1 files changed, 134 insertions, 0 deletions
diff --git a/libotr/libgcrypt-1.8.7/random/jitterentropy-base-user.h b/libotr/libgcrypt-1.8.7/random/jitterentropy-base-user.h
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index 0000000..8a8dbd5
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+++ b/libotr/libgcrypt-1.8.7/random/jitterentropy-base-user.h
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+/*
+ * Non-physical true random number generator based on timing jitter.
+ *
+ * Copyright Stephan Mueller <smueller@chronox.de>, 2013
+ *
+ * License
+ * =======
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. 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.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU General Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
+ * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
+#ifndef GCRYPT_JITTERENTROPY_BASE_USER_H
+#define GCRYPT_JITTERENTROPY_BASE_USER_H
+
+/*
+ * This is Libgcrypt specific platform dependent code.  We use a
+ * separate file because jitterentropy.h expects such a file.
+ */
+
+#ifndef USE_JENT
+# error This file expects to be included from rndjent.c (via jitterentropy.h)
+#endif
+#ifndef HAVE_STDINT_H
+# error This module needs stdint.h - try ./configure --disable-jent-support
+#endif
+
+
+/* When using the libgcrypt secure memory mechanism, all precautions
+ * are taken to protect our state.  If the user disables secmem during
+ * runtime, it is his decision and we thus try not to overrule his
+ * decision for less memory protection.  */
+#define JENT_CPU_JITTERENTROPY_SECURE_MEMORY 1
+#define jent_zalloc(n) _gcry_calloc_secure (1, (n))
+
+
+static void
+jent_get_nstime(u64 *out)
+{
+#if USE_JENT == JENT_USES_RDTSC
+
+  u32 t_eax, t_edx;
+
+  asm volatile (".byte 0x0f,0x31\n\t"
+                : "=a" (t_eax), "=d" (t_edx)
+                );
+  *out = (((u64)t_edx << 32) | t_eax);
+
+#elif USE_JENT == JENT_USES_GETTIME
+
+  struct timespec tv;
+  u64 tmp;
+
+  /* On Linux we could use CLOCK_MONOTONIC(_RAW), but with
+   * CLOCK_REALTIME we get some nice extra entropy once in a while
+   * from the NTP actions that we want to use as well... though, we do
+   * not rely on that extra little entropy.  */
+  if (!clock_gettime (CLOCK_REALTIME, &tv))
+    {
+      tmp = tv.tv_sec;
+      tmp = tmp << 32;
+      tmp = tmp | tv.tv_nsec;
+    }
+  else
+    tmp = 0;
+  *out = tmp;
+
+#elif USE_JENT == JENT_USES_READ_REAL_TIME
+
+  /* clock_gettime() on AIX returns a timer value that increments in
+   * steps of 1000.  */
+  u64 tmp = 0;
+
+  timebasestruct_t aixtime;
+  read_real_time (&aixtime, TIMEBASE_SZ);
+  tmp = aixtime.tb_high;
+  tmp = tmp << 32;
+  tmp = tmp | aixtime.tb_low;
+  *out = tmp;
+
+#else
+# error No clock available in jent_get_nstime
+#endif
+}
+
+
+static GPGRT_INLINE void
+jent_zfree (void *ptr, unsigned int len)
+{
+  if (ptr)
+    {
+      wipememory (ptr, len);
+      _gcry_free (ptr);
+    }
+}
+
+
+static GPGRT_INLINE int
+jent_fips_enabled(void)
+{
+  return fips_mode();
+}
+
+
+#endif /* GCRYPT_JITTERENTROPY_BASE_USER_H */