Improve AesGcmSiv `Aead` performance by optimizing classpath check

[ks-yim]

Motivation:

Aead implementation for AesGcmSiv checks if GCMParameterSpec class exists in classpath by invoking Class#forName method whenever data gets encrypted or decrypted.

A benchmark on AesGcmSiv claims that Class#forName accounts for 4-5% of the CPU cycles consumed to encrypt and decrypt data and 12% or more throughput gain can be obtained by optimizing away the Class#forName invocation.

Modification:

Cache the result of the classpath check in AesGcmSiv

BM Results:

• BM Code

• Run on:

  • MacBook Pro (16-inch, 2021) Apple M1 Pro 32GB, MacOS Monterey version 12.6.2
  • Used Conscrypt custom build based on 3051cda to utilize AES-NI on Apple Silicon.

• Before

  # JMH version: 1.35
  # VM version: JDK 11.0.17, OpenJDK 64-Bit Server VM, 11.0.17+8
  # VM invoker: /Users/ks-yim/.sdkman/candidates/java/11.0.17-tem/bin/java
  # VM options: -Dfile.encoding=UTF-8 -Djava.io.tmpdir=/Users/ks-yim/IdeaProjects/tink-bm/build/tmp/jmh - 
  Duser.country=KR -Duser.language=en -Duser.variant
  # Blackhole mode: full + dont-inline hint (auto-detected, use -Djmh.blackhole.autoDetect=false to disable)
  # Warmup: 1 iterations, 10 s each
  # Measurement: 1 iterations, 10 s each
  # Timeout: 10 min per iteration
  # Threads: 8 threads, will synchronize iterations
  # Benchmark mode: Throughput, ops/time
  # Benchmark: com.example.tink.bm.AesGcmSivBenchmark.conscrypt_encrypt
  
  Benchmark                                             Mode  Cnt       Score   Error  Units
  AesGcmSivBenchmark.bc_decrypt                        thrpt       140397.856          ops/s
  AesGcmSivBenchmark.bc_encrypt                        thrpt       161178.303          ops/s
  AesGcmSivBenchmark.conscrypt_decrypt                 thrpt       487751.715          ops/s
  AesGcmSivBenchmark.conscrypt_encrypt                 thrpt       462492.430          ops/s

• After

  Benchmark                                             Mode  Cnt       Score   Error  Units
  AesGcmSivBenchmark.bc_decrypt                        thrpt       168118.773          ops/s
  AesGcmSivBenchmark.bc_encrypt                        thrpt       172307.366          ops/s
  AesGcmSivBenchmark.conscrypt_decrypt                 thrpt       546720.978          ops/s
  AesGcmSivBenchmark.conscrypt_encrypt                 thrpt       551282.859          ops/s

CPU Profiling Result:

• Before

  • Encryption

  • Decryption

• After

  • Encryption

  • Decryption

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[morambro]

Hi @ks-yim, could you please open this PR in https://github.com/tink-crypto/tink-java?

We are splitting and moving our repos to https://github.com/tink-crypto.

[ks-yim]

@morambro Ah, haven't noticed the change. I will move the PR to the new repo, thanks!

[morambro]

Thanks!

[ks-yim]

Closing in favor of https://github.com/tink-crypto/tink-java/pull/5