Linux From Scratch - Version r12.2-776-multilib

Chapter 8. Installing Basic System Software

8.28. Libxcrypt-4.4.36

The Libxcrypt package contains a modern library for one-way hashing of passwords.

Approximate build time: 0.1 SBU
Required disk space: 12 MB

8.28.1. Installation of Libxcrypt

Prepare Libxcrypt for compilation: 

./configure --prefix=/usr                \
            --enable-hashes=strong,glibc \
            --enable-obsolete-api=no     \
            --disable-static             \
            --disable-failure-tokens

The meaning of the new configure options:

--enable-hashes=strong,glibc

Build strong hash algorithms recommended for security use cases, and the hash algorithms provided by traditional Glibc libcrypt for compatibility.

--enable-obsolete-api=no

Disable obsolete API functions. They are not needed for a modern Linux system built from source.

--disable-failure-tokens

Disable failure token feature. It's needed for compatibility with the traditional hash libraries of some platforms, but a Linux system based on Glibc does not need it.

Compile the package: 

make

To test the results, issue: 

make check

Install the package: 

make install
[Note]

Note

The instructions above disabled obsolete API functions since no package installed by compiling from sources would link against them at runtime. However, the only known binary-only applications that link against these functions require ABI version 1. If you must have such functions because of some binary-only application or to be compliant with LSB, build the package again with the following commands: 

make distclean
./configure --prefix=/usr                \
            --enable-hashes=strong,glibc \
            --enable-obsolete-api=glibc  \
            --disable-static             \
            --disable-failure-tokens
make
cp -av --remove-destination .libs/libcrypt.so.1* /usr/lib

8.28.2. Installation of Libxcrypt - 32bit

Clean previous build: 

make distclean

Prepare Libxcrypt for compilation: 

CC="gcc -m32" \
./configure --prefix=/usr                \
            --host=i686-pc-linux-gnu     \
            --libdir=/usr/lib32          \
            --enable-hashes=strong,glibc \
            --enable-obsolete-api=glibc  \
            --disable-static             \
            --disable-failure-tokens

Compile the package: 

make

Install the package: 

cp -av .libs/libcrypt.so* /usr/lib32/ &&
make install-pkgconfigDATA &&
ln -svf libxcrypt.pc /usr/lib32/pkgconfig/libcrypt.pc

8.28.3. Installation of Libxcrypt - x32bit

Clean previous build: 

make distclean

Prepare Libxcrypt for compilation: 

CC="gcc -mx32" \
./configure --prefix=/usr                 \
            --host=x86_64-pc-linux-gnux32 \
            --libdir=/usr/libx32          \
            --enable-hashes=strong,glibc  \
            --enable-obsolete-api=glibc   \
            --disable-static              \
            --disable-failure-tokens

Compile the package: 

make

Install the package: 

cp -av .libs/libcrypt.so* /usr/libx32/ &&
make install-pkgconfigDATA &&
ln -svf libxcrypt.pc /usr/libx32/pkgconfig/libcrypt.pc

8.28.4. Contents of Libxcrypt

Installed libraries: libcrypt.so

Short Descriptions

libcrypt

Contains functions to hash passwords