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PureBasic Examples

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(PureBasic) JWE using AES Key Wrap and AES_128_CBC_HMAC_SHA_256

This example duplicates the example A.3 in RFC 7516 for JSON Web Encryption (JWE).

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

Chilkat PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJwe.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    ;  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.

    success.i
    plaintext.s = "Live long and prosper."

    jwe.i = CkJwe::ckCreate()
    If jwe.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  First build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256"}
    jweProtHdr.i = CkJsonObject::ckCreate()
    If jweProtHdr.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckAppendString(jweProtHdr,"alg","A128KW")
    CkJsonObject::ckAppendString(jweProtHdr,"enc","A128CBC-HS256")
    CkJwe::ckSetProtectedHeader(jwe,jweProtHdr)

    Debug "JWE Protected Header: " + CkJsonObject::ckEmit(jweProtHdr)
    Debug "--"

    ;  The example A.3 in RFC 7516 uses the following 128-bit AES key,
    ;  specified in JWK (JSON Web Key) format:
    ;       {"kty":"oct",
    ;        "k":"GawgguFyGrWKav7AX4VKUg"
    ;       }
    ;  This is just a way of saying: The key type ("kty") is
    ;  a bunch of octets ("k") in base64url encoding.
    ;  We can simply set the AES wrapping key like this:
    aesWrappingKey.s = "GawgguFyGrWKav7AX4VKUg"
    CkJwe::ckSetWrappingKey(jwe,0,aesWrappingKey,"base64url")

    ;  Encrypt and return the JWE:
    strJwe.s = CkJwe::ckEncrypt(jwe,plaintext,"utf-8")
    If CkJwe::ckLastMethodSuccess(jwe) <> 1
        Debug CkJwe::ckLastErrorText(jwe)
        CkJwe::ckDispose(jwe)
        CkJsonObject::ckDispose(jweProtHdr)
        ProcedureReturn
    EndIf

    ;  Show the JWE we just created:
    Debug strJwe

    ;  Decrypt the JWE that was just produced.
    ;  1) Load the JWE.
    ;  2) Set the AES wrapping key.
    ;  3) Decrypt.
    jwe2.i = CkJwe::ckCreate()
    If jwe2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkJwe::ckLoadJwe(jwe2,strJwe)
    If success <> 1
        Debug CkJwe::ckLastErrorText(jwe2)
        CkJwe::ckDispose(jwe)
        CkJsonObject::ckDispose(jweProtHdr)
        CkJwe::ckDispose(jwe2)
        ProcedureReturn
    EndIf

    ;  Set the AES wrap key.
    CkJwe::ckSetWrappingKey(jwe2,0,aesWrappingKey,"base64url")

    ;  Decrypt.
    originalPlaintext.s = CkJwe::ckDecrypt(jwe2,0,"utf-8")
    If CkJwe::ckLastMethodSuccess(jwe2) <> 1
        Debug CkJwe::ckLastErrorText(jwe2)
        CkJwe::ckDispose(jwe)
        CkJsonObject::ckDispose(jweProtHdr)
        CkJwe::ckDispose(jwe2)
        ProcedureReturn
    EndIf

    Debug "original text: "
    Debug originalPlaintext

    ;  ---------------------------------------------------------------------------------
    ;  It should also be possible to decrypt the JWE as shown in RFC 7516, Appendix A.3.7
    ;  because it was produced using the same AES Wrap key.

    sbJwe.i = CkStringBuilder::ckCreate()
    If sbJwe.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sbJwe,"eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.")
    CkStringBuilder::ckAppend(sbJwe,"6KB707dM9YTIgHtLvtgWQ8mKwboJW3of9locizkDTHzBC2IlrT1oOQ.")
    CkStringBuilder::ckAppend(sbJwe,"AxY8DCtDaGlsbGljb3RoZQ.")
    CkStringBuilder::ckAppend(sbJwe,"KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY.")
    CkStringBuilder::ckAppend(sbJwe,"U0m_YmjN04DJvceFICbCVQ")

    success = CkJwe::ckLoadJweSb(jwe2,sbJwe)
    If success <> 1
        Debug CkJwe::ckLastErrorText(jwe2)
        CkJwe::ckDispose(jwe)
        CkJsonObject::ckDispose(jweProtHdr)
        CkJwe::ckDispose(jwe2)
        CkStringBuilder::ckDispose(sbJwe)
        ProcedureReturn
    EndIf

    CkJwe::ckSetWrappingKey(jwe2,0,aesWrappingKey,"base64url")

    ;  Decrypt.
    originalPlaintext = CkJwe::ckDecrypt(jwe2,0,"utf-8")
    If CkJwe::ckLastMethodSuccess(jwe2) <> 1
        Debug CkJwe::ckLastErrorText(jwe2)
        CkJwe::ckDispose(jwe)
        CkJsonObject::ckDispose(jweProtHdr)
        CkJwe::ckDispose(jwe2)
        CkStringBuilder::ckDispose(sbJwe)
        ProcedureReturn
    EndIf

    Debug originalPlaintext


    CkJwe::ckDispose(jwe)
    CkJsonObject::ckDispose(jweProtHdr)
    CkJwe::ckDispose(jwe2)
    CkStringBuilder::ckDispose(sbJwe)


    ProcedureReturn
EndProcedure

 

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