Sponsored Content
Top Forums Shell Programming and Scripting Encrypt/Decrypt string with rsa keys Post 302364736 by tjones1105 on Friday 23rd of October 2009 05:56:19 PM
Old 10-23-2009
Encrypt/Decrypt string with rsa keys

Hello,
I wanted to know if there was a way to encrypt a string, not a file using openssl and then decrypt it? I cant seem to get it to work.

This is what I have been trying but I'm not having much luck.
Code:
encTxt=`echo "$1" | openssl dgst -sha1 -binary | openssl rsautl -sign -inkey pri_keyfile.pem | openssl enc -base64`
echo `"$encTxt" | openssl enc -base64 -d | openssl rsautl -verify -inkey pub_keyfile.pem -pubin`

Thanks!
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Encrypt & Decrypt a String

Hi Everybody, I have a script that telnet another system. For some reasons, this is should be done by "root", so the root password has been written explicitly in this script, which mean any body read this script will know the root password of the other system. I think the solution is to write... (6 Replies)
Discussion started by: aldowsary
6 Replies

2. Shell Programming and Scripting

encrypt and decrypt password

how do i encrypt and decrypt a password (2 Replies)
Discussion started by: sanwish
2 Replies

3. Solaris

Decrypt Des file - then encrypt

Help.. I need to decrypt a file that was encrypted using DES 56 Bit. I have the encryption key and the block size used but no idea what utility to use.. I then need to encrypt the file using pgp and another key I have.. againt I dont know what utility to use. I am running solaris 9 .... ... (0 Replies)
Discussion started by: frustrated1
0 Replies

4. Shell Programming and Scripting

Encrypt and Decrypt script

Dear Experts, I am using one script name :volume.sh and its written in bash shell script. I just want to encrypt the script so that any one else cannot see it. please tell me the commands how to encrypt the script as well as to decrypt it. Regards, SHARY (9 Replies)
Discussion started by: shary
9 Replies

5. Shell Programming and Scripting

How to encrypt and decrypt a file

How to encrypt and decrypt a file using unix Command? Can any one help me? (2 Replies)
Discussion started by: laknar
2 Replies

6. Linux

RSA decrypt with public key ?

Dear All, I need to decrypt with private key most of the time and this works for RSA. At times I need to decrypt with public key (data is encrypted with private key). This does not seem to work via VB.Net. Is there support for such an activity in Java on Linux or Windows ? Please advise. ... (3 Replies)
Discussion started by: Sushma Y
3 Replies

7. Shell Programming and Scripting

Encrypt and decrypt a string

Hi, I want to encrypt and decrypt a string(database password) which will be used in my scripts. encrypt the string while storing in a file and while using it in other scripts it should decrypt. i tried below method. As it can decrypt easily, it is not recommended. encrypt=`perl -e 'print unpack... (5 Replies)
Discussion started by: rohan10k
5 Replies

8. Shell Programming and Scripting

Encrypt and Decrypt

I have script for all oracle prod db. I have hard coded the username / password. I need a mechanism to encode and decode the username / password in a shell script. Another challenge is I use the username and password in a Select command for oracle DB. How can call the decrypted... (2 Replies)
Discussion started by: ilugopal
2 Replies

9. Shell Programming and Scripting

Encrypt and decrypt a password in shell script

Hi All, very good morning all. I am trying to connect to informatica repository by using shell script. I have written pmrep connect command in the script file. But i need to provide repository, domain ,username and password to connect. Username and password are hard coded in the script... (8 Replies)
Discussion started by: SekhaReddy
8 Replies

10. UNIX for Beginners Questions & Answers

Encrypt and Decrypt a File with Password

Hello, I have few files on unix which are payroll related and I need them to encrypt with password so others wouldn't see the data. I use ETL tool and would like to know the unix command that does encryption/decryption to use in the ETL. Thank you, Sri (3 Replies)
Discussion started by: eskay
3 Replies
RSAUTL(1SSL)							      OpenSSL							      RSAUTL(1SSL)

NAME
openssl-rsautl, rsautl - RSA utility SYNOPSIS
openssl rsautl [-help] [-in file] [-out file] [-inkey file] [-keyform PEM|DER|ENGINE] [-pubin] [-certin] [-sign] [-verify] [-encrypt] [-decrypt] [-rand file...] [-writerand file] [-pkcs] [-ssl] [-raw] [-hexdump] [-asn1parse] DESCRIPTION
The rsautl command can be used to sign, verify, encrypt and decrypt data using the RSA algorithm. OPTIONS
-help Print out a usage message. -in filename This specifies the input filename to read data from or standard input if this option is not specified. -out filename Specifies the output filename to write to or standard output by default. -inkey file The input key file, by default it should be an RSA private key. -keyform PEM|DER|ENGINE The key format PEM, DER or ENGINE. -pubin The input file is an RSA public key. -certin The input is a certificate containing an RSA public key. -sign Sign the input data and output the signed result. This requires an RSA private key. -verify Verify the input data and output the recovered data. -encrypt Encrypt the input data using an RSA public key. -decrypt Decrypt the input data using an RSA private key. -rand file... A file or files containing random data used to seed the random number generator. Multiple files can be specified separated by an OS- dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others. [-writerand file] Writes random data to the specified file upon exit. This can be used with a subsequent -rand flag. -pkcs, -oaep, -ssl, -raw The padding to use: PKCS#1 v1.5 (the default), PKCS#1 OAEP, special padding used in SSL v2 backwards compatible handshakes, or no padding, respectively. For signatures, only -pkcs and -raw can be used. -hexdump Hex dump the output data. -asn1parse Parse the ASN.1 output data, this is useful when combined with the -verify option. NOTES
rsautl because it uses the RSA algorithm directly can only be used to sign or verify small pieces of data. EXAMPLES
Sign some data using a private key: openssl rsautl -sign -in file -inkey key.pem -out sig Recover the signed data openssl rsautl -verify -in sig -inkey key.pem Examine the raw signed data: openssl rsautl -verify -in sig -inkey key.pem -raw -hexdump 0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0070 - ff ff ff ff 00 68 65 6c-6c 6f 20 77 6f 72 6c 64 .....hello world The PKCS#1 block formatting is evident from this. If this was done using encrypt and decrypt the block would have been of type 2 (the second byte) and random padding data visible instead of the 0xff bytes. It is possible to analyse the signature of certificates using this utility in conjunction with asn1parse. Consider the self signed example in certs/pca-cert.pem . Running asn1parse as follows yields: openssl asn1parse -in pca-cert.pem 0:d=0 hl=4 l= 742 cons: SEQUENCE 4:d=1 hl=4 l= 591 cons: SEQUENCE 8:d=2 hl=2 l= 3 cons: cont [ 0 ] 10:d=3 hl=2 l= 1 prim: INTEGER :02 13:d=2 hl=2 l= 1 prim: INTEGER :00 16:d=2 hl=2 l= 13 cons: SEQUENCE 18:d=3 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 29:d=3 hl=2 l= 0 prim: NULL 31:d=2 hl=2 l= 92 cons: SEQUENCE 33:d=3 hl=2 l= 11 cons: SET 35:d=4 hl=2 l= 9 cons: SEQUENCE 37:d=5 hl=2 l= 3 prim: OBJECT :countryName 42:d=5 hl=2 l= 2 prim: PRINTABLESTRING :AU .... 599:d=1 hl=2 l= 13 cons: SEQUENCE 601:d=2 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 612:d=2 hl=2 l= 0 prim: NULL 614:d=1 hl=3 l= 129 prim: BIT STRING The final BIT STRING contains the actual signature. It can be extracted with: openssl asn1parse -in pca-cert.pem -out sig -noout -strparse 614 The certificate public key can be extracted with: openssl x509 -in test/testx509.pem -pubkey -noout >pubkey.pem The signature can be analysed with: openssl rsautl -in sig -verify -asn1parse -inkey pubkey.pem -pubin 0:d=0 hl=2 l= 32 cons: SEQUENCE 2:d=1 hl=2 l= 12 cons: SEQUENCE 4:d=2 hl=2 l= 8 prim: OBJECT :md5 14:d=2 hl=2 l= 0 prim: NULL 16:d=1 hl=2 l= 16 prim: OCTET STRING 0000 - f3 46 9e aa 1a 4a 73 c9-37 ea 93 00 48 25 08 b5 .F...Js.7...H%.. This is the parsed version of an ASN1 DigestInfo structure. It can be seen that the digest used was md5. The actual part of the certificate that was signed can be extracted with: openssl asn1parse -in pca-cert.pem -out tbs -noout -strparse 4 and its digest computed with: openssl md5 -c tbs MD5(tbs)= f3:46:9e:aa:1a:4a:73:c9:37:ea:93:00:48:25:08:b5 which it can be seen agrees with the recovered value above. SEE ALSO
dgst(1), rsa(1), genrsa(1) COPYRIGHT
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 1.1.1a 2018-12-18 RSAUTL(1SSL)

Featured Tech Videos

All times are GMT -4. The time now is 12:46 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy