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std.crypto.siphash: add finalResult() and peek()

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Useful for avoiding mutable state when using this API.
This commit is contained in:
Andrew Kelley 2023-01-07 18:06:26 -07:00
parent 87b223428a
commit e579c88f4c
1 changed files with 22 additions and 0 deletions
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22
lib/std/crypto/siphash.zig
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@ -87,6 +87,11 @@ fn SipHashStateless(comptime T: type, comptime c_rounds: usize, comptime d_round
self.msg_len +%= @truncate(u8, b.len);
}
pub fn peek(self: Self) [digest_length]u8 {
var copy = self;
return copy.finalResult();
}
pub fn final(self: *Self, b: []const u8) T {
std.debug.assert(b.len < 8);
@ -124,6 +129,12 @@ fn SipHashStateless(comptime T: type, comptime c_rounds: usize, comptime d_round
return (@as(u128, b2) << 64) | b1;
}
pub fn finalResult(self: *Self) [digest_length]u8 {
var result: [digest_length]u8 = undefined;
self.final(&result);
return result;
}
fn round(self: *Self, b: [8]u8) void {
const m = mem.readIntLittle(u64, b[0..8]);
self.v3 ^= m;
@ -205,12 +216,23 @@ fn SipHash(comptime T: type, comptime c_rounds: usize, comptime d_rounds: usize)
self.buf_len += @intCast(u8, b[off + aligned_len ..].len);
}
pub fn peek(self: Self) [mac_length]u8 {
var copy = self;
return copy.finalResult();
}
/// Return an authentication tag for the current state
/// Assumes `out` is less than or equal to `mac_length`.
pub fn final(self: *Self, out: *[mac_length]u8) void {
mem.writeIntLittle(T, out, self.state.final(self.buf[0..self.buf_len]));
}
pub fn finalResult(self: *Self) [mac_length]u8 {
var result: [mac_length]u8 = undefined;
self.final(&result);
return result;
}
/// Return an authentication tag for a message and a key
pub fn create(out: *[mac_length]u8, msg: []const u8, key: *const [key_length]u8) void {
var ctx = Self.init(key);