How to Convert a Sized Byte Array (e.g., from MD5) to a String in Go?

Converting Sized Byte Arrays to Strings in Go

When working with byte arrays in Go, you may encounter situations where you need to convert them to strings. In this article, we'll specifically explore how to handle the conversion of sized byte arrays obtained through MD5 hashing.

To illustrate the issue, consider the following code snippet:

data := []byte("testing")
var pass string
var b [16]byte
b = md5.Sum(data)
pass = string(b)

This code is intended to convert the MD5 hash of the data byte array to a string. However, it results in the error:

cannot convert b (type [16]byte) to type string

Solution

The error occurs because b is a sized byte array of length 16, while string expects a slice of bytes as input. To resolve this issue, we can refer to b as a slice using the slicing syntax [:]. This allows us to convert the entire byte array to a string:

pass = string(b[:])

With this modification, the code successfully converts the MD5 hash to a string. You can now work with pass as a regular string, performing operations such as comparison, concatenation, or formatting.

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