p12) openssl pkcs12 -info -in keyStore.p12 Check a certificate openssl x509 -in certificate.crt -text -noout.Check a private key openssl rsa -in privateKey.key -check.Check a CSR openssl req -text -noout -verify -in CSR.csr.Our online Tools LINK can also be used for this purpose. Use the following commands to check the information of a certificate, CSR or private key. Remove a password from a private key openssl rsa -in privateKey.pem -out newPrivateKey.pemĬheck the CSR, Private Key or Certificate using OpenSSL.Generate a self-signed certificate openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.key -out certificate.crt.Generate a CSR based on an existing certificate openssl x509 -x509toreq -in MYCRT.crt -out CSR.csr -signkey privateKey.key.Generate a CSR for an existing private key openssl req -out CSR.csr -key privateKey.key -new.Generate a new private key and CSR (Windows) openssl req -out CSR.csr -pubkey -new -keyout privateKey.key -config.Generate a new private key and CSR (Unix) openssl req -utf8 -nodes -sha256 -newkey rsa:2048 -keyout server.key -out server.csr openssl req -out CSR.csr -pubkey -new -keyout privateKey.key.i.The following commands show how to create CSRs, certificates and private keys, in addition to a few other tasks using OpenSSL. If the certificate and the key file are matching, you should get the modulus as same as certificate modulus above. Openssl rsa -noout -modulus -in myserver.key | openssl md5 Please follow the below command to view the modulus of the private key. Now you will receive the modulus something like a77c7953ea5283056a0c9ad75b274b96 Openssl x509 -noout -modulus -in server.crt | openssl md5 Please follow the below command to view the modulus of the certificate. To verify that a private key matches its certificate you need to compare the modulus of the certificate against the modulus of the private key. How do I verify that a private key matches a certificate Subject: C=DE, ST=Berlin, L=Berlin, O = my-company, OU = IT DEP, CN = my. Issuer: C=US, O=Symantec Corporation, OU=Symantec Trust Network, CN=Symantec Class 3 Secure Server CA - G4 Subject: C=US, O=Symantec Corporation, OU=Symantec Trust Network, CN=Symantec Class 3 Secure Server CA - G4 For authorized use only, CN=VeriSign Class 3 Public Primary Certification Authority - G5 Issuer: C=US, O=VeriSign, Inc., OU=VeriSign Trust Network, OU=(c) 2006 VeriSign, Inc. In order for the CA chain validation to succeed the result should be so that the Subject: line of the first(CA Bundle) should match the Issuer: line of the second(web certificate) Openssl x509 -in $file -noout -text | egrep 'Issuer:|Subject:' # Displays the issuers and Subject of each certificate file Openssl verify -verbose -purpose sslserver -CAfile ĬA_Chain_check.sh Symantec_CA_G4_Bundle.pem my. One possibility is to use the openssl ‘verify’ command as follows: I:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root Verifying the certificate chain using certificate files only(no web request)Ĭommands using openssl and the certificate & CA files locally can also be used to verify the certificate chain. The idea to have a full valid certificate chain, is to have the Issuer( i:) line of a certificate the same as the Subject( s:) line of the depth below, and the last (root certificate) has both Issuer and Subject lies the same. I:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA RootĢ s:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA RootĪs seen in the above chain check result, each certificate in the chain involved has an Issuer( i:) line and a Subject( s:) line. I:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2ġ s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2 Result:(most important extract from full result)ĭepth=2 C = SE, O = AddTrust AB, OU = AddTrust External TTP Network, CN = AddTrust External CA Rootĭepth=1 C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = PositiveSSL CA 2ĭepth=0 OU = Domain Control Validated, OU = PositiveSSL Wildcard, CN = *.Ġ s:/OU=Domain Control Validated/OU=PositiveSSL Wildcard/CN=*. In order to see if an SSL web site has the proper SSL Certificate chain, this simple command can help:Įcho "" | openssl s_client -showcerts -servername -connect :443 -CApath /etc/ssl/certs/Įcho " " | openssl s_client -showcerts -servername -connect :443 -CApath /etc/ssl/certs
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