glibc contains two versions of finction stpncpy
sh-4.2$ nm --dynamic --defined-only /lib64/libc.so.6 | grep stpncpy
0000003ce1c89b00 i stpncpy
0000003ce1c89b00 i __stpncpy
0000003ce1d040a0 T __stpncpy_chk

We should use more portable version of stpncpy without prefix with underscores.

The function __stpncpy was used in initial veersion
e65c65fc710fa030bfb8319efc43fcdc9ce5a26f, which was based on
http://people.redhat.com/drepper/SHA-crypt.txt

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

The size of output buffer(obufsize) was longer than initialised data.
In calculation, uint32_t was used for length of the cryptotext,
but uint16_t was written into buffer. The end of buffer was not initialised
and it caused valgrind warning.

 Use of uninitialised value of size 8
    at 0x37AE40F363: pl_base64_encode_buffer (nssb64e.c:180)
    by 0x37AE40F6ED: NSSBase64_EncodeItem_Util (nssb64e.c:482)
    by 0x37AE40F87A: BTOA_DataToAscii_Util (nssb64e.c:721)
    by 0x40208A: sss_base64_encode (nss_base64.c:47)
    by 0x403305: sss_password_encrypt (nss_obfuscate.c:358)

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

Use a script to update DEBUG macro invocations to use it as a variadic
macro, supplying format string and its arguments directly, instead of
wrapping them in parens.

This script was used to update the code:

grep -rwl --include '*.[hc]' DEBUG . |
    while read f; do
        mv "$f"{,.orig}
        perl -e \
            'use strict;
             use File::Slurp;
             my $text=read_file(\*STDIN);
             $text=~s#(\bDEBUG\s*\([^(]+)\((.*?)\)\s*\)\s*;#$1$2);#gs;
             print $text;' < "$f.orig" > "$f"
        rm "$f.orig"
    done

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>

Declarations of public functions was in header files,
but header files was not included in implementation file.

Some platform have header file endian.h and anothers have sys/endian.h.
We nedd to use conditional build to handle it correctly, therefore new header
file sss_endian.h was created.

Implemented working versions of the following functions for libcrypto:
 sss_base64_encode
 sss_base64_decode
 sss_hmac_sha1
 sss_password_encrypt
 sss_password_decrypt

test_encrypt_decrypt now expects EOK from libcrypto.
test_hmac_sha1 now expects EOK from libcrypto.
Added test_base64_encode to test base64 encoding implementation.
Added test_base64_decode to test base64 decoding implementation.

Signed-off-by: George McCollister <George.McCollister@gmail.com>

Adds two utility functions to obfuscate a password and inverse to
extract the cleartext password back.

So far, only NSS-based implementation is provided.