override fun hash(
         value: ByteArray,
     ): ByteArray {
diff --git a/src/commonMain/kotlin/com/infendro/hash/SHA224.kt b/src/commonMain/kotlin/com/infendro/hash/SHA224.kt
index 31b29ef..9cb74bb 100644
--- a/src/commonMain/kotlin/com/infendro/hash/SHA224.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/SHA224.kt
@@ -5,6 +5,9 @@ import com.infendro.hash.util.toByteArray
 import com.infendro.hash.util.toUIntArray
 
 object SHA224 : HashFunction() {
+    override val bytes: Int
+        get() = 28
+
     private val k = arrayOf(
         0x428a2f98U, 0x71374491U, 0xb5c0fbcfU, 0xe9b5dba5U, 0x3956c25bU, 0x59f111f1U, 0x923f82a4U, 0xab1c5ed5U,
         0xd807aa98U, 0x12835b01U, 0x243185beU, 0x550c7dc3U, 0x72be5d74U, 0x80deb1feU, 0x9bdc06a7U, 0xc19bf174U,
diff --git a/src/commonMain/kotlin/com/infendro/hash/SHA256.kt b/src/commonMain/kotlin/com/infendro/hash/SHA256.kt
index 46f69a6..bbed26d 100644
--- a/src/commonMain/kotlin/com/infendro/hash/SHA256.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/SHA256.kt
@@ -5,6 +5,9 @@ import com.infendro.hash.util.toByteArray
 import com.infendro.hash.util.toUIntArray
 
 object SHA256 : HashFunction() {
+    override val bytes: Int
+        get() = 32
+
     private val k = arrayOf(
         0x428a2f98U, 0x71374491U, 0xb5c0fbcfU, 0xe9b5dba5U, 0x3956c25bU, 0x59f111f1U, 0x923f82a4U, 0xab1c5ed5U,
         0xd807aa98U, 0x12835b01U, 0x243185beU, 0x550c7dc3U, 0x72be5d74U, 0x80deb1feU, 0x9bdc06a7U, 0xc19bf174U,
diff --git a/src/commonMain/kotlin/com/infendro/hash/SHA384.kt b/src/commonMain/kotlin/com/infendro/hash/SHA384.kt
index d069bd4..93a2bea 100644
--- a/src/commonMain/kotlin/com/infendro/hash/SHA384.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/SHA384.kt
@@ -5,6 +5,9 @@ import com.infendro.hash.util.toByteArray
 import com.infendro.hash.util.toULongArray
 
 object SHA384 : HashFunction() {
+    override val bytes: Int
+        get() = 48
+
     private val k = arrayOf(
         0x428a2f98d728ae22UL, 0x7137449123ef65cdUL, 0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL, 0x3956c25bf348b538UL,
         0x59f111f1b605d019UL, 0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL, 0xd807aa98a3030242UL, 0x12835b0145706fbeUL,
diff --git a/src/commonMain/kotlin/com/infendro/hash/SHA512.kt b/src/commonMain/kotlin/com/infendro/hash/SHA512.kt
index b3f45ad..92b5404 100644
--- a/src/commonMain/kotlin/com/infendro/hash/SHA512.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/SHA512.kt
@@ -5,6 +5,9 @@ import com.infendro.hash.util.toByteArray
 import com.infendro.hash.util.toULongArray
 
 object SHA512 : HashFunction() {
+    override val bytes: Int
+        get() = 64
+
     private val k = arrayOf(
         0x428a2f98d728ae22UL, 0x7137449123ef65cdUL, 0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL, 0x3956c25bf348b538UL,
         0x59f111f1b605d019UL, 0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL, 0xd807aa98a3030242UL, 0x12835b0145706fbeUL,