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How to implement AES-CCM in Dart

I'm trying to migrate some JavaScript encryption code to a Dart equivalent but I cannot get the same result.

The JavaScript code is using Stanford JavaScript Crypto Library and the Dart version is using AesGcm from Dart Cryptography 2.5.0 (https://pub.dev/packages/cryptography).

The code in JS is

result = sjcl.codec.hex.fromBits(
                sjcl.mode.ccm.encrypt(
                new sjcl.cipher.aes(sjcl.codec.hex.toBits("6dbe8f8c87d58e61c2ec29321f42e9ff")), // prf
                sjcl.codec.hex.toBits("00626c742e332e3132397649356b744455415443"), // plaintext
                sjcl.codec.hex.toBits("101112131415161718191A1B"), // iv
                sjcl.codec.hex.toBits("6465764944"),  // adata
                32));

The Dart I try to implement is

final encrypted = await AesGcm.with256bits().encrypt(
    secretKey: SecretKey(utf8.encode("6dbe8f8c87d58e61c2ec29321f42e9ff")), // prf ?
    utf8.encode("00626c742e332e3132397649356b744455415443"), // plaintext (device_new_id?)
    nonce: utf8.encode("101112131415161718191A1B"), // iv
    aad: utf8.encode("6465764944"), // adata
  );

  // Convert encrypted bytes to hex
  final result= bytesToHex( Uint8List.fromList(encrypted.cipherText));

The result differs but I cannot see why ?

Hope someone can point me in the right direction ?

Best regards Martin

Via Active questions tagged javascript - Stack Overflow https://ift.tt/pvfoRPB

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