1 files changed, 92 insertions, 0 deletions
diff --git a/lib/nettle/gost/magma.c b/lib/nettle/gost/magma.c
new file mode 100644
index 0000000..60d3e44
--- /dev/null
+++ b/lib/nettle/gost/magma.c
@@ -0,0 +1,92 @@
+/* magma.c - GOST R 34.12-2015 (Magma) cipher implementation
+ *
+ * Copyright: 2017 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef HAVE_NETTLE_MAGMA_SET_KEY
+
+#include <assert.h>
+
+#include <nettle/macros.h>
+#include "nettle-write.h"
+#include "magma.h"
+#ifndef HAVE_NETTLE_GOST28147_SET_KEY
+#include "gost28147.h"
+#else
+#include <nettle/gost28147.h>
+#endif
+
+void
+magma_set_key(struct magma_ctx *ctx, const uint8_t *key)
+{
+  unsigned i;
+
+  for (i = 0; i < 8; i++, key += 4)
+    ctx->key[i] = READ_UINT32(key);
+}
+
+void
+magma_encrypt(const struct magma_ctx *ctx,
+	      size_t length, uint8_t *dst,
+	      const uint8_t *src)
+{
+  uint32_t block[2];
+
+  assert(!(length % MAGMA_BLOCK_SIZE));
+
+  while (length)
+    {
+      block[1] = READ_UINT32(src); src += 4;
+      block[0] = READ_UINT32(src); src += 4;
+      gost28147_encrypt_simple(ctx->key, gost28147_param_TC26_Z.sbox,
+			       block, block);
+      WRITE_UINT32(dst, block[1]); dst += 4;
+      WRITE_UINT32(dst, block[0]); dst += 4;
+      length -= MAGMA_BLOCK_SIZE;
+    }
+}
+
+void
+magma_decrypt(const struct magma_ctx *ctx,
+	      size_t length, uint8_t *dst,
+	      const uint8_t *src)
+{
+  uint32_t block[2];
+
+  assert(!(length % MAGMA_BLOCK_SIZE));
+
+  while (length)
+    {
+      block[1] = READ_UINT32(src); src += 4;
+      block[0] = READ_UINT32(src); src += 4;
+      gost28147_decrypt_simple(ctx->key, gost28147_param_TC26_Z.sbox,
+			       block, block);
+      WRITE_UINT32(dst, block[1]); dst += 4;
+      WRITE_UINT32(dst, block[0]); dst += 4;
+      length -= MAGMA_BLOCK_SIZE;
+    }
+}
+#endif /* HAVE_NETTLE_MAGMA_SET_KEY */