1 files changed, 20 insertions, 0 deletions
diff --git a/src/sbearssl/sbearssl_choose_hash.c b/src/sbearssl/sbearssl_choose_hash.c
new file mode 100644
index 0000000..1228081
--- /dev/null
+++ b/src/sbearssl/sbearssl_choose_hash.c
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#include <bearssl.h>
+
+#include "sbearssl-internal.h"
+
+unsigned int sbearssl_choose_hash (unsigned int bf)
+{
+  static unsigned char const pref[5] =
+  {
+    br_sha256_ID,
+    br_sha384_ID,
+    br_sha512_ID,
+    br_sha224_ID,
+    br_sha1_ID
+  } ;
+  for (unsigned int i = 0 ; i < 5 ; i++)
+    if ((bf >> pref[i]) & 1) return pref[i] ;
+  return 0 ;
+}