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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 format_error = require("resty.openssl.err").format_error

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

        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)
      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 code
        if k == 'x' then
          code = C.EC_POINT_get_affine_coordinates(group, pub_point, bn, nil, bn_lib.bn_ctx_tmp)
        else
          code = C.EC_POINT_get_affine_coordinates(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

  return true

end

return _M

Filemanager

DIR : / opt/ imunify360-webshield/ lualib/ resty/ openssl/
Name Type Size Permission Actions
auxiliary Folder 0755
include Folder 0755
x509 Folder 0755
asn1.lua File 2.53 KB 0644
bn.lua File 9.36 KB 0644
cipher.lua File 8.79 KB 0644
crypto.lua File 489 B 0644
ctx.lua File 1.59 KB 0644
dh.lua File 2.59 KB 0644
digest.lua File 2.67 KB 0644
ec.lua File 5.04 KB 0644
ecx.lua File 2.02 KB 0644
err.lua File 2.94 KB 0644
hmac.lua File 1.95 KB 0644
kdf.lua File 11.26 KB 0644
mac.lua File 2.71 KB 0644
objects.lua File 1.69 KB 0644
param.lua File 10.92 KB 0644
pkcs12.lua File 4.72 KB 0644
pkey.lua File 31.17 KB 0644
provider.lua File 3.44 KB 0644
rand.lua File 1.33 KB 0644
rsa.lua File 3.43 KB 0644
ssl.lua File 8.56 KB 0644
ssl_ctx.lua File 2.11 KB 0644
stack.lua File 3.69 KB 0644
version.lua File 2.86 KB 0644