B4X Requires Chilkat v11.0.0+

RSA Sign with PKCS8 Encrypted Key

See more RSA Examples

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature. B4X

Dim success As Boolean = False

'  This example assumes the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim pkey As ChilkatPrivateKey
pkey.Initialize("pkey")

'  Load the private key from an RSA PEM file:
success = pkey.LoadPkcs8EncryptedFile("privateKey.key", "myPassword")

Dim rsa As ChilkatRsa
rsa.Initialize

'  Import the private key into the RSA object:
success = rsa.UsePrivateKey(pkey)
If success = False Then
    Log(rsa.LastErrorText)
    Return
End If


'  Return the signature in hex
rsa.EncodingMode = "hex"

Dim strData As String = "This is the string to be signed."

'  Sign the string using the sha-1 hash algorithm.
'  Other valid choices are "md2", "sha256", "sha384", "sha512",  and "md5".
Dim hexSig As String = rsa.SignStringENC(strData, "sha-1")

Log(hexSig)