From 51fb0f4c6484c45ffe4e75655e05538f4294c870 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Tue, 23 Apr 2013 11:56:10 -0700
Subject: [PATCH] Add sodium_memcmp()

---
 src/libsodium/include/sodium/utils.h |  3 +++
 src/libsodium/sodium/utils.c         | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/libsodium/include/sodium/utils.h b/src/libsodium/include/sodium/utils.h
index ff6cdf9d..149a5cdf 100644
--- a/src/libsodium/include/sodium/utils.h
+++ b/src/libsodium/include/sodium/utils.h
@@ -16,6 +16,9 @@ unsigned char *_sodium_alignedcalloc(unsigned char ** const unaligned_p,
 SODIUM_EXPORT
 void sodium_memzero(void * const pnt, const size_t len);
 
+SODIUM_EXPORT
+int sodium_memcmp(const void * const b1_, const void * const b2_, size_t size);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/libsodium/sodium/utils.c b/src/libsodium/sodium/utils.c
index 70ff1136..784a3a4f 100644
--- a/src/libsodium/sodium/utils.c
+++ b/src/libsodium/sodium/utils.c
@@ -27,6 +27,20 @@ sodium_memzero(void * const pnt, const size_t len)
 #endif
 }
 
+int
+sodium_memcmp(const void * const b1_, const void * const b2_, size_t size)
+{
+    const unsigned char *b1 = b1_;
+    const unsigned char *b2 = b2_;
+    size_t               i;
+    unsigned char        d = (unsigned char) 0U;
+
+    for (i = 0U; i < size; i++) {
+        d |= b1[i] ^ b2[i];
+    }
+    return (int) d;
+}
+
 unsigned char *
 _sodium_alignedcalloc(unsigned char ** const unaligned_p, const size_t len)
 {