RFR: 8293858: Change PKCS7 code to use default SecureRandom impl instead of SHA1PRNG

[Weijun Wang]

On Thu, 27 Oct 2022 14:21:19 GMT, Sean Mullan <mullan at openjdk.org> wrote:

> For timestamp nonces, change the PKCS7 code to use the default SecureRandom PRNG (which varies depending on the OS), instead of SHA1PRNG.

Marked as reviewed by weijun (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10883