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Add Poly1305 tag verification

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Miguel Oliveira 2022-03-05 12:24:33 -03:00
parent 474d62d082
commit 238058e46f
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GPG key ID: 2C2BE789E1377025
1 changed files with 15 additions and 0 deletions
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15
poly1305.lua
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@ -4,6 +4,7 @@
-- --
local expect = require "cc.expect".expect local expect = require "cc.expect".expect
local random = require "ccryptolib.random"
local band = bit32.band local band = bit32.band
@ -134,4 +135,18 @@ function mod.mac(key, message)
return ("<I2I3I3I2I3I3"):pack(t0, t1, t2, t3, t4, t5) return ("<I2I3I3I2I3I3"):pack(t0, t1, t2, t3, t4, t5)
end end
local mac = mod.mac
--- Verifies a Poly1305 tag.
--
-- @tparam string key The key used to generate the tag.
-- @tparam string message The message to authenticate.
-- @tparam string tag The tag to check.
-- @treturn boolean Whether the tag is valid or not.
--
function mod.verify(key, message, tag)
local kaux = random.random(32)
return mac(kaux, tag) == mac(kaux, mac(key, message))
end
return mod return mod