core: protect precomputed block hashes with SHA256

2 files changed, 13 insertions, 0 deletions

diff --git a/src/common/util.cpp b/src/common/util.cpp
index cc2b5b8ff..046961b06 100644
--- a/src/common/util.cpp
+++ b/src/common/util.cpp
@@ -587,6 +587,18 @@ std::string get_nix_version_display_string()
     return 0;
   }
 
+  bool sha256sum(const uint8_t *data, size_t len, crypto::hash &hash)
+  {
+    SHA256_CTX ctx;
+    if (!SHA256_Init(&ctx))
+      return false;
+    if (!SHA256_Update(&ctx, data, len))
+      return false;
+    if (!SHA256_Final((unsigned char*)hash.data, &ctx))
+      return false;
+    return true;
+  }
+
   bool sha256sum(const std::string &filename, crypto::hash &hash)
   {
     if (!epee::file_io_utils::is_file_exist(filename))
diff --git a/src/common/util.h b/src/common/util.h
index 1d4b3a153..4291d7e18 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -185,5 +185,6 @@ namespace tools
   bool is_local_address(const std::string &address);
   int vercmp(const char *v0, const char *v1); // returns < 0, 0, > 0, similar to strcmp, but more human friendly than lexical - does not attempt to validate
 
+  bool sha256sum(const uint8_t *data, size_t len, crypto::hash &hash);
   bool sha256sum(const std::string &filename, crypto::hash &hash);
 }