Tcl Requires Chilkat v11.0.0+

RSA Signature SHA256withRSA, iso-8859-1, base64

See more RSA Examples

RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding. Tcl

load ./chilkat.dll

set success 0

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

#  This example will duplicate the following Java code:
#  
#  Signature sign = Signature.getInstance("SHA256withRSA");
#  sign.initSign(privateKey);
#  sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
#  
#  ...
#  byte[] resultado = sign.sign();
#  sello = encodeByteArrayToBase64(resultado);
#  

#  Load an RSA private key for signing.
#  You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
set privKey [new_CkPrivateKey]

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

set rsa [new_CkRsa]

CkRsa_UsePrivateKey $rsa $privKey

set originalData "This is the string to be hashed an RSA signed."

#  Indicate that we want the iso-8859-1 byte representation of the string to be signed
CkRsa_put_Charset $rsa "iso-8859-1"

#  We want the RSA signature in base64 format
CkRsa_put_EncodingMode $rsa "base64"

set sigBase64 [CkRsa_signStringENC $rsa $originalData "sha256"]
puts "$sigBase64"

delete_CkPrivateKey $privKey
delete_CkRsa $rsa