cipher/gost28147: optimization: use precomputed S-box tables
* cipher/gost.h (GOST28147_context): Remove unneeded subst and subst_set members. * cipher/gost28147.c (max): Remove unneeded macro. (test_sbox): Replace with new precomputed tables. (gost_set_subst): Remove function. (gost_val): Use new S-box tables. (gost_encrypt_block, gost_decrypt_block): Tweak to use new ctx and S-box tables.
Use generated 8->8 S-boxes with precomputed bitwise shifts and
bitwise rotations. So in the round function gost_val() we no need
to do this operations.
Before this patch:
GOST28147 | nanosecs/byte mebibytes/sec cycles/byte
ECB enc | 24.00 ns/B 39.74 MiB/s - c/B ECB dec | 26.41 ns/B 36.11 MiB/s - c/B CBC enc | 24.57 ns/B 38.81 MiB/s - c/B CBC dec | 26.58 ns/B 35.88 MiB/s - c/B CFB enc | 24.79 ns/B 38.46 MiB/s - c/B CFB dec | 24.72 ns/B 38.57 MiB/s - c/B OFB enc | 24.38 ns/B 39.12 MiB/s - c/B OFB dec | 24.35 ns/B 39.16 MiB/s - c/B CTR enc | 24.83 ns/B 38.41 MiB/s - c/B CTR dec | 25.27 ns/B 37.73 MiB/s - c/B
After:
GOST28147 | nanosecs/byte mebibytes/sec cycles/byte
ECB enc | 16.29 ns/B 58.55 MiB/s - c/B ECB dec | 16.30 ns/B 58.50 MiB/s - c/B CBC enc | 16.94 ns/B 56.29 MiB/s - c/B CBC dec | 16.81 ns/B 56.72 MiB/s - c/B CFB enc | 17.13 ns/B 55.66 MiB/s - c/B CFB dec | 16.84 ns/B 56.63 MiB/s - c/B OFB enc | 16.69 ns/B 57.13 MiB/s - c/B OFB dec | 16.71 ns/B 57.08 MiB/s - c/B CTR enc | 17.01 ns/B 56.06 MiB/s - c/B CTR dec | 17.05 ns/B 55.93 MiB/s - c/B
- Signed-off-by: Sergey V <sftp.mtuci@gmail.com>