Add SHA256 dispatcher

2 files changed, 17 insertions, 2 deletions

diff --git a/src/crypto/sha256.cpp b/src/crypto/sha256.cpp
index 45ee93d471..3649dc4be0 100644
--- a/src/crypto/sha256.cpp
+++ b/src/crypto/sha256.cpp
@@ -8,6 +8,8 @@
 
 #include <string.h>
 
+#include <atomic>
+
 // Internal implementation code.
 namespace
 {
@@ -131,8 +133,15 @@ void Transform(uint32_t* s, const unsigned char* chunk, size_t blocks)
 }
 
 } // namespace sha256
+
+void (*Transform)(uint32_t*, const unsigned char*, size_t) = sha256::Transform;
+
 } // namespace
 
+std::string SHA256AutoDetect()
+{
+    return "standard";
+}
 
 ////// SHA-256
 
@@ -150,12 +159,12 @@ CSHA256& CSHA256::Write(const unsigned char* data, size_t len)
         memcpy(buf + bufsize, data, 64 - bufsize);
         bytes += 64 - bufsize;
         data += 64 - bufsize;
-        sha256::Transform(s, buf, 1);
+        Transform(s, buf, 1);
         bufsize = 0;
     }
     if (end - data >= 64) {
         size_t blocks = (end - data) / 64;
-        sha256::Transform(s, data, blocks);
+        Transform(s, data, blocks);
         data += 64 * blocks;
         bytes += 64 * blocks;
     }
diff --git a/src/crypto/sha256.h b/src/crypto/sha256.h
index 127e62a228..aa4f3972cc 100644
--- a/src/crypto/sha256.h
+++ b/src/crypto/sha256.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 #include <stdlib.h>
+#include <string>
 
 /** A hasher class for SHA-256. */
 class CSHA256
@@ -25,4 +26,9 @@ public:
     CSHA256& Reset();
 };
 
+/** Autodetect the best available SHA256 implementation.
+ *  Returns the name of the implementation.
+ */
+std::string SHA256AutoDetect();
+
 #endif // BITCOIN_CRYPTO_SHA256_H