An SSL/TLS certificate is one of the most popular types of X.509 certificates, or a type of public key certificate which uses the X.509 standard. X.509 certificates contain a public key and the identity of a hostname, organization, or individual. Some of these certificates are self-signed.
gnutls_x509_crt_t cert. should contain a gnutls_x509_crt_t type unsigned int * key_usage. where the key usage bits will be stored unsigned int * critical. will be non-zero if the extension is marked as critical Description. This function will return certificate's key usage, by reading the keyUsage X.509 … Edit x509v3 extended key usage in existing certificate X509v3 Key Usage: Digital Signature, Non Repudiation, Key Encipherment X509v3 Stack Exchange Network Stack Exchange network consists of 177 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to … gnutls_x509_crt_set_key_usage(3) - Linux manual page gnutls_x509_crt_t crt a certificate of type gnutls_x509_crt_t unsigned int usage an ORed sequence of the GNUTLS_KEY_* elements. DESCRIPTION top This function will set the keyUsage certificate extension.
get KeyUsage extension value as binary string in the certificate This method will get key usage extension value as binary string such like '101'. Key usage bits definition is in the RFC 5280. If there is no key usage extension in the certificate, it returns empty string (i.e. '').
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Understanding Public Key Infrastructure and X.509
The Key Usage extension is described in section 4.2.1.3 of X.509, with the following possible flags:. KeyUsage ::= BIT STRING { digitalSignature (0), nonRepudiation (1), -- recent editions of X.509 have -- renamed this bit to contentCommitment keyEncipherment (2), dataEncipherment (3), keyAgreement (4), keyCertSign (5), cRLSign (6), encipherOnly (7), decipherOnly (8) } /docs/man1.1.0/man3/X509_get_key_usage.html If the key usage or extended key usage extension is absent then typically usage is unrestricted. For this reason X509_get_key_usage() and X509_get_extended_key_usage() return UINT32_MAX when the corresponding extension is absent. Applications can additionally check the return value of X509_get_extension_flags() and take appropriate action is an c - How to get key usage values from X509 cert? - Stack I need to retrieve information from x509 cert to verify Key usage. For example I need to make sure certificate can be used for digital signing (80). It can be printed out by the following code piece, but i actually want to verify if certificate has a specific property. ExtendedKeyUsage (5.61 API Documentation)