Convert pem to crt and key

Question

Can anyone tell me the correct way command to extract convert the certificate  crt and private key  key files from a  pem file  I just read they are interchangable  but not how

User · Answer

This is what I did on windows   Download a zip file that contains the open ssl exe from Google Unpack the zip file and go into the bin folder  Go to the address bar in the bin folder and type cmd  This will open a command prompt at this folder  move Put the  pem file into this bin folder  Run two commands  One creates the cert and the second the key file  openssl x509 -outform der -in yourPemFilename pem -out certfileOutName crt openssl rsa -in yourPemFilename pem -out keyfileOutName key

User · Answer

0  Prerequisite  openssl  should be installed  On Windows  if Git Bash is installed  try that  Alternate binaries can be found here   1  Extract  key from  pem   openssl pkey -in cert pem -out cert key   2  Extract  crt from  pem   openssl crl2pkcs7 -nocrl -certfile cert pem   openssl pkcs7 -print certs -out cert crt

User · Answer

If you asked this question because you re using mkcert then the trick is that the  pem file is the cert and the -key pem file is the key    You don t need to convert  just run mkcert yourdomain dev otherdomain dev

User · Answer

To extract the key and cert from a pem file   Extract key  openssl pkey -in foo pem -out foo key   Another method of extracting the key     openssl rsa -in foo pem -out foo key   Extract all the certs  including the CA Chain  openssl crl2pkcs7 -nocrl -certfile foo pem   openssl pkcs7 -print certs -out foo cert   Extract the textually first cert as DER  openssl x509 -in foo pem -outform DER -out first-cert der

User · Answer

I was able to convert pem to crt using this   openssl x509 -outform der -in your-cert pem -out your-cert crt

User · Answer

A  crt stores the certificate    in pem format   So a  pem  while it can also have other things like a csr  Certificate signing request   a private key  a public key  or other certs  when it is storing just a cert  is the same thing as a  crt   A pem is a base 64 encoded file with a header and a footer between each section   To extract a particular section  a perl script such as the following is totally valid  but feel free to use some of the openssl commands    perl -ne    n   if  BEGIN   print if   n    1  amp  amp   BEGIN     END    mydomain pem   where   1 can be changed to which ever section you need   Obviously if you know exactly the header and footer you require and there is only one of those in the file  usually the case if you keep just the cert and the key in there   you can simplify it    perl -ne  print if   -----BEGIN CERTIFICATE-----       END    mydomain pem

User · Answer

Converting Using 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  openssl x509 -inform der -in certificate cer -out certificate pem  Convert a PEM file to DER  openssl x509 -outform der -in certificate pem -out certificate der  Convert a PKCS 12 file   pfx  p12  containing a private key and certificates to PEM  openssl pkcs12 -in keyStore pfx -out keyStore pem -nodes  You can add -nocerts to only output the private key or add -nokeys to only output the certificates   Convert a PEM certificate file and a private key to PKCS 12   pfx  p12   openssl pkcs12 -export -out certificate pfx -inkey privateKey key -in certificate crt -certfile CACert crt  Convert PEM to CRT   CRT file   openssl x509 -outform der -in certificate pem -out certificate crt    OpenSSL Convert PEM   Convert PEM to DER  openssl x509 -outform der -in certificate pem -out certificate der  Convert PEM to P7B  openssl crl2pkcs7 -nocrl -certfile certificate cer -out certificate p7b -certfile CACert cer  Convert PEM to PFX  openssl pkcs12 -export -out certificate pfx -inkey privateKey key -in certificate crt -certfile CACert crt    OpenSSL Convert DER   Convert DER to PEM  openssl x509 -inform der -in certificate cer -out certificate pem    OpenSSL Convert P7B   Convert P7B to PEM  openssl pkcs7 -print certs -in certificate p7b -out certificate cer  Convert P7B to PFX  openssl pkcs7 -print certs -in certificate p7b -out certificate cer  openssl pkcs12 -export -in certificate cer -inkey privateKey key -out certificate pfx -certfile CACert cer    OpenSSL Convert PFX   Convert PFX to PEM  openssl pkcs12 -in certificate pfx -out certificate cer -nodes    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   openssl genrsa -out private pem 1024  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   openssl rsa -in private pem -out public pem -outform PEM -pubout  or  openssl rsa -in private pem -pubout  gt  public pem  or  openssl rsa -in private pem -pubout -out public pem      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    echo  too many secrets   gt  file txt  You now have some data in file txt  lets encrypt it using OpenSSL and the public key   openssl rsautl -encrypt -inkey public pem -pubin -in file txt -out file ssl  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   openssl rsautl -decrypt -inkey private pem -in file ssl -out decrypted txt  You will now have an unencrypted file in decrypted txt   cat decrypted txt  output - gt  too many secrets    RSA TOOLS Options in OpenSSL   NAME     rsa - RSA key processing tool  SYNOPSIS     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   DESCRIPTION     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   COMMAND OPTIONS  -help      Print out a usage message    -inform DER NET PEM      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    -outform DER NET PEM      This specifies the output format  the options have the same meaning as the -inform option    -in filename      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    -passin arg      the input file password source  For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl    -out filename      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    -passout password      the output file password source  For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl    -aes128 -aes192 -aes256 -camellia128 -camellia192 -camellia256 -des -des3 -idea      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    -text      prints out the various public or private key components in plain text in addition to the encoded version    -noout      this option prevents output of the encoded version of the key    -modulus      this option prints out the value of the modulus of the key    -check      this option checks the consistency of an RSA private key    -pubin      by default a private key is read from the input file  with this option a public key is read instead    -pubout      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    -RSAPublicKey in  -RSAPublicKey out      like -pubin and -pubout except RSAPublicKey format is used instead    -engine id      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   NOTES  The PEM private key format uses the header and footer lines   -----BEGIN RSA PRIVATE KEY-----  -----END RSA PRIVATE KEY-----   The PEM public key format uses the header and footer lines   -----BEGIN PUBLIC KEY-----  -----END PUBLIC KEY-----   The PEM RSAPublicKey format uses the header and footer lines   -----BEGIN RSA PUBLIC KEY-----  -----END RSA PUBLIC KEY-----      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    EXAMPLES  To remove the pass phrase on an RSA private key    openssl rsa -in key pem -out keyout pem   To encrypt a private key using triple DES    openssl rsa -in key pem -des3 -out keyout pem   To convert a private key from PEM to DER format     openssl rsa -in key pem -outform DER -out keyout der   To print out the components of a private key to standard output     openssl rsa -in key pem -text -noout   To just output the public part of a private key     openssl rsa -in key pem -pubout -out pubkey pem   Output the public part of a private key in RSAPublicKey format     openssl rsa -in key pem -RSAPublicKey out -out pubkey pem

[ssl] Convert .pem to .crt and .key

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