Tcl

Export a Private Key as Traditional PEM

Demonstrates the Chilkat PrivateKey.GetPkcs1Pem method, which exports the key as unencrypted PEM, preferring the traditional algorithm-specific representation when one exists (for example -----BEGIN RSA PRIVATE KEY-----). It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Before PKCS #8 unified key storage, each algorithm had its own PEM format — RSA PRIVATE KEY, EC PRIVATE KEY, and so on. Some older tools still expect that traditional form, and this method produces it. When you have the choice, PKCS #8 (GetPkcs8Pem) is the more interoperable modern option; use this for compatibility with software that requires the legacy layout.

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Tcl


load ./chilkat.dll

set success 0

#  Load a private key to export.
set privKey [new_CkPrivateKey]

set success [CkPrivateKey_LoadPemFile $privKey "qa_data/private.pem"]
if {$success == 0} then {
    puts [CkPrivateKey_lastErrorText $privKey]
    delete_CkPrivateKey $privKey
    exit
}

#  Export as unencrypted PEM, preferring the traditional algorithm-specific representation when
#  one exists (for example "-----BEGIN RSA PRIVATE KEY-----").
set pem [CkPrivateKey_getPkcs1Pem $privKey]
if {[CkPrivateKey_get_LastMethodSuccess $privKey] == 0} then {
    puts [CkPrivateKey_lastErrorText $privKey]
    delete_CkPrivateKey $privKey
    exit
}

puts "$pem"

delete_CkPrivateKey $privKey