aes128_ctr

GitHub

hardruntimeC

results

Measured by wall-clock runtime in seconds — lower is better.

3.0s0.10s

sota

Claude-Opus-4.6

reward 0.750

Usage

Run the reference answer to verify your environment is set up correctly

$ harbor run -p tasks/aes128_ctr

Test model

$ harbor run -p tasks/aes128_ctr \
  -a claude-code -m claude-opus-4-6

Description

Optimize AES-128 in Counter (CTR) mode to encrypt 256 MiB of data as fast as possible in C. The output must match NIST SP 800-38A test vectors exactly. SIMD intrinsics including AES-NI (via immintrin.h and wmmintrin.h) are available for hardware-accelerated encryption.

Files

path

permission

/app/solve.c✎ Edit

/app/main.cRead-only

/app/solve.hRead-only

/app/MakefileRead-only

Rules

01Edit /app/solve.c only.
02C11 only. No external libraries beyond C standard library, <immintrin.h>, and <wmmintrin.h>.
03GCC extensions and intrinsics are allowed. Single-threaded only.