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OpenSSL "rsautl" Using OAEP Padding
What is the OAEP padding schema used in OpenSSL "rsautl" command? OAEP (Optimal Asymmetric Encryption Padding), also called PKCS#1 2.0, is a padding standard specified in RFC3447 "PKCS #1: RSA Encryption, Version 1.5" proposed by RSA Laboratories in 1998. OAEP padding can be illustrated by the diagr...
2017-04-22, 829👍, 0💬

OpenSSL "rsautl -encrypt -raw" - Data Too Large Error
Why am I getting the "data too large for key size" error with OpenSSL "rsautl -encrypt -raw" command? My input data is the same size as the RSA key and I am using no padding. In most case, you should be able to use the OpenSSL "rsautl -encrypt -raw" command to encrypt input data of the same size as ...
2017-04-22, 751👍, 0💬

OpenSSL "rsautl -oaep" - OAEP Padding Option
How to use OAEP padding with OpenSSL "rsautl" command? I was told to encrypt a password using an RSA public key with OAEP padding. OpenSSL "rsautl" uses PKCS#1 v1.5 padding as the default padding schema. So if you want to use OAEP padding, you have to using the "-oaep" option as shown below: C:\User...
2017-04-15, 1348👍, 0💬

OpenSSL "rsautl -sign" - RSA Signature Generation
What is the purpose of the OpenSSL "rsautl -sign" command? Can I use it to sign a document? Yes, you can use OpenSSL "rsautl -sign" command to sign a document. But you need other OpenSSL commands to generate a digest from the document first as shown in the following test: C:\Users\fyicenter&gt;d...
2017-04-04, 608👍, 0💬

OpenSSL Signing Documents with RSA Keys
What is the process of signing a document with RSA keys using OpenSSL commands? I was told to deliver a document with digital signature. Here are steps your need to follow to sign a document with your RSA private key using OpenSSL commands: 1. Get the document to be signed ready. 2. Generate a diges...
2017-04-04, 393👍, 0💬

OpenSSL Verify Signed Documents with RSA Keys
What is the process of verifying the signed document with RSA keys using OpenSSL commands? I received a signed document and was to verify it with senders RSA public key. Here are steps your need to follow to verify a signed document with sender's RSA public key using OpenSSL commands: 1. Verify that...
2017-03-27, 390👍, 0💬

OpenSSL "rsautl -verify" - RSA Signature Verification
What is the purpose of the OpenSSL "rsautl -verify" command? Can I use it to verify a signed document? Yes, you can use OpenSSL "rsautl -verify" command to verify a signed document. But you need other OpenSSL commands to generate a digest from the document first. For example, you received 3 files as...
2017-03-25, 1274👍, 0💬

OpenSSL "rsautl -encrypt" vs. "rsautl -sign"
What is the difference between "rsautl -encrypt" and "rsautl -sign" commands? There are 2 differences between "rsautl -encrypt" and "rsautl -sign" commands: 1. "rsautl -encrypt" and "rsautl -sign" commands take different RSA keys: "rsautl -encrypt" only accepts an RSA public key and performs RSA enc...
2017-03-25, 840👍, 0💬

OpenSSL "rsautl -encrypt" vs. "rsautl -verify"
What is the difference between "rsautl -encrypt" and "rsautl -verify" commands? There is only 1 difference between "rsautl -encrypt" and "rsautl -verify" commands: 1. "rsautl -encrypt" and "rsautl -verify" commands apply PKCS#1 v1.5 padding differently: "rsautl -encrypt" adds PKCS#1 v1.5 padding bef...
2017-03-11, 537👍, 0💬

OpenSSL "rsautl -verify -raw" for RSA Public Key Encryption
What is the difference between "rsautl -encrypt" and "rsautl -verify" commands?\n \nThere is only 1 difference between "rsautl -encrypt" and "rsautl -verify" commands:\n\n\n1. "rsautl -encrypt" and "rsautl -verify" commands apply PKCS#1 v1.5 padding differently:\n\n\n"rsautl -encrypt" adds PKCS#1 v1...
2017-03-11, 401👍, 0💬

Download and Install OpenSSL Fulgan Binary for Windows
How to download OpenSSL for Windows? I heard that OpenSSL is a nice free tool to manage keys and certificates. You can download and install OpenSSL Windows version using these steps: 1. Go to the https://indy.fulgan.com/SSL/ Website. 2. Search and select the latest version that matches your Windows ...
2017-03-07, 9860👍, 1💬

OpenSSL "genrsa" and "rsa" Commands
Where to find tutorials on using OpenSSL "genrsa" and "rsa" commands? Here is a collection of tutorials on using OpenSSL "genrsa" and "rsa" commands compiled by FYIcenter.com team. Note that "genrsa" and "rsa" commands are superseded by "genpkey" and "pKey" commands now. Stop using "genrsa" and "rsa...
2017-02-28, 2614👍, 0💬

OpenSSL "rsautl -sign -raw" for RSA Private Key Decryption
What is the difference between "rsautl -encrypt" and "rsautl -verify" commands?\\n \\nThere is only 1 difference between "rsautl -encrypt" and "rsautl -verify" commands:\\n\\n\\n1. "rsautl -encrypt" and "rsautl -verify" commands apply PKCS#1 v1.5 padding differently:\\n\\n\\n"rsautl -encrypt" adds P...
2017-02-28, 498👍, 0💬

OpenSSL "genrsa" Command Options
What can I use OpenSSL "genrsa" command for? What are options supported by the "genrsa" command? OpenSSL "genrsa" command is a utility to generate RSA (Rivest, Shamir and Adleman) private key and public key pairs. Here are options supported by the "genrsa" command: C:\Users\fyicenter&gt;\loc al\o...
2017-02-24, 1027👍, 0💬

OpenSSL "genrsa" - Generate RSA Key Pair
How to generate a new RSA key pair using OpenSSL "genrsa" command? If you need a new RSA key pair in order to create a new certificate, you can use the OpenSSL "genrsa" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genrsa -out my_rsa.key Generating RSA ...
2017-02-24, 759👍, 0💬

OpenSSL "rsa" Command Options
What can I use OpenSSL "rsa" command for? What are options supported by the "rsa" command? OpenSSL "rsa" command is a utility to view RSA private keys and public keys. Here are options supported by the "rsa" command: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; rsa -help unkn...
2017-02-24, 526👍, 0💬

OpenSSL "ca" Error "./demoCA/newcerts: No such file or directory"
Why I am getting the "./demoCA/newcerts: No such file or directory" error when running OpenSSL "ca" command? If you are running the OpenSSL "ca" command installed with the slproweb binary package for Windows, you may get the "./demoCA/newcerts: No such file or directory" error as shown below: C:\Use...
2017-02-21, 6074👍, 2💬

💬 2017-02-21 FYIcenter.com: Hi sanakhan, thanks for the suggestion.

💬 2017-02-20 sanakhan: its simple just make another demoCA folder inside demoCA and put all files e.g certs,newcerts and serial text file inside it it ...

OpenSSL "rsa -text" - Print RSA Key in Text
How to print RSA private key contents in text format using OpenSSL "rsa" command? If you want to see contents of an RSA private key in text format, you can use the OpenSSL "rsa -text" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; rsa -in my_rsa.key -tex...
2017-02-03, 455👍, 0💬

OpenSSL "rsa -pubout" - Extract RSA Public Key
How to extract the public key from an RSA key file using OpenSSL "rsa" command? If you want to extract the public key out from an RSA key file (private key an public key), you can use the OpenSSL "rsa -pubout" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&g...
2017-02-03, 415👍, 0💬

OpenSSL "rsa -pubin" - View RSA Public Key
How to view contents of an RSA public key file using OpenSSL "rsa" command? If you want to view contents of an RSA public key stored in a file, you can use the OpenSSL "rsa -pubin" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; rsa -in my_rsa_pub.key -pu...
2017-01-29, 513👍, 0💬

OpenSSL "genrsa 10240" - Generate RSA Long Keys
How to generate a new RSA key pair with a longer key size using OpenSSL "genrsa" command? If you need a new RSA key pair with a longer key size for testing purpose, you can use the OpenSSL "genrsa" command as shown below: C:\Users\fyicenter&gt;time The current time is: 22:03:25.43 C:\Users\fyice...
2017-01-29, 484👍, 0💬

OpenSSL "genrsa 32" - Generate RSA Short Keys
How to generate a new RSA key pair with a shorter key size using OpenSSL "genrsa" command? If you need a new RSA key pair with a shorter key size for testing purpose, you can use the OpenSSL "genrsa" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genrsa ...
2017-01-29, 416👍, 0💬

OpenSSL "rsa" - Open Encrypted RSA Keys
How to open an encrypted RSA key file using OpenSSL "rsa" command? I was told the key file is DES encrypted and I know the password. If you are trying to open a password (encrypted) RSA key file using the "rsa" command, you will be prompted for the password as shown below: C:\Users\fyicenter&gt;...
2017-01-14, 1173👍, 0💬

OpenSSL "genrsa -des" - DES Encrypt RSA Keys
How to generate a new RSA key pair and encrypt the output with a DES password using OpenSSL "genrsa" command? If you want to secure your new RSA private key with a DES encryption, you can use the OpenSSL "genrsa -des" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&a...
2017-01-14, 491👍, 0💬

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