Benchmarking of chacha.

ChangeLog

 2014-01-27  Niels Möller  <nisse@lysator.liu.se>
 
+	* examples/nettle-benchmark.c (main): Add benchmarking of chacha.
+	* nettle-internal.c (nettle_chacha): New const struct, for the
+	benchmark.
+
 	Chacha implementation, based on contribution by Joachim
 	Strömbergson.
 	* chacha.h: New file.

examples/nettle-benchmark.c

@@ -680,7 +680,7 @@ main(int argc, char **argv)
       &nettle_des3,
       &nettle_serpent256,
       &nettle_twofish128, &nettle_twofish192, &nettle_twofish256,
-      &nettle_salsa20, &nettle_salsa20r12,
+      &nettle_salsa20, &nettle_salsa20r12, &nettle_chacha,
       NULL
     };
 

nettle-internal.c

@@ -36,6 +36,7 @@
 #include "des.h"
 #include "eax.h"
 #include "gcm.h"
+#include "chacha.h"
 #include "salsa20.h"
 
 /* DES uses a different signature for the key set function. We ignore
@@ -79,6 +80,25 @@ nettle_des3 = {
 const struct nettle_cipher
 nettle_blowfish128 = _NETTLE_CIPHER(blowfish, BLOWFISH, 128);
 
+/* Sets a fix zero iv. For benchmarking only. */
+static void
+chacha_set_key_hack(void *ctx, size_t length, const uint8_t *key)
+{
+  static const uint8_t iv[CHACHA_IV_SIZE];
+  chacha_set_key (ctx, length, key);
+  chacha_set_iv (ctx, iv);
+}
+
+/* Claim zero block size, to classify as a stream cipher. */
+const struct nettle_cipher
+nettle_chacha = {
+  "chacha", sizeof(struct chacha_ctx),
+  0, CHACHA_KEY_SIZE,
+  chacha_set_key_hack, chacha_set_key_hack,
+  (nettle_crypt_func *) chacha_crypt,
+  (nettle_crypt_func *) chacha_crypt
+};
+
 /* Sets a fix zero iv. For benchmarking only. */
 static void
 salsa20_set_key_hack(void *ctx, size_t length, const uint8_t *key)

nettle-internal.h

@@ -61,6 +61,7 @@ extern const struct nettle_cipher nettle_des3;
 extern const struct nettle_cipher nettle_blowfish128;
 
 /* For benchmarking only, sets no iv and lies about the block size. */
+extern const struct nettle_cipher nettle_chacha;
 extern const struct nettle_cipher nettle_salsa20;
 extern const struct nettle_cipher nettle_salsa20r12;