(Tcl) RSA OAEP Padding

Demonstrates how to use OAEP padding with the RSA encryption algorithm. More information about OAEP Padding.

Note: This example requires Chilkat v11.0.0 or greater.

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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]

# RSA public key in XML format:
set pubKeyXml "<RSAPublicKey><Modulus>of3im3mRgd2NLXIGoK6uYLg6jj0Ug2b42rnqa5Tbwz2ieFqMJqt+++x2oqLYGurlz49nt+7/785g3XYWqoka4u9c9zul6YubIjnBM72dQy7rEkEfbUxgjcxqXyjZFx+FpaxFUecLu688XEu+9UA42VKiCgcl+E7TrqnfeeYpNXc=</Modulus><Exponent>AQAB</Exponent></RSAPublicKey>"

set pubKey [new_CkPublicKey]

set success [CkPublicKey_LoadFromString $pubKey $pubKeyXml]
if {$success == 0} then {
    puts [CkPublicKey_lastErrorText $pubKey]
    delete_CkRsa $rsa
    delete_CkPublicKey $pubKey
    exit
}

set success [CkRsa_UsePublicKey $rsa $pubKey]
if {$success == 0} then {
    puts [CkRsa_lastErrorText $rsa]
    delete_CkRsa $rsa
    delete_CkPublicKey $pubKey
    exit
}

# To use Optimal Asymmetric Encryption Padding (OAEP) padding,
# simply set the PkcsPadding property to 0
CkRsa_put_PkcsPadding $rsa 0

# Encrypt a string and return the encrypted data base64-encoded:
CkRsa_put_EncodingMode $rsa "base64"

set plainText "RSA Encryption should be easy."

set usePrivateKey 0
set encryptedStr [CkRsa_encryptStringENC $rsa $plainText $usePrivateKey]
puts "$encryptedStr"

delete_CkRsa $rsa
delete_CkPublicKey $pubKey