Comparing 2 hashed byte arrays

Question

Consider the following code:

    MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
    byte[] hashedBytes;
    byte[] previousHashedBytes;

    UTF8Encoding encoder = new UTF8Encoding();
    // New hashedBytes array
    hashedBytes = md5Hasher.ComputeHash(encoder.GetBytes(someString + theValue));
    // previousHashedBytes retrieved from DB
    previousHashedBytes = GetPreviousValueFromDB();

The application then inserts hashedBytes into a database. I need to make sure due to a new policy that hashedBytes value cannot be reused, so I need some way to compare an existing hashedBytes value with a new one.

Note: the value for someString is always the same.

How does one compare previousHashedBytes with hashedBytes to see if they are the same?

Look into Enumerable.SequenceEquals()

John Alexiou
– John Alexiou

2018-08-15 15:47:42 +00:00
Commented Aug 15, 2018 at 15:47 — John Alexiou
– John Alexiou, Commented Aug 15, 2018 at 15:47

Neo · Accepted Answer · 2018-08-15 16:04:44Z

3

Basically, if you only have the byte hash in DB, you want to compare two byte array ?

You can get this here: Comparing two byte arrays in .NET

One of the options that might work for you is:

StructuralComparisons.StructuralEqualityComparer.Equals(hashedBytes,
 previousHashedBytes)

edited Aug 15, 2018 at 16:04

Neo

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answered Aug 15, 2018 at 15:35

Zysce

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