std.crypto.hash: add a non-clobbering method to serialize the current hash value #13400
Closed as not planned
Description
Zig Version
0.11.0-dev.6+2943df016
Steps to Reproduce and Observed Behavior
const std = @import("std");
test {
const Sha256 = std.crypto.hash.sha2.Sha256;
const length = Sha256.digest_length;
var b1: [length]u8 = undefined;
var h1 = Sha256.init(.{});
h1.update("abab");
h1.update("cdcd");
h1.final(&b1);
h1.update("efef");
h1.final(&b1);
var o1: [length * 2]u8 = undefined;
_ = try std.fmt.bufPrint(&o1, "{}", .{std.fmt.fmtSliceHexLower(&b1)});
var b2: [length]u8 = undefined;
var h2 = Sha256.init(.{});
h2.update("abab");
h2.update("cdcd");
h2.update("efef");
h2.final(&b2);
var o2: [length * 2]u8 = undefined;
_ = try std.fmt.bufPrint(&o2, "{}", .{std.fmt.fmtSliceHexLower(&b2)});
try std.testing.expectEqualStrings(&o2, &o1);
}Test [1/1] test_0...
====== expected this output: =========
7a8abe2debd5bc4afc9a940226200962136858ad3bd4f2777ad2974f133f3237␃
======== instead found this: =========
6934c9d035b7387a84482e1f5c0c4f7ead3b2784ba3923630fc0f5aecee733a3␃
======================================
First difference occurs on line 1:
expected:
7a8abe2debd5bc4afc9a940226200962136858ad3bd4f2777ad2974f133f3237
^ ('\x37')
found:
6934c9d035b7387a84482e1f5c0c4f7ead3b2784ba3923630fc0f5aecee733a3
^ ('\x36')
Test [1/1] test_0... FAIL (TestExpectedEqual)
Expected Behavior
.final() to not dirty the state, or an alternate function (eg .serialize() that does not clobber)