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OpenSSL "genpkey -paramfile" - Generate EC Key
How to generate a new EC private key using OpenSSL "genpkey" command? If you need a new EC private key in order to create a new certificate, you can use the OpenSSL "genpkey" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genpkey -paramfile my_ec.prm -ou...
2017-08-08, 514👍, 0💬

OpenSSL "genpkey dh_paramgen_prime_len:3072" - DH Long Keys
How to generate a new DH key pair with a longer key size using OpenSSL "genpkey" command? If you need a new DH key pair with a longer key size for testing purpose, you can use the OpenSSL "genpkey" command as shown below: C:\Users\fyicenter&gt;time The current time is: 22:17:06.45 C:\Users\fyice...
2017-07-25, 510👍, 0💬

OpenSSL "genpkey dh_paramgen_generator:3" - DH Param Generator
How to use a different DH key generation parameter generator with OpenSSL "genpkey -genparam" command? When you use OpenSSL "genpkey -genparam -algorithm dh" command to generate DH key generation parameters, the default generator 2 will be used. You can change it by using the "-pkeyopt dh_paramgen_g...
2017-07-25, 447👍, 0💬

OpenSSL "pkey -text" - Print EC Key in Text
How to print private key contents in text format using OpenSSL "pkey" command? If you want to see contents of a private key in text format, you can use the OpenSSL "pkey -text" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; pkey -in my_ec.key -text -noou...
2017-07-21, 436👍, 0💬

OpenSSL "genpkey -genparam" - Generate EC Parameters
How to generate a new EC parameter file using OpenSSL "genpkey -genparam" command? If you need a new EC parameter file in order to create new EC keys, you can use the OpenSSL "genpkey -genparam" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genpkey -gen...
2017-07-15, 888👍, 0💬

OpenSSL "genpkey" Command for EC Keys
Where to find tutorials on using OpenSSL "genpkey" and "pkey" commands for EC private keys? Here is a collection of tutorials on using OpenSSL "genpkey" and "pkey" commands compiled by FYIcenter.com team to generate and manage EC (Elliptic Curve) private keys OpenSSL "genpkey -genparam" - Generate E...
2017-07-15, 736👍, 0💬

OpenSSL "pkey -pubin" - View EC Public Key
How to view contents of a EC public key file using OpenSSL "pkey" command? If you want to view contents of a EC public key stored in a file, you can use the OpenSSL "pkey -pubin" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; pkey -pubin -in my_ec_pub.ke...
2017-07-03, 457👍, 0💬

OpenSSL "pkey -pubout" - Extract EC Public Key
How to extract the public key from a EC key file using OpenSSL "pkey" command? If you want to extract the public key out from a EC key file (private key an public key), you can use the OpenSSL "pkey -pubout" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt;...
2017-07-03, 425👍, 0💬

OpenSSL "genpkey ec_paramgen_curve:secp521r1" - EC Long Keys
How to generate a new EC key pair with a longer key size using OpenSSL "genpkey" command? If you need a new EC key pair with a longer key size for testing purpose, you can use the OpenSSL "genpkey" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&gt; genpkey -genp...
2017-06-28, 724👍, 0💬

OpenSSL "ecparam -list_curves" - List of EC Curves
What EC curves are supported by OpenSSL for generating EC keys? I want a list of all EC curves. If you want a list of all EC curves, you can use the OpenSSL "ecparam" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&gt; ecparam -list_curves secp112r1 : SECG/WTLS c...
2017-06-23, 911👍, 0💬

OpenSSL "genpkey -des" - DES Encrypt EC Keys
How to generate a new EC key pair and encrypt the output with a DES password using OpenSSL "genpkey" command? If you want to secure your new EC private key with a DES encryption, you can use the OpenSSL "genpkey -des" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&a...
2017-06-23, 417👍, 0💬

OpenSSL "rsautl" Command Options
What can I use OpenSSL "rsautl" command for? What are options supported by the "rsautl" command? OpenSSL "rsautl" command is a utility to sign, verify, encrypt and decrypt data using RSA private key and public key. Here are options supported by the "rsautl" command: C:\Users\fyicenter&gt;\loc al\...
2017-06-16, 434👍, 0💬

OpenSSL "pkey" - Open Encrypted EC Keys
How to open an encrypted EC key file using OpenSSL "pkey" command? I was told the key file is DES encrypted and I know the password. If you are trying to open a password (encrypted) EC key file using the "pkey" command, you will be prompted for the password as shown below: C:\Users\fyicenter&gt;...
2017-06-16, 383👍, 0💬

OpenSSL "rsautl -decrypt" - Decryption with RSA Private Key
How to decrypt a file with the RSA private key using OpenSSL "rsautl" command? I received a file that is encrypted with my RSA public key. If you receive a file encrypted with your RSA public key and want to decrypt the file with your RSA private key, you can use the OpenSSL "rsault -decrypt" comman...
2017-06-11, 998👍, 0💬

OpenSSL "rsautl -encrypt" - Encryption with RSA Public Key
How to encrypt a file with an RSA public key using OpenSSL "rsautl" command? If you want to encrypt a file with an RSA public in order to send private message to the owner of the public key, you can use the OpenSSL "rsault -encrypt" command as shown below: C:\Users\fyicenter&gt;type clear.txt Th...
2017-06-11, 682👍, 0💬

OpenSSL rsautl "data too large for key size" Error
Why am I getting the "data too large for key size" error, when using OpenSSL "rsautl" command to encrypt a large file? Because of the nature of the RSA algorithm, a single encryption process can only encrypt input data that is smaller than the modulus value of the RSA key. In other words, the size (...
2017-06-07, 1626👍, 0💬

OpenSSL "rsautl" - Encrypt Large File with RSA Key
How to encrypt a large file with an RSA public key using OpenSSL "rsautl" command? If you are trying to use an RSA public key to encrypt a file larger than the key size directly, you will get the "data too large for key size" error. One option to resolve the problem is to use the RSA-AES hybrid encr...
2017-06-07, 647👍, 0💬

OpenSSL "rsautl" Command for RSA Keys
Where to find tutorials on using OpenSSL "genpkey" and "rsautl" commands for RSA private keys? Here is a collection of tutorials on using OpenSSL "rsautl" command compiled by FYIcenter.com team to encrypt, decrypt, sign or verify data with RSA (Rivest, Shamir and Adleman) public and private keys. Op...
2017-05-29, 928👍, 0💬

OpenSSL "pkey -aes*" - Re-Encrypt EC Keys
How to re-encrypt a EC key file using OpenSSL "pkey" command? I want to change the encryption password, and maybe change the encryption algorithm. If you want to encrypt an existing EC key file again, you can use the "pkey -aes*" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opens...
2017-05-29, 358👍, 0💬

OpenSSL "rsautl" - Decrypt Large File with RSA Key
How to decrypt a large file with an RSA private key using OpenSSL "rsautl" command? I received a large encrypted file from my friend who used the RSA-AES hybrid encryption process with my public key. If your friend encrypted a large file with the RSA-AES hybrid encryption process with your public ke...
2017-05-20, 562👍, 0💬

OpenSSL "rsautl" Using PKCS#1 v1.5 Padding
What is the PKCS#1 v1.5 padding schema used in OpenSSL "rsautl" command? PKCS#1 v1.5 padding schema is a padding standard specified in RFC2313 "PKCS #1: RSA Encryption, Version 1.5" proposed by RSA Laboratories in 1998. PKCS#1 v1.5 padding schema is designed to pad input data to a full encryption bl...
2017-05-12, 693👍, 0💬

OpenSSL "rsautl -pkcs" - PKCS#1 v1.5 Padding Option
How to use RSA PKCS#1 v1.5 padding with OpenSSL "rsautl" command? I was told to encrypt a password using an RSA public key with PKCS#1 padding. OpenSSL "rsautl" uses PKCS#1 v1.5 padding as the default padding schema. But you can explicitly specify PKCS#1 v1.5 padding by using the "-pkcs" option as s...
2017-05-12, 656👍, 0💬

OpenSSL "rsautl -encrypt -raw" - No Padding
Can I use OpenSSL "rsautl" command to encrypt data without any padding? Yes, you can encrypt data without any padding using the OpenSSL "rsautl -encrypt -raw" command. But you need to remember the following: No padding requires the input data to be the same size as the RSA key. No padding requires t...
2017-04-28, 999👍, 0💬

OpenSSL "rsautl" - PKCS#1 v1.5 Padding Size
Whet is the PKCS#1 v1.5 padding size with OpenSSL "rsautl -encrypt" command? I want to know the largest size of data that I can encrypt with my RSA key. The minimum padding size of PKCS#1 v1.5 padding schema is 11 bytes which contains at least 8 bytes of random string. So if you are using the "-pkcs...
2017-04-28, 416👍, 0💬

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