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Task/SHA-256/NetRexx/sha-256.netrexx

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+/* NetRexx */
+options replace format comments java crossref savelog symbols binary
+
+import java.security.MessageDigest
+
+SHA256('Rosetta code', '764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf')
+
+return
+
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+method SHA256(messageText, verifyCheck) public static
+
+  algorithm   = 'SHA-256'
+  digestSum = getDigest(messageText, algorithm)
+
+  say '<Message>'messageText'</Message>'
+  say Rexx('<'algorithm'>').right(12) || digestSum'</'algorithm'>'
+  say Rexx('<Verify>').right(12) || verifyCheck'</Verify>'
+  if digestSum == verifyCheck then say algorithm 'Confirmed'
+                              else say algorithm 'Failed'
+
+  return
+
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+method getDigest(messageText = Rexx, algorithm = Rexx 'MD5', encoding = Rexx 'UTF-8', lowercase = boolean 1) public static returns Rexx
+
+  algorithm = algorithm.upper
+  encoding  = encoding.upper
+
+  message      = String(messageText)
+  messageBytes = byte[]
+  digestBytes  = byte[]
+  digestSum    = Rexx ''
+
+  do
+    messageBytes = message.getBytes(encoding)
+    md = MessageDigest.getInstance(algorithm)
+    md.update(messageBytes)
+    digestBytes = md.digest
+
+    loop b_ = 0 to digestBytes.length - 1
+      bb = Rexx(digestBytes[b_]).d2x(2)
+      if lowercase then digestSum = digestSum || bb.lower
+                   else digestSum = digestSum || bb.upper
+      end b_
+  catch ex = Exception
+    ex.printStackTrace
+  end
+
+  return digestSum