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--[[
Copyright (c) 2020, Vsevolod Stakhov <vsevolod@highsecure.ru>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
local ts = require("tableshape").types
local exports = {}
local cr_hash = require 'rspamd_cryptobox_hash'
local blake2b_key = cr_hash.create_specific('blake2'):update('rspamd'):bin()
local function digest_schema()
return {ts.one_of{'hex', 'base32', 'bleach32', 'rbase32', 'base64'}:is_optional(),
ts.one_of{'blake2', 'sha256', 'sha1', 'sha512', 'md5'}:is_optional()}
end
exports.digest_schema = digest_schema
local function create_raw_digest(data, args)
local ht = args[2] or 'blake2'
local h
if ht == 'blake2' then
-- Hack to be compatible with various 'get_digest' methods
h = cr_hash.create_keyed(blake2b_key):update(data)
else
h = cr_hash.create_specific(ht):update(data)
end
return h
end
local function encode_digest(h, args)
local encoding = args[1] or 'hex'
local s
if encoding == 'hex' then
s = h:hex()
elseif encoding == 'base32' then
s = h:base32()
elseif encoding == 'bleach32' then
s = h:base32('bleach')
elseif encoding == 'rbase32' then
s = h:base32('rfc')
elseif encoding == 'base64' then
s = h:base64()
end
return s
end
local function create_digest(data, args)
local h = create_raw_digest(data, args)
return encode_digest(h, args)
end
local function get_cached_or_raw_digest(task, idx, mime_part, args)
if #args == 0 then
-- Optimise as we already have this hash in the API
return mime_part:get_digest()
end
local ht = args[2] or 'blake2'
local cache_key = 'mp_digest_' .. ht .. tostring(idx)
local cached = task:cache_get(cache_key)
if cached then
return encode_digest(cached, args)
end
local h = create_raw_digest(mime_part:get_content('raw_parsed'), args)
task:cache_set(cache_key, h)
return encode_digest(h, args)
end
exports.create_digest = create_digest
exports.create_raw_digest = create_raw_digest
exports.get_cached_or_raw_digest = get_cached_or_raw_digest
exports.encode_digest = encode_digest
return exports
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