SHA1 hash question

Question

I have this method for hashing a string:

byte[] buffer = enc.GetBytes(text); SHA1CryptoServiceProvider cryptoTransformSHA1 = new SHA1CryptoServiceProvider(); string hash = BitConverter.ToString( cryptoTransformSHA1.ComputeHash(buffer)).Replace("-", ""); return hash; 

My question is:

Is the resulting hash always the same for the same string?

I wrote a couple of days ago, and it seems that now it has led to another hash, but I'm not sure.

Answer 1

Yes, the same plaintext string will hash to the same SHA1 hash each time.

Answer 2

As long as the bytes are the same, you will get exactly the same hash. Note that special characters and spaces are also bytes.

Wikipedia Link

Answer 3

Id depends! The same string text string will be hashes for the same SHA1 hash if you use the same encoding! Using different encodings will result in different SHA1 hashes.