// Modified by ProtonTech AG

// Adapted from https://github.com/artjomb/cryptojs-extension/blob/8c61d159/test/eax.js

const openpgp = typeof window !== 'undefined' && window.openpgp ? window.openpgp : require('../..');

const chai = require('chai');
chai.use(require('chai-as-promised'));

const expect = chai.expect;

function testAESEAX() {
  it('Passes all test vectors', async function() {
    const vectors = [
      // From http://www.cs.ucdavis.edu/~rogaway/papers/eax.pdf ...
      {
        msg: "",
        key: "233952DEE4D5ED5F9B9C6D6FF80FF478",
        nonce: "62EC67F9C3A4A407FCB2A8C49031A8B3",
        header: "6BFB914FD07EAE6B",
        ct: "E037830E8389F27B025A2D6527E79D01"
      },
      {
        msg: "F7FB",
        key: "91945D3F4DCBEE0BF45EF52255F095A4",
        nonce: "BECAF043B0A23D843194BA972C66DEBD",
        header: "FA3BFD4806EB53FA",
        ct: "19DD5C4C9331049D0BDAB0277408F67967E5"
      },
      {
        msg: "1A47CB4933",
        key: "01F74AD64077F2E704C0F60ADA3DD523",
        nonce: "70C3DB4F0D26368400A10ED05D2BFF5E",
        header: "234A3463C1264AC6",
        ct: "D851D5BAE03A59F238A23E39199DC9266626C40F80"
      },
      {
        msg: "481C9E39B1",
        key: "D07CF6CBB7F313BDDE66B727AFD3C5E8",
        nonce: "8408DFFF3C1A2B1292DC199E46B7D617",
        header: "33CCE2EABFF5A79D",
        ct: "632A9D131AD4C168A4225D8E1FF755939974A7BEDE"
      },
      {
        msg: "40D0C07DA5E4",
        key: "35B6D0580005BBC12B0587124557D2C2",
        nonce: "FDB6B06676EEDC5C61D74276E1F8E816",
        header: "AEB96EAEBE2970E9",
        ct: "071DFE16C675CB0677E536F73AFE6A14B74EE49844DD"
      },
      {
        msg: "4DE3B35C3FC039245BD1FB7D",
        key: "BD8E6E11475E60B268784C38C62FEB22",
        nonce: "6EAC5C93072D8E8513F750935E46DA1B",
        header: "D4482D1CA78DCE0F",
        ct: "835BB4F15D743E350E728414ABB8644FD6CCB86947C5E10590210A4F"
      },
      {
        msg: "8B0A79306C9CE7ED99DAE4F87F8DD61636",
        key: "7C77D6E813BED5AC98BAA417477A2E7D",
        nonce: "1A8C98DCD73D38393B2BF1569DEEFC19",
        header: "65D2017990D62528",
        ct: "02083E3979DA014812F59F11D52630DA30137327D10649B0AA6E1C181DB617D7F2"
      },
      {
        msg: "1BDA122BCE8A8DBAF1877D962B8592DD2D56",
        key: "5FFF20CAFAB119CA2FC73549E20F5B0D",
        nonce: "DDE59B97D722156D4D9AFF2BC7559826",
        header: "54B9F04E6A09189A",
        ct: "2EC47B2C4954A489AFC7BA4897EDCDAE8CC33B60450599BD02C96382902AEF7F832A"
      },
      {
        msg: "6CF36720872B8513F6EAB1A8A44438D5EF11",
        key: "A4A4782BCFFD3EC5E7EF6D8C34A56123",
        nonce: "B781FCF2F75FA5A8DE97A9CA48E522EC",
        header: "899A175897561D7E",
        ct: "0DE18FD0FDD91E7AF19F1D8EE8733938B1E8E7F6D2231618102FDB7FE55FF1991700"
      },
      {
        msg: "CA40D7446E545FFAED3BD12A740A659FFBBB3CEAB7",
        key: "8395FCF1E95BEBD697BD010BC766AAC3",
        nonce: "22E7ADD93CFC6393C57EC0B3C17D6B44",
        header: "126735FCC320D25A",
        ct: "CB8920F87A6C75CFF39627B56E3ED197C552D295A7CFC46AFC253B4652B1AF3795B124AB6E"
      }
    ];

    const cipher = 'aes128';

    await Promise.all(vectors.map(async vec => {
      const keyBytes = openpgp.util.hexToUint8Array(vec.key);
      const msgBytes = openpgp.util.hexToUint8Array(vec.msg);
      const nonceBytes = openpgp.util.hexToUint8Array(vec.nonce);
      const headerBytes = openpgp.util.hexToUint8Array(vec.header);
      const ctBytes = openpgp.util.hexToUint8Array(vec.ct);

      const eax = await openpgp.crypto.eax(cipher, keyBytes);

      // encryption test
      let ct = await eax.encrypt(msgBytes, nonceBytes, headerBytes);
      expect(openpgp.util.uint8ArrayToHex(ct)).to.equal(vec.ct.toLowerCase());

      // decryption test with verification
      let pt = await eax.decrypt(ctBytes, nonceBytes, headerBytes);
      expect(openpgp.util.uint8ArrayToHex(pt)).to.equal(vec.msg.toLowerCase());

      // tampering detection test
      ct = await eax.encrypt(msgBytes, nonceBytes, headerBytes);
      ct[2] ^= 8;
      pt = eax.decrypt(ct, nonceBytes, headerBytes);
      await expect(pt).to.eventually.be.rejectedWith('Authentication tag mismatch');

      // testing without additional data
      ct = await eax.encrypt(msgBytes, nonceBytes, new Uint8Array());
      pt = await eax.decrypt(ct, nonceBytes, new Uint8Array());
      expect(openpgp.util.uint8ArrayToHex(pt)).to.equal(vec.msg.toLowerCase());

      // testing with multiple additional data
      ct = await eax.encrypt(msgBytes, nonceBytes, openpgp.util.concatUint8Array([headerBytes, headerBytes, headerBytes]));
      pt = await eax.decrypt(ct, nonceBytes, openpgp.util.concatUint8Array([headerBytes, headerBytes, headerBytes]));
      expect(openpgp.util.uint8ArrayToHex(pt)).to.equal(vec.msg.toLowerCase());
    }));
  });
}

module.exports = () => {
  describe('Symmetric AES-EAX (native)', function() {
    let useNativeVal;
    beforeEach(function() {
      useNativeVal = openpgp.config.useNative;
      openpgp.config.useNative = true;
    });
    afterEach(function() {
      openpgp.config.useNative = useNativeVal;
    });

    testAESEAX();
  });

  describe('Symmetric AES-EAX (asm.js fallback)', function() {
    let useNativeVal;
    beforeEach(function() {
      useNativeVal = openpgp.config.useNative;
      openpgp.config.useNative = false;
    });
    afterEach(function() {
      openpgp.config.useNative = useNativeVal;
    });

    testAESEAX();
  });
};