Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3/4TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

VB.NET UWP/WinRT Examples

Web API Categories

ASN.1
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
Geolocation
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text

HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
REST
REST Misc
RSA Encryption
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(VB.NET UWP/WinRT) Duplicating OpenSSL rsautl (creating RSA signatures)

Demonstrates how to duplicate OpenSSL rsautil RSA signatures.

The Chilkat RSA component's methods for creating RSA signatures (SignBytes, SignBytesENC, SignString, and SignStringENC) are very different from OpenSSL's rsautl command. First, we'll explain what Chilkat's signing methods do, and then what OpenSSL's rsautl does. New signing methods have been added to Chilkat RSA to duplicate OpenSSL rsautl: OpenSslSignBytes, OpenSslSignBytesENC, OpenSslSignString, and OpenSslSignStringENC.

Here's what Chilkat's RSA Sign* methods do:
(Note: Chilkat RSA's Sign* methods generate signatures according to RSA Laboratories' "PKCS #1 v2.0: RSA Cryptography Standard".)

  1. Input data is hashed using the hashing algorithm specified.
  2. The hash is padded using either PKCS1 v1.5 or PKCS1 PSS padding. PKCS v1.5 involves encoding to ASN.1 before padding.
  3. The padded hash is finally RSA signed (i.e. modular exponentiation) and the signature is returned.

OpenSSL rsautl is very different. Here's what it does:

  1. The input data is not hashed. It must be a small enough amount of data such that it can be padded and signed. PKCS v1.5 padding is always used. The data is not ASN.1 encoded before padding.
  2. The PKCS v1.5 padded data is RSA signed and the signature is returned.
The new OpenSsl* methods are designed to duplicate OpenSSL's rsautil signature functionality.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

Dim pkey As New Chilkat.PrivateKey

' Load the private key from an RSA PEM file:
Dim success As Boolean = pkey.LoadPemFile("private.pem")
If (success <> True) Then
    Debug.WriteLine(pkey.LastErrorText)
    Exit Sub
End If


Dim pkeyXml As String
' Get the private key in XML format:
pkeyXml = pkey.GetXml()

Dim rsa As New Chilkat.Rsa

' Import the private key into the RSA component:
success = rsa.ImportPrivateKey(pkeyXml)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


' This example will sign a string, and receive the signature
' in a hex-encoded string.  Therefore, set the encoding mode
' to "hex":
rsa.EncodingMode = "hex"

Dim strData As String = "secret"

' Create an OpenSSL style signature:
Dim hexSig As String = rsa.OpenSslSignStringENC(strData)

Debug.WriteLine(hexSig)

' Recover the data using the corresponding public key:
Dim pubkey As New Chilkat.PublicKey

' Load the public key from a PEM file:
success = pubkey.LoadOpenSslPemFile("public.pem")
If (success <> True) Then
    Debug.WriteLine(pubkey.LastErrorText)
    Exit Sub
End If


Dim pubkeyXml As String
' Get the public key in XML format:
pubkeyXml = pubkey.GetXml()

Dim rsa2 As New Chilkat.Rsa

' Import the public key into the RSA component:
success = rsa2.ImportPublicKey(pubkeyXml)
If (success <> True) Then
    Debug.WriteLine(rsa2.LastErrorText)
    Exit Sub
End If


rsa2.EncodingMode = "hex"

' Recover the original data.
Dim originalData As String
originalData = rsa2.OpenSslVerifyStringENC(hexSig)

Debug.WriteLine(originalData)

 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.