✨Shell脚本实现Base64 加密解密
加密算法
# !/bin/bash
# 全局变量
str=""
base64_encode_string(){
# 源数据
source_string=$1
echo "源数据：$1"
# 判断是否为空
if [ 0 -eq "${#source_string}" ]; then
echo "输入为空，退出"
return
fi
echo "正在执行..."
# 编码集Wnrm0b7QPpI1FGBYVizZXN84vTJqocOuD9aHdgSlt2jRyAKEe6kCxhsfwL5M3U+/
BASE64_CODE_TABLE=(W n r m 0 b 7 Q P p I 1 F G B Y V i z Z X N 8 4 v T J q o c O u D 9 a H d g S l t 2 j R y A K E e 6 k C x h s f w L 5 M 3 U + /)
# 不知道
FIRST_SOURCE_BYTE_DIVIDEND=0X04
SECOND_SOURCE_BYTE_DIVIDEND=0X10
THIRD_SOURCE_BYTE_DIVIDEND=0X40
# 标记
encode_state=1
#
last_source_byte=""
# 结果
result=""
# 将字符转化成ASCII码值
for((i=0;i<${#source_string};++i)){
#curChar='printf "%d" "${#source_string:i:1}";'
curChar=`printf "%d" "'${source_string:i:1}";`
echo curChar=$curChar
case $encode_state in
1)
index=$(( $curChar / $FIRST_SOURCE_BYTE_DIVIDEND ))
# echo "INDEX IN STATE 1 IS : $index"
result="$result${BASE64_CODE_TABLE[$index]}"
echo "结果：" $result
encode_state=2;;
2)
index_high=$(( ($last_source_byte % $FIRST_SOURCE_BYTE_DIVIDEND)* 0X10 ))
index_low=$(( $curChar / $SECOND_SOURCE_BYTE_DIVIDEND ))
index=$(( $index_high + $index_low ))
# echo "index in state 2 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}"
echo "结果：$result"
encode_state=3;;
3)
index_high=$(( ($last_source_byte % $SECOND_SOURCE_BYTE_DIVIDEND) * 0X04 ))
index_low=$(( $curChar / $THIRD_SOURCE_BYTE_DIVIDEND ))
index=$(( $curChar % $THIRD_SOURCE_BYTE_DIVIDEND ))
# echo "index2 in state 3 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}"
echo "结果：$result"
# 追加最后一位
index=$(( $curChar % 0x10 ))
result="$result${BASE64_CODE_TABLE[$index]}"
echo "追加结果：$result"
encode_state=1;;
esac
last_source_byte=$curChar
}
# process pading
case $encode_state in
2)
echo $FIRST_BYTE_DIVIDEND
index=$(( ($last_source_byte % $FIRST_SOURCE_BYTE_DIVIDEND) * 0X10 ))
#echo "index in pading state 2 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}==";;
3)
index=$(( ($last_source_byte % $SECOND_SOURCE_BYTE_DIVIDEND) * 0X04 ))
#echo "index in pading state 3 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}=";;
esac
echo "添加后缀：$result"
str=$result
}
# main函数
echo "开始加密..."
read m
echo $m
read n
# 第二种
echo "-------------------"
cat $1 |while read line
do
from=$line
base64_encode_string $from
#str=$?
# echo "输出：" $str
# 写入文件
echo "$str" >> to
done
# 加密
# 写入文件
#base64_encode_string $1
echo "加密结束..."
解密算法
# !/bin/bash
# 全局变量
str=""
_str=""
# 编码集Wnrm0b7QPpI1FGBYVizZXN84vTJqocOuD9aHdgSlt2jRyAKEe6kCxhsfwL5M3U+/
BASE64_CODE_TABLE=(W n r m 0 b 7 Q P p I 1 F G B Y V i z Z X N 8 4 v T J q o c O u D 9 a H d g S l t 2 j R y A K E e 6 k C x h s f w L 5 M 3 U + /)
# 16#---->ascii
fun(){
a=$1
b=`printf "%d" $a`
#echo $b |awk '{printf("%c", $1)}'
_str=`echo $b |awk '{printf("%c", $1)}'`
}
# 四个字符转化为正确的三个字符
get(){
# get
get=$1
echo "数据源" $1
# to
to=""
# size
size=4
if [[ $2 = 1 ]]; then
size = 3
elif [[ $2 = 2 ]]; then
size =2
fi
for((i=0;i<size;++i))do
# echo "循环I：$i ${get:i:1}"
for((j=0;j<64;j++))do
# echo "当前：$j ${BASE64_CODE_TABLE[$j]}"
if [[ ${get:i:1} = ${BASE64_CODE_TABLE[$j]} ]]; then
if [[ i < size-1 ]];then
to=$(( ($to + $j)* 0x10))
# 此时为十进制
echo "匹配：$i $j $to ${get:i:1}"
else
to=$(($to + $j))
fi
break
fi
done
done
get=""
# 十进制转化为十六进制
echo "十六进制结果" $to
if [[ size = 1 ]]; then
to=$to/0x04
tmp=$to / 0x100
tmp="\x${tmp}"
tmp=`printf "$tmp"`
to=$to >> 8
tmp="\x${to}"
tmp=`printf "$tmp"`
get=$get $tmp
elif [[ size = 2 ]]; then
to=$to/0x10
tmp="\x${to}"
tmp=`printf "$tmp"`
get=$get $tmp
else
printf "%d" $(( ($to / 65536) ))
tmp=$(( ($to / 65536) ))
fun $tmp
echo "_str:" $_str
to=$(( ($to % 65536) ))
tmp=$(( ($to / 256) ))
# tmp="\x${tmp}"
echo `printf "$tmp"`
tmp=`printf $tmp`
get="$get" "$tmp"
to=$to >> 8
get=$get `echo -e '\x${to % 0x100}'`
to=$to >> 8
get=$get `echo -e '\x${to % 0x100}'`
fi
echo "get----------->"
echo $get
}
base64_encode_string(){
# 源数据
source_string=$1
last=0
last_to=0
# 结果
result=""
# 判断是否为空
if [ 0 -eq "${#source_string}" ]; then
echo "输入为空，退出"
return
fi
# 结尾标记
end=0
echo "结尾： ${source_string:${#source_string}-3}"
if [ ${source_string:${#source_string}-2} = "==" ]; then
end=2
elif [ ${source_string:${#source_string}-1} = "=" ]; then
end=1
else
end=0
fi
# 判断字符串长度
len=${#source_string}
if [[ 4 = len ]]; then
echo "字符串长度小于4"
else
echo "字符串长度大于4"
m=${#source_string}-4
for((i=0;i<m;))
do
get ${source_string:i:4} 0
result=$result $?
i = $i + 4
done
fi
echo "对结尾进行处理..."
last=${source_string:${#source_string}-4:4}
echo $last
case $end in
0)
;;
1)
;;
2)
get $last 2
result=$result $?;;
esac
# 编码集Wnrm0b7QPpI1FGBYVizZXN84vTJqocOuD9aHdgSlt2jRyAKEe6kCxhsfwL5M3U+/
# BASE64_CODE_TABLE=(W n r m 0 b 7 Q P p I 1 F G B Y V i z Z X N 8 4 v T J q o c O u D 9 a H d g S l t 2 j R y A K E e 6 k C x h s f w L 5 M 3 U + /)
# 第一个字符取前六位，所以是对0100取整去掉最后两位，第二个是前一个字符的后两位和这个字符的
FIRST_SOURCE_BYTE_DIVIDEND=0X04
SECOND_SOURCE_BYTE_DIVIDEND=0X10
THIRD_SOURCE_BYTE_DIVIDEND=0X40
# 标记
encode_state=1
#
last_source_byte=""
# 结果
result=""
# 将字符转化成ASCII码值
for((i=0;i<${#source_string};++i)){
#curChar='printf "%d" "${#source_string:i:1}";'
curChar=`printf "%d" "'${source_string:i:1}";`
echo curChar=$curChar
case $encode_state in
1)
index=$(( $curChar / $FIRST_SOURCE_BYTE_DIVIDEND ))
echo "INDEX IN STATE 1 IS : $index"
result="$result${BASE64_CODE_TABLE[$index]}"
encode_state=2;;
2)
index_high=$(( ($last_source_byte % $FIRST_SOURCE_BYTE_DIVIDEND)* 0X10 ))
index_low=$(( $curChar / $SECOND_SOURCE_BYTE_DIVIDEND ))
index=$(( $index_high + $index_low ))
echo "index in state 2 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}"
encode_state=3;;
3)
index_high=$(( ($last_source_byte % $SECOND_SOURCE_BYTE_DIVIDEND) * 0X04 ))
index_low=$(( $curChar / $THIRD_SOURCE_BYTE_DIVIDEND ))
index=$(( $curChar % $THIRD_SOURCE_BYTE_DIVIDEND ))
echo "index2 in state 3 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}"
encode_state=1;;
esac
last_source_byte=$curChar
}
# process pading
case $encode_state in
2)
echo $FIRST_BYTE_DIVIDEND
index=$(( ($last_source_byte % $FIRST_SOURCE_BYTE_DIVIDEND) * 0X10 ))
#echo "index in pading state 2 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}==";;
3)
index=$(( ($last_source_byte % $SECOND_SOURCE_BYTE_DIVIDEND) * 0X04 ))
#echo "index in pading state 3 is: $index"
result="$result${BASE64_CODE_TABLE[$index]}=";;
esac
str=$result
}
# main函数 $1输入文件 $2输出文件
echo "开始解密..."
# 第二种
echo "-------------------"
get TSkr 0
read m
cat $1 |while read line
do
from=$line
echo "输入参数：$from"
base64_encode_string $from
# 写入文件
echo "$str" >> $2
done
echo "解密结束..."
BaseTo有点问题，十六进制取高两位会报错，Base暂时没问题，应该
本文来自博客园，作者：两小无猜，转载请注明原文链接：https://www.cnblogs.com/charlottepl/p/13361673.html
