B4X Requires Chilkat v11.0.0+

RSA Signature using Private Key from .snk File

See more RSA Examples

A .snk file (Strong Name Key file) is a file format used in the .NET ecosystem to store an RSA public/private key pair. This key pair is typically used for strong-naming assemblies, which is a process of signing .NET assemblies to ensure their integrity and to uniquely identify them.

This example loads a private key from a .snk file and creates an RSA signature.

B4X

Dim success As Boolean = False

Dim rsa As ChilkatRsa
rsa.Initialize

'  Load the .snk and return the private key as XML.
Dim xmlStr As String = rsa.SnkToXml("./test.snk")
If rsa.LastMethodSuccess = False Then
    Log(rsa.LastErrorText)
    Return
End If


Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadXml(xmlStr)
If success = False Then
    Log(privKey.LastErrorText)
    Return
End If


success = rsa.UsePrivateKey(privKey)
If success = False Then
    Log(rsa.LastErrorText)
    Return
End If


'  Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
'  Return the signature in base64 format.
rsa.EncodingMode = "base64"
rsa.Charset = "utf-8"
Dim sigBase64 As String = rsa.SignStringENC("This is the text to be hashed and signed.", "sha256")
If rsa.LastMethodSuccess = False Then
    Log(rsa.LastErrorText)
    Return
End If


Log("RSA signature as base64: " & sigBase64)