[BUGS] about pgcrypto, not support "des"

hello,everybody:

psql.bin (9.5.9)

Type "help" for help.

dafc=> \dx pgcrypto 

             List of installed extensions

   Name   | Version | Schema |       Description       

----------+---------+--------+-------------------------

 pgcrypto | 1.2     | public | cryptographic functions

(1 row)

dafc=> select digest('test','des');

uname -a

Linux ic-test.hadoop 2.6.32-131.0.15.el6.x86_64 #1 SMP Tue May 10 15:42:40 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux

openssl version

OpenSSL 1.1.0e  16 Feb 2017

pg_config 

BINDIR = /opt/PostgreSQL/9.5/bin

DOCDIR = /opt/PostgreSQL/9.5/doc/postgresql

HTMLDIR = /opt/PostgreSQL/9.5/doc/postgresql

INCLUDEDIR = /opt/PostgreSQL/9.5/include

PKGINCLUDEDIR = /opt/PostgreSQL/9.5/include/postgresql

INCLUDEDIR-SERVER = /opt/PostgreSQL/9.5/include/postgresql/server

LIBDIR = /opt/PostgreSQL/9.5/lib

PKGLIBDIR = /opt/PostgreSQL/9.5/lib/postgresql

LOCALEDIR = /opt/PostgreSQL/9.5/share/locale

MANDIR = /opt/PostgreSQL/9.5/share/man

SHAREDIR = /opt/PostgreSQL/9.5/share/postgresql

SYSCONFDIR = /opt/PostgreSQL/9.5/etc/postgresql

PGXS = /opt/PostgreSQL/9.5/lib/postgresql/pgxs/src/makefiles/pgxs.mk

CONFIGURE = '--enable-debug' '--with-libs=/opt/local/Current/lib' '--with-includes=/opt/local/Current/include/libxml2:/opt/local/Current/include' '--prefix=/mnt/hgfs/pginstaller.auto/server/staging/linux-x64.build' '--with-ldap' '--with-openssl' '--with-perl' '--with-python' '--with-tcl' '--with-tclconfig=/opt/local/EnterpriseDB/LanguagePack/9.5/Tcl-8.5/lib' '--with-pam' '--enable-thread-safety' '--with-libxml' '--with-ossp-uuid' '--docdir=/mnt/hgfs/pginstaller.auto/server/staging/linux-x64.build/doc/postgresql' '--with-libxslt' '--with-libedit-preferred' '--with-gssapi' 'LD_LIBRARY_PATH=/opt/local/Current/lib' 'CFLAGS=-O2 -DMAP_HUGETLB=0x40000'

CC = gcc

CPPFLAGS = -D_GNU_SOURCE -I/opt/local/Current/include/libxml2 -I/opt/local/Current/include

CFLAGS = -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -g -O2 -DMAP_HUGETLB=0x40000

CFLAGS_SL = -fPIC

LDFLAGS = -L../../../src/common -L/opt/local/Current/lib -Wl,--as-needed -Wl,-rpath,'/mnt/hgfs/pginstaller.auto/server/staging/linux-x64.build/lib',--enable-new-dtags

LDFLAGS_EX = 

LDFLAGS_SL = 

LIBS = -lpgcommon -lpgport -lxslt -lxml2 -lpam -lssl -lcrypto -lgssapi_krb5 -lz -ledit -lrt -lcrypt -ldl -lm 

VERSION = PostgreSQL 9.5.9

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