RFR: 8023980: JCE doesn't provide any class to handle RSA private key in PKCS#1

[Valerie Peng]

Can someone help review this?

This change enhances RSA KeyFactory impl of SunRsaSign and SunPKCS11 providers to accept RSA keys in PKCS#1 format and encoding and translate them to provider-specific RSA keys. Updated the relevant tests with a sample PKCS#1 encoded key pair.

Thanks,
Valerie

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Commit messages:
 - 8023980: JCE doesn't provide any class to handle RSA private key in PKCS #1

Changes: https://git.openjdk.java.net/jdk/pull/1787/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1787&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8023980
  Stats: 458 lines in 6 files changed: 302 ins; 55 del; 101 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1787.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1787/head:pull/1787

PR: https://git.openjdk.java.net/jdk/pull/1787