PKCS10

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File Format
Name PKCS10
Ontology
Extension(s) .csr, .pem, .p10
MIME Type(s) application/pkcs10

PKCS #10 (PKCS10) is the most common Certificate Signing Request (CSR) format. The term CSR often implies PKCS10 format, though other CSR formats exist.

A PKCS10 file may be encoded in PEM format, DER format, or possibly some other format.

Contents

Identification

A PEM-encoded PKCS10 file is plain text, with base64-encoded payload data. It contains a line that reads "-----BEGIN CERTIFICATE REQUEST-----" or "-----BEGIN NEW CERTIFICATE REQUEST-----".

Examples

To view the contents of a PEM-encoded PKCS10 file, using OpenSSL:

 openssl req -noout -text -in example.csr

To generate a new PKCS10 file, first generate a private key, then:

 openssl req -new -key example.key -out example.csr

Specifications

  • RFC 2986: PKCS #10: Certification Request Syntax Specification, Version 1.7
  • RFC 2314: PKCS #10, Version 1.5 (obsolete)
  • RFC 5967: The application/pkcs10 Media Type

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