Shulou(Shulou.com)06/02 Report--

Generation of passwords and encryption and decryption

1. Original code

Cat gen_en_de_pswd.sh

#! / bin/bash

Case $1 in

1)

# randomly generate n-bit digital strings

Echo-e "Enter your password length:"

Read length

If [$length-gt 10]; then

Pw= `cat / dev/urandom | head-n 10 | md5sum | head-c $roomth`

Echo "The password is:" $pw

Elif [$length-le 10] & & [$length-ge 5]; then

Pw= `cat / dev/urandom | head-n 10000 | sed's / [^ a-zA-Z0-9] / / g'| strings-n $length | head-c $roomth`

Echo "The password is:" $pw

Else

Echo "Your password is too short,Please try again!"

Fi

2)

# simple encryption of strings

Echo-e "Enter your password which need to encrypt:"

Read passwd

En_tmp= `echo $passwd | tr '0123456789 ANzmGTO OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' ANzmGT#$&*0123456789' | tr' echo 'ANzmGTH

Len= `echo ${# en_tmp} `

If [$len-lt 10]; then

Suf_len= `expr 10-$len`

Suffixal= `cat / dev/urandom | head-n 1000 | sed's / [^ a-zA-Z0-9] / / g'| strings-n $suf_len | head-n 1 | head-c $suf_ len`

En_pw= `echo ${suf_len} ${en_tmp} ${suffixal} | Rev`

# echo $en_pw

Elif [$len-eq 10]; then

Suf_len=0

En_pw= `echo ${suf_len} ${en_tmp} | Rev`

Elif [$len-eq 11]; then

Suf_len=$

En_pw= `echo ${suf_len} ${en_tmp} ${suf_len} | Rev`

Else

En_pw= `echo $en_tmp | rev`

# echo $en_pw

Fi

Encrypt_pswd=''

For i in `seq ${# en_pw} `

Do

If [- n "$(echo ${en_pw:$i-1:1} | sed-n" / ^ [Amurz]\ + $/ p ")"]; then

Str= `echo ${en_pw:$i-1:1} | awk-v letter_cnt=26'

BEGIN {

I = 0

For (I = 0; I < letter_cnt; iTunes +)

{

Ch = sprintf ("% c", iTun65)

Trans_ table [ch] = I

Trans [25muri] = ch

}

}

{

If (NF = = 1)

{

A=trans_table [$1]

Printf ("% c", trans [a])

# printf ("% d", trans_table [$1])

}

}'`

Else

Str=$ {en_pw:$i-1:1}

Fi

Encrypt_pswd=$ {encrypt_pswd} ${str}

Done

Echo "Your encrypt password is:" $encrypt_pswd

3)

# decrypt the above two encrypted strings

Echo-e "Enter your password which need to decode:"

Read passwd

Decode_pd=''

For i in `seq ${# passwd} `

Do

If [- n "$(echo ${passwd:$i-1:1} | sed-n" / ^ [Amurz]\ + $/ p ")"]; then

Str= `echo ${passwd:$i-1:1} | awk-v letter_cnt=26'

BEGIN {

I = 0

For (I = 0; I < letter_cnt; iTunes +)

{

Ch = sprintf ("% c", iTun65)

Trans_ table [ch] = I

Trans [25muri] = ch

}

}

{

If (NF = = 1)

{

A=trans_table [$1]

Printf ("% c", trans [a])

# printf ("% d", trans_table [$1])

}

}'`

Else

Str=$ {passwd:$i-1:1}

Fi

Decode_pd=$ {decode_pd} ${str}

# echo $decode_pd

Done

First_str=$ {decode_pd:0:1}

Last_str=$ {decode_pd:-1}

If [${# decode_pd}-eq 11]; then

Tmp= `echo $decode_ pd`

Redundancy=$ {tmp:-1}

Len= `expr 10-$redundancy`

De_pw= `echo ${tmp:$ {redundancy}: ${len}} | rev | tr '0123456789 ANzmGThousand thanks thanks' ANzmGT#$&*0123456789' | tr 'BCDEFHIJKLMOPQRSUVWXYZabcdefghijklnopqrstuvwxy'' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' `

Elif [${# decode_pd}-eq 13] & & [$first_str = ='$'] & & [$last_str = ='$']; then

De_pw= `echo ${decode_pd:1:11} | rev | tr '0123456789 ANzmGThumbda' ANzmGT#$&*0123456789' | tr 'BCDEFHIJKLMOPQRSUVWXYZabcdefghijklnopqrstuvwxy'' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' `

Else

De_pw= `echo $decode_pd | rev | tr '0123456789 ANzmGThumbda' ANzmGT#$&*0123456789' | tr 'BCDEFHIJKLMOPQRSUVWXYZabcdefghijklnopqrstuvwxy'' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' `

Fi

Echo "Your decode password is:" $de_pw

*)

Echo "Please enter one parameter,choose the number.

1.generate code 2.encrypt passwd 3.decode passwd 4.Nothing "

Esac

2. How to use

2.1 generate a random password (enter the password length by yourself)

[oracle@hyhxdb ~] $sh gen_en_de_pswd.sh 1

Enter your password length:

eight

The password is: rK92pdQR

[oracle@hyhxdb ~] $sh gen_en_de_pswd.sh 1

Enter your password length:

eleven

The password is: 584253ce235

2.2 encrypt the generated string

[oracle@hyhxdb ~] $sh gen_en_de_pswd.sh 2

Enter your password which need to encrypt:

RK92pdQR

Your encrypt password is: 0KVWqcz*Ce2

[oracle@hyhxdb ~] $sh gen_en_de_pswd.sh 2

Enter your password which need to encrypt:

584253ce235

Your encrypt password is: $GmzrpmGzT&G$

2.3 decrypt encrypted strings

[oracle@hyhxdb ~] $sh gen_en_de_pswd.sh 3

Enter your password which need to decode:

0KVWqcz*Ce2

Your decode password is: rK92pdQR

[oracle@hyhxdb ~] $sh gen_en_de_pswd.sh 3

Enter your password which need to decode:

$GmzrpmGzT&G$

Your decode password is: 584253ce235

Second, simple application

1. Source code

Cat example.sh

#! / bin/bash

Function de_passwd ()

{

Passwd=$1

Decode_pd=''

For i in `seq ${# passwd} `

Do

If [- n "$(echo ${passwd:$i-1:1} | sed-n" / ^ [Amurz]\ + $/ p ")"]; then

Str= `echo ${passwd:$i-1:1} | awk-v letter_cnt=26'

BEGIN {

I = 0

For (I = 0; I < letter_cnt; iTunes +)

{

Ch = sprintf ("% c", iTun65)

Trans_ table [ch] = I

Trans [25muri] = ch

}

}

{

If (NF = = 1)

{

A=trans_table [$1]

Printf ("% c", trans [a])

}

}'`

Else

Str=$ {passwd:$i-1:1}

Fi

Decode_pd=$ {decode_pd} ${str}

Done

First_str=$ {decode_pd:0:1}

Last_str=$ {decode_pd:-1}

If [${# decode_pd}-eq 11]; then

Tmp= `echo $decode_ pd`

Redundancy=$ {tmp:-1}

Len= `expr 10-$redundancy`

De_pw= `echo ${tmp:$ {redundancy}: ${len}} | rev | tr '0123456789 ANzmGThousand thanks thanks' ANzmGT#$&*0123456789' | tr 'BCDEFHIJKLMOPQRSUVWXYZabcdefghijklnopqrstuvwxy'' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' `

Elif [${# decode_pd}-eq 13] & & [$first_str = ='$'] & & [$last_str = ='$']; then

De_pw= `echo ${decode_pd:1:11} | rev | tr '0123456789 ANzmGThumbda' ANzmGT#$&*0123456789' | tr 'BCDEFHIJKLMOPQRSUVWXYZabcdefghijklnopqrstuvwxy'' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' `

Else

De_pw= `echo $decode_pd | rev | tr '0123456789 ANzmGThumbda' ANzmGT#$&*0123456789' | tr 'BCDEFHIJKLMOPQRSUVWXYZabcdefghijklnopqrstuvwxy'' OPQRSUVWXYZBCDEFHIJKLMnopqrstuvwxyabcdefghijkl' `

Fi

Echo $de_pw

}

Pswd= `de _ passwd 'iImzMqtcuf2' `

# echo $pswd

Sqlplus-s shpgd/$ {pswd} @ shopguide

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