1 files changed, 24 insertions, 0 deletions
diff --git a/src/post.cc b/src/post.cc
index e2063a36..9d799a9e 100644
--- a/src/post.cc
+++ b/src/post.cc
@@ -671,6 +671,30 @@ void post_t::set_reported_account(account_t * acct)
   acct->xdata().reported_posts.push_back(this);
 }
 
+extern "C" unsigned char *SHA512(
+  void *data, unsigned int data_len, unsigned char *digest);
+
+namespace {
+  std::string bufferToHex(const unsigned char* buffer, std::size_t size) {
+      std::ostringstream oss;
+      oss << std::hex << std::setfill('0');
+      for(std::size_t i = 0; i < size; ++i)
+          oss << std::setw(2) << static_cast<int>(buffer[i]);
+      return oss.str();
+  }
+}
+
+string post_t::hash(string nonce) const {
+  unsigned char data[128];
+  std::ostringstream repr;
+  repr << nonce;
+  repr << account->fullname();
+  repr << amount.to_string();
+  string repr_str(repr.str());
+  SHA512((void *)repr_str.c_str(), repr_str.length(), data);
+  return bufferToHex(data, 64 /*SHA512_DIGEST_LENGTH*/);
+}
+
 void extend_post(post_t& post, journal_t& journal)
 {
   commodity_t& comm(post.amount.commodity());