Identity/AttachedServices/Key Stretching Performance Tests

Test Results (in seconds per operation)

Browser / Test	Firefox 23 Desktop	Google Chrome 28	Firefox Android Beta 24	Firefox OS	Android WebView	Android + OpenSSL
[1] 20k PBKDF2-SHA256	186ms (5.39 ops/sec ±4.20%, 30 runs sampled)	123ms (8.12 ops/sec ±1.15%, 43 runs sampled)	2.13s (0.47 ops/sec ±7.73%, 7 runs sampled)	4.17ms (0.24 ops/sec ±7.06%, 6 runs sampled)	1.52s (0.66 ops/sec ±4.35%, 8 runs sampled)	351ms (2.85 ops/sec, **1 run sampled**)
[2] 20k*PBKDF + remote(scrypt(64k,8,1)) + 20k*PBKDF	1.52ms (0.66 ops/sec ±10.70%, 8 runs sampled)	1.27ms (0.79 ops/sec ±1.98%, 8 runs sampled)	6.25s (0.16 ops/sec ±9.02%, 5 runs sampled)	10s (0.10 ops/sec ±3.37%, 5 runs sampled)	5.56s (0.18 ops/sec ±21.96%, 6 runs sampled)	--
[3] 20kPBKDF + local(scrypt(64k,8,1)) + 20kPBKDF	--	--	--	--	--	7.3s (0.1369 ops/sec, 10 runs sampled, extremes discarded -- 7362-7505msec)

Tests

• [1] 20k PBKDF2-SHA256, pdbkdf2.derive(...) - Client pdbkdf2 derivation #stretch-KDF
• [2] 20k*PBKDF+scrypt(64k,8,1)+20k*PBKDF keyStretch.derive(email, password) - Full Key Stretch with a remote scrypt helper at "http://scrypt.dev.lcip.org/" (EC2 m1.small, est scrypt(64k,8,1) time = 2.2s). #stretch-KDF + #main-KDF
• [3] 20kPBKDF + local(scrypt(64k,8,1)) + 20kPBKDF

Note that the m1.small instance runs scrypt in 2.2s, whereas the more cost-effective (given serious load) c1.medium or c1.xlarge instances will run it in 1.0s .

Test Framework

These performance tests use Benchmark.js

• "ops/sec" stands for operations per second. That is how many times a test is projected to execute in a second.
• A test is repeatedly executed until it reaches the minimum time needed to get a percentage uncertainty for the measurement of less than or equal to 1%. The number of iterations will vary depending on the resolution of the environment’s timer and how many times a test can execute in the minimum run time. We collect completed test runs for 5 seconds (configurable), or at least 5 runs (also configurable), and then perform statistical analysis on the sample. So, a test may be repeated 100,000 times in 50 ms (the minimum run time for most environments), and then repeated 100 times more (5 seconds). A larger sample size (in this example, 100), leads to a smaller margin of error.

Test Suite Page: http://v14d.com/picl/benchmark.html