4 files changed, 30 insertions, 2 deletions
diff --git a/src/crypto/crypto.cpp b/src/crypto/crypto.cpp
index 3f06c4f3f..6d3c4ed35 100644
--- a/src/crypto/crypto.cpp
+++ b/src/crypto/crypto.cpp
@@ -88,13 +88,24 @@ namespace crypto {
     return &reinterpret_cast<const unsigned char &>(scalar);
   }
 
-  void generate_random_bytes_thread_safe(size_t N, uint8_t *bytes)
+  boost::mutex &get_random_lock()
   {
     static boost::mutex random_lock;
-    boost::lock_guard<boost::mutex> lock(random_lock);
+    return random_lock;
+  }
+
+  void generate_random_bytes_thread_safe(size_t N, uint8_t *bytes)
+  {
+    boost::lock_guard<boost::mutex> lock(get_random_lock());
     generate_random_bytes_not_thread_safe(N, bytes);
   }
 
+  void add_extra_entropy_thread_safe(const void *ptr, size_t bytes)
+  {
+    boost::lock_guard<boost::mutex> lock(get_random_lock());
+    add_extra_entropy_not_thread_safe(ptr, bytes);
+  }
+
   static inline bool less32(const unsigned char *k0, const unsigned char *k1)
   {
     for (int n = 31; n >= 0; --n)
diff --git a/src/crypto/crypto.h b/src/crypto/crypto.h
index bac456f60..8ce321f71 100644
--- a/src/crypto/crypto.h
+++ b/src/crypto/crypto.h
@@ -147,6 +147,7 @@ namespace crypto {
   };
 
   void generate_random_bytes_thread_safe(size_t N, uint8_t *bytes);
+  void add_extra_entropy_thread_safe(const void *ptr, size_t bytes);
 
   /* Generate N random bytes
    */
diff --git a/src/crypto/random.c b/src/crypto/random.c
index 74b202661..766b5f558 100644
--- a/src/crypto/random.c
+++ b/src/crypto/random.c
@@ -146,3 +146,18 @@ void generate_random_bytes_not_thread_safe(size_t n, void *result) {
     }
   }
 }
+
+void add_extra_entropy_not_thread_safe(const void *ptr, size_t bytes)
+{
+  size_t i;
+
+  while (bytes > 0)
+  {
+    hash_permutation(&state);
+    const size_t round_bytes = bytes > HASH_DATA_AREA ? HASH_DATA_AREA : bytes;
+    for (i = 0; i < round_bytes; ++i)
+      state.b[i] ^= ((const uint8_t*)ptr)[i];
+    bytes -= round_bytes;
+    ptr = cpadd(ptr, round_bytes);
+  }
+}
diff --git a/src/crypto/random.h b/src/crypto/random.h
index ccb9f4853..21a66d776 100644
--- a/src/crypto/random.h
+++ b/src/crypto/random.h
@@ -33,3 +33,4 @@
 #include <stddef.h>
 
 void generate_random_bytes_not_thread_safe(size_t n, void *result);
+void add_extra_entropy_not_thread_safe(const void *ptr, size_t bytes);