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Tcl Examples

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(Tcl) Create PKCS1 RSA Signature with PEM Private Key

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set pkey [new_CkPrivateKey]

# Load the private key from an RSA PEM file:
set success [CkPrivateKey_LoadPemFile $pkey "pvkey2_rsa.pem"]

# Get the private key in XML format:
set pkeyXml [CkPrivateKey_getXml $pkey]

set rsa [new_CkRsa]

# Import the private key into the RSA component:
set success [CkRsa_ImportPrivateKey $rsa $pkeyXml]
if {[expr $success != 1]} then {
    puts [CkRsa_lastErrorText $rsa]
    delete_CkPrivateKey $pkey
    delete_CkRsa $rsa
    exit
}

# This example will sign a string, and receive the signature
# in a hex-encoded string.  Therefore, set the encoding mode
# to "hex":
CkRsa_put_EncodingMode $rsa "hex"

# If some other non-Chilkat software is going to verify
# the signature, it is important to match the byte-ordering.
# The LittleEndian property may be set to 1
# for little-endian byte ordering, 
# or 0  for big-endian byte ordering.
# Microsoft apps typically use little-endian, while
# OpenSSL and other services (such as Amazon CloudFront)
# use big-endian.
CkRsa_put_LittleEndian $rsa 0

set strData "This is the string to be signed."

# Sign the string using the sha-1 hash algorithm.
# Other valid choices are "md2", "md5", "sha256",
# "sha384", and "sha512".
set hexSig [CkRsa_signStringENC $rsa $strData "sha-1"]

puts "$hexSig"

puts "Success!"

delete_CkPrivateKey $pkey
delete_CkRsa $rsa

 

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