Consolidate the non-canonical epoch timers, like cpuid and Win32's

QueryPerformanceCounter, into an entropy source hres_timer. Its
results, if any, do not count as contributing entropy to the poll.

Convert the other (monotonic/fixed epoch) timers to a single function
get_nanoseconds_clock(), living in time.h, which statically chooses
the 'best' timer type (clock_gettime, gettimeofday, std::clock, in
that order depending on what is available). Add feature test macros
for clock_gettime and gettimeofday.

Remove the Timer class and timer.h. Remove the Timer& argument to the
algorithm benchmark function.

46 files changed, 216 insertions, 457 deletions

diff --git a/src/asn1/asn1_tm.cpp b/src/asn1/asn1_tm.cpp
index 09bc4d347..c57d1bc73 100644
--- a/src/asn1/asn1_tm.cpp
+++ b/src/asn1/asn1_tm.cpp
@@ -10,7 +10,7 @@
 #include <botan/ber_dec.h>
 #include <botan/charset.h>
 #include <botan/parsing.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 
 namespace Botan {
 
diff --git a/src/asn1/info.txt b/src/asn1/info.txt
index 621b8b628..d836b4c0b 100644
--- a/src/asn1/info.txt
+++ b/src/asn1/info.txt
@@ -26,5 +26,4 @@ alloc
 bigint
 filters
 oid_lookup
-timer
 </requires>
diff --git a/src/benchmark/benchmark.cpp b/src/benchmark/benchmark.cpp
index 41c9cd10c..69d3a40ec 100644
--- a/src/benchmark/benchmark.cpp
+++ b/src/benchmark/benchmark.cpp
@@ -11,6 +11,7 @@
 #include <botan/stream_cipher.h>
 #include <botan/hash.h>
 #include <botan/mac.h>
+#include <botan/time.h>
 #include <memory>
 
 namespace Botan {
@@ -21,19 +22,19 @@ namespace {
 * Benchmark BufferedComputation (hash or MAC)
 */
 std::pair<u64bit, u64bit> bench_buf_comp(BufferedComputation* buf_comp,
-                                         Timer& timer,
                                          u64bit nanoseconds_max,
                                          const byte buf[], u32bit buf_len)
    {
-   const u64bit start = timer.clock();
-   u64bit nanoseconds_used = 0;
    u64bit reps = 0;
 
+   const u64bit start = get_nanoseconds_clock();
+   u64bit nanoseconds_used = 0;
+
    while(nanoseconds_used < nanoseconds_max)
       {
       buf_comp->update(buf, buf_len);
       ++reps;
-      nanoseconds_used = timer.clock() - start;
+      nanoseconds_used = get_nanoseconds_clock() - start;
       }
 
    return std::make_pair(reps * buf_len, nanoseconds_used);
@@ -44,15 +45,15 @@ std::pair<u64bit, u64bit> bench_buf_comp(BufferedComputation* buf_comp,
 */
 std::pair<u64bit, u64bit>
 bench_block_cipher(BlockCipher* block_cipher,
-                   Timer& timer,
                    u64bit nanoseconds_max,
                    byte buf[], u32bit buf_len)
    {
-   const u64bit start = timer.clock();
-   u64bit nanoseconds_used = 0;
+   const u32bit in_blocks = buf_len / block_cipher->BLOCK_SIZE;
+
    u64bit reps = 0;
 
-   const u32bit in_blocks = buf_len / block_cipher->BLOCK_SIZE;
+   const u64bit start = get_nanoseconds_clock();
+   u64bit nanoseconds_used = 0;
 
    block_cipher->set_key(buf, block_cipher->MAXIMUM_KEYLENGTH);
 
@@ -61,7 +62,7 @@ bench_block_cipher(BlockCipher* block_cipher,
       block_cipher->encrypt_n(buf, buf, in_blocks);
 
       ++reps;
-      nanoseconds_used = timer.clock() - start;
+      nanoseconds_used = get_nanoseconds_clock() - start;
       }
 
    return std::make_pair(reps * in_blocks * block_cipher->BLOCK_SIZE,
@@ -73,21 +74,21 @@ bench_block_cipher(BlockCipher* block_cipher,
 */
 std::pair<u64bit, u64bit>
 bench_stream_cipher(StreamCipher* stream_cipher,
-                    Timer& timer,
                     u64bit nanoseconds_max,
                     byte buf[], u32bit buf_len)
    {
-   const u64bit start = timer.clock();
-   u64bit nanoseconds_used = 0;
    u64bit reps = 0;
 
+   const u64bit start = get_nanoseconds_clock();
+   u64bit nanoseconds_used = 0;
+
    stream_cipher->set_key(buf, stream_cipher->MAXIMUM_KEYLENGTH);
 
    while(nanoseconds_used < nanoseconds_max)
       {
       stream_cipher->cipher1(buf, buf_len);
       ++reps;
-      nanoseconds_used = timer.clock() - start;
+      nanoseconds_used = get_nanoseconds_clock() - start;
       }
 
    return std::make_pair(reps * buf_len, nanoseconds_used);
@@ -97,11 +98,11 @@ bench_stream_cipher(StreamCipher* stream_cipher,
 * Benchmark hash
 */
 std::pair<u64bit, u64bit>
-bench_hash(HashFunction* hash, Timer& timer,
+bench_hash(HashFunction* hash,
            u64bit nanoseconds_max,
            const byte buf[], u32bit buf_len)
    {
-   return bench_buf_comp(hash, timer, nanoseconds_max, buf, buf_len);
+   return bench_buf_comp(hash, nanoseconds_max, buf, buf_len);
    }
 
 /**
@@ -109,12 +110,11 @@ bench_hash(HashFunction* hash, Timer& timer,
 */
 std::pair<u64bit, u64bit>
 bench_mac(MessageAuthenticationCode* mac,
-          Timer& timer,
           u64bit nanoseconds_max,
           const byte buf[], u32bit buf_len)
    {
    mac->set_key(buf, mac->MAXIMUM_KEYLENGTH);
-   return bench_buf_comp(mac, timer, nanoseconds_max, buf, buf_len);
+   return bench_buf_comp(mac, nanoseconds_max, buf, buf_len);
    }
 
 }
@@ -122,7 +122,6 @@ bench_mac(MessageAuthenticationCode* mac,
 std::map<std::string, double>
 algorithm_benchmark(const std::string& name,
                     u32bit milliseconds,
-                    Timer& timer,
                     RandomNumberGenerator& rng,
                     Algorithm_Factory& af)
    {
@@ -148,7 +147,7 @@ algorithm_benchmark(const std::string& name,
             af.prototype_block_cipher(name, provider))
          {
          std::auto_ptr<BlockCipher> block_cipher(proto->clone());
-         results = bench_block_cipher(block_cipher.get(), timer,
+         results = bench_block_cipher(block_cipher.get(),
                                       ns_per_provider,
                                       &buf[0], buf.size());
          }
@@ -156,7 +155,7 @@ algorithm_benchmark(const std::string& name,
                  af.prototype_stream_cipher(name, provider))
          {
          std::auto_ptr<StreamCipher> stream_cipher(proto->clone());
-         results = bench_stream_cipher(stream_cipher.get(), timer,
+         results = bench_stream_cipher(stream_cipher.get(),
                                        ns_per_provider,
                                        &buf[0], buf.size());
          }
@@ -164,14 +163,14 @@ algorithm_benchmark(const std::string& name,
                  af.prototype_hash_function(name, provider))
          {
          std::auto_ptr<HashFunction> hash(proto->clone());
-         results = bench_hash(hash.get(), timer, ns_per_provider,
+         results = bench_hash(hash.get(), ns_per_provider,
                               &buf[0], buf.size());
          }
       else if(const MessageAuthenticationCode* proto =
                  af.prototype_mac(name, provider))
          {
          std::auto_ptr<MessageAuthenticationCode> mac(proto->clone());
-         results = bench_mac(mac.get(), timer, ns_per_provider,
+         results = bench_mac(mac.get(), ns_per_provider,
                              &buf[0], buf.size());
          }
 
diff --git a/src/benchmark/benchmark.h b/src/benchmark/benchmark.h
index 1b2730105..9c4e410f1 100644
--- a/src/benchmark/benchmark.h
+++ b/src/benchmark/benchmark.h
@@ -9,40 +9,16 @@
 #define BOTAN_RUNTIME_BENCHMARK_H__
 
 #include <botan/algo_factory.h>
-#include <botan/timer.h>
 #include <botan/rng.h>
 #include <map>
 #include <string>
 
-/**
-* Choose some sort of default timer implementation to use, since some
-* (like hardware tick counters and current Win32 timer) are not
-* reliable for benchmarking.
-*/
-#if defined(BOTAN_HAS_TIMER_POSIX)
-  #include <botan/tm_posix.h>
-#elif defined(BOTAN_HAS_TIMER_UNIX)
-  #include <botan/tm_unix.h>
-#endif
-
 namespace Botan {
 
-#if defined(BOTAN_HAS_TIMER_POSIX)
-  typedef POSIX_Timer Default_Benchmark_Timer;
-#elif defined(BOTAN_HAS_TIMER_UNIX)
-  typedef Unix_Timer Default_Benchmark_Timer;
-#else
-   /* I have not had good success using clock(), the results seem
-    * pretty bogus, but as a last resort it works.
-    */
-  typedef ANSI_Clock_Timer Default_Benchmark_Timer;
-#endif
-
 /**
 * Algorithm benchmark
 * @param name the name of the algorithm to test (cipher, hash, or MAC)
 * @param milliseconds total time for the benchmark to run
-* @param timer the timer to use
 * @param rng the rng to use to generate random inputs
 * @param af the algorithm factory used to create objects
 * @return results a map from provider to speed in mebibytes per second
@@ -50,7 +26,6 @@ namespace Botan {
 std::map<std::string, double>
 BOTAN_DLL algorithm_benchmark(const std::string& name,
                               u32bit milliseconds,
-                              Timer& timer,
                               RandomNumberGenerator& rng,
                               Algorithm_Factory& af);
 
diff --git a/src/benchmark/info.txt b/src/benchmark/info.txt
index f148ae5ce..0210971f7 100644
--- a/src/benchmark/info.txt
+++ b/src/benchmark/info.txt
@@ -15,5 +15,4 @@ hash
 mac
 rng
 stream
-timer
 </requires>
diff --git a/src/build-data/os/aix.txt b/src/build-data/os/aix.txt
index 0063948c7..312377096 100644
--- a/src/build-data/os/aix.txt
+++ b/src/build-data/os/aix.txt
@@ -1,5 +1,9 @@
 os_type unix
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/beos.txt b/src/build-data/os/beos.txt
index b843bd525..f6a06b7af 100644
--- a/src/build-data/os/beos.txt
+++ b/src/build-data/os/beos.txt
@@ -5,6 +5,10 @@ header_dir ../develop/headers
 lib_dir system/lib
 doc_dir documentation
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/cygwin.txt b/src/build-data/os/cygwin.txt
index 7290648c2..f7c1f49ed 100644
--- a/src/build-data/os/cygwin.txt
+++ b/src/build-data/os/cygwin.txt
@@ -3,6 +3,10 @@ os_type unix
 install_root c:\Botan
 doc_dir docs
 
+<target_features>
+gettimeofday
+</target_features>
+
 # Cygwin supports shared libs fine, but there are problems with making a Botan
 # shared library when libraries it depends on are static-only (such as libz).
 # So until I can figure out a work-around, it's disabled.
diff --git a/src/build-data/os/darwin.txt b/src/build-data/os/darwin.txt
index fb18ee191..af60e1bed 100644
--- a/src/build-data/os/darwin.txt
+++ b/src/build-data/os/darwin.txt
@@ -8,6 +8,10 @@ ar_needs_ranlib yes
 
 doc_dir doc
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/dragonfly.txt b/src/build-data/os/dragonfly.txt
index 6823de5b6..7a002a65d 100644
--- a/src/build-data/os/dragonfly.txt
+++ b/src/build-data/os/dragonfly.txt
@@ -1,6 +1,8 @@
 os_type unix
 
 <target_features>
+clock_gettime
+gettimeofday
 posix_mlock
 </target_features>
 
diff --git a/src/build-data/os/freebsd.txt b/src/build-data/os/freebsd.txt
index 6823de5b6..3bcf58d62 100644
--- a/src/build-data/os/freebsd.txt
+++ b/src/build-data/os/freebsd.txt
@@ -2,6 +2,7 @@ os_type unix
 
 <target_features>
 posix_mlock
+gettimeofday
 </target_features>
 
 <supports_shared>
diff --git a/src/build-data/os/hpux.txt b/src/build-data/os/hpux.txt
index 9ff0f7f62..e7aa30e9c 100644
--- a/src/build-data/os/hpux.txt
+++ b/src/build-data/os/hpux.txt
@@ -2,6 +2,10 @@ os_type unix
 
 so_suffix sl
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/irix.txt b/src/build-data/os/irix.txt
index 0063948c7..312377096 100644
--- a/src/build-data/os/irix.txt
+++ b/src/build-data/os/irix.txt
@@ -1,5 +1,9 @@
 os_type unix
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/linux.txt b/src/build-data/os/linux.txt
index 3a92f9dd7..b3c227533 100644
--- a/src/build-data/os/linux.txt
+++ b/src/build-data/os/linux.txt
@@ -1,6 +1,8 @@
 os_type unix
 
 <target_features>
+clock_gettime
+gettimeofday
 posix_mlock
 </target_features>
 
diff --git a/src/build-data/os/netbsd.txt b/src/build-data/os/netbsd.txt
index 0063948c7..312377096 100644
--- a/src/build-data/os/netbsd.txt
+++ b/src/build-data/os/netbsd.txt
@@ -1,5 +1,9 @@
 os_type unix
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/openbsd.txt b/src/build-data/os/openbsd.txt
index 0063948c7..312377096 100644
--- a/src/build-data/os/openbsd.txt
+++ b/src/build-data/os/openbsd.txt
@@ -1,5 +1,9 @@
 os_type unix
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/qnx.txt b/src/build-data/os/qnx.txt
index 0063948c7..312377096 100644
--- a/src/build-data/os/qnx.txt
+++ b/src/build-data/os/qnx.txt
@@ -1,5 +1,9 @@
 os_type unix
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/build-data/os/solaris.txt b/src/build-data/os/solaris.txt
index 47b06dcc4..df951d4fc 100644
--- a/src/build-data/os/solaris.txt
+++ b/src/build-data/os/solaris.txt
@@ -2,6 +2,7 @@ os_type unix
 
 <target_features>
 posix_mlock
+gettimeofday
 </target_features>
 
 <supports_shared>
diff --git a/src/build-data/os/tru64.txt b/src/build-data/os/tru64.txt
index 8fc301d79..677c38955 100644
--- a/src/build-data/os/tru64.txt
+++ b/src/build-data/os/tru64.txt
@@ -1,5 +1,9 @@
 os_type unix
 
+<target_features>
+gettimeofday
+</target_features>
+
 <supports_shared>
 all
 </supports_shared>
diff --git a/src/cert/cvc/asn1_eac_tm.cpp b/src/cert/cvc/asn1_eac_tm.cpp
index 947b9e66d..f361e6098 100644
--- a/src/cert/cvc/asn1_eac_tm.cpp
+++ b/src/cert/cvc/asn1_eac_tm.cpp
@@ -12,7 +12,7 @@
 #include <botan/charset.h>
 #include <botan/parsing.h>
 #include <botan/rounding.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 
 namespace Botan {
 
diff --git a/src/cert/cvc/cvc_self.cpp b/src/cert/cvc/cvc_self.cpp
index 777347a18..227ff4136 100644
--- a/src/cert/cvc/cvc_self.cpp
+++ b/src/cert/cvc/cvc_self.cpp
@@ -14,7 +14,7 @@
 #include <botan/look_pk.h>
 #include <botan/cvc_req.h>
 #include <botan/cvc_ado.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 #include <sstream>
 
 namespace Botan {
diff --git a/src/cert/x509/crl_ent.cpp b/src/cert/x509/crl_ent.cpp
index a8a989c24..42a742ebb 100644
--- a/src/cert/x509/crl_ent.cpp
+++ b/src/cert/x509/crl_ent.cpp
@@ -11,7 +11,7 @@
 #include <botan/ber_dec.h>
 #include <botan/bigint.h>
 #include <botan/oids.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 
 namespace Botan {
 
diff --git a/src/cert/x509/x509_ca.cpp b/src/cert/x509/x509_ca.cpp
index a4159ad2b..16b7b3b9b 100644
--- a/src/cert/x509/x509_ca.cpp
+++ b/src/cert/x509/x509_ca.cpp
@@ -14,7 +14,7 @@
 #include <botan/lookup.h>
 #include <botan/look_pk.h>
 #include <botan/oids.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 #include <algorithm>
 #include <typeinfo>
 #include <iterator>
diff --git a/src/cert/x509/x509opt.cpp b/src/cert/x509/x509opt.cpp
index 03bcd20f4..c6421d9ca 100644
--- a/src/cert/x509/x509opt.cpp
+++ b/src/cert/x509/x509opt.cpp
@@ -8,7 +8,7 @@
 #include <botan/x509self.h>
 #include <botan/oids.h>
 #include <botan/parsing.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 
 namespace Botan {
 
diff --git a/src/cert/x509/x509stor.cpp b/src/cert/x509/x509stor.cpp
index 40801148c..e9e8f4575 100644
--- a/src/cert/x509/x509stor.cpp
+++ b/src/cert/x509/x509stor.cpp
@@ -10,7 +10,7 @@
 #include <botan/pubkey.h>
 #include <botan/look_pk.h>
 #include <botan/oids.h>
-#include <botan/timer.h>
+#include <botan/time.h>
 #include <algorithm>
 #include <memory>
 
diff --git a/src/timer/cpu_counter/tm_hard.cpp b/src/entropy/hres_timer/hres_timer.cpp
index 9e31aee39..74ea801c4 100644
--- a/src/timer/cpu_counter/tm_hard.cpp
+++ b/src/entropy/hres_timer/hres_timer.cpp
@@ -1,25 +1,43 @@
 /*
-* Hardware Timer
-* (C) 1999-2007 Jack Lloyd
+* High Resolution Timestamp Entropy Source
+* (C) 1999-2009 Jack Lloyd
 *
 * Distributed under the terms of the Botan license
 */
 
-#include <botan/tm_hard.h>
+#include <botan/hres_timer.h>
+#include <botan/cpuid.h>
+#include <botan/time.h>
+
+#if defined(BOTAN_TARGET_OS_IS_WINDOWS)
+  #include <windows.h>
+#endif
 
 namespace Botan {
 
 /*
 * Get the timestamp
 */
-u64bit Hardware_Timer::clock() const
+void High_Resolution_Timestamp::poll(Entropy_Accumulator& accum)
    {
+   // If Windows, grab the Performance Counter (usually TSC or PIT)
+#if defined(BOTAN_TARGET_OS_IS_WINDOWS)
+   LARGE_INTEGER tv;
+   ::QueryPerformanceCounter(&tv);
+   accum.add(tv.QuadPart, 0);
+#endif
+
+#if defined(BOTAN_USE_GCC_INLINE_ASM)
+
    u64bit rtc = 0;
 
 #if defined(BOTAN_TARGET_ARCH_IS_IA32) || defined(BOTAN_TARGET_ARCH_IS_AMD64)
-   u32bit rtc_low = 0, rtc_high = 0;
-   asm volatile("rdtsc" : "=d" (rtc_high), "=a" (rtc_low));
-   rtc = (static_cast<u64bit>(rtc_high) << 32) | rtc_low;
+   if(CPUID::has_rdtsc()) // not availble on all x86 CPUs
+      {
+      u32bit rtc_low = 0, rtc_high = 0;
+      asm volatile("rdtsc" : "=d" (rtc_high), "=a" (rtc_low));
+      rtc = (static_cast<u64bit>(rtc_high) << 32) | rtc_low;
+      }
 
 #elif defined(BOTAN_TARGET_ARCH_IS_PPC) || defined(BOTAN_TARGET_ARCH_IS_PPC64)
    u32bit rtc_low = 0, rtc_high = 0;
@@ -41,11 +59,12 @@ u64bit Hardware_Timer::clock() const
 #elif defined(BOTAN_TARGET_ARCH_IS_HPPA)
    asm volatile("mfctl 16,%0" : "=r" (rtc)); // 64-bit only?
 
-#else
-   #error "Unsure how to access hardware timer on this system"
 #endif
 
-   return rtc;
+   // Don't count the timestamp as contributing entropy
+   accum.add(rtc, 0);
+
+#endif
    }
 
 }
diff --git a/src/entropy/hres_timer/hres_timer.h b/src/entropy/hres_timer/hres_timer.h
new file mode 100644
index 000000000..8dfbfc2d7
--- /dev/null
+++ b/src/entropy/hres_timer/hres_timer.h
@@ -0,0 +1,27 @@
+/*
+* High Resolution Timestamp Entropy Source
+* (C) 1999-2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ENTROPY_SRC_HRES_TIMER_H__
+#define BOTAN_ENTROPY_SRC_HRES_TIMER_H__
+
+#include <botan/entropy_src.h>
+
+namespace Botan {
+
+/*
+* High Resolution Timestamp Source
+*/
+class BOTAN_DLL High_Resolution_Timestamp : public EntropySource
+   {
+   public:
+      std::string name() const { return "High Resolution Timestamp"; }
+      void poll(Entropy_Accumulator& accum);
+   };
+
+}
+
+#endif
diff --git a/src/timer/cpu_counter/info.txt b/src/entropy/hres_timer/info.txt
index 2ab1343bc..566ce4ef6 100644
--- a/src/timer/cpu_counter/info.txt
+++ b/src/entropy/hres_timer/info.txt
@@ -1,14 +1,10 @@
-define TIMER_HARDWARE
+define ENTROPY_SRC_HIGH_RESOLUTION_TIMER
 
 load_on asm_ok
 
-<add>
-tm_hard.cpp
-tm_hard.h
-</add>
-
 <cc>
 gcc
+icc
 </cc>
 
 <arch>
@@ -30,7 +26,3 @@ ia64    # ar.itc
 s390x
 hppa
 </arch>
-
-<requires>
-timer
-</requires>
diff --git a/src/rng/auto_rng/auto_rng.cpp b/src/rng/auto_rng/auto_rng.cpp
index f02a9249f..6906d9d17 100644
--- a/src/rng/auto_rng/auto_rng.cpp
+++ b/src/rng/auto_rng/auto_rng.cpp
@@ -7,7 +7,6 @@
 
 #include <botan/auto_rng.h>
 #include <botan/parsing.h>
-#include <botan/timer.h>
 #include <botan/hmac.h>
 #include <botan/sha2_32.h>
 #include <botan/sha2_64.h>
@@ -28,20 +27,8 @@
   #include <botan/aes.h>
 #endif
 
-#if defined(BOTAN_HAS_TIMER_HARDWARE)
-  #include <botan/tm_hard.h>
-#endif
-
-#if defined(BOTAN_HAS_TIMER_POSIX)
-  #include <botan/tm_posix.h>
-#endif
-
-#if defined(BOTAN_HAS_TIMER_UNIX)
-  #include <botan/tm_unix.h>
-#endif
-
-#if defined(BOTAN_HAS_TIMER_WIN32)
-  #include <botan/tm_win32.h>
+#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
+  #include <botan/hres_timer.h>
 #endif
 
 #if defined(BOTAN_HAS_ENTROPY_SRC_DEVICE)
@@ -81,16 +68,8 @@ namespace {
 */
 void add_entropy_sources(RandomNumberGenerator* rng)
    {
-
-   // Add a high resolution timer, if available
-#if defined(BOTAN_HAS_TIMER_HARDWARE)
-   rng->add_entropy_source(new Hardware_Timer);
-#elif defined(BOTAN_HAS_TIMER_POSIX)
-   rng->add_entropy_source(new POSIX_Timer);
-#elif defined(BOTAN_HAS_TIMER_UNIX)
-   rng->add_entropy_source(new Unix_Timer);
-#elif defined(BOTAN_HAS_TIMER_WIN32)
-   rng->add_entropy_source(new Win32_Timer);
+#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
+   rng->add_entropy_source(new High_Resolution_Timestamp);
 #endif
 
 #if defined(BOTAN_HAS_ENTROPY_SRC_DEVICE)
diff --git a/src/rng/auto_rng/info.txt b/src/rng/auto_rng/info.txt
index d5abfc757..357dc17ad 100644
--- a/src/rng/auto_rng/info.txt
+++ b/src/rng/auto_rng/info.txt
@@ -10,5 +10,4 @@ auto_rng.cpp
 <requires>
 hmac
 sha2
-timer
 </requires>
diff --git a/src/rng/randpool/randpool.cpp b/src/rng/randpool/randpool.cpp
index fb51db300..8f9a16edc 100644
--- a/src/rng/randpool/randpool.cpp
+++ b/src/rng/randpool/randpool.cpp
@@ -8,7 +8,6 @@
 #include <botan/randpool.h>
 #include <botan/loadstor.h>
 #include <botan/xor_buf.h>
-#include <botan/timer.h>
 #include <botan/stl_util.h>
 #include <algorithm>
 
@@ -51,12 +50,9 @@ void Randpool::randomize(byte out[], u32bit length)
 */
 void Randpool::update_buffer()
    {
-   const u64bit timestamp = system_time();
-
    for(u32bit i = 0; i != counter.size(); ++i)
       if(++counter[i])
          break;
-   store_be(timestamp, counter + 4);
 
    mac->update(static_cast<byte>(GEN_OUTPUT));
    mac->update(counter, counter.size());
diff --git a/src/timer/cpu_counter/tm_hard.h b/src/timer/cpu_counter/tm_hard.h
deleted file mode 100644
index 2e338eca8..000000000
--- a/src/timer/cpu_counter/tm_hard.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
-* Hardware Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#ifndef BOTAN_TIMER_HARDWARE_H__
-#define BOTAN_TIMER_HARDWARE_H__
-
-#include <botan/timer.h>
-
-namespace Botan {
-
-/*
-* Hardware Timer
-*/
-class BOTAN_DLL Hardware_Timer : public Timer
-   {
-   public:
-      /*
-      @todo: Add sync(Timer& wall_clock, bool milliseconds) which busy
-      loops using wall_clock and tries to guess the tick rate of the
-      hardware counter, allowing it to be used for benchmarks, etc
-      */
-
-      std::string name() const { return "Hardware Timer"; }
-      u64bit clock() const;
-   };
-
-}
-
-#endif
diff --git a/src/timer/gettimeofday/info.txt b/src/timer/gettimeofday/info.txt
deleted file mode 100644
index d1f6f7d74..000000000
--- a/src/timer/gettimeofday/info.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-define TIMER_UNIX
-
-load_on auto
-
-<os>
-aix
-beos
-cygwin
-darwin
-freebsd
-dragonfly
-hpux
-irix
-linux
-netbsd
-openbsd
-qnx
-solaris
-tru64
-</os>
-
-<requires>
-timer
-</requires>
diff --git a/src/timer/gettimeofday/tm_unix.cpp b/src/timer/gettimeofday/tm_unix.cpp
deleted file mode 100644
index 9d8ac4a04..000000000
--- a/src/timer/gettimeofday/tm_unix.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
-* Unix Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#include <botan/tm_unix.h>
-#include <sys/time.h>
-
-namespace Botan {
-
-/*
-* Get the timestamp
-*/
-u64bit Unix_Timer::clock() const
-   {
-   struct ::timeval tv;
-   ::gettimeofday(&tv, 0);
-   return combine_timers(tv.tv_sec, tv.tv_usec, 1000000);
-   }
-
-}
diff --git a/src/timer/gettimeofday/tm_unix.h b/src/timer/gettimeofday/tm_unix.h
deleted file mode 100644
index c304dbb5c..000000000
--- a/src/timer/gettimeofday/tm_unix.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
-* Unix Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#ifndef BOTAN_TIMER_UNIX_H__
-#define BOTAN_TIMER_UNIX_H__
-
-#include <botan/timer.h>
-
-namespace Botan {
-
-/*
-* Unix Timer
-*/
-class BOTAN_DLL Unix_Timer : public Timer
-   {
-   public:
-      std::string name() const { return "Unix gettimeofday"; }
-      u64bit clock() const;
-   };
-
-}
-
-#endif
diff --git a/src/timer/info.txt b/src/timer/info.txt
deleted file mode 100644
index 1dff5ab6f..000000000
--- a/src/timer/info.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-define TIMER
-
-load_on auto
-
-<add>
-timer.cpp
-timer.h
-</add>
-
-<requires>
-rng
-</requires>
diff --git a/src/timer/posix_rt/info.txt b/src/timer/posix_rt/info.txt
deleted file mode 100644
index 4b23a74fc..000000000
--- a/src/timer/posix_rt/info.txt
+++ /dev/null
@@ -1,26 +0,0 @@
-define TIMER_POSIX
-
-load_on auto
-
-<add>
-tm_posix.cpp
-tm_posix.h
-</add>
-
-<libs>
-linux -> rt
-</libs>
-
-# The *BSDs put clock_gettime in sys/time.h, not time.h like POSIX says
-<os>
-cygwin
-linux
-#freebsd
-dragonfly
-#netbsd
-#openbsd
-</os>
-
-<requires>
-timer
-</requires>
diff --git a/src/timer/posix_rt/tm_posix.cpp b/src/timer/posix_rt/tm_posix.cpp
deleted file mode 100644
index 96182025c..000000000
--- a/src/timer/posix_rt/tm_posix.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
-* POSIX Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#include <botan/tm_posix.h>
-
-#ifndef _POSIX_C_SOURCE
-  #define _POSIX_C_SOURCE 199309
-#endif
-
-#include <time.h>
-
-#ifndef CLOCK_REALTIME
-  #define CLOCK_REALTIME 0
-#endif
-
-namespace Botan {
-
-/*
-* Get the timestamp
-*/
-u64bit POSIX_Timer::clock() const
-   {
-   struct ::timespec tv;
-   ::clock_gettime(CLOCK_REALTIME, &tv);
-   return combine_timers(tv.tv_sec, tv.tv_nsec, 1000000000);
-   }
-
-}
diff --git a/src/timer/posix_rt/tm_posix.h b/src/timer/posix_rt/tm_posix.h
deleted file mode 100644
index 8bedccfa2..000000000
--- a/src/timer/posix_rt/tm_posix.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
-* POSIX Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#ifndef BOTAN_TIMER_POSIX_H__
-#define BOTAN_TIMER_POSIX_H__
-
-#include <botan/timer.h>
-
-namespace Botan {
-
-/*
-* POSIX Timer
-*/
-class BOTAN_DLL POSIX_Timer : public Timer
-   {
-   public:
-      std::string name() const { return "POSIX clock_gettime"; }
-      u64bit clock() const;
-   };
-
-}
-
-#endif
diff --git a/src/timer/timer.h b/src/timer/timer.h
deleted file mode 100644
index 603027f6d..000000000
--- a/src/timer/timer.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/**
-* Timestamp Functions
-* (C) 1999-2009 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#ifndef BOTAN_TIMERS_H__
-#define BOTAN_TIMERS_H__
-
-#include <botan/rng.h>
-#include <ctime>
-
-namespace Botan {
-
-/*
-* Time Access/Conversion Functions
-*/
-BOTAN_DLL u64bit system_time();
-
-BOTAN_DLL std::tm time_t_to_tm(u64bit);
-
-/**
-* Timer Interface
-*/
-class BOTAN_DLL Timer : public EntropySource
-   {
-   public:
-      /**
-      @return nanoseconds resolution timestamp, unknown epoch
-      */
-      virtual u64bit clock() const = 0;
-
-      void poll(Entropy_Accumulator& accum);
-
-      virtual ~Timer() {}
-   protected:
-      static u64bit combine_timers(u32bit, u32bit, u32bit);
-   };
-
-/**
-* ANSI Clock Timer
-*/
-class BOTAN_DLL ANSI_Clock_Timer : public Timer
-   {
-   public:
-      std::string name() const { return "ANSI clock"; }
-      u64bit clock() const;
-   };
-
-}
-
-#endif
diff --git a/src/timer/win32_query_perf_ctr/info.txt b/src/timer/win32_query_perf_ctr/info.txt
deleted file mode 100644
index 67db5bc95..000000000
--- a/src/timer/win32_query_perf_ctr/info.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-define TIMER_WIN32
-
-load_on auto
-
-<os>
-cygwin
-windows
-mingw
-</os>
-
-<libs>
-windows -> user32.lib
-</libs>
-
-<requires>
-timer
-</requires>
diff --git a/src/timer/win32_query_perf_ctr/tm_win32.cpp b/src/timer/win32_query_perf_ctr/tm_win32.cpp
deleted file mode 100644
index 6b878e6e2..000000000
--- a/src/timer/win32_query_perf_ctr/tm_win32.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
-* Win32 Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#include <botan/tm_win32.h>
-#include <windows.h>
-
-namespace Botan {
-
-/*
-* Get the timestamp
-*/
-u64bit Win32_Timer::clock() const
-   {
-   LARGE_INTEGER tv;
-   ::QueryPerformanceCounter(&tv);
-   return tv.QuadPart;
-   }
-
-}
diff --git a/src/timer/win32_query_perf_ctr/tm_win32.h b/src/timer/win32_query_perf_ctr/tm_win32.h
deleted file mode 100644
index 5bcb720ab..000000000
--- a/src/timer/win32_query_perf_ctr/tm_win32.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
-* Win32 Timer
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#ifndef BOTAN_TIMER_WIN32_H__
-#define BOTAN_TIMER_WIN32_H__
-
-#include <botan/timer.h>
-
-namespace Botan {
-
-/*
-* Win32 Timer
-*/
-class BOTAN_DLL Win32_Timer : public Timer
-   {
-   public:
-      std::string name() const { return "Win32 QueryPerformanceCounter"; }
-      u64bit clock() const;
-   };
-
-}
-
-#endif
diff --git a/src/utils/info.txt b/src/utils/info.txt
index 3d024fa09..110afeb64 100644
--- a/src/utils/info.txt
+++ b/src/utils/info.txt
@@ -3,5 +3,5 @@ define UTIL_FUNCTIONS
 load_on always
 
 <libs>
-tru64 -> rt
+linux,tru64 -> rt
 </libs>
diff --git a/src/timer/timer.cpp b/src/utils/time.cpp
index 16d7dc368..856b1c7be 100644
--- a/src/timer/timer.cpp
+++ b/src/utils/time.cpp
@@ -1,16 +1,50 @@
 /**
-* Timestamp Functions
+* Time Functions
 * (C) 1999-2009 Jack Lloyd
 *
 * Distributed under the terms of the Botan license
 */
 
-#include <botan/timer.h>
-#include <botan/loadstor.h>
+#include <botan/time.h>
+#include <botan/exceptn.h>
 #include <ctime>
 
+#if defined(BOTAN_TARGET_OS_HAS_GETTIMEOFDAY)
+  #include <sys/time.h>
+#endif
+
+#if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME)
+
+#ifndef _POSIX_C_SOURCE
+  #define _POSIX_C_SOURCE 199309
+#endif
+
+#include <time.h>
+
+#ifndef CLOCK_REALTIME
+  #define CLOCK_REALTIME 0
+#endif
+
+#endif
+
 namespace Botan {
 
+namespace {
+
+/**
+* Combine a two time values into a single one
+*/
+u64bit combine_timers(u32bit seconds, u32bit parts, u32bit parts_hz)
+   {
+   static const u64bit NANOSECONDS_UNITS = 1000000000;
+
+   u64bit res = seconds * NANOSECONDS_UNITS;
+   res += parts * (NANOSECONDS_UNITS / parts_hz);
+   return res;
+   }
+
+}
+
 /**
 * Get the system clock
 */
@@ -32,33 +66,22 @@ std::tm time_t_to_tm(u64bit timer)
    return (*tm_p);
    }
 
-/**
-* Read the clock and return the output
-*/
-void Timer::poll(Entropy_Accumulator& accum)
-   {
-   const u64bit clock_value = this->clock();
-   accum.add(clock_value, 0);
-   }
-
-/**
-* Combine a two time values into a single one
-*/
-u64bit Timer::combine_timers(u32bit seconds, u32bit parts, u32bit parts_hz)
+u64bit get_nanoseconds_clock()
    {
-   static const u64bit NANOSECONDS_UNITS = 1000000000;
+#if defined(BOTAN_TARGET_OS_HAS_CLOCK_GETTIME)
+   struct ::timespec tv;
+   ::clock_gettime(CLOCK_REALTIME, &tv);
+   return combine_timers(tv.tv_sec, tv.tv_nsec, 1000000000);
 
-   u64bit res = seconds * NANOSECONDS_UNITS;
-   res += parts * (NANOSECONDS_UNITS / parts_hz);
-   return res;
-   }
+#elif defined(BOTAN_TARGET_OS_HAS_GETTIMEOFDAY)
+   struct ::timeval tv;
+   ::gettimeofday(&tv, 0);
+   return combine_timers(tv.tv_sec, tv.tv_usec, 1000000);
 
-/**
-* ANSI Clock
-*/
-u64bit ANSI_Clock_Timer::clock() const
-   {
+#else
    return combine_timers(std::time(0), std::clock(), CLOCKS_PER_SEC);
+
+#endif
    }
 
 }
diff --git a/src/utils/time.h b/src/utils/time.h
new file mode 100644
index 000000000..c7f459096
--- /dev/null
+++ b/src/utils/time.h
@@ -0,0 +1,30 @@
+/**
+* Time Functions
+* (C) 1999-2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_TIME_H__
+#define BOTAN_TIME_H__
+
+#include <botan/types.h>
+#include <ctime>
+
+namespace Botan {
+
+/*
+* Time Access/Conversion Functions
+*/
+BOTAN_DLL u64bit system_time();
+
+BOTAN_DLL std::tm time_t_to_tm(u64bit);
+
+/**
+@return nanoseconds resolution timestamp, unknown epoch
+*/
+BOTAN_DLL u64bit get_nanoseconds_clock();
+
+}
+
+#endif