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local ffi = require "ffi"
local C = ffi.C
local ffi_gc = ffi.gc
require "resty.openssl.include.ec"
local bn_lib = require "resty.openssl.bn"
local objects_lib = require "resty.openssl.objects"
local ctypes = require "resty.openssl.auxiliary.ctypes"
local version_num = require("resty.openssl.version").version_num
local format_error = require("resty.openssl.err").format_error
local BORINGSSL = require("resty.openssl.version").BORINGSSL
local _M = {}
_M.params = {"group", "public", "private", "x", "y"}
local empty_table = {}
function _M.get_parameters(ec_key_st)
return setmetatable(empty_table, {
__index = function(_, k)
local group = C.EC_KEY_get0_group(ec_key_st)
local bn
if k == 'group' then
local nid = C.EC_GROUP_get_curve_name(group)
if nid == 0 then
return nil, "ec.get_parameters: EC_GROUP_get_curve_name() failed"
end
return nid
elseif k == 'public' or k == "pub_key" then
local pub_point = C.EC_KEY_get0_public_key(ec_key_st)
if pub_point == nil then
return nil, format_error("ec.get_parameters: EC_KEY_get0_public_key")
end
local point_form = C.EC_KEY_get_conv_form(ec_key_st)
if point_form == nil then
return nil, format_error("ec.get_parameters: EC_KEY_get_conv_form")
end
if BORINGSSL then
local sz = tonumber(C.EC_POINT_point2oct(group, pub_point, point_form, nil, 0, bn_lib.bn_ctx_tmp))
if sz <= 0 then
return nil, format_error("ec.get_parameters: EC_POINT_point2oct")
end
local buf = ctypes.uchar_array(sz)
C.EC_POINT_point2oct(group, pub_point, point_form, buf, sz, bn_lib.bn_ctx_tmp)
buf = ffi.string(buf, sz)
local err
bn, err = bn_lib.from_binary(buf)
if bn == nil then
return nil, "ec.get_parameters: bn_lib.from_binary: " .. err
end
return bn
else
bn = C.EC_POINT_point2bn(group, pub_point, point_form, nil, bn_lib.bn_ctx_tmp)
if bn == nil then
return nil, format_error("ec.get_parameters: EC_POINT_point2bn")
end
ffi_gc(bn, C.BN_free)
end
elseif k == 'private' or k == "priv_key" then
-- get0, don't GC
bn = C.EC_KEY_get0_private_key(ec_key_st)
elseif k == 'x' or k == 'y' then
local pub_point = C.EC_KEY_get0_public_key(ec_key_st)
if pub_point == nil then
return nil, format_error("ec.get_parameters: EC_KEY_get0_public_key")
end
bn = C.BN_new()
if bn == nil then
return nil, "ec.get_parameters: BN_new() failed"
end
ffi_gc(bn, C.BN_free)
local f
if version_num >= 0x10101000 then
f = C.EC_POINT_get_affine_coordinates
else
f = C.EC_POINT_get_affine_coordinates_GFp
end
local code
if k == 'x' then
code = f(group, pub_point, bn, nil, bn_lib.bn_ctx_tmp)
else
code = f(group, pub_point, nil, bn, bn_lib.bn_ctx_tmp)
end
if code ~= 1 then
return nil, format_error("ec.get_parameters: EC_POINT_get_affine_coordinates")
end
else
return nil, "ec.get_parameters: unknown parameter \"" .. k .. "\" for EC key"
end
if bn == nil then
return nil
end
return bn_lib.dup(bn)
end
}), nil
end
function _M.set_parameters(ec_key_st, opts)
for _, k in ipairs(_M.params) do
if k ~= "group" then
if opts[k] and not bn_lib.istype(opts[k]) then
return nil, "expect parameter \"" .. k .. "\" to be a bn instance"
end
end
end
local group_nid = opts["group"]
local group
if group_nid then
local nid, err = objects_lib.txtnid2nid(group_nid)
if err then
return nil, "ec.set_parameters: cannot use parameter \"group\":" .. err
end
group = C.EC_GROUP_new_by_curve_name(nid)
if group == nil then
return nil, "ec.set_parameters: EC_GROUP_new_by_curve_name() failed"
end
ffi_gc(group, C.EC_GROUP_free)
-- # define OPENSSL_EC_NAMED_CURVE 0x001
C.EC_GROUP_set_asn1_flag(group, 1)
C.EC_GROUP_set_point_conversion_form(group, C.POINT_CONVERSION_UNCOMPRESSED)
if C.EC_KEY_set_group(ec_key_st, group) ~= 1 then
return nil, format_error("ec.set_parameters: EC_KEY_set_group")
end
end
local x = opts["x"]
local y = opts["y"]
local pub = opts["public"]
if (x and not y) or (y and not x) then
return nil, "ec.set_parameters: \"x\" and \"y\" parameter must be defined at same time or both undefined"
end
if x and y then
if pub then
return nil, "ec.set_parameters: cannot set \"x\" and \"y\" with \"public\" at same time to set public key"
end
-- double check if we have set group already
if group == nil then
group = C.EC_KEY_get0_group(ec_key_st)
if group == nil then
return nil, "ec.set_parameters: cannot set public key without setting \"group\""
end
end
if C.EC_KEY_set_public_key_affine_coordinates(ec_key_st, x.ctx, y.ctx) ~= 1 then
return nil, format_error("ec.set_parameters: EC_KEY_set_public_key_affine_coordinates")
end
end
if pub then
if group == nil then
group = C.EC_KEY_get0_group(ec_key_st)
if group == nil then
return nil, "ec.set_parameters: cannot set public key without setting \"group\""
end
end
local point = C.EC_POINT_bn2point(group, pub.ctx, nil, bn_lib.bn_ctx_tmp)
if point == nil then
return nil, format_error("ec.set_parameters: EC_POINT_bn2point")
end
ffi_gc(point, C.EC_POINT_free)
if C.EC_KEY_set_public_key(ec_key_st, point) ~= 1 then
return nil, format_error("ec.set_parameters: EC_KEY_set_public_key")
end
end
local priv = opts["private"]
if priv then
-- openssl duplicates it inside
if C.EC_KEY_set_private_key(ec_key_st, priv.ctx) ~= 1 then
return nil, format_error("ec.set_parameters: EC_KEY_set_private_key")
end
end
end
return _M
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