Method encrypt

test/common/tls.js:115–131

(plain)

  }

  encrypt(plain) {
    const type = plain.slice(0, 1);
    const version = plain.slice(1, 3);
    const nonce = crypto.randomBytes(8);
    const iv = Buffer.concat([this.client_writeIV.slice(0, 4), nonce]);
    const bob = crypto.createCipheriv('aes-128-gcm', this.client_writeKey, iv);
    const write_seq = Buffer.alloc(8);
    write_seq.writeUInt32BE(this.write_seq++, 4);
    const aad = Buffer.concat([write_seq, plain.slice(0, 5)]);
    bob.setAAD(aad);
    const encrypted1 = bob.update(plain.slice(5));
    const encrypted = Buffer.concat([encrypted1, bob.final()]);
    const tag = bob.getAuthTag();
    const length = Buffer.alloc(2);
    length.writeUInt16BE(nonce.length + encrypted.length + tag.length, 0);
    return Buffer.concat([type, version, length, nonce, encrypted, tag]);
  }
}

function addRecordHeader(type, frame) {