commit 9dd9adc1e0c640ea4022a7eb6bd0a8e8bf05154e
author Zhenkai Zhu <zhenkai@cs.ucla.edu> Wed Mar 13 16:12:09 2013 -0700
committer Alexander Afanasyev <alexander.afanasyev@ucla.edu> Thu Aug 15 13:29:56 2013 -0700
tree 7a7c98a29a9d37c4c644d873221af88097757375
parent dd1f14d44bf8917279d1a0193d3ef9d73a4a7af0

ccnx: Rename Key to Cert; fix bug with the usage of Hash

Change-Id: Ic7656e6d8d46729d663ccfa5412e78443aff76bc

src/hash-helper.cc

diff --git a/src/hash-helper.cc b/src/hash-helper.cc
index 6fe0ca9..11b29e2 100644
--- a/src/hash-helper.cc
+++ b/src/hash-helper.cc
@@ -167,3 +167,25 @@
 
   return retval;
 }
+
+HashPtr
+Hash::FromBytes (const Ccnx::Bytes &bytes)
+{
+  HashPtr retval = make_shared<Hash> (reinterpret_cast<void*> (0), 0);
+  retval->m_buf = new unsigned char [EVP_MAX_MD_SIZE];
+
+  EVP_MD_CTX *hash_context = EVP_MD_CTX_create ();
+  EVP_DigestInit_ex (hash_context, HASH_FUNCTION (), 0);
+
+  // not sure whether it's bad to do so if bytes.size is huge
+  EVP_DigestUpdate(hash_context, Ccnx::head(bytes), bytes.size());
+
+  retval->m_buf = new unsigned char [EVP_MAX_MD_SIZE];
+
+  EVP_DigestFinal_ex (hash_context,
+                      retval->m_buf, &retval->m_length);
+
+  EVP_MD_CTX_destroy (hash_context);
+
+  return retval;
+}