mozilla / fxa-pairing-channel - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 200 units with 1,552 lines of code in units (86.3% of code).

0 very complex units (0 lines of code)
0 complex units (0 lines of code)
0 medium complex units (0 lines of code)
11 simple units (327 lines of code)
189 very simple units (1,225 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
static _read() in src/messages.js	37	10	1
static read() in src/messages.js	30	8	1
async send() in src/recordlayer.js	22	8	2
async recv() in src/recordlayer.js	24	8	1
async _readEncryptedRecord() in src/recordlayer.js	26	7	3
async recvHandshakeMessage() in src/states.js	26	7	1
async recv() in src/tlsconnection.js	33	7	1
_setupListeners() in src/index.js	51	6	0
static _read() in src/messages.js	21	6	1
async flush() in src/recordlayer.js	35	6	0
async recvHandshakeMessage() in src/states.js	22	6	1
slice() in src/utils.js	15	5	2
static read() in src/extensions.js	25	5	2
static _read() in src/extensions.js	29	5	2
async close() in src/index.js	17	4	0
export async function hkdfExpand() in src/crypto.js	20	4	3
export function bytesAreEqual() in src/utils.js	13	4	2
_readVector() in src/utils.js	16	4	2
static fromBytes() in src/alerts.js	14	4	1
async recvChangeCipherSpec() in src/states.js	9	4	1
seek() in src/utils.js	9	3	1
_rangeErrorToAlert() in src/utils.js	10	3	1
_write() in src/extensions.js	22	3	2
static _read() in src/extensions.js	17	3	2
_write() in src/extensions.js	16	3	2
async addPSK() in src/keyschedule.js	12	3	1
async addECDHE() in src/keyschedule.js	14	3	1
function alertTypeToName() in src/alerts.js	8	3	1
async handleErrorAndRethrow() in src/states.js	11	3	1
async recvHandshakeMessage() in src/states.js	11	3	1
async _setRecvKey() in src/tlsconnection.js	6	3	1
static _makePairingChannel() in src/index.js	32	2	3
_shutdown() in src/index.js	7	2	0
get closed() in src/index.js	3	2	0
export async function decrypt() in src/crypto.js	13	2	4
export async function verifyHmac() in src/crypto.js	9	2	3
export function assert() in src/utils.js	5	2	2
export function bytesToHex() in src/utils.js	9	2	1
export function hexToBytes() in src/utils.js	14	2	1
export function base64urlToBytes() in src/utils.js	8	2	1
_maybeGrow() in src/utils.js	12	2	1
static fromBytes() in src/messages.js	8	2	1
static _readExtensions() in src/messages.js	12	2	2
static _read() in src/messages.js	11	2	1
nonce() in src/recordlayer.js	10	2	0
async _readPlaintextRecord() in src/recordlayer.js	6	2	3
static _read() in src/extensions.js	13	2	2
_write() in src/extensions.js	13	2	2
async finalize() in src/keyschedule.js	12	2	0
async deriveSecret() in src/keyschedule.js	4	2	2