Patch: Add MD5 and SHA1 sign/verify functions

[Will]

Hello,

Here is a patch which adds RSA sign and verify functions to the crypto
application.  The existing crypto:rsa_verify/3 function only supports
SHA1 digests.

This patch adds the following new functions:

     crypto:rsa_md5_verify/3
     crypto:rsa_sha_verify/3
     crypto:rsa_md5_sign/2
     crypto:rsa_sha_sign/2

Please let me know if any improvements are needed; I attempted to
follow the general spirit of the existing crypto code.  If possible
I'd like to see this added to OTP as it seems like very useful
functionality.

Thanks,
Will

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