Use cryptobox chacha for libottery.

1 files changed, 64 insertions, 0 deletions

diff --git a/contrib/libottery/chacha_cryptobox.c b/contrib/libottery/chacha_cryptobox.c
new file mode 100644
index 000000000..ecbcccaf3
--- /dev/null
+++ b/contrib/libottery/chacha_cryptobox.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2015, Vsevolod Stakhov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *	 * Redistributions of source code must retain the above copyright
+ *	   notice, this list of conditions and the following disclaimer.
+ *	 * Redistributions in binary form must reproduce the above copyright
+ *	   notice, this list of conditions and the following disclaimer in the
+ *	   documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ottery-internal.h"
+#include "libcryptobox/chacha20/chacha.h"
+
+#define STATE_LEN   (sizeof(chacha_state))
+#define STATE_BYTES 40
+
+#define IDX_STEP    16
+#define OUTPUT_LEN  (IDX_STEP * 64)
+
+static void
+chacha_cryptobox_state_setup (void *state_, const uint8_t *bytes)
+{
+	chacha_state *x = state_;
+	chacha_init (x, (chacha_key *)bytes, (chacha_iv *)(bytes + 32), 20);
+}
+
+static void
+chacha20_cryptobox_generate (void *state_, uint8_t *output, uint32_t idx)
+{
+	chacha_state *x = state_;
+
+	memset (output, 0, OUTPUT_LEN);
+	memcpy (output, &idx, sizeof (idx));
+	chacha_update (x, output, output, OUTPUT_LEN);
+}
+
+#define PRF_CHACHA(r) {                         \
+  "CHACHA" #r,                                  \
+  "CHACHA" #r "-NOSIMD",                        \
+  "CHACHA" #r "-NOSIMD-DEFAULT",                \
+  STATE_LEN,                                    \
+  STATE_BYTES,                                  \
+  OUTPUT_LEN,                                   \
+  0,                                            \
+  chacha_cryptobox_state_setup,                    \
+  chacha ## r ## _cryptobox_generate               \
+}
+
+const struct ottery_prf ottery_prf_chacha20_cryptobox_ = PRF_CHACHA(20);