Struct x509_parser::extensions::X509Extension [−][src]
pub struct X509Extension<'a> { pub oid: Oid<'a>, pub critical: bool, pub value: &'a [u8], // some fields omitted }
Expand description
X.509 version 3 extension
X.509 extensions allow adding attributes to objects like certificates or revocation lists.
Each extension in a certificate is designated as either critical or non-critical. A certificate using system MUST reject the certificate if it encounters a critical extension it does not recognize; however, a non-critical extension MAY be ignored if it is not recognized.
Each extension includes an OID and an ASN.1 structure. When an extension appears in a certificate, the OID appears as the field extnID and the corresponding ASN.1 encoded structure is the value of the octet string extnValue. A certificate MUST NOT include more than one instance of a particular extension.
When parsing an extension, the global extension structure (described above) is parsed,
and the object is returned if it succeeds.
During this step, it also attempts to parse the content of the extension, if known.
The returned object has a
X509Extension::parsed_extension()
method. The returned
enum is either a known extension, or the special value ParsedExtension::UnsupportedExtension
.
Example
use x509_parser::extensions::{X509Extension, ParsedExtension}; use x509_parser::traits::FromDer; static DER: &[u8] = &[ 0x30, 0x1D, 0x06, 0x03, 0x55, 0x1D, 0x0E, 0x04, 0x16, 0x04, 0x14, 0xA3, 0x05, 0x2F, 0x18, 0x60, 0x50, 0xC2, 0x89, 0x0A, 0xDD, 0x2B, 0x21, 0x4F, 0xFF, 0x8E, 0x4E, 0xA8, 0x30, 0x31, 0x36 ]; let res = X509Extension::from_der(DER); match res { Ok((_rem, ext)) => { println!("Extension OID: {}", ext.oid); println!(" Critical: {}", ext.critical); let parsed_ext = ext.parsed_extension(); assert!(!parsed_ext.unsupported()); assert!(parsed_ext.error().is_none()); if let ParsedExtension::SubjectKeyIdentifier(key_id) = parsed_ext { assert!(key_id.0.len() > 0); } else { panic!("Extension has wrong type"); } }, _ => panic!("x509 extension parsing failed: {:?}", res), }
Fields
oid: Oid<'a>
OID describing the extension content
critical: bool
Boolean value describing the ‘critical’ attribute of the extension
An extension includes the boolean critical, with a default value of FALSE.
value: &'a [u8]
Raw content of the extension
Implementations
pub const fn new(
oid: Oid<'a>,
critical: bool,
value: &'a [u8],
parsed_extension: ParsedExtension<'a>
) -> X509Extension<'a>
pub const fn new(
oid: Oid<'a>,
critical: bool,
value: &'a [u8],
parsed_extension: ParsedExtension<'a>
) -> X509Extension<'a>
Creates a new extension with the provided values.
Return the extension type or UnsupportedExtension
if the extension is not implemented.
Trait Implementations
Extension ::= SEQUENCE { extnID OBJECT IDENTIFIER, critical BOOLEAN DEFAULT FALSE, extnValue OCTET STRING }
A parser takes in input type, and returns a Result
containing
either the remaining input and the output value, or an error Read more
Maps a function over the result of a parser
Creates a second parser from the output of the first one, then apply over the rest of the input
Applies a second parser over the output of the first one
Applies a second parser after the first one, return their results as a tuple
Applies a second parser over the input if the first one failed
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
Auto Trait Implementations
impl<'a> RefUnwindSafe for X509Extension<'a>
impl<'a> Send for X509Extension<'a>
impl<'a> Sync for X509Extension<'a>
impl<'a> Unpin for X509Extension<'a>
impl<'a> UnwindSafe for X509Extension<'a>
Blanket Implementations
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