Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG). 548 Market St, PMB 57274, San Francisco, CA, USA. Download and save the SSL certificate of a website using Internet Explorer: 1.Click the Security report button (a padlock) in an address bar 2.Click the View Certificate button 3.Go to the Details.

  1. Download Certificate Chain From Website Openssl
  2. Download Certificate From Website Openssl Windows
  3. Openssl Certificate Request
  4. Openssl Download Certificate
  5. Openssl Get Certificate
  6. Download Cert From Website Openssl

# echo -n openssl s_client -connect HOST:PORTNUMBER

Download 'Win32 OpenSSL v1.1.0f Light' from 3 and install it as mentioned at 2. After installing Openssl, the path openssl.exe file should be added in the system path. That “oenssl.exe” can be run from our desired folder from the command prompt. Download and save the SSL certificate of a website using Internet Explorer: Click the Security report button (a padlock) in an address bar Click the View Certificate button Go to the Details tab. To generate a self-signed SSL certificate using the OpenSSL, complete the following steps: Write down the Common Name (CN) for your SSL Certificate. The CN is the fully qualified name for the system that uses the certificate.

  1. Connect to that webServer:
  2. Base64 encoded cert will be saved to certlog
  3. extract certificate data from certlog (“BEGIN CERTIFICATE” and “END CERTIFICATE” )
  4. confirm it did right job
  5. add it to the CA bundle

    few more tips:
    we can use following environment value to set CAPath and CAFile
    SS_CERT_DIR=/opt/etc/ssl/certs/ SSL_CERT_FILE=/path/to/ca.pem curl -v google.com

    we can also skip secure process with curl option: ‘-k’
    use curl option to set cafile: curl -v –cacert cacert.pem google.com

With SNI

If the remote server is using SNI (that is, sharing multiple SSL hosts on a single IP address) you will need to send the correct hostname in order to get the right certificate.

Without SNI

If the remote server is not using SNI, then you can skip -servername parameter:

To view the full details of a site’s cert you can use this chain of commands as well:

Converting Using OpenSSL

Download Certificate Chain From Website Openssl

These commands allow you to convert certificates and keys to different formats to make them compatible with specific types of servers or software.

  • Convert a DER file (.crt .cer .der) to PEM
  • Convert a PEM file to DER
  • Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM
  • Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)
  • Convert PEM to CRT (.CRT file)

OpenSSL Convert PEM

  • Convert PEM to DER
  • Convert PEM to P7B
  • Convert PEM to PFX

OpenSSL Convert DER

  • Convert DER to PEM

OpenSSL Convert P7B

  • Convert P7B to PEM
  • Convert P7B to PFX

OpenSSL Convert PFX

  • Convert PFX to PEM
Download Certificate From Website Openssl

Generate rsa keys by OpenSSL

  • Using OpenSSL on the command line you’d first need to generate a public and private key, you should password protect this file using the -passout argument, there are many different forms that this argument can take so consult the OpenSSL documentation about that.
  • This creates a key file called private.pem that uses 1024 bits. This file actually have both the private and public keys, so you should extract the public one from this file:

    You’ll now have public.pem containing just your public key, you can freely share this with 3rd parties. You can test it all by just encrypting something yourself using your public key and then decrypting using your private key, first we need a bit of data to encrypt:

  • Example file :
  • You now have some data in file.txt, lets encrypt it using OpenSSL and the public key:
  • This creates an encrypted version of file.txt calling it file.ssl, if you look at this file it’s just binary junk, nothing very useful to anyone. Now you can unencrypt it using the private key:
  • You will now have an unencrypted file in decrypted.txt:

Download Certificate From Website Openssl Windows

RSA TOOLS Options in OpenSSL

  • NAME

    rsa – RSA key processing tool


    openssl rsa [-help] [-inform PEM NET DER] [-outform PEM NET DER] [-in filename] [-passin arg] [-out filename] [-passout arg] [-aes128] [-aes192] [-aes256] [-camellia128] [-camellia192] [-camellia256] [-des] [-des3] [-idea] [-text] [-noout] [-modulus] [-check] [-pubin] [-pubout] [-RSAPublicKey_in] [-RSAPublicKey_out] [-engine id]


    The rsa command processes RSA keys. They can be converted between various forms and their components printed out. Note this command uses the traditional SSLeay compatible format for private key encryption: newer applications should use the more secure PKCS#8 format using the pkcs8 utility.


    Print out a usage message.

    This specifies the input format. The DER option uses an ASN1 DER encoded form compatible with the PKCS#1 RSAPrivateKey or SubjectPublicKeyInfo format. The PEM form is the default format: it consists of the DER format base64 encoded with additional header and footer lines. On input PKCS#8 format private keys are also accepted. The NET form is a format is described in the NOTES section.

    This specifies the output format, the options have the same meaning as the -inform option.

    This specifies the input filename to read a key from or standard input if this option is not specified. If the key is encrypted a pass phrase will be prompted for.

    the input file password source. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl.

    This specifies the output filename to write a key to or standard output if this option is not specified. If any encryption options are set then a pass phrase will be prompted for. The output filename should not be the same as the input filename.

    the output file password source. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl.

    These options encrypt the private key with the specified cipher before outputting it. A pass phrase is prompted for. If none of these options is specified the key is written in plain text. This means that using the rsa utility to read in an encrypted key with no encryption option can be used to remove the pass phrase from a key, or by setting the encryption options it can be use to add or change the pass phrase. These options can only be used with PEM format output files.

    prints out the various public or private key components in plain text in addition to the encoded version.

    this option prevents output of the encoded version of the key.

    this option prints out the value of the modulus of the key.

    this option checks the consistency of an RSA private key.

    by default a private key is read from the input file: with this option a public key is read instead.

    by default a private key is output: with this option a public key will be output instead. This option is automatically set if the input is a public key.

    like -pubin and -pubout except RSAPublicKey format is used instead.

    specifying an engine (by its unique id string) will cause rsa to attempt to obtain a functional reference to the specified engine, thus initialising it if needed. The engine will then be set as the default for all available algorithms.

  • NOTESThe PEM private key format uses the header and footer lines:

    The PEM public key format uses the header and footer lines:

    The PEM RSAPublicKey format uses the header and footer lines:

    The NET form is a format compatible with older Netscape servers and Microsoft IIS .key files, this uses unsalted RC4 for its encryption. It is not very secure and so should only be used when necessary.

    Some newer version of IIS have additional data in the exported .key files. To use these with the utility, view the file with a binary editor and look for the string “private-key”, then trace back to the byte sequence 0x30, 0x82 (this is an ASN1 SEQUENCE). Copy all the data from this point onwards to another file and use that as the input to the rsa utility with the -inform NET option.


    To remove the pass phrase on an RSA private key:

    To encrypt a private key using triple DES:

    To convert a private key from PEM to DER format:

    To print out the components of a private key to standard output:

    To just output the public part of a private key:

    Output the public part of a private key in RSAPublicKey format:

Disable Server verification:
# openssl s_client -showcerts -connect <server_url>:8883 -verify false

Generate openssl certificate

Retrieve openssl CA configuration:

# openssl version -d
WARNING: can’t open config file: /etc/openssl/openssl.cnf
OPENSSLDIR: “/etc/openssl”



How to create a .pem File for SSL Certificate Installations


Privacy Enhanced Mail (PEM) files are concatenated certificate containers frequently used in certificate installations when multiple certificates that form a complete chain are being imported as a single file. They are a defined standard in RFCs 1421 through 1424. They can be thought of as a layered container of chained certificates. A .pem file is a container format that may just include the public certificate or the entire certificate chain (private key, public key, root certificates):

  • Private Key
  • Server Certificate (crt, puplic key)
  • (optional) Intermediate CA and/or bundles if signed by a 3rd party

How to create a self-signed PEM file:
openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout key.pem -out cert.pem

How to create a PEM filefrom existing certificate files that form a chain:

  • (optional) Remove the password from the Private Key by following the steps listed below:
    • Type openssl rsa -in server.key -out nopassword.key and press Enter.
    • Enter the pass phrase of the Private Key.
  • Combine the private key, public certificate and any 3rd party intermediate certificate files:
    • cat nopassword.key > server.pem
    • cat server.crt >> server.pem
      • Repeat this step as needed for third-party certificate chain files, bundles, etc:
        cat intermediate.crt >> server.pem

Additional Information

Openssl Certificate Request

How to create a PEM file with the help of an automated script:

Openssl Download Certificate

  • Download NetIQ Cool Tool OpenSSL-Toolkit.
  • Select Create Certificates PEM with key and entire trust chain
  • Provide the full path to the directory containing the certificate files.
  • Provide the filenames of the following:
    • private key
    • public key (server crt)
    • (conditional) password for private key
    • (conditional) any intermediate certificate chain file(s)

Openssl Get Certificate

For additional information, please see TID 7015502 – Common Mistakes in SSL Certificate Management & Implementation.

The following details the structure of a typical .pem file (including the entire certificate chain):
(Private Key: domain_name.key contents)
(Primary SSL certificate: domain_name.crt contents)
(Intermediate certificate: certChainCA.crt contents)

Download Cert From Website Openssl


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