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(Go) JWE with DEFLATE CompressionDemonstrates how to DEFLATE ("zip") compress the JWE payload prior to encryption. Note: This example requires Chilkat v9.5.0.66 or greater.
// 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. var success bool // Create some plaintext to be encrypted. // This example will demonstrate with and without DEFLATE (zip) compression. sbPlainText := chilkat.NewStringBuilder() bCrLf := true line := "Live long and prosper." sbPlainText.AppendLine(line,bCrLf) sbPlainText.AppendLine(line,bCrLf) sbPlainText.AppendLine(line,bCrLf) sbPlainText.AppendLine(line,bCrLf) // The text to be encrypted: fmt.Println(*sbPlainText.GetAsString()) jwe := chilkat.NewJwe() // 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. jweProtHdr := chilkat.NewJsonObject() jweProtHdr.AppendString("alg","A128KW") jweProtHdr.AppendString("enc","A128CBC-HS256") jweProtHdr.AppendString("zip","DEF") jwe.SetProtectedHeader(jweProtHdr) // Set the AES key wrap key: aesWrappingKey := "GawgguFyGrWKav7AX4VKUg" jwe.SetWrappingKey(0,aesWrappingKey,"base64url") // Encrypt and return the JWE in sbJweCompressed: sbJweCompressed := chilkat.NewStringBuilder() success = jwe.EncryptSb(sbPlainText,"utf-8",sbJweCompressed) if success != true { fmt.Println(jwe.LastErrorText()) sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() return } // Show the compressed JWE: fmt.Println(*sbJweCompressed.GetAsString()) fmt.Println("size of compressed JWE: ", sbJweCompressed.Length()) // Now create a JWE without compression. jweProtHdr.Delete("zip") // Make sure to update the shared protected header: jwe.SetProtectedHeader(jweProtHdr) sbJweUncompressed := chilkat.NewStringBuilder() success = jwe.EncryptSb(sbPlainText,"utf-8",sbJweUncompressed) if success != true { fmt.Println(jwe.LastErrorText()) sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() sbJweUncompressed.DisposeStringBuilder() return } // Show the uncompressed JWE: fmt.Println(*sbJweUncompressed.GetAsString()) fmt.Println("size of uncompressed JWE: ", sbJweUncompressed.Length()) // 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. jwe2 := chilkat.NewJwe() success = jwe2.LoadJweSb(sbJweCompressed) if success != true { fmt.Println(jwe2.LastErrorText()) sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() sbJweUncompressed.DisposeStringBuilder() jwe2.DisposeJwe() return } // Set the AES wrap key. jwe2.SetWrappingKey(0,aesWrappingKey,"base64url") // Decrypt (also automatically decompresses). sbOriginalText := chilkat.NewStringBuilder() success = jwe2.DecryptSb(0,"utf-8",sbOriginalText) if success != true { fmt.Println(jwe2.LastErrorText()) sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() sbJweUncompressed.DisposeStringBuilder() jwe2.DisposeJwe() sbOriginalText.DisposeStringBuilder() return } fmt.Println("original text from compressed JWE: ") fmt.Println(*sbOriginalText.GetAsString()) // ----------------------------------------------------------- // Do the same with the uncompressed JWE success = jwe2.LoadJweSb(sbJweUncompressed) if success != true { fmt.Println(jwe2.LastErrorText()) sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() sbJweUncompressed.DisposeStringBuilder() jwe2.DisposeJwe() sbOriginalText.DisposeStringBuilder() return } // Set the AES wrap key. jwe2.SetWrappingKey(0,aesWrappingKey,"base64url") // Decrypt. sbOriginalText.Clear() success = jwe2.DecryptSb(0,"utf-8",sbOriginalText) if success != true { fmt.Println(jwe2.LastErrorText()) sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() sbJweUncompressed.DisposeStringBuilder() jwe2.DisposeJwe() sbOriginalText.DisposeStringBuilder() return } fmt.Println("original text from uncompressed JWE: ") fmt.Println(*sbOriginalText.GetAsString()) // ------------------------------------------------ // 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. // sbPlainText.DisposeStringBuilder() jwe.DisposeJwe() jweProtHdr.DisposeJsonObject() sbJweCompressed.DisposeStringBuilder() sbJweUncompressed.DisposeStringBuilder() jwe2.DisposeJwe() sbOriginalText.DisposeStringBuilder() |
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