summaryrefslogtreecommitdiffstats
path: root/src/lib/base64url.lua
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2021-03-13 07:54:12 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2021-03-13 07:54:12 +0000
commit4754ed45b607e82450a5e31fea1da3ba61433b04 (patch)
tree3554490bdc003e6004f605abe41929cdf98b0651 /src/lib/base64url.lua
parentInitial commit. (diff)
downloaddnsjit-4754ed45b607e82450a5e31fea1da3ba61433b04.tar.xz
dnsjit-4754ed45b607e82450a5e31fea1da3ba61433b04.zip
Adding upstream version 1.1.0+debian.upstream/1.1.0+debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/lib/base64url.lua')
-rw-r--r--src/lib/base64url.lua98
1 files changed, 98 insertions, 0 deletions
diff --git a/src/lib/base64url.lua b/src/lib/base64url.lua
new file mode 100644
index 0000000..e9966d5
--- /dev/null
+++ b/src/lib/base64url.lua
@@ -0,0 +1,98 @@
+-- Copyright (c) 2020, CZ.NIC, z.s.p.o.
+-- All rights reserved.
+--
+-- This file is part of dnsjit.
+--
+-- dnsjit is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- dnsjit is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with dnsjit. If not, see <http://www.gnu.org/licenses/>.
+
+-- dnsjit.lib.base64url
+-- Utility library to convert data to base64url format
+-- local base64url = require("dnsjit.lib.base64url")
+-- .SS Encoding and decoding lua strings
+-- local encoded = base64url.encode("abcd")
+-- local decoded = base64url.decode(encoded)
+-- .SS Encoding C byte arrays
+-- local pl -- pl is core.object.payload
+-- local encoded = base64url.encode(pl.payload, pl.len)
+--
+-- Encode and decode data to/from base64url format.
+module(...,package.seeall)
+
+require("dnsjit.lib.base64url_h")
+local ffi = require("ffi")
+local C = ffi.C
+local log = require("dnsjit.core.log")
+local module_log = log.new("lib.base64url")
+
+Base64Url = {}
+
+-- Encode lua string or C byte array to base64url representation.
+-- The input string may contain non-printable characters.
+--
+-- .B data_len
+-- is length of the input data (optional for lua strings, required for
+-- C byte arrays).
+function Base64Url.encode(data, data_len)
+ data_len = tonumber(data_len) -- in case of cdata length
+ if type(data) == "cdata" then
+ if type(data_len) ~= "number" then
+ module_log:fatal("encode: data_len must be specified for cdata")
+ return
+ end
+ elseif type(data) ~= "string" then
+ module_log:fatal("encode: input must be string")
+ return
+ end
+
+ if data_len ~= nil and data_len < 0 then
+ module_log:fatal("encode: data_len must be greater than 0")
+ return
+ end
+
+ local in_len = data_len or string.len(data)
+ local buf_len = math.ceil(4 * in_len / 3) + 2
+ local buf = ffi.new("uint8_t[?]", buf_len)
+ local out_len = ffi.C.base64url_encode(data, in_len, buf, buf_len)
+ if out_len < 0 then
+ module_log:critical("encode: error ("..log.errstr(-out_len)..")")
+ return
+ end
+ return ffi.string(buf, out_len)
+end
+
+-- Decode a base64url encoded lua string.
+-- The output string may contain non-printable characters.
+function Base64Url.decode(data)
+ if type(data) ~= "string" then
+ module_log:fatal("decode: input must be string")
+ return
+ end
+
+ local in_len = string.len(data)
+ local buf_len = math.ceil(3 * in_len / 4) + 1
+ local buf = ffi.new("uint8_t[?]", buf_len)
+ local out_len = ffi.C.base64url_decode(data, in_len, buf, buf_len)
+ if out_len == -34 then -- ERANGE
+ module_log:critical("decode: error "..log.errstr(-out_len).." - invalid character(s) in input string?")
+ return
+ elseif out_len < 0 then
+ module_log:critical("decode: error "..log.errstr(-out_len))
+ return
+ end
+ return ffi.string(buf, out_len)
+end
+
+-- dnsjit.core.object.payload(3)
+-- dnsjit.output.dnssim (3)
+return Base64Url