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ctutils: add integer primitives module - #1570
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Adds a set of functions extracted from RustCrypto/crypto-bigint#1360 which provide a set of reusable integer primitive operations where we were previously generating non-constant-time code on certain platforms. Validates the generated assembly is constant time using `cargo checkct`/BINSEC.
This was referenced Oct 23, 2026
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Followup to #1570 which added `overflowing_add_*` primitives which return `Choice`. This adds the analogous subtraction functionality.
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Fix secret-dependent branches in zero counting, bit-length rounding, division, and Montgomery multiplication. Reuse the hardened primitives and `Choice` operations from RustCrypto/utils#1570 and RustCrypto/utils#1571. Add `cargo checkct` regressions across Thumb-1, Thumb-2, RISCV32, and x86-64, including unoptimized coverage for `nlimbs`.
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Adds a set of functions extracted from RustCrypto/crypto-bigint#1360 which provide a set of reusable integer primitive operations where we were previously generating non-constant-time code on certain platforms.
Validates the generated assembly is constant time using
cargo checkct/BINSEC.