1 files changed, 155 insertions, 0 deletions
diff --git a/server/resty/openssl/rsa.lua b/server/resty/openssl/rsa.lua
new file mode 100644
index 0000000..f3af394
--- /dev/null
+++ b/server/resty/openssl/rsa.lua
@@ -0,0 +1,155 @@
+local ffi = require "ffi"
+local C = ffi.C
+
+local bn_lib = require "resty.openssl.bn"
+
+local OPENSSL_10 = require("resty.openssl.version").OPENSSL_10
+local OPENSSL_11_OR_LATER = require("resty.openssl.version").OPENSSL_11_OR_LATER
+local format_error = require("resty.openssl.err").format_error
+
+local _M = {}
+
+_M.params = {"n", "e", "d", "p", "q", "dmp1", "dmq1", "iqmp"}
+
+local empty_table = {}
+local bn_ptrptr_ct = ffi.typeof("const BIGNUM *[1]")
+function _M.get_parameters(rsa_st)
+  -- {"n", "e", "d", "p", "q", "dmp1", "dmq1", "iqmp"}
+  return setmetatable(empty_table, {
+    __index = function(_, k)
+      local ptr, ret
+      if OPENSSL_11_OR_LATER then
+        ptr = bn_ptrptr_ct()
+      end
+
+      if k == 'n' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_key(rsa_st, ptr, nil, nil)
+        end
+      elseif k == 'e' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_key(rsa_st, nil, ptr, nil)
+        end
+      elseif k == 'd' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_key(rsa_st, nil, nil, ptr)
+        end
+      elseif k == 'p' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_factors(rsa_st, ptr, nil)
+        end
+      elseif k == 'q' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_factors(rsa_st, nil, ptr)
+        end
+      elseif k == 'dmp1' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_crt_params(rsa_st, ptr, nil, nil)
+        end
+      elseif k == 'dmq1' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_crt_params(rsa_st, nil, ptr, nil)
+        end
+      elseif k == 'iqmp' then
+        if OPENSSL_11_OR_LATER then
+          C.RSA_get0_crt_params(rsa_st, nil, nil, ptr)
+        end
+      else
+        return nil, "rsa.get_parameters: unknown parameter \"" .. k .. "\" for RSA key"
+      end
+
+      if OPENSSL_11_OR_LATER then
+        ret = ptr[0]
+      elseif OPENSSL_10 then
+        ret = rsa_st[k]
+      end
+
+      if ret == nil then
+        return nil
+      end
+      return bn_lib.dup(ret)
+    end
+  }), nil
+end
+
+local function dup_bn_value(v)
+  if not bn_lib.istype(v) then
+    return nil, "expect value to be a bn instance"
+  end
+  local bn = C.BN_dup(v.ctx)
+  if bn == nil then
+    return nil, "BN_dup() failed"
+  end
+  return bn
+end
+
+function _M.set_parameters(rsa_st, opts)
+  local err
+  local opts_bn = {}
+  -- remember which parts of BNs has been added to rsa_st, they should be freed
+  -- by RSA_free and we don't cleanup them on failure
+  local cleanup_from_idx = 1
+  -- dup input
+  local do_set_key, do_set_factors, do_set_crt_params
+  for k, v in pairs(opts) do
+    opts_bn[k], err = dup_bn_value(v)
+    if err then
+      err = "rsa.set_parameters: cannot process parameter \"" .. k .. "\":" .. err
+      goto cleanup_with_error
+    end
+    if k == "n" or k == "e" or k == "d" then
+      do_set_key = true
+    elseif k == "p" or k == "q" then
+      do_set_factors = true
+    elseif k == "dmp1" or k == "dmq1" or k == "iqmp" then
+      do_set_crt_params = true
+    end
+  end
+  if OPENSSL_11_OR_LATER then
+    -- "The values n and e must be non-NULL the first time this function is called on a given RSA object."
+    -- thus we force to set them together
+    local code
+    if do_set_key then
+      code = C.RSA_set0_key(rsa_st, opts_bn["n"], opts_bn["e"], opts_bn["d"])
+      if code == 0 then
+        err = format_error("rsa.set_parameters: RSA_set0_key")
+        goto cleanup_with_error
+      end
+    end
+    cleanup_from_idx = cleanup_from_idx + 3
+    if do_set_factors then
+      code = C.RSA_set0_factors(rsa_st, opts_bn["p"], opts_bn["q"])
+      if code == 0 then
+        err = format_error("rsa.set_parameters: RSA_set0_factors")
+        goto cleanup_with_error
+      end
+    end
+    cleanup_from_idx = cleanup_from_idx + 2
+    if do_set_crt_params then
+      code = C.RSA_set0_crt_params(rsa_st, opts_bn["dmp1"], opts_bn["dmq1"], opts_bn["iqmp"])
+      if code == 0 then
+        err = format_error("rsa.set_parameters: RSA_set0_crt_params")
+        goto cleanup_with_error
+      end
+    end
+    return true
+  elseif OPENSSL_10 then
+    for k, v in pairs(opts_bn) do
+      if rsa_st[k] ~= nil then
+        C.BN_free(rsa_st[k])
+      end
+      rsa_st[k]= v
+    end
+    return true
+  end
+
+::cleanup_with_error::
+  for i, k in pairs(_M.params) do
+    if i >= cleanup_from_idx then
+      C.BN_free(opts_bn[k])
+    end
+  end
+  return false, err
+end
+
+return _M