password.

chage (1)            - change user password expiry information
chpasswd (8)         - update password file in batch
crypt (3)            - password and data encryption
des_read_2passwords (3ssl) - Compatibility user interface functions
endpwent (3)         - get password file entry
endspent (3)         - get shadow password file entry
EVP_BytesToKey (3ssl) - password based encryption routine
expiry (1)           - check and enforce password expiration policy
fgetpwent (3)        - get password file entry
fgetspent (3)        - get shadow password file entry
fgetspent_r (3)      - get shadow password file entry
getpw (3)            - Re-construct password line entry
getpwent (3)         - get password file entry
getpwnam (3)         - get password file entry
getpwnam_r (3)       - get password file entry
getpwuid (3)         - get password file entry
getpwuid_r (3)       - get password file entry
getspent (3)         - get shadow password file entry
getspent_r (3)       - get shadow password file entry
getspnam (3)         - get shadow password file entry
getspnam_r (3)       - get shadow password file entry
grpconv (8)          - convert to and from shadow passwords and groups.
grpunconv (8)        - convert to and from shadow passwords and groups.
grub-md5-crypt (8)   - Encrypt a password in MD5 format
lckpwdf (3)          - get shadow password file entry
login.defs (5)       - shadow password suite configuration
lppasswd (1)         - add, change, or delete digest passwords.
mysql_setpermission (1) - Adds MySQL users or changes passwords.
passwd (1ssl)        - compute password hashes
passwd (5)           - The password file
passwd2des (3)       - RFS password encryption
putpwent (3)         - write a password file entry
putspent (3)         - get shadow password file entry
pwck (8)             - verify integrity of password files
pwconv (8)           - convert to and from shadow passwords and groups.
pwunconv (8)         - convert to and from shadow passwords and groups.
setpwent (3)         - get password file entry
setspent (3)         - get shadow password file entry
sgetspent (3)        - get shadow password file entry
sgetspent_r (3)      - get shadow password file entry
shadow (5)           - encrypted password file
shadowconfig (8)     - toggle shadow passwords on and off
ulckpwdf (3)         - get shadow password file entry
unix_chkpwd (8)      - check the password of the invoking user
vigr (8)             - edit the password, group, shadow-password, or shadow-group file.
vipw (8)             - edit the password, group, shadow-password, or shadow-group file.
xcrypt (3)           - RFS password encryption
xdecrypt (3)         - RFS password encryption
xencrypt (3)         - RFS password encryption