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

Tcl Examples

ASN.1
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
Facebook
FileAccess
Firebase
GMail REST API
GeoOp
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Google Sheets
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)
Jira
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
PayPal
Peoplevox
QuickBooks
REST
REST Misc
RSA Encryption
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Shopify
Socket/SSL/TLS
Spider
Stream
Stripe
SugarCRM
Tar Archive
Twitter
Upload
VoiceBase
Walmart
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Xero
Zip
curl
eBay

 

 

 

(Tcl) Encrypt a file to a PKCS7 encrypted message using multiple certificates from different users

Demonstrates how to encrypt a file to a PKCS7 encrypted message using multiple certificates from different users. Any one of the users can decrypt using his/her own certificate + private key.

Note: When doing public key encryption, it is the public key that is used to encrypt. The private key is required for decryption.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  This example requires the Chilkat Crypt API to have been previously unlocked.
#  See Unlock Chilkat Crypt for sample code.

set crypt [new_CkCrypt2]

#  Tell the crypt object to use 3 certificates.
#  Do this by calling AddEncryptCert for each certificate.

#  Load a digital certificate.
#  We don't need the private key for encryption.
#  Only the public key is needed (which is included in a certificate).
set cert1 [new_CkCert]

set success [CkCert_LoadFromFile $cert1 "qa_data/user1/cert_user1.pem"]
#  Assume success for the example, but make sure your application checks for success/failure...
CkCrypt2_AddEncryptCert $crypt $cert1

set cert2 [new_CkCert]

set success [CkCert_LoadFromFile $cert2 "qa_data/user2/cert_user2.pem"]
CkCrypt2_AddEncryptCert $crypt $cert2

set cert3 [new_CkCert]

set success [CkCert_LoadFromFile $cert3 "qa_data/user3/cert_user3.pem"]
CkCrypt2_AddEncryptCert $crypt $cert3

#  Indicate that we want PKI encryption (i.e. public-key infrastructure)
#  to produce a CMS message (Cryptographic Message Syntax/PKCS7),
#  that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the
#  bulk encryption.
CkCrypt2_put_CryptAlgorithm $crypt "pki"
CkCrypt2_put_Pkcs7CryptAlg $crypt "aes"
CkCrypt2_put_KeyLength $crypt 128
CkCrypt2_put_OaepHash $crypt "sha256"
CkCrypt2_put_OaepPadding $crypt 1

#  Load the file to be encrypted...
set fileData [new_CkBinData]

set success [CkBinData_LoadFile $fileData "qa_data/jpg/penguins.jpg"]
#  Your app should check for success/failure..

#  Encrypt the data.  The contents of the fileData object are replaced with the PKCS7 encrypted message.
set success [CkCrypt2_EncryptBd $crypt $fileData]
if {[expr $success != 1]} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert1
    delete_CkCert $cert2
    delete_CkCert $cert3
    delete_CkBinData $fileData
    exit
}

#  Save the PKCS7 encrypted message to a file..
set success [CkBinData_WriteFile $fileData "qa_output/pkcs7_encrypted.p7"]

#  Now indicate that the PKCS7 output is to be returned in the base64 encoding.
CkCrypt2_put_EncodingMode $crypt "base64"

puts "OK."

delete_CkCrypt2 $crypt
delete_CkCert $cert1
delete_CkCert $cert2
delete_CkCert $cert3
delete_CkBinData $fileData

 

© 2000-2016 Chilkat Software, Inc. All Rights Reserved.