I was surprised that GWT supports MessageDigest as its not part of the JRE 
Emulation documentation 
(https://developers.google.com/web-toolkit/doc/latest/RefJreEmulation) . 
Seems like its slightly out of date.

Nevertheless when you take a look at the source code you can see that GWT 
only supports MD5 for 
MessageDigest: 
https://code.google.com/p/google-web-toolkit/source/browse/releases/2.5/user/super/com/google/gwt/emul/java/security/MessageDigest.java

Note that the linked implementation is the super source version that is 
used by the GWT compiler when it generates the JS code for your app. During 
DevMode you are using the standard Java MessageDigest which also supports 
SHA. Thats why you see the difference.


-- J.

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