What is the specified key size for TripleDES in C#?

Question

So I'm trying to use the TripleDES algorithm in C#.

However, I keep getting an error saying that its not the specified key size.

What does that mean and how can I fix it?

Its occurring on the line:

tripledes.Key = pdb.GetBytes(112);

pdb is an Rfc2898DeriveBytes.

So yeah, how do I fix this error?

possible duplicate of [3DES Key Size Matter in C#.Net](http://stackoverflow.com/questions/5632211/3des-key-size-matter-in-c-net) — Chris Eberle, Jun 15 '11 at 20:25

score 2 · Answer 1 · answered Jun 15 '11 at 18:37

2

Should be 128 or 192. .NET Framework will only use the 112 or 168 bits, but you should specify 128 or 192.

answered Jun 15 '11 at 18:37

Jim

score 1 · Answer 2 · answered Jun 15 '11 at 18:39

1

Legal Key Size depends on your algorithm - see SymmetricAlgorithm.LegalKeySizes.

answered Jun 15 '11 at 18:39

Steve Townsend

2 Answers2