8175110: Higher quality ECDSA operations
Reviewed-by: jnimeh, valeriep, vinnie, xuelei

8168714: Tighten ECDSA validation
Summary: Added additional checks to DER parsing code
Reviewed-by: vinnie, ahgross

8161571: Verifying ECDSA signatures permits trailing bytes
Reviewed-by: xuelei

8042967: Add variant of DSA Signature algorithms that do not ASN.1 encode the signature bytes
Reviewed-by: mullan

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com