Static ring::signature::RSA_PKCS1_SHA512

pub static RSA_PKCS1_SHA512: PKCS1 = PKCS1{digest_alg: &digest::SHA512,
      digestinfo_prefix: &SHA512_PKCS1_DIGESTINFO_PREFIX,}

PKCS#1 1.5 padding using SHA-512 for RSA signatures. Feature: rsa_signing.