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std/crypto: make Hkdf functions public

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Frank Denis 2020-11-01 16:21:58 +01:00 committed by Veikka Tuominen
parent 9ca9819488
commit c387f1340f
1 changed files with 2 additions and 2 deletions
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4
lib/std/crypto/hkdf.zig
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@ -20,14 +20,14 @@ pub const HkdfSha512 = Hkdf(hmac.sha2.HmacSha512);
pub fn Hkdf(comptime Hmac: type) type { pub fn Hkdf(comptime Hmac: type) type {
return struct { return struct {
/// Return a master key from a salt and initial keying material. /// Return a master key from a salt and initial keying material.
fn extract(salt: []const u8, ikm: []const u8) [Hmac.mac_length]u8 { pub fn extract(salt: []const u8, ikm: []const u8) [Hmac.mac_length]u8 {
var prk: [Hmac.mac_length]u8 = undefined; var prk: [Hmac.mac_length]u8 = undefined;
Hmac.create(&prk, ikm, salt); Hmac.create(&prk, ikm, salt);
return prk; return prk;
} }
/// Derive a subkey from a master key `prk` and a subkey description `ctx`. /// Derive a subkey from a master key `prk` and a subkey description `ctx`.
fn expand(out: []u8, ctx: []const u8, prk: [Hmac.mac_length]u8) void { pub fn expand(out: []u8, ctx: []const u8, prk: [Hmac.mac_length]u8) void {
assert(out.len < Hmac.mac_length * 255); // output size is too large for the Hkdf construction assert(out.len < Hmac.mac_length * 255); // output size is too large for the Hkdf construction
var i: usize = 0; var i: usize = 0;
var counter = [1]u8{1}; var counter = [1]u8{1};