Allow Sites To Use Key Generation In Forms
To answer the question, key generation in forms is allowing the form to generate its own key based off a parameter and some other information likely stored on the server the website is hosted on. My aim is to write a Java program to encrypt a text file (cipher text) using AES algorithm.And then, write another program to decrypt that encrypted file (cipher text) to get the plain text back.I want to use same key (same key, generate once, save it somewhere, and use it in both encryption and decryption program) for encryption and decryption process.
The algorithm is selected using the -t option and key size using the -b option. The following commands illustrate: ssh-keygen -t rsa -b 4096 ssh-keygen -t dsa ssh-keygen -t ecdsa -b 521 ssh-keygen -t ed25519 Specifying the File Name. Normally, the tool prompts for the file in which to store the key.
Applies to:
SAP Netweaver PI based SFTP Adapters
Summary
The following sections briefly describe the steps to create SSH key pairs which can be used as an alternative for password based authentication. It also includes steps to verify key based authentication and import the keys in NWA key storage. It mainly foucses on creating PKCS12 Keys from OpenSSH Keys.
Author(s):
Sivasubramaniam Arunachalam
Company: SAP Labs
Created on: 30-Dec-2011
Author(s) Bio
Sivasubramaniam Arunachalam is a senior developer at SAP Labs (Technology Innovation Platform). He is currently occupied with PI 7.31 development/maintenace activities. Since Sivasubramaniam joined SAP Labs in July 2010, he has developed new features in several adapters/areas including File, JDBC, IDoc, SOAP/XI, HTTP, JPR, B2B(RNIF 1.1/2.0, CIDX & PIDX) Adapters, XML Validation and Mapping Runtime. Currently, he is the component responsible for File, JDBC, B2B Adapters and XML Validation and takes care of all new development, enhancement and maintenance activities.
Table of Contents
Tools Required
- PuTTY Key Generator
- PuTTY
- Open SSL Utility
- SSH Key Generator
- Cygwin(for Windows Users) with the following packages
- OpenSSL
- SSH
Keys to be Generated
- Public Key (OpenSSH Format)
- Private Key (Putty Format)
- Private Key (PEM)
- Public Key (X.509 Certificate)
- Private Key (PKCS 12)
Use PuTTY Key Generator to Create SSH Public/Private Keys
- Download PuTTYgen.exe from http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
- Select SSH2-RSA as a key type
- Click on 'Generate' and move your mouse cursor in 'Key' section to generate the keys based on random mouse move co-ordinates.
- After the required mouse movements, it will generate the random key
- Click 'Save public key' and save it as 'public_key' name
- It will look like below
- Click 'Save private key' and save it as 'private_key.ppk' name
- It will look like below
- Leave Passphrase fields as blank and Select Conversions -> Export OpenSSH key
- Ignore the warning by choosing 'Yes'
- Save it under 'private_key.pem' name
- It will look like below
- The following keys are created
Use Open SSL to Create X.509 and P12 Certificates
- If you are in windows, use Cygwin
- Navigate to the location where the keys generated above are stored
- Create the X509 certificate from the private key
- It will look like below
- Create the PKCS type 12 Keystore
- Provide the password (which will be used in channel configuration)
- The created key would be in encrypted (binary) form
Import the Private Key into NWA Key Store
- Open the nwa key store and create a new view called SFTP_TEST
- Click on 'Import Entry' and select the generated p12 file
- After import, verify the entries.
Configure the Public Key in SSH Server
- Copy the public key in to SSH Server via SFTP
- Login to SSH server verify the copied public key
- Since the public key does not have any permissions, change it to 400 (for read)
- Use ssh-keygen tool to create openSSH format public key
- Add the created openSSH public key to authorized_keys filles
- Check the permissions of .ssh folder and authorized_keys file for access permissions
Verify the Key Pairs with PuTTY
- Now, the key based authentication can be verified with PuTTY.
- Enter the host name and port
- Select the private key (.ppk)
- Confirm the Security alert
- If the configuration is correct, the connection will be established successfully
Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data. The IV does not have to be secret, but should be changed for each session. Asymmetric algorithms require the creation of a public key and a private key. The public key can be made public to anyone, while the private key must known only by the party who will decrypt the data encrypted with the public key. This section describes how to generate and manage keys for both symmetric and asymmetric algorithms.
Symmetric Keys
The symmetric encryption classes supplied by the .NET Framework require a key and a new initialization vector (IV) to encrypt and decrypt data. Whenever you create a new instance of one of the managed symmetric cryptographic classes using the parameterless constructor, a new key and IV are automatically created. Anyone that you allow to decrypt your data must possess the same key and IV and use the same algorithm. Generally, a new key and IV should be created for every session, and neither the key nor IV should be stored for use in a later session.
To communicate a symmetric key and IV to a remote party, you would usually encrypt the symmetric key by using asymmetric encryption. Sending the key across an insecure network without encrypting it is unsafe, because anyone who intercepts the key and IV can then decrypt your data. For more information about exchanging data by using encryption, see Creating a Cryptographic Scheme.
The following example shows the creation of a new instance of the TripleDESCryptoServiceProvider class that implements the TripleDES algorithm.
When the previous code is executed, a new key and IV are generated and placed in the Key and IV properties, respectively.
Sometimes you might need to generate multiple keys. In this situation, you can create a new instance of a class that implements a symmetric algorithm and then create a new key and IV by calling the GenerateKey and GenerateIV methods. The following code example illustrates how to create new keys and IVs after a new instance of the symmetric cryptographic class has been made.
When the previous code is executed, a key and IV are generated when the new instance of TripleDESCryptoServiceProvider is made. Another key and IV are created when the GenerateKey and GenerateIV methods are called.
Asymmetric Keys
The .NET Framework provides the RSACryptoServiceProvider and DSACryptoServiceProvider classes for asymmetric encryption. These classes create a public/private key pair when you use the parameterless constructor to create a new instance. Asymmetric keys can be either stored for use in multiple sessions or generated for one session only. While the public key can be made generally available, the private key should be closely guarded.
A public/private key pair is generated whenever a new instance of an asymmetric algorithm class is created. After a new instance of the class is created, the key information can be extracted using one of two methods:
The ToXmlString method, which returns an XML representation of the key information.
The ExportParameters method, which returns an RSAParameters structure that holds the key information.
Both methods accept a Boolean value that indicates whether to return only the public key information or to return both the public-key and the private-key information. An RSACryptoServiceProvider class can be initialized to the value of an RSAParameters structure by using the ImportParameters method.
Key Generator
Windows 8 pro pack product key generator for microsoft office 2016. Key generator. Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more on how to store a private key in a key container, see How to: Store Asymmetric Keys in a Key Container.
The following code example creates a new instance of the RSACryptoServiceProvider class, creating a public/private key pair, and saves the public key information to an RSAParameters structure.