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(Tcl) JWE with DEFLATE Compression

Demonstrates how to DEFLATE ("zip") compress the JWE payload prior to encryption.

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

#  Note: This example requires Chilkat v9.5.0.66 or greater.

#  Create some plaintext to be encrypted.
#  This example will demonstrate with and without DEFLATE (zip) compression.
set sbPlainText [new_CkStringBuilder]

set bCrLf 1
set line "Live long and prosper."
CkStringBuilder_AppendLine $sbPlainText $line $bCrLf
CkStringBuilder_AppendLine $sbPlainText $line $bCrLf
CkStringBuilder_AppendLine $sbPlainText $line $bCrLf
CkStringBuilder_AppendLine $sbPlainText $line $bCrLf

#  The text to be encrypted:
puts [CkStringBuilder_getAsString $sbPlainText]

set jwe [new_CkJwe]

#  Build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256","zip":"DEF"}
#  The "zip":"DEF" parameter indicates that the plaintext payload should
#  be compressed prior to encryption.
set jweProtHdr [new_CkJsonObject]

CkJsonObject_AppendString $jweProtHdr "alg" "A128KW"
CkJsonObject_AppendString $jweProtHdr "enc" "A128CBC-HS256"
CkJsonObject_AppendString $jweProtHdr "zip" "DEF"
CkJwe_SetProtectedHeader $jwe $jweProtHdr

#  Set the AES key wrap key:
set aesWrappingKey "GawgguFyGrWKav7AX4VKUg"
CkJwe_SetWrappingKey $jwe 0 $aesWrappingKey "base64url"

#  Encrypt and return the JWE in sbJweCompressed:
set sbJweCompressed [new_CkStringBuilder]

set success [CkJwe_EncryptSb $jwe $sbPlainText "utf-8" $sbJweCompressed]
if {[expr $success != 1]} then {
    puts [CkJwe_lastErrorText $jwe]
    delete_CkStringBuilder $sbPlainText
    delete_CkJwe $jwe
    delete_CkJsonObject $jweProtHdr
    delete_CkStringBuilder $sbJweCompressed
    exit
}

#  Show the compressed JWE:
puts [CkStringBuilder_getAsString $sbJweCompressed]
puts "size of compressed JWE: [CkStringBuilder_get_Length $sbJweCompressed]"

#  Now create a JWE without compression.
CkJsonObject_Delete $jweProtHdr "zip"
#  Make sure to update the shared protected header:
CkJwe_SetProtectedHeader $jwe $jweProtHdr

set sbJweUncompressed [new_CkStringBuilder]

set success [CkJwe_EncryptSb $jwe $sbPlainText "utf-8" $sbJweUncompressed]
if {[expr $success != 1]} then {
    puts [CkJwe_lastErrorText $jwe]
    delete_CkStringBuilder $sbPlainText
    delete_CkJwe $jwe
    delete_CkJsonObject $jweProtHdr
    delete_CkStringBuilder $sbJweCompressed
    delete_CkStringBuilder $sbJweUncompressed
    exit
}

#  Show the uncompressed JWE:
puts [CkStringBuilder_getAsString $sbJweUncompressed]
puts "size of uncompressed JWE: [CkStringBuilder_get_Length $sbJweUncompressed]"

#  Decrypting is the same whether compression is used or not.
#  The "zip" header in the JWE indicates that the payload should be
#  automatically decompressed (inflated) after decrypting.
set jwe2 [new_CkJwe]

set success [CkJwe_LoadJweSb $jwe2 $sbJweCompressed]
if {[expr $success != 1]} then {
    puts [CkJwe_lastErrorText $jwe2]
    delete_CkStringBuilder $sbPlainText
    delete_CkJwe $jwe
    delete_CkJsonObject $jweProtHdr
    delete_CkStringBuilder $sbJweCompressed
    delete_CkStringBuilder $sbJweUncompressed
    delete_CkJwe $jwe2
    exit
}

#  Set the AES wrap key.
CkJwe_SetWrappingKey $jwe2 0 $aesWrappingKey "base64url"

#  Decrypt (also automatically decompresses).
set sbOriginalText [new_CkStringBuilder]

set success [CkJwe_DecryptSb $jwe2 0 "utf-8" $sbOriginalText]
if {[expr $success != 1]} then {
    puts [CkJwe_lastErrorText $jwe2]
    delete_CkStringBuilder $sbPlainText
    delete_CkJwe $jwe
    delete_CkJsonObject $jweProtHdr
    delete_CkStringBuilder $sbJweCompressed
    delete_CkStringBuilder $sbJweUncompressed
    delete_CkJwe $jwe2
    delete_CkStringBuilder $sbOriginalText
    exit
}

puts "original text from compressed JWE: "
puts [CkStringBuilder_getAsString $sbOriginalText]

#  -----------------------------------------------------------
#  Do the same with the uncompressed JWE

set success [CkJwe_LoadJweSb $jwe2 $sbJweUncompressed]
if {[expr $success != 1]} then {
    puts [CkJwe_lastErrorText $jwe2]
    delete_CkStringBuilder $sbPlainText
    delete_CkJwe $jwe
    delete_CkJsonObject $jweProtHdr
    delete_CkStringBuilder $sbJweCompressed
    delete_CkStringBuilder $sbJweUncompressed
    delete_CkJwe $jwe2
    delete_CkStringBuilder $sbOriginalText
    exit
}

#  Set the AES wrap key.
CkJwe_SetWrappingKey $jwe2 0 $aesWrappingKey "base64url"

#  Decrypt.
CkStringBuilder_Clear $sbOriginalText
set success [CkJwe_DecryptSb $jwe2 0 "utf-8" $sbOriginalText]
if {[expr $success != 1]} then {
    puts [CkJwe_lastErrorText $jwe2]
    delete_CkStringBuilder $sbPlainText
    delete_CkJwe $jwe
    delete_CkJsonObject $jweProtHdr
    delete_CkStringBuilder $sbJweCompressed
    delete_CkStringBuilder $sbJweUncompressed
    delete_CkJwe $jwe2
    delete_CkStringBuilder $sbOriginalText
    exit
}

puts "original text from uncompressed JWE: "
puts [CkStringBuilder_getAsString $sbOriginalText]

#  ------------------------------------------------
#  The output of this example is:
#  (Note: Your output data will be different because the content encryption key is randomly generated.)

#  eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiemlwIjoiREVGIn0.xuW-pEAIdEUFnk10m8ocursvktO8Of9ByCCAt6LgKkkOtCWCUn1kQw.zpGj-9WVni3cQxyOuZbcGA.0hzP1myua3oYpUHwCIY_3edBUREbUpLaX6wYuJduOdI.Ppc6aEO3y3B8BJ1FKMPjlA
#  size of compressed JWE: 212
#  eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.N4KeyC7nnSFkieJOyE24_zKeuV_m7v5UKoJb1TgV4Yc_r2RzUPNvyA.6AEdyXSCKx-iMmUJyypSLg.QpixfyrwhGpmwUDp623viik4smPav7vwPLiC2r-V-jwnSfEH3mxWu6DbrIz3mixaqATwynmEBzVPxvS9jTXpSAGCnniib4_0WoPl3r_wF5tlsKOEe--jpNso-DKd1Tp8jJxj3JkFWt3IRnUUKGj17g.sBfDwFc5fzpaI-UW8-SW4g
#  size of uncompressed JWE: 303
#  original text from compressed JWE:
#  Live long and prosper.
#  Live long and prosper.
#  Live long and prosper.
#  Live long and prosper.
# 
#  original text from uncompressed JWE:
#  Live long and prosper.
#  Live long and prosper.
#  Live long and prosper.
#  Live long and prosper.
# 

delete_CkStringBuilder $sbPlainText
delete_CkJwe $jwe
delete_CkJsonObject $jweProtHdr
delete_CkStringBuilder $sbJweCompressed
delete_CkStringBuilder $sbJweUncompressed
delete_CkJwe $jwe2
delete_CkStringBuilder $sbOriginalText

 

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