From c1d9742df3cf20c3b235ecdd4f4d7a6f71037f1d Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Wed, 20 Apr 2016 13:25:18 +0300
Subject: Add sha256_to_fingerprint (), fingerprint_to_sha256 ()

---
 butl/sha256 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'butl/sha256')

diff --git a/butl/sha256 b/butl/sha256
index d583701..a1d0c38 100644
--- a/butl/sha256
+++ b/butl/sha256
@@ -79,6 +79,21 @@ namespace butl
     mutable digest_type bin_;
     mutable bool done_;
   };
+
+  // Convert a SHA256 string representation (64 hex digits) to the fingerprint
+  // canonical representation (32 colon-separated upper case hex digit pairs,
+  // like 01:AB:CD:...). Throw invalid_argument if the argument is not a valid
+  // SHA256 string.
+  //
+  std::string
+  sha256_to_fingerprint (const std::string&);
+
+  // Convert a fingerprint (32 colon-separated hex digit pairs) to the SHA256
+  // string representation (64 lower case hex digits). Throw invalid_argument
+  // if the argument is not a valid fingerprint.
+  //
+  std::string
+  fingerprint_to_sha256 (const std::string&);
 };
 
 #endif // BUTL_SHA256
-- 
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