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Issue-ID: PORTAL-1084

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

1 files changed, 116 insertions, 0 deletions

diff --git a/server/resty/openssl/digest.lua b/server/resty/openssl/digest.lua
new file mode 100644
index 0000000..cfef9ae
--- /dev/null
+++ b/server/resty/openssl/digest.lua
@@ -0,0 +1,116 @@
+local ffi = require "ffi"
+local C = ffi.C
+local ffi_gc = ffi.gc
+local ffi_str = ffi.string
+
+require "resty.openssl.include.evp.md"
+local ctypes = require "resty.openssl.auxiliary.ctypes"
+local ctx_lib = require "resty.openssl.ctx"
+local format_error = require("resty.openssl.err").format_error
+local OPENSSL_10 = require("resty.openssl.version").OPENSSL_10
+local OPENSSL_11_OR_LATER = require("resty.openssl.version").OPENSSL_11_OR_LATER
+local OPENSSL_3X = require("resty.openssl.version").OPENSSL_3X
+
+local _M = {}
+local mt = {__index = _M}
+
+local md_ctx_ptr_ct = ffi.typeof('EVP_MD_CTX*')
+
+function _M.new(typ, properties)
+  local ctx
+  if OPENSSL_11_OR_LATER then
+    ctx = C.EVP_MD_CTX_new()
+    ffi_gc(ctx, C.EVP_MD_CTX_free)
+  elseif OPENSSL_10 then
+    ctx = C.EVP_MD_CTX_create()
+    ffi_gc(ctx, C.EVP_MD_CTX_destroy)
+  end
+  if ctx == nil then
+    return nil, "digest.new: failed to create EVP_MD_CTX"
+  end
+
+  local err_new = string.format("digest.new: invalid digest type \"%s\"", typ)
+
+  local algo
+  if typ == "null" then
+    algo = C.EVP_md_null()
+  else
+    if OPENSSL_3X then
+      algo = C.EVP_MD_fetch(ctx_lib.get_libctx(), typ or 'sha1', properties)
+    else
+      algo = C.EVP_get_digestbyname(typ or 'sha1')
+    end
+    if algo == nil then
+      return nil, format_error(err_new)
+    end
+  end
+
+  local code = C.EVP_DigestInit_ex(ctx, algo, nil)
+  if code ~= 1 then
+    return nil, format_error(err_new)
+  end
+
+  return setmetatable({
+    ctx = ctx,
+    algo = algo,
+    buf = ctypes.uchar_array(OPENSSL_3X and C.EVP_MD_get_size(algo) or C.EVP_MD_size(algo)),
+  }, mt), nil
+end
+
+function _M.istype(l)
+  return l and l.ctx and ffi.istype(md_ctx_ptr_ct, l.ctx)
+end
+
+function _M:get_provider_name()
+  if not OPENSSL_3X then
+    return false, "digest:get_provider_name is not supported"
+  end
+  local p = C.EVP_MD_get0_provider(self.algo)
+  if p == nil then
+    return nil
+  end
+  return ffi_str(C.OSSL_PROVIDER_get0_name(p))
+end
+
+if OPENSSL_3X then
+  local param_lib = require "resty.openssl.param"
+  _M.settable_params, _M.set_params, _M.gettable_params, _M.get_param = param_lib.get_params_func("EVP_MD_CTX")
+end
+
+function _M:update(...)
+  for _, s in ipairs({...}) do
+    if C.EVP_DigestUpdate(self.ctx, s, #s) ~= 1 then
+      return false, format_error("digest:update")
+    end
+  end
+  return true, nil
+end
+
+local result_length = ctypes.ptr_of_uint()
+
+function _M:final(s)
+  if s then
+    if C.EVP_DigestUpdate(self.ctx, s, #s) ~= 1 then
+      return false, format_error("digest:final")
+    end
+  end
+
+  -- no return value of EVP_DigestFinal_ex
+  C.EVP_DigestFinal_ex(self.ctx, self.buf, result_length)
+  if result_length[0] == nil or result_length[0] <= 0 then
+    return nil, format_error("digest:final: EVP_DigestFinal_ex")
+  end
+  return ffi_str(self.buf, result_length[0])
+end
+
+
+function _M:reset()
+  local code = C.EVP_DigestInit_ex(self.ctx, self.algo, nil)
+  if code ~= 1 then
+    return false, format_error("digest:reset")
+  end
+
+  return true
+end
+
+return _M