Additional CRYPT notes

• This is in glibc2
• If the salt starts with a $, then an ID is present.
  • 1, MD5, 22 character encrypted output
  • 2a, Blowfish (not in mainline glibc; added in some Linux distributions)
  • 5, SHA-256 (since glibc 2.7), 43 character output
  • 6, SHA-512 (since glibc 2.7), 86 character output