> +         
> canonicalizedHeadersBuffer.append(key.toLowerCase()).append(':').append(header.getValue()).append('\n');
> +      }
> +      return canonicalizedHeadersBuffer.toString();
> +   }
> +
> +   private String buildSignedHeaders(Multimap<String, String> 
> canonicalizedHeadersMap) {
> +      return 
> Joiner.on(';').join(Iterables.transform(canonicalizedHeadersMap.keySet(), new 
> Function<String, String>() {
> +
> +         @Override
> +         public String apply(String input) {
> +            return input.toLowerCase();
> +         }
> +      }));
> +   }
> +
> +   private String sha256(byte[] unhashedBytes) {

Make method static.

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