add ./external/libsodium/

external/libsodium/include/sodium/crypto_verify_16.h

@@ -0,0 +1,23 @@
+#ifndef crypto_verify_16_H
+#define crypto_verify_16_H
+
+#include <stddef.h>
+#include "export.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define crypto_verify_16_BYTES 16U
+SODIUM_EXPORT
+size_t crypto_verify_16_bytes(void);
+
+SODIUM_EXPORT
+int crypto_verify_16(const unsigned char *x, const unsigned char *y)
+            __attribute__ ((warn_unused_result));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

external/libsodium/include/sodium/crypto_verify_32.h

@@ -0,0 +1,23 @@
+#ifndef crypto_verify_32_H
+#define crypto_verify_32_H
+
+#include <stddef.h>
+#include "export.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define crypto_verify_32_BYTES 32U
+SODIUM_EXPORT
+size_t crypto_verify_32_bytes(void);
+
+SODIUM_EXPORT
+int crypto_verify_32(const unsigned char *x, const unsigned char *y)
+            __attribute__ ((warn_unused_result));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

external/libsodium/include/sodium/crypto_verify_64.h

@@ -0,0 +1,23 @@
+#ifndef crypto_verify_64_H
+#define crypto_verify_64_H
+
+#include <stddef.h>
+#include "export.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define crypto_verify_64_BYTES 64U
+SODIUM_EXPORT
+size_t crypto_verify_64_bytes(void);
+
+SODIUM_EXPORT
+int crypto_verify_64(const unsigned char *x, const unsigned char *y)
+            __attribute__ ((warn_unused_result));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

external/libsodium/src/crypto_verify/verify.c

@@ -0,0 +1,98 @@
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "crypto_verify_16.h"
+#include "crypto_verify_32.h"
+#include "crypto_verify_64.h"
+
+size_t
+crypto_verify_16_bytes(void)
+{
+    return crypto_verify_16_BYTES;
+}
+
+size_t
+crypto_verify_32_bytes(void)
+{
+    return crypto_verify_32_BYTES;
+}
+
+size_t
+crypto_verify_64_bytes(void)
+{
+    return crypto_verify_64_BYTES;
+}
+
+#if defined(HAVE_EMMINTRIN_H) && defined(__SSE2__)
+
+# ifdef __GNUC__
+#  pragma GCC target("sse2")
+# endif
+# include <emmintrin.h>
+
+static inline int
+crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
+                const int n)
+{
+    const    __m128i zero = _mm_setzero_si128();
+    volatile __m128i v1, v2, z;
+    volatile int     m;
+    int              i;
+
+    const volatile __m128i *volatile x =
+        (const volatile __m128i *volatile) (const void *) x_;
+    const volatile __m128i *volatile y =
+        (const volatile __m128i *volatile) (const void *) y_;
+    v1 = _mm_loadu_si128((const __m128i *) &x[0]);
+    v2 = _mm_loadu_si128((const __m128i *) &y[0]);
+    z = _mm_xor_si128(v1, v2);
+    for (i = 1; i < n / 16; i++) {
+        v1 = _mm_loadu_si128((const __m128i *) &x[i]);
+        v2 = _mm_loadu_si128((const __m128i *) &y[i]);
+        z = _mm_or_si128(z, _mm_xor_si128(v1, v2));
+    }
+    m = _mm_movemask_epi8(_mm_cmpeq_epi32(z, zero));
+    v1 = zero; v2 = zero; z = zero;
+
+    return (int) (((uint32_t) m + 1U) >> 16) - 1;
+}
+
+#else
+
+static inline int
+crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
+                const int n)
+{
+    const volatile unsigned char *volatile x =
+        (const volatile unsigned char *volatile) x_;
+    const volatile unsigned char *volatile y =
+        (const volatile unsigned char *volatile) y_;
+    volatile uint_fast16_t d = 0U;
+    int i;
+
+    for (i = 0; i < n; i++) {
+        d |= x[i] ^ y[i];
+    }
+    return (1 & ((d - 1) >> 8)) - 1;
+}
+
+#endif
+
+int
+crypto_verify_16(const unsigned char *x, const unsigned char *y)
+{
+    return crypto_verify_n(x, y, crypto_verify_16_BYTES);
+}
+
+int
+crypto_verify_32(const unsigned char *x, const unsigned char *y)
+{
+    return crypto_verify_n(x, y, crypto_verify_32_BYTES);
+}
+
+int
+crypto_verify_64(const unsigned char *x, const unsigned char *y)
+{
+    return crypto_verify_n(x, y, crypto_verify_64_BYTES);
+}