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Tcl Examples

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(Tcl) Encrypt File to PKCS7 .p7m

Tcl example to public-key encrypt a file creating a PKCS#7 .p7m file as output. Also demonstrates how to decrypt the .p7m to recover the original file.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set crypt [new_CkCrypt2]

#  Any string argument automatically begins the 30-day trial.
set success [CkCrypt2_UnlockComponent $crypt "30-day trial"]
if {[expr $success != 1]} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    exit
}

#  Indicate the public-key encryption is to be used.
#  Do this by setting the encryption algorithm equal
#  to "PKI" (an acroynm for public-key infrastructure).
CkCrypt2_put_CryptAlgorithm $crypt "PKI"

#  Indicate the inner symmetric encryption algorithm to be used.
#  possible values are "aes", "des", "3des", and "rc2".
#  For this example, we'll use 256-bit AES encryption.
CkCrypt2_put_Pkcs7CryptAlg $crypt "aes"
CkCrypt2_put_KeyLength $crypt 256

#  To encrypt, only a certificate w/ public key is needed.
#  (The certificate w/ private key is required for decryption.)

#  The LoadFromFile method can load virtually any certificate format:
#  1. DER encoded binary X.509 (.CER)
#  2. Base-64 encoded X.509 (.CER)
#  3. Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B)
#  4. PEM format
set encryptCert [new_CkCert]

set success [CkCert_LoadFromFile $encryptCert "/Users/chilkat/testData/cer/acme.cer"]
if {[expr $success != 1]} then {
    puts [CkCert_lastErrorText $encryptCert]
    delete_CkCrypt2 $crypt
    delete_CkCert $encryptCert
    exit
}

#  Tell the crypt object to use the certificate for encrypting:
CkCrypt2_AddEncryptCert $crypt $encryptCert

#  Encrypt a file, producing a .p7m as output.
#  The input file is unchanged, the output .p7m contains the encrypted
#  contents of the input file.
set inFile "/Users/chilkat/testData/pdf/sample.pdf"
set outFile "/Users/chilkat/testData/p7m/sample.pdf.p7m"
set success [CkCrypt2_CkEncryptFile $crypt $inFile $outFile]
if {[expr $success != 1]} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $encryptCert
    exit
}

#  For demonstration purposes, a different instance of the object will be used
#  for decryption.
set decrypt [new_CkCrypt2]

#  To decrypt, the certificate w/ private key is required.  A PFX (also known
#  as PKCS#12) is a common secure container for certs and private keys.
set pfxFilename "/Users/chilkat/testData/pfx/acme.pfx"
set pfxPassword "secret"

#  Tell the component to look in the PFX file for certs and private keys.
set success [CkCrypt2_AddPfxSourceFile $decrypt $pfxFilename $pfxPassword]
if {[expr $success != 1]} then {
    puts [CkCrypt2_lastErrorText $decrypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $encryptCert
    delete_CkCrypt2 $decrypt
    exit
}

#  Tell the decrypt object that PKI (public key encryption) is to be used
#  for decryptiong.
CkCrypt2_put_CryptAlgorithm $decrypt "PKI"
#  There is no need to set the Pkcs7Alg or KeyLength because this information
#  is contained within the .p7m

#  Decrypt the .p7m
set inFile "/Users/chilkat/testData/p7m/sample.pdf.p7m"
set outFile "/Users/chilkat/testData/pdf/recovered.pdf"
set success [CkCrypt2_CkDecryptFile $decrypt $inFile $outFile]
if {[expr $success == 0]} then {
    puts [CkCrypt2_lastErrorText $decrypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $encryptCert
    delete_CkCrypt2 $decrypt
    exit
}

puts "Success!"

delete_CkCrypt2 $crypt
delete_CkCert $encryptCert
delete_CkCrypt2 $decrypt

 

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