1 files changed, 95 insertions, 0 deletions

diff --git a/src/microhttpd/sha256_ext.c b/src/microhttpd/sha256_ext.c
new file mode 100644
index 00000000..d1c2a6ed
--- /dev/null
+++ b/src/microhttpd/sha256_ext.c
@@ -0,0 +1,95 @@
+/*
+     This file is part of GNU libmicrohttpd
+     Copyright (C) 2022 Evgeny Grin (Karlson2k)
+
+     GNU libmicrohttpd is free software; you can redistribute it and/or
+     modify it under the terms of the GNU Lesser General Public
+     License as published by the Free Software Foundation; either
+     version 2.1 of the License, or (at your option) any later version.
+
+     This library is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     Lesser General Public License for more details.
+
+     You should have received a copy of the GNU Lesser General Public
+     License along with GNU libmicrohttpd.
+     If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file microhttpd/sha256_ext.h
+ * @brief  Wrapper for SHA-256 calculation performed by TLS library
+ * @author Karlson2k (Evgeny Grin)
+ */
+
+#include <gnutls/crypto.h>
+#include "sha256_ext.h"
+#include "mhd_assert.h"
+
+
+/**
+ * Initialise structure for SHA-256 calculation, allocate resources.
+ *
+ * This function must not be called more than one time for @a ctx.
+ *
+ * @param ctx the calculation context
+ */
+void
+MHD_SHA256_init_one_time (struct Sha256CtxExt *ctx)
+{
+  ctx->handle = NULL;
+  ctx->ext_error = gnutls_hash_init (&ctx->handle, GNUTLS_DIG_SHA256);
+  if ((0 != ctx->ext_error) && (NULL != ctx->handle))
+  {
+    gnutls_free (ctx->handle);
+    ctx->handle = NULL;
+  }
+  else
+    mhd_assert (NULL != ctx->handle);
+}
+
+
+/**
+ * Process portion of bytes.
+ *
+ * @param ctx the calculation context
+ * @param data bytes to add to hash
+ * @param length number of bytes in @a data
+ */
+void
+MHD_SHA256_update (struct Sha256CtxExt *ctx,
+                   const uint8_t *data,
+                   size_t length)
+{
+  if (0 == ctx->ext_error)
+    ctx->ext_error = gnutls_hash (ctx->handle, data, length);
+}
+
+
+/**
+ * Finalise SHA-256 calculation, return digest, reset hash calculation.
+ *
+ * @param ctx the calculation context
+ * @param[out] digest set to the hash, must be #SHA256_DIGEST_SIZE bytes
+ */
+void
+MHD_SHA256_finish_reset (struct Sha256CtxExt *ctx,
+                         uint8_t digest[SHA256_DIGEST_SIZE])
+{
+  if (0 == ctx->ext_error)
+    gnutls_hash_output (ctx->handle, digest);
+}
+
+
+/**
+ * Free allocated resources.
+ *
+ * @param ctx the calculation context
+ */
+void
+MHD_SHA256_deinit (struct Sha256CtxExt *ctx)
+{
+  if (NULL != ctx->handle)
+    gnutls_hash_deinit (ctx->handle, NULL);
+}