Add convenient functions to compute hashes of byte vectors.

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

Differential Revision: https://reviews.llvm.org/D26988

llvm-svn: 287726

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/Support/SHA1.cpp b/llvm/lib/Support/SHA1.cpp
index 88c76395ead..016f580ae6d 100644
--- a/llvm/lib/Support/SHA1.cpp
+++ b/llvm/lib/Support/SHA1.cpp
@@ -269,3 +269,13 @@ StringRef SHA1::result() {
   // Return pointer to hash (20 characters)
   return Hash;
 }
+
+std::array<uint8_t, 20> SHA1::hash(ArrayRef<uint8_t> Data) {
+  SHA1 Hash;
+  Hash.update(Data);
+  StringRef S = Hash.final().data();
+
+  std::array<uint8_t, 20> Arr;
+  memcpy(Arr.data(), S.data(), S.size());
+  return Arr;
+}