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Issue-ID: PORTAL-1084

Signed-off-by: Fiete Ostkamp <Fiete.Ostkamp@telekom.de>
Change-Id: Id0c94859a775094e67b0bb9c91ca5e776a08c068

1 files changed, 96 insertions, 0 deletions

diff --git a/server/resty/openssl/mac.lua b/server/resty/openssl/mac.lua
new file mode 100644
index 0000000..65f5e38
--- /dev/null
+++ b/server/resty/openssl/mac.lua
@@ -0,0 +1,96 @@
+local ffi = require "ffi"
+local C = ffi.C
+local ffi_gc = ffi.gc
+local ffi_str = ffi.string
+
+require "resty.openssl.include.evp.mac"
+local param_lib = require "resty.openssl.param"
+local ctx_lib = require "resty.openssl.ctx"
+local ctypes = require "resty.openssl.auxiliary.ctypes"
+local format_error = require("resty.openssl.err").format_error
+local OPENSSL_3X = require("resty.openssl.version").OPENSSL_3X
+
+local _M = {}
+local mt = {__index = _M}
+
+local mac_ctx_ptr_ct = ffi.typeof('EVP_MAC_CTX*')
+local param_types = {
+  cipher = param_lib.OSSL_PARAM_UTF8_STRING,
+  digest = param_lib.OSSL_PARAM_UTF8_STRING,
+}
+local params = {}
+
+function _M.new(key, typ, cipher, digest, properties)
+  if not OPENSSL_3X then
+    return false, "EVP_MAC is only supported from OpenSSL 3.0"
+  end
+
+  local algo = C.EVP_MAC_fetch(ctx_lib.get_libctx(), typ, properties)
+  if algo == nil then
+    return nil, format_error(string.format("mac.new: invalid mac type \"%s\"", typ))
+  end
+
+  local ctx = C.EVP_MAC_CTX_new(algo)
+  if ctx == nil then
+    return nil, "mac.new: failed to create EVP_MAC_CTX"
+  end
+  ffi_gc(ctx, C.EVP_MAC_CTX_free)
+  
+  params.digest = digest
+  params.cipher = cipher
+  local p = param_lib.construct(params, 2, param_types)
+
+  local code = C.EVP_MAC_init(ctx, key, #key, p)
+  if code ~= 1 then
+    return nil, format_error(string.format("mac.new: invalid cipher or digest type"))
+  end
+
+  local md_size = C.EVP_MAC_CTX_get_mac_size(ctx)
+
+  return setmetatable({
+    ctx = ctx,
+    algo = algo,
+    buf = ctypes.uchar_array(md_size),
+    buf_size = md_size,
+  }, mt), nil
+end
+
+function _M.istype(l)
+  return l and l.ctx and ffi.istype(mac_ctx_ptr_ct, l.ctx)
+end
+
+function _M:get_provider_name()
+  local p = C.EVP_MAC_get0_provider(self.algo)
+  if p == nil then
+    return nil
+  end
+  return ffi_str(C.OSSL_PROVIDER_get0_name(p))
+end
+
+_M.settable_params, _M.set_params, _M.gettable_params, _M.get_param = param_lib.get_params_func("EVP_MAC_CTX")
+
+function _M:update(...)
+  for _, s in ipairs({...}) do
+    if C.EVP_MAC_update(self.ctx, s, #s) ~= 1 then
+      return false, format_error("digest:update")
+    end
+  end
+  return true, nil
+end
+
+function _M:final(s)
+  if s then
+    local _, err = self:update(s)
+    if err then
+      return nil, err
+    end
+  end
+
+  local length = ctypes.ptr_of_size_t()
+  if C.EVP_MAC_final(self.ctx, self.buf, length, self.buf_size) ~= 1 then
+    return nil, format_error("digest:final: EVP_MAC_final")
+  end
+  return ffi_str(self.buf, length[0])
+end
+
+return _M