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rng-tools for arm linux (based uclibc，not GNU libc)

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# rng-tools
rng-tools for arm linux (forked from https://github.com/nhorman/rng-tools.git)

As we all know,GNU libc is powerfull but size is very big,so it not suitable for embedded device(ex. router or gateway),so many device used uclibc instead of GNU libc.

the original rng-tools 6.5 is cross compile with arm-linux-gnueabi-gcc(GNU libc),but not build succcessful with arm-linux-gcc(uclibc),because argp.h is error whenver build.

rng-tools是从 https://github.com/nhorman/rng-tools.git 分支而来的，经过二次修改，可以支持uclibc的arm-linux-gcc交叉编译，原版并不支持uclibc，只支持GNU libc，所以在uclibc的平台不能使用。

#### 编译方法
##### 先编译libsysfs库，由于rng-tools需要依赖这个包：
libsysfs下载地址：https://sourceforge.net/projects/linux-diag/files/sysfsutils/2.1.0/sysfsutils-2.1.0.tar.gz/download

```bash
#gnuzip sysfsutils-2.1.0.tar.gz
#cd sysfsutils-2.1.0
#./configure --host=arm-linux --prefix=$PWD/install
#make
#make install
```
至此，就会在sysfsutils-2.1.0/install目录下生成所有的库文件

### 接下来我们编译rng-tools,注意sysfsutils-2.1.0和rng-tools在同一个目录

```sh
#git clone https://github.com/actg/rng-tools.git
#cd rng-tools
#export LDFLAGS=-L../sysfsutils-2.1.0/install/lib/
#export CPPFLAGS=-I../sysfsutils-2.1.0/install/include
#./configure --host=arm-linux --prefix=$PWD/install --without-libgcrypt --without-nistbeacon
#make
#make install
```

至此，就会在sysfsutils-2.1.0/install目录下生成rngd可执行文件，使用方法如下：

#### rngd使用方法：

- 如果你的硬件支持/dev/hwrng硬件真随机数，那么直接运行就可以自动默认设置为后台daemon程序，会增加系统的熵值，在很多例如加密的应用中非常有用。

```sh
/sbin/rngd
```

- 如果你的硬件不支持/dev/hwrng真随机数，那么使用linux的伪随机数也可以，使用方法:
```sh
/sbin/rngd -r/dev/urandom
```

#### 查看系统熵值是多少
```sh
cat /proc/sys/kernel/random/entropy_avail
```

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