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DataFlex Examples

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(DataFlex) JWE Using General JWE JSON Serialization

This example duplicates the example A.4 in RFC 7516 for JSON Web Encryption (JWE).

This example demonstrates the capability for encrypting the same plaintext to multiple recipients. Two recipients are present in this example.

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Boolean iSuccess
    String sPlaintext
    Handle hoJwe
    Variant vJweProtHdr
    Handle hoJweProtHdr
RecipientHdr1    Handle hoJweRecipientHdr1
    Integer iRecipientIndex
    Variant vJweRecipientHdr2
    Handle hoJweRecipientHdr2
UnprotHdr    Handle hoJweUnprotHdr
    Handle hoSbJwk
    Variant vRsaPrivKey
    Handle hoRsaPrivKey
    Variant vRsaPubKey
    Handle hoRsaPubKey
    String sAesWrappingKey
    String sStrJwe
    Handle hoJsonTemp
2    Handle hoJwe2
    Boolean iCaseSensitive
    String sOriginalPlaintext
    Variant vSbJwe
    Handle hoSbJwe
    String sTemp1
    Boolean bTemp1

    //  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.

    Move "Live long and prosper." To sPlaintext

    Get Create (RefClass(cComChilkatJwe)) To hoJwe
    If (Not(IsComObjectCreated(hoJwe))) Begin
        Send CreateComObject of hoJwe
    End

    //  First build the JWE Protected Header: {"enc":"A128CBC-HS256"}
    Get Create (RefClass(cComChilkatJsonObject)) To hoJweProtHdr
    If (Not(IsComObjectCreated(hoJweProtHdr))) Begin
        Send CreateComObject of hoJweProtHdr
    End
    Get ComAppendString Of hoJweProtHdr "enc" "A128CBC-HS256" To iSuccess
    Get pvComObject of hoJweProtHdr to vJweProtHdr
    Get ComSetProtectedHeader Of hoJwe vJweProtHdr To iSuccess

    //  The first recipient uses the RSAES-PKCS1-v1_5 algorithm to encrypt
    //  the CEK.  The second uses AES Key Wrap to encrypt the CEK.  Key ID
    //  values are supplied for both keys.  The two JWE Per-Recipient
    //  Unprotected Header values used to represent these algorithms and key
    //  IDs are:
    // 
    //       {"alg":"RSA1_5","kid":"2011-04-29"}
    // 
    //  and
    // 
    //       {"alg":"A128KW","kid":"7"}

    Get Create (RefClass(cComChilkatJsonObject)) To hoJweRecipientHdr1
    If (Not(IsComObjectCreated(hoJweRecipientHdr1))) Begin
        Send CreateComObject of hoJweRecipientHdr1
    End
    Get ComAppendString Of hoJweRecipientHdr1 "alg" "RSA1_5" To iSuccess
    Get ComAppendString Of hoJweRecipientHdr1 "kid" "2011-04-29" To iSuccess
    Move 0 To iRecipientIndex
    Get pvComObject of hoJweRecipientHdr1 to vJweRecipientHdr1
    Get ComSetRecipientHeader Of hoJwe iRecipientIndex vJweRecipientHdr1 To iSuccess

    Get Create (RefClass(cComChilkatJsonObject)) To hoJweRecipientHdr2
    If (Not(IsComObjectCreated(hoJweRecipientHdr2))) Begin
        Send CreateComObject of hoJweRecipientHdr2
    End
    Get ComAppendString Of hoJweRecipientHdr2 "alg" "A128KW" To iSuccess
    Get ComAppendString Of hoJweRecipientHdr2 "kid" "7" To iSuccess
    Move 1 To iRecipientIndex
    Get pvComObject of hoJweRecipientHdr2 to vJweRecipientHdr2
    Get ComSetRecipientHeader Of hoJwe iRecipientIndex vJweRecipientHdr2 To iSuccess

    //  Set the Shared Unprotected Header:  {"jku":"https://server.example.com/keys.jwks"}
    Get Create (RefClass(cComChilkatJsonObject)) To hoJweUnprotHdr
    If (Not(IsComObjectCreated(hoJweUnprotHdr))) Begin
        Send CreateComObject of hoJweUnprotHdr
    End
    Get ComAppendString Of hoJweUnprotHdr "jku" "https://server.example.com/keys.jwks" To iSuccess
    Get pvComObject of hoJweUnprotHdr to vJweUnprotHdr
    Get ComSetUnprotectedHeader Of hoJwe vJweUnprotHdr To iSuccess

    //  Note: The intent of specifying a "kid" (an acronym for "Key ID") is that
    //  the software would somehow download the keys.jwks from https://server.example.com/keys.jwks,
    //  and would select the key (whatever format it may be, such as RSA, or an AES key wrap key, etc.),
    //  and then automatically use it.

    //  This example keeps the "kid" and "jku" in their respective headers, but does not actually fetch
    //  the keys from some URL.  We'll just provide the keys directly..

    //  Recipient 0 uses this RSA key:
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJwk
    If (Not(IsComObjectCreated(hoSbJwk))) Begin
        Send CreateComObject of hoSbJwk
    End
    Get ComAppend Of hoSbJwk '{"kty":"RSA",' To iSuccess
    Get ComAppend Of hoSbJwk '"n":"sXchDaQebHnPiGvyDOAT4saGEUetSyo9MKLOoWFsueri23bOdgWp4Dy1Wl' To iSuccess
    Get ComAppend Of hoSbJwk "UzewbgBHod5pcM9H95GQRV3JDXboIRROSBigeC5yjU1hGzHHyXss8UDpre" To iSuccess
    Get ComAppend Of hoSbJwk "cbAYxknTcQkhslANGRUZmdTOQ5qTRsLAt6BTYuyvVRdhS8exSZEy_c4gs_" To iSuccess
    Get ComAppend Of hoSbJwk "7svlJJQ4H9_NxsiIoLwAEk7-Q3UXERGYw_75IDrGA84-lA_-Ct4eTlXHBI" To iSuccess
    Get ComAppend Of hoSbJwk "Y2EaV7t7LjJaynVJCpkv4LKjTTAumiGUIuQhrNhZLuF_RJLqHpM2kgWFLU" To iSuccess
    Get ComAppend Of hoSbJwk '7-VTdL1VbC2tejvcI2BlMkEpk1BzBZI0KQB0GaDWFLN-aEAw3vRw",' To iSuccess
    Get ComAppend Of hoSbJwk '"e":"AQAB",' To iSuccess
    Get ComAppend Of hoSbJwk '"d":"VFCWOqXr8nvZNyaaJLXdnNPXZKRaWCjkU5Q2egQQpTBMwhprMzWzpR8Sxq' To iSuccess
    Get ComAppend Of hoSbJwk "1OPThh_J6MUD8Z35wky9b8eEO0pwNS8xlh1lOFRRBoNqDIKVOku0aZb-ry" To iSuccess
    Get ComAppend Of hoSbJwk "nq8cxjDTLZQ6Fz7jSjR1Klop-YKaUHc9GsEofQqYruPhzSA-QgajZGPbE_" To iSuccess
    Get ComAppend Of hoSbJwk "0ZaVDJHfyd7UUBUKunFMScbflYAAOYJqVIVwaYR5zWEEceUjNnTNo_CVSj" To iSuccess
    Get ComAppend Of hoSbJwk "-VvXLO5VZfCUAVLgW4dpf1SrtZjSt34YLsRarSb127reG_DUwg9Ch-Kyvj" To iSuccess
    Get ComAppend Of hoSbJwk 'T1SkHgUWRVGcyly7uvVGRSDwsXypdrNinPA4jlhoNdizK2zF2CWQ",' To iSuccess
    Get ComAppend Of hoSbJwk '"p":"9gY2w6I6S6L0juEKsbeDAwpd9WMfgqFoeA9vEyEUuk4kLwBKcoe1x4HG68' To iSuccess
    Get ComAppend Of hoSbJwk "ik918hdDSE9vDQSccA3xXHOAFOPJ8R9EeIAbTi1VwBYnbTp87X-xcPWlEP" To iSuccess
    Get ComAppend Of hoSbJwk 'krdoUKW60tgs1aNd_Nnc9LEVVPMS390zbFxt8TN_biaBgelNgbC95sM",' To iSuccess
    Get ComAppend Of hoSbJwk '"q":"uKlCKvKv_ZJMVcdIs5vVSU_6cPtYI1ljWytExV_skstvRSNi9r66jdd9-y' To iSuccess
    Get ComAppend Of hoSbJwk "BhVfuG4shsp2j7rGnIio901RBeHo6TPKWVVykPu1iYhQXw1jIABfw-MVsN" To iSuccess
    Get ComAppend Of hoSbJwk '-3bQ76WLdt2SDxsHs7q7zPyUyHXmps7ycZ5c72wGkUwNOjYelmkiNS0",' To iSuccess
    Get ComAppend Of hoSbJwk '"dp":"w0kZbV63cVRvVX6yk3C8cMxo2qCM4Y8nsq1lmMSYhG4EcL6FWbX5h9yuv' To iSuccess
    Get ComAppend Of hoSbJwk "ngs4iLEFk6eALoUS4vIWEwcL4txw9LsWH_zKI-hwoReoP77cOdSL4AVcra" To iSuccess
    Get ComAppend Of hoSbJwk 'Hawlkpyd2TWjE5evgbhWtOxnZee3cXJBkAi64Ik6jZxbvk-RR3pEhnCs",' To iSuccess
    Get ComAppend Of hoSbJwk '"dq":"o_8V14SezckO6CNLKs_btPdFiO9_kC1DsuUTd2LAfIIVeMZ7jn1Gus_Ff' To iSuccess
    Get ComAppend Of hoSbJwk "7B7IVx3p5KuBGOVF8L-qifLb6nQnLysgHDh132NDioZkhH7mI7hPG-PYE_" To iSuccess
    Get ComAppend Of hoSbJwk 'odApKdnqECHWw0J-F0JWnUd6D2B_1TvF9mXA2Qx-iGYn8OVV1Bsmp6qU",' To iSuccess
    Get ComAppend Of hoSbJwk '"qi":"eNho5yRBEBxhGBtQRww9QirZsB66TrfFReG_CcteI1aCneT0ELGhYlRlC' To iSuccess
    Get ComAppend Of hoSbJwk "tUkTRclIfuEPmNsNDPbLoLqqCVznFbvdB7x-Tl-m0l_eFTj2KiqwGqE9PZ" To iSuccess
    Get ComAppend Of hoSbJwk 'B9nNTwMVvH3VRRSLWACvPnSiwP8N5Usy-WRXS-V7TbpxIhvepTfE0NNo"' To iSuccess
    Get ComAppend Of hoSbJwk "}" To iSuccess

    //  Load this JWK into a Chilkat private key object.
    Get Create (RefClass(cComChilkatPrivateKey)) To hoRsaPrivKey
    If (Not(IsComObjectCreated(hoRsaPrivKey))) Begin
        Send CreateComObject of hoRsaPrivKey
    End
    Get ComGetAsString Of hoSbJwk To sTemp1
    Get ComLoadJwk Of hoRsaPrivKey sTemp1 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRsaPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Get the public key for encryption.  (The RSA private key is used for decryption.)
    Get ComGetPublicKey Of hoRsaPrivKey To vRsaPubKey
    If (IsComObject(vRsaPubKey)) Begin
        Get Create (RefClass(cComChilkatPublicKey)) To hoRsaPubKey
        Set pvComObject Of hoRsaPubKey To vRsaPubKey
    End
    Move 0 To iRecipientIndex
    Get ComSetPublicKey Of hoJwe iRecipientIndex vRsaPubKey To iSuccess
    Send Destroy of hoRsaPubKey

    //  Recipient 1 uses AES Key Wrap
    Move "GawgguFyGrWKav7AX4VKUg" To sAesWrappingKey
    Move 1 To iRecipientIndex
    Get ComSetWrappingKey Of hoJwe iRecipientIndex sAesWrappingKey "base64url" To iSuccess

    //  OK.. everything has been specified.
    //  Now encrypt.  Chilkat will use the general JSON serialization because it is only
    //  possible serializationto use given there are multiple recipients.
    Get ComEncrypt Of hoJwe sPlaintext "utf-8" To sStrJwe
    Get ComLastMethodSuccess Of hoJwe To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoJwe To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  The strJwe is in the most compact form possible (a single line).
    //  Let's load it into a JSON object and examine in a non-compact pretty-printed format:
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonTemp
    If (Not(IsComObjectCreated(hoJsonTemp))) Begin
        Send CreateComObject of hoJsonTemp
    End
    Get ComLoad Of hoJsonTemp sStrJwe To iSuccess
    Set ComEmitCompact Of hoJsonTemp To False
    Get ComEmit Of hoJsonTemp To sTemp1
    Showln sTemp1

    //  The JWE looks like this:
    //  (Note: Because of random values used in the encryption process, your encrypted results will be different.)

    //  	{
    //  	  "protected": "eyJlbmMiOiJBMTI4Q0JDLUhTMjU2In0",
    //  	  "unprotected": {
    //  	    "jku": "https://server.example.com/keys.jwks"
    //  	  },
    //  	  "recipients": [
    //  	    {
    //  	      "header": {
    //  	        "alg": "RSA1_5",
    //  	        "kid": "2011-04-29"
    //  	      },
    //  	      "encrypted_key": "WlUggejR-vStJVNKgjG2mQrVv74aga1FFutT8E-n-yJEOTsOVnGjhj1NW_Snd9DqHAhFrc7NEvKCFplKWGnusBZxxjm1JpdUa0MIpkGmncJHQQdfm21vcbEUbDmfqVY79SnEis3tih1D3qmyp_Bxti4byDAHJIOJv_cj0Sx8oHZzgGtOLjtHsydyo1MtBIqI0w86i_uhUuraihZ3ngj67YZ6uqpR6lulkPIVohfF3oJ0D3Ay_XOCHWlHYkTg6VZsa0FDrPtfB2pG3TxTBPwI4IMj5uF_D3zrg51dCYKU1Gah71ujLaXRE5q9XF7oOknxiWQuWc7Ox8JP03lSx-DiVA"
    //  	    },
    //  	    {
    //  	      "header": {
    //  	        "alg": "A128KW",
    //  	        "kid": "7"
    //  	      },
    //  	      "encrypted_key": "8diBP2aUUB_Jl5WxCuMJLN6HsppE3rhSjcecee0fBcwB31zbPAVejQ"
    //  	    }
    //  	  ],
    //  	  "iv": "JqahFKx5Z8SFT_LnkfOq0Q",
    //  	  "ciphertext": "YcSdjlszsaY1ADcs4Vw85H_WoAqnkDIJaJsTkmCj05s",
    //  	  "tag": "G3KF2CZ-DMhm0cqUbhJKMA"
    //  	}

    //  To decrypt, we don't need both recipient keys.  We can decrypt with one key or the other.
    //  The FindRecipient method can be used to find a particular recipient index.

    //  First, load the JWE..
    Get Create (RefClass(cComChilkatJwe)) To hoJwe2
    If (Not(IsComObjectCreated(hoJwe2))) Begin
        Send CreateComObject of hoJwe2
    End
    Get ComLoadJwe Of hoJwe2 sStrJwe To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoJwe2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Let's say we have the AES key wrap key, and we know the "kid" equals "7".
    Move False To iCaseSensitive
    Get ComFindRecipient Of hoJwe2 "kid" "7" iCaseSensitive To iRecipientIndex
    If (iRecipientIndex < 0) Begin
        Showln "Unable to find recipient with kid=7"
        Procedure_Return
    End

    //  Set the AES wrap key for the recipient index.
    Get ComSetWrappingKey Of hoJwe2 iRecipientIndex sAesWrappingKey "base64url" To iSuccess

    //  Decrypt
    Get ComDecrypt Of hoJwe2 iRecipientIndex "utf-8" To sOriginalPlaintext
    Get ComLastMethodSuccess Of hoJwe2 To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoJwe2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "original text decrypted with AES key wrap key: "
    Showln sOriginalPlaintext

    //  Now, let's do the same with the RSA private key:
    Get ComFindRecipient Of hoJwe2 "kid" "2011-04-29" iCaseSensitive To iRecipientIndex
    If (iRecipientIndex < 0) Begin
        Showln "Unable to find recipient with kid=2011-04-29"
        Procedure_Return
    End

    //  Set the RSA private key for the recipient index.
    Get pvComObject of hoRsaPrivKey to vRsaPrivKey
    Get ComSetPrivateKey Of hoJwe2 iRecipientIndex vRsaPrivKey To iSuccess

    //  Decrypt
    Get ComDecrypt Of hoJwe2 iRecipientIndex "utf-8" To sOriginalPlaintext
    Get ComLastMethodSuccess Of hoJwe2 To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoJwe2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "original text decrypted with RSA private key: "
    Showln sOriginalPlaintext

    //  ---------------------------------------------------------------------------------
    //  It should also be possible to decrypt the JWE as shown in RFC 7516, Appendix A.4.7
    //  because it was produced using the same keys.

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJwe
    If (Not(IsComObjectCreated(hoSbJwe))) Begin
        Send CreateComObject of hoSbJwe
    End
    Get ComAppend Of hoSbJwe "{" To iSuccess
    Get ComAppend Of hoSbJwe '"protected":' To iSuccess
    Get ComAppend Of hoSbJwe '"eyJlbmMiOiJBMTI4Q0JDLUhTMjU2In0",' To iSuccess
    Get ComAppend Of hoSbJwe '"unprotected":' To iSuccess
    Get ComAppend Of hoSbJwe '{"jku":"https://server.example.com/keys.jwks"},' To iSuccess
    Get ComAppend Of hoSbJwe '"recipients":[' To iSuccess
    Get ComAppend Of hoSbJwe '{"header":' To iSuccess
    Get ComAppend Of hoSbJwe '{"alg":"RSA1_5","kid":"2011-04-29"},' To iSuccess
    Get ComAppend Of hoSbJwe '"encrypted_key":' To iSuccess
    Get ComAppend Of hoSbJwe '"UGhIOguC7IuEvf_NPVaXsGMoLOmwvc1GyqlIKOK1nN94nHPoltGRhWhw7Zx0-' To iSuccess
    Get ComAppend Of hoSbJwe "kFm1NJn8LE9XShH59_i8J0PH5ZZyNfGy2xGdULU7sHNF6Gp2vPLgNZ__deLKx" To iSuccess
    Get ComAppend Of hoSbJwe "GHZ7PcHALUzoOegEI-8E66jX2E4zyJKx-YxzZIItRzC5hlRirb6Y5Cl_p-ko3" To iSuccess
    Get ComAppend Of hoSbJwe "YvkkysZIFNPccxRU7qve1WYPxqbb2Yw8kZqa2rMWI5ng8OtvzlV7elprCbuPh" To iSuccess
    Get ComAppend Of hoSbJwe "cCdZ6XDP0_F8rkXds2vE4X-ncOIM8hAYHHi29NX0mcKiRaD0-D-ljQTP-cFPg" To iSuccess
    Get ComAppend Of hoSbJwe 'wCp6X-nZZd9OHBv-B3oWh2TbqmScqXMR4gp_A"},' To iSuccess
    Get ComAppend Of hoSbJwe '{"header":' To iSuccess
    Get ComAppend Of hoSbJwe '{"alg":"A128KW","kid":"7"},' To iSuccess
    Get ComAppend Of hoSbJwe '"encrypted_key":' To iSuccess
    Get ComAppend Of hoSbJwe '"6KB707dM9YTIgHtLvtgWQ8mKwboJW3of9locizkDTHzBC2IlrT1oOQ"}],' To iSuccess
    Get ComAppend Of hoSbJwe '"iv":' To iSuccess
    Get ComAppend Of hoSbJwe '"AxY8DCtDaGlsbGljb3RoZQ",' To iSuccess
    Get ComAppend Of hoSbJwe '"ciphertext":' To iSuccess
    Get ComAppend Of hoSbJwe '"KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY",' To iSuccess
    Get ComAppend Of hoSbJwe '"tag":' To iSuccess
    Get ComAppend Of hoSbJwe '"Mz-VPPyU4RlcuYv1IwIvzw"' To iSuccess
    Get ComAppend Of hoSbJwe "}" To iSuccess

    Get pvComObject of hoSbJwe to vSbJwe
    Get ComLoadJweSb Of hoJwe2 vSbJwe To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoJwe2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  We can decrypt with either key.  Let's use the AES key wrap key...
    Get ComFindRecipient Of hoJwe2 "kid" "7" iCaseSensitive To iRecipientIndex
    If (iRecipientIndex < 0) Begin
        Showln "Unable to find recipient with kid=7"
        Procedure_Return
    End

    //  Set the AES wrap key for the recipient index.
    Get ComSetWrappingKey Of hoJwe2 iRecipientIndex sAesWrappingKey "base64url" To iSuccess

    //  Decrypt
    Get ComDecrypt Of hoJwe2 iRecipientIndex "utf-8" To sOriginalPlaintext
    Get ComLastMethodSuccess Of hoJwe2 To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoJwe2 To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "original text decrypted from published JWE, with AES key wrap key: "
    Showln sOriginalPlaintext

    //  The output:

    //  original text decrypted with AES key wrap key:
    //  Live long and prosper.
    //  original text decrypted with RSA private key:
    //  Live long and prosper.
    //  original text decrypted from published JWE, with AES key wrap key:
    //  Live long and prosper.


End_Procedure

 

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