This is just a representation choice for presentation purposes. With this tool we can get certificates formated in different ways, which will be ready to be used in the OneLogin SAML Toolkits. When doing a ocsp test using openssl it sends the serial number as a hex string which cfssl can't find in the database when using ocspserve. Select the date cells, and right click to display context menu, select Format Cells. Issuer Name: Name of the issuer of the certificate. For a integer ( in decimal or hex, or anyother base ), DER encoding have a negative serial number, we treat it as positive integer and convert it to The bn strng is written in xml signature as certificate serial number. Brian Proposed as answer by Brian Komar [MVP] Tuesday, October 18, 2016 5:12 AM I need to get serial number of x509 certificate. In the Format Cells dialog, under Number tab, select General from the Category list. Text Function│Data Formatting. Click OK. Sometimes we copy and paste the X.509 certificates from documents and files, and the format is lost. Serial Number: 41:d7:4b:97:ae:4f:3e:d2:5b:85:06:99:51:a7:b0:62 The certificates I create using openssl command line always look like the first one. When a certificate is created by cfssl it stores the serial number as a Decimal entry while the serial number is stored as hex in the cert it self. Not Before: Date before which the certificate is not valid. Option #3: OpenSSL. It generates certificate signing request (CSR) and private key Save both files in a safe place on different certs, on some I get a serial number which looks like this. certificate serial number hex to decimal converter. In cryptography, X.509 is a standard defining the format of public key certificates. 1. Serial Number: Serial number of the certificate. Note: The thumbprint of a certificate in Mozilla is considered the SHA1 Fingerprint. To convert date to serial number, you can change the cell format to general. SSL Certificate Decoder What it does? It is therefore piped to cut -d'=' -f2 which splits the output on the equal sign and outputs the second part - 0123456709AB . Not After: Date after which the certificate is not valid. 2. The result of usage "certificate.getSerialNumber()" differs from the expected. Format a X.509 certificate. Dates are stored as serial numbers in Excel and they can be switched from one format to another. openssl x509 -noout -serial -in cert.pem will output the serial number of the certificate, but in the format serial=0123456709AB. You will still need to separate the Private Key (.PVK) and certificate (.DER) files, but serial number format is now irrelevant. Algorithm Identifier: Signature algorithm used by the certificate signer. Inside here you will find the data that you need. Serial Number: 256 (0x100) On others, I get one which looks like this. 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