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a7122b7323
std.crypto: add constant-time codecs Add constant-time hex/base64 codecs designed to process cryptographic secrets, adapted from libsodium's implementations. Introduce a `crypto.codecs` namespace for crypto-related encoders and decoders. Move ASN.1 codecs to this namespace. This will also naturally accommodate the proposed PEM codecs.
56 lines
1.8 KiB
Zig
56 lines
1.8 KiB
Zig
//! Distinguised Encoding Rules as defined in X.690 and X.691.
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//!
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//! Subset of Basic Encoding Rules (BER) which eliminates flexibility in
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//! an effort to acheive normality. Used in PKI.
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const std = @import("std");
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const asn1 = @import("../asn1.zig");
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pub const Decoder = @import("der/Decoder.zig");
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pub const Encoder = @import("der/Encoder.zig");
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pub fn decode(comptime T: type, encoded: []const u8) !T {
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var decoder = Decoder{ .bytes = encoded };
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const res = try decoder.any(T);
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std.debug.assert(decoder.index == encoded.len);
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return res;
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}
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/// Caller owns returned memory.
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pub fn encode(allocator: std.mem.Allocator, value: anytype) ![]u8 {
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var encoder = Encoder.init(allocator);
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defer encoder.deinit();
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try encoder.any(value);
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return try encoder.buffer.toOwnedSlice();
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}
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test encode {
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// https://lapo.it/asn1js/#MAgGAyoDBAIBBA
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const Value = struct { a: asn1.Oid, b: i32 };
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const test_case = .{
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.value = Value{ .a = asn1.Oid.fromDotComptime("1.2.3.4"), .b = 4 },
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.encoded = &[_]u8{ 0x30, 0x08, 0x06, 0x03, 0x2A, 0x03, 0x04, 0x02, 0x01, 0x04 },
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};
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const allocator = std.testing.allocator;
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const actual = try encode(allocator, test_case.value);
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defer allocator.free(actual);
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try std.testing.expectEqualSlices(u8, test_case.encoded, actual);
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}
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test decode {
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// https://lapo.it/asn1js/#MAgGAyoDBAIBBA
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const Value = struct { a: asn1.Oid, b: i32 };
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const test_case = .{
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.value = Value{ .a = asn1.Oid.fromDotComptime("1.2.3.4"), .b = 4 },
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.encoded = &[_]u8{ 0x30, 0x08, 0x06, 0x03, 0x2A, 0x03, 0x04, 0x02, 0x01, 0x04 },
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};
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const decoded = try decode(Value, test_case.encoded);
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try std.testing.expectEqualDeep(test_case.value, decoded);
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}
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test {
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_ = Decoder;
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_ = Encoder;
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}
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