A.2. libcrypt

The behavior of the interfaces in this library is specified by the following Standards.

This Specification [LSB]
POSIX 1003.1-2008 (ISO/IEC 9945-2009) [SUSv4]

Table A-3. libcrypt Function Interfaces

crypt[SUSv4]encrypt[SUSv4]setkey[SUSv4]
crypt_r[LSB]encrypt_r[LSB]setkey_r[LSB]