gnutls_x509_crt_get_key_usage(3) - Linux manual page
The 'jsrsasign' (RSA-Sign JavaScript Library) is an opensource free cryptography library supporting RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, OCSP, CMS SignedData, TimeStamp, CAdES JSON Web Signature/Token in pure JavaScript. - … Creating OpenSSL x509 certificates - Adfinis.com Jun 29, 2017 #SecureSenses --remediation, not coping: x.509
RFC 3280 Internet X.509 Public Key Infrastructure April 2002 id-ce-subjectKeyIdentifier OBJECT IDENTIFIER ::= { id-ce 14 } SubjectKeyIdentifier ::= KeyIdentifier 4.2.1.3 Key Usage The key usage extension defines the purpose (e.g., encipherment, signature, certificate signing) of the key contained in the certificate. The usage restriction might
Note that the use of this bit is extremely uncommon; almost all applications use key transport or key agreement to establish a symmetric key. The keyAgreement bit is asserted when the subject public key is used for key agreement. For example, when a Diffie-Hellman key is to be used for key …
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
The X.509 Certificate and CRL profile presented in RFC 3280 specifies the extended key usage extension for defining purposes for which the subject's public key may be used. These purposes may be specified in addition to those of the KeyUsage extension, or in place of those. KeyUsage (5.61 API Documentation) Likewise, when a RSA key should be used only for key management, the keyEncipherment bit would be asserted. More information can be found in RFC 3280, section 4.2.1.3 "Key Usage". For adding a KeyUsage extension object to a X509Certificate, use the addExtension method of the iaik.x509.X509Certificate class, e.g.: X509EnhancedKeyUsageExtension Class (System.Security An enhanced key usage (EKU) extension is a collection of object identifiers (OIDs) that indicate the applications that use the key. Constructors X509EnhancedKeyUsageExtension() Initializes a new instance of the X509EnhancedKeyUsageExtension class. X509EnhancedKeyUsageExtension(AsnEncodedData, Boolean) X.509 Reference — Cryptography 3.1.dev1 documentation The key usage extension defines the purpose of the key contained in the certificate. The usage restriction might be employed when a key that could be used for more than one operation is to be restricted. oid Returns EXTENDED_KEY_USAGE. class cryptography.x509.