Hashing is used in digital signatures. By default DidiSoft OpenPGP Library for .NET uses SHA1.
To set another hashing algorithm to be used for signing data, you have to change the default with the property Hash of a PGPLib class instance.
The possible values are listed in the DidiSoft.Pgp.HashAlgorithm enumeration:
HashAlgorithm.SHA1 HashAlgorithm.SHA256 HashAlgorithm.SHA384 HashAlgorithm.SHA512 HashAlgorithm.SHA224 HashAlgorithm.MD5 HashAlgorithm.MD2 HashAlgorithm.RIPEMD160 |
The change will have effect on subsequent calls to all Sign and SignAndEncrypt methods of the modified PGPLib class instance. For each new instance it has to be set explicitly again.
Example code
This example shows how to set the digital signature hashing algorithm to SHA-256:
C# example
PGPLib pgp = new PGPLib(); pgp.Hash = HashAlgorithm.SHA256; |
VB.NET code
Dim pgp As New PGPLib() pgp.Hash = HashAlgorithm.SHA256 |
Summary
This chapter discussed changing the hash function used in OpenPGP signatures created with the PGPLib class.
You may also be interested in how to change the default cipher and default compression algorithms.
