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crypto.ascon: support up to 16 rounds, and update links (#21953)

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Initial public draft NIST SP 800-232 specifies Ascon constants
up to 16 rounds for future extensions. So, add these new constants.
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Frank Denis 2024-11-10 21:43:09 +01:00 committed by GitHub
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commit 05a3ac43e9
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1 changed files with 5 additions and 4 deletions
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9
lib/std/crypto/ascon.zig
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@ -1,6 +1,6 @@
//! Ascon is a 320-bit permutation, selected as new standard for lightweight cryptography //! Ascon is a 320-bit permutation, selected as new standard for lightweight cryptography
//! in the NIST Lightweight Cryptography competition (2019–2023). //! in the NIST Lightweight Cryptography competition (2019–2023).
//! https://csrc.nist.gov/News/2023/lightweight-cryptography-nist-selects-ascon //! https://csrc.nist.gov/pubs/sp/800/232/ipd
//! //!
//! The permutation is compact, and optimized for timing and side channel resistance, //! The permutation is compact, and optimized for timing and side channel resistance,
//! making it a good choice for embedded applications. //! making it a good choice for embedded applications.
@ -19,8 +19,9 @@ const native_endian = builtin.cpu.arch.endian();
/// ///
/// The state is represented as 5 64-bit words. /// The state is represented as 5 64-bit words.
/// ///
/// The NIST submission (v1.2) serializes these words as big-endian, /// The original NIST submission (v1.2) serializes these words as big-endian,
/// but software implementations are free to use native endianness. /// but NIST SP 800-232 switched to a little-endian representation.
/// Software implementations are free to use native endianness with no security degradation.
pub fn State(comptime endian: std.builtin.Endian) type { pub fn State(comptime endian: std.builtin.Endian) type {
return struct { return struct {
const Self = @This(); const Self = @This();
@ -157,7 +158,7 @@ pub fn State(comptime endian: std.builtin.Endian) type {
/// Apply a reduced-round permutation to the state. /// Apply a reduced-round permutation to the state.
pub inline fn permuteR(state: *Self, comptime rounds: u4) void { pub inline fn permuteR(state: *Self, comptime rounds: u4) void {
const rks = [12]u64{ 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87, 0x78, 0x69, 0x5a, 0x4b }; const rks = [16]u64{ 0x3c, 0x2d, 0x1e, 0x0f, 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87, 0x78, 0x69, 0x5a, 0x4b };
inline for (rks[rks.len - rounds ..]) |rk| { inline for (rks[rks.len - rounds ..]) |rk| {
state.round(rk); state.round(rk);
} }