[PATCH] D26988: Add convenient functions to compute hashes of byte vectors.

[Rui Ueyama via llvm-commits]

ruiu created this revision.
ruiu added a reviewer: mehdi_amini.
ruiu added a subscriber: llvm-commits.

In many sitautions, you just want to compute a hash for one chunk
of data. This patch adds convenient functions for that purpose.


https://reviews.llvm.org/D26988

Files:
  include/llvm/Support/MD5.h
  include/llvm/Support/SHA1.h
  lib/Support/MD5.cpp
  lib/Support/SHA1.cpp


Index: lib/Support/SHA1.cpp
===================================================================
--- lib/Support/SHA1.cpp
+++ lib/Support/SHA1.cpp
@@ -269,3 +269,11 @@
   // Return pointer to hash (20 characters)
   return Hash;
 }
+
+std::vector<uint8_t> SHA1::hash(ArrayRef<uint8_t> Data) {
+  SHA1 Hash;
+  Hash.update(Data);
+  StringRef S = Hash.final().data();
+  auto *P = reinterpret_cast<const uint8_t *>(S.data());
+  return {P, P + S.size()};
+}
Index: lib/Support/MD5.cpp
===================================================================
--- lib/Support/MD5.cpp
+++ lib/Support/MD5.cpp
@@ -283,4 +283,12 @@
     Res << format("%.2x", Result[i]);
 }
 
+std::vector<uint8_t> MD5::hash(ArrayRef<uint8_t> Data) {
+  MD5 Hash;
+  Hash.update(Data);
+  MD5::MD5Result Res;
+  Hash.final(Res);
+  return {Res, Res + sizeof(Res)};
+}
+
 }
Index: include/llvm/Support/SHA1.h
===================================================================
--- include/llvm/Support/SHA1.h
+++ include/llvm/Support/SHA1.h
@@ -53,6 +53,9 @@
   /// made into update.
   StringRef result();
 
+  /// Returns a raw 160-bit SHA1 hash for the given data.
+  static std::vector<uint8_t> hash(ArrayRef<uint8_t> Data);
+
 private:
   /// Define some constants.
   /// "static constexpr" would be cleaner but MSVC does not support it yet.
Index: include/llvm/Support/MD5.h
===================================================================
--- include/llvm/Support/MD5.h
+++ include/llvm/Support/MD5.h
@@ -62,6 +62,9 @@
   /// deposited into \p Str. The result will be of length 32.
   static void stringifyResult(MD5Result &Result, SmallString<32> &Str);
 
+  /// \brief Computes the hash for a given bytes.
+  static std::vector<uint8_t> hash(ArrayRef<uint8_t> Data);
+
 private:
   const uint8_t *body(ArrayRef<uint8_t> Data);
 };


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