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(Xojo Plugin) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat
The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
  1. Creates a SHA256 digest of the contents of the input file
  2. Signs the SHA256 digest using the private key.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

Dim success As Boolean

Dim pkey As New Chilkat.PrivateKey

//  Load the private key from an PEM file:
success = pkey.LoadPemFile("private.pem")
If (success <> True) Then
    System.DebugLog(pkey.LastErrorText)
    Return
End If

//  Load the file to be signed.
Dim fac As New Chilkat.FileAccess
Dim inData As MemoryBlock
inData = fac.ReadEntireFile("in.dat")

Dim rsa As New Chilkat.Rsa

//  Any string argument automatically begins the 30-day trial.
success = rsa.UnlockComponent("Anything for 30-day trial")
If (success <> True) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

//  Import the private key into the RSA component:
success = rsa.ImportPrivateKeyObj(pkey)
If (success <> True) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

//  OpenSSL uses big-endian.
rsa.LittleEndian = False

Dim sigBytes As MemoryBlock
sigBytes = rsa.SignBytes(inData,"sha256")
If (rsa.LastMethodSuccess <> True) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

//  Save the binary signature to a file.
success = fac.WriteEntireFile("signature.sig",sigBytes)
If (success <> True) Then
    System.DebugLog(fac.LastErrorText)
    Return
End If

System.DebugLog("Success.")

 

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