I use following script to decode a Base64 coded binary content and put it into a string then write to file.
byte[] decoded = slurper.signatureValue.decodeBase64();
String sigValue = new String(decoded)
def path = context.expand('${Properties#outDir}') + context.expand('${Properties#fileName}')
def myFile = new File(path)
myFile.write(sigValue)
When I use Notepad++
with MIME tools plugin to decode it and save it, output is different and not sure, what is difference caused by.
The following code produces valid(same as Notepad++ plugin) value:
byte[] decoded = Base64.getDecoder().decode(slurper.signatureValue);
myFile.bytes = decoded