5bb280eb25
- Integrated `zupt_mac_verify_ct` in `zupt_decrypt_buffer()` to replace C XOR loop for HMAC-SHA256 - Integrated `zupt_ct_select_32` in `zupt_mlkem768_decaps()` to replace C `cmov()` for FO transformation - Added `include/zupt_jasmin.h` with extern declarations and ABI docs - Added `#ifdef ZUPT_USE_JASMIN` guards with clean C fallbacks in `zupt_crypto.c` and `zupt_mlkem.c` - Makefile now auto-detects `jasmin/*.s`, assembles and links with `-DZUPT_USE_JASMIN` Closes #3
39 lines
807 B
ArmAsm
39 lines
807 B
ArmAsm
.intel_syntax noprefix
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.text
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.p2align 5
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.global zupt_ct_select_32
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.type zupt_ct_select_32, %function
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zupt_ct_select_32:
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mov rax, 0
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sub rax, rcx
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mov rcx, qword ptr[rsi]
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mov r8, qword ptr[rdx]
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mov r9, rcx
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xor r9, r8
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and r9, rax
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xor rcx, r9
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mov qword ptr[rdi], rcx
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mov rcx, qword ptr[rsi + 8]
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mov r8, qword ptr[rdx + 8]
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mov r9, rcx
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xor r9, r8
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and r9, rax
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xor rcx, r9
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mov qword ptr[rdi + 8], rcx
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mov rcx, qword ptr[rsi + 16]
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mov r8, qword ptr[rdx + 16]
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mov r9, rcx
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xor r9, r8
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and r9, rax
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xor rcx, r9
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mov qword ptr[rdi + 16], rcx
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mov rcx, qword ptr[rsi + 24]
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mov r8, qword ptr[rdx + 24]
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mov r9, rcx
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xor r9, r8
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and r9, rax
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xor rcx, r9
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mov qword ptr[rdi + 24], rcx
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ret
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.ident "Jasmin Compiler 2026.03.0"
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.section ".note.GNU-stack", "", %progbits
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