desktop: build seshat with ARMv8 hardware AES#33954
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Seshat encrypts its index with AES-256 from the RustCrypto `aes` crate. On aarch64 that crate only uses the ARMv8 hardware AES backend when built with `--cfg aes_armv8`; without it it falls back to a constant-time software implementation that uses ~10-20x more CPU. Append the flag to RUSTFLAGS for arm64 builds (x86_64 auto-detects AES-NI at runtime). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JP4yoxKeGLRDLkCPTu3DFq
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Drafting due to Seshat PR not being merged |
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Seshat encrypts its index with AES-256 from the RustCrypto
aescrate. On aarch64 that crate only uses the ARMv8 hardware AES backend when built with--cfg aes_armv8; without it it falls back to a constant-time software implementation that uses ~10-20x more CPU. Append the flag to RUSTFLAGS for arm64 builds (x86_64 auto-detects AES-NI at runtime).Requires matrix-org/seshat#185
Fixes bits of #32119