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std.crypto.sha3: Minor TurboSHAKE/Keccak fixes (#16408)

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e4m2 2023-07-14 16:02:01 +02:00 • committed by GitHub
parent 094cd92615
commit 3022c525ec
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2 changed files with 13 additions and 7 deletions
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2
lib/std/crypto/keccak_p.zig
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@ -56,7 +56,7 @@ pub fn KeccakF(comptime f: u11) type {
/// Byte-swap the entire state if the architecture doesn't match the required endianness.
pub fn endianSwap(self: *Self) void {
for (&self.st) |*w| {
w.* = mem.littleTooNative(T, w.*);
w.* = mem.littleToNative(T, w.*);
}
}

18
lib/std/crypto/sha3.zig
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@ -21,14 +21,15 @@ pub const Shake256 = Shake(256);
/// TurboSHAKE128 is a XOF (a secure hash function with a variable output length), with a 128 bit security level.
/// It is based on the same permutation as SHA3 and SHAKE128, but which much higher performance.
/// The delimiter is 0x1f by default, but can be changed for context-separation.
pub fn TurboShake128(comptime delim: ?u8) type {
/// For a protocol that uses both KangarooTwelve and TurboSHAKE128, it is recommended to avoid using 0x06, 0x07 or 0x0b for the delimiter.
pub fn TurboShake128(comptime delim: ?u7) type {
return TurboShake(128, delim);
}
/// TurboSHAKE256 is a XOF (a secure hash function with a variable output length), with a 256 bit security level.
/// It is based on the same permutation as SHA3 and SHAKE256, but which much higher performance.
/// The delimiter is 0x01 by default, but can be changed for context-separation.
pub fn TurboShake256(comptime delim: ?u8) type {
/// The delimiter is 0x1f by default, but can be changed for context-separation.
pub fn TurboShake256(comptime delim: ?u7) type {
return TurboShake(256, delim);
}
@ -94,9 +95,14 @@ pub fn Shake(comptime security_level: u11) type {
}
/// The TurboSHAKE extendable output hash function.
/// https://datatracker.ietf.org/doc/draft-irtf-cfrg-kangarootwelve/
pub fn TurboShake(comptime security_level: u11, comptime delim: ?u8) type {
return ShakeLike(security_level, delim orelse 0x1f, 12);
/// It is based on the same permutation as SHA3 and SHAKE, but which much higher performance.
/// The delimiter is 0x1f by default, but can be changed for context-separation.
/// https://eprint.iacr.org/2023/342
pub fn TurboShake(comptime security_level: u11, comptime delim: ?u7) type {
comptime assert(security_level <= 256);
const d = delim orelse 0x1f;
comptime assert(d >= 0x01); // delimiter must be >= 1
return ShakeLike(security_level, d, 12);
}
fn ShakeLike(comptime security_level: u11, comptime delim: u8, comptime rounds: u5) type {