Using the SHA-512 digest algorithm to digest the entries in a jar
file results in a jar file that cannot be validated with the jarsigner
tool. There is a line wrapping problem in the digested jar file that results
in the base64 encoded digests (which are longer with the SHA-512 alg) being
chopped and wrapped into the following line. The jarsigner tool gives
the following error when verifying the signed jar file:

jarsigner: java.io.IOException: invalid header field
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