Verify that a private key matches a certificate - Revision history

Ppapa at 04:42, 12 February 2024

2024-02-12T04:42:38Z

Ppapa at 04:42, 12 February 2024

2024-02-12T04:42:26Z

Ppapa: Created page with "To verify that an RSA private key matches the RSA public key in a certificate you need to i) verify the consistency of the private key and ii) compare the modulus of the publi..."

2024-02-12T04:41:41Z

Created page with "To verify that an RSA private key matches the RSA public key in a certificate you need to i) verify the consistency of the private key and ii) compare the modulus of the publi..."

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To verify that an RSA private key matches the RSA public key in a certificate you need to i) verify the consistency of the private key and ii) compare the modulus of the public key in the certificate against the modulus of the private key.

To verify the consistency of the RSA private key and to view its modulus:
openssl rsa -modulus -noout -in myserver.key | openssl md5

openssl rsa -check -noout -in myserver.key
RSA Key is ok
If it doesn't say 'RSA key ok', it isn't OK!"

To view the modulus of the RSA public key in a certificate:
openssl x509 -modulus -noout -in myserver.crt | openssl md5

If the first commands shows any errors, or if the modulus of the public key in the certificate and the modulus of the private key do not exactly match, then you're not using the correct private key. You can either create a brand new key and CSR and contact support, or you can do a search for any other private keys on the system and see if they match.

@@ Line 3: / Line 3: @@
 To verify the consistency of the RSA private key and to view its modulus:
    openssl rsa -modulus -noout -in ''my.key'' | openssl md5
-−
    openssl rsa -check -noout -in ''my.key''
    RSA Key is ok

@@ Line 2: / Line 2: @@
 To verify the consistency of the RSA private key and to view its modulus:
-   openssl rsa -modulus -noout -in myserver.key | openssl md5
+   openssl rsa -modulus -noout -in ''my.key'' | openssl md5
-   openssl rsa -check -noout -in myserver.key
+   openssl rsa -check -noout -in ''my.key''
    RSA Key is ok
 If it doesn't say 'RSA key ok', it isn't OK!"
 To view the modulus of the RSA public key in a certificate:
-   openssl x509 -modulus -noout -in myserver.crt | openssl md5
+   openssl x509 -modulus -noout -in ''my.crt'' | openssl md5
 If the first commands shows any errors, or if the modulus of the public key in the certificate and the modulus of the private key do not exactly match, then you're not using the correct private key. You can either create a brand new key and CSR and contact support, or you can do a search for any other private keys on the system and see if they match.