Tcl

RSA Decrypt using PEM

See more RSA Examples

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file. Tcl

load ./chilkat.dll

set success 0

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

set rsa [new_CkRsa]

set key [new_CkPrivateKey]

# Load an RSA private key from an unencrypted PEM file:
# (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

set success [CkPrivateKey_LoadPemFile $key "qa_data/rsa/decryptTest/priv.pem"]
if {$success == 0} then {
    puts [CkPrivateKey_lastErrorText $key]
    delete_CkRsa $rsa
    delete_CkPrivateKey $key
    exit
}

# Make the key available to the RSA object
set success [CkRsa_UsePrivateKey $rsa $key]
if {$success == 0} then {
    puts [CkRsa_lastErrorText $rsa]
    delete_CkRsa $rsa
    delete_CkPrivateKey $key
    exit
}

set encryptedStr "pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA=="

CkRsa_put_EncodingMode $rsa "base64"

set usePrivateKey 1
set decryptedStr [CkRsa_decryptStringENC $rsa $encryptedStr $usePrivateKey]

puts "Decrypted:"
puts "$decryptedStr"

delete_CkRsa $rsa
delete_CkPrivateKey $key