(Tcl) Duplicate openssl pkey -in private.pem -pubout -out pubkey.pem

How to output the public part of a private key: Demonstrates how to duplicate this OpenSSL command:

openssl pkey -in private.pem -pubout -out pubkey.pem

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load ./chilkat.dll

set pkey [new_CkPrivateKey]

# Load the private key from an PEM file:
set success [CkPrivateKey_LoadPemFile $pkey "private.pem"]
if {$success != 1} then {
    puts [CkPrivateKey_lastErrorText $pkey]
    delete_CkPrivateKey $pkey
    exit
}

# pubKey is a CkPublicKey
set pubKey [CkPrivateKey_GetPublicKey $pkey]
if {[CkPrivateKey_get_LastMethodSuccess $pkey] == 0} then {
    puts [CkPrivateKey_lastErrorText $pkey]
    delete_CkPrivateKey $pkey
    exit
}

set success [CkPublicKey_SavePemFile $pubKey 0 "pubKey.pem"]
if {$success != 1} then {
    puts [CkPublicKey_lastErrorText $pubKey]
    delete_CkPublicKey $pubKey

    delete_CkPrivateKey $pkey
    exit
}

puts "Success."

delete_CkPublicKey $pubKey


delete_CkPrivateKey $pkey