Something I have to do every time when updating SSL certificates on IIS web servers.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Extract private key and certificate from kpcs7 (.p7b) file. Generate a Private Key and a CSR. This is the simplest and most common requirement. You first need to generate a public private key pair and also a CSR. The CSR thus generated can be used by Certificate Authority (CA) to produce a SSL certificate. Below command can be used to convert a PKCS7 file (mywebsite.p7b) to a PEM file: openssl pkcs7. Nov 09, 2019 A.PFX (Personal Information Exchange) file is used to store a certificate and its private and public keys. For example, if we need to transfer SSL certificate from one windows server to another, You can simply export it as.pfx file using IIS SSL export wizard or MMC console. Sometimes we need to extract private keys and certificates from.pfx file, but we.
Preamble
P7B (PKCS#7)
A P7B file is a text file that contains certificates and chain certificates, but does not contain the private key.
PFX (PKCS#12)
A PFX file is a binary format file for storing the server certificate, any intermediate certificates, and the private key in one encrypt-able file.
Convert P7B to PFX
Note that in order to do the conversion, you must have both the certificates cert.p7b file and the private key cert.key file.
From the man page of pkcs7:
- -print_certs: prints out any certificates contained in the file.
- -in: specifies the input filename to read from.
- -out: specifies the output filename to write to.
From the man page of pkcs12:
Private Key Definition
- -export: specifies that a PKCS#12 file will be created.
- -in: specifies filename of the PKCS#12 file to be parsed.
- -inkey: specifies the file to read private key from.
- -out: specifies the filename to write the PKCS#12 file to.
Create a Self-Signed PFX with OpenSSL
2048 bits RSA self-signed certificate valid for 5 years:
From the openssl man page:
P7b Private Key
- req: creates and processes certificate requests.
- -new: generates a new certificate request.
- -x509: outputs a self signed certificate instead of a certificate request.
- -days: when the -x509 option is being used this specifies the number of days to certify the certificate for.
- -sha256: specifies the message digest to sign the request with.
- -nodes: private key will not be encrypted.
- -out: specifies the output filename to write to.
- -keyout: filename to write the newly created private key to.
Extract Private Key P7b
Generate a New Private Key and Certificate Signing Request (CSR)
The -newkey option creates a new certificate request and a new private key.