[−][src]Crate x509_signature
A low-level X.509 parsing and certificate signature verification library.
x509-signature can verify the signatures of X.509 certificates, as well as certificates made by their private keys. It can also verify that a certificate is valid for the given time. However, it is (by design) very low-level: it does not know about any X.509 extensions, and does not parse distinguished names at all. It also provides no path-building facilities. As such, it is not intended for use with the web PKI; use webpki for that.
x509-signature’s flexibiity is a double-edged sword: it allows it to be used in situations where webpki cannot be used, but it also makes it significantly more dangerous. As a general rule, x509-signature will accept any certificate that webpki will, but it will also accept certificates that webpki will reject. If you find a certificate that x509-signature rejects and webpki rejects, please report it as a bug.
x509-signature was developed for use with
libp2p, which uses certificates that webpki
cannot handle. Its bare-bones design ensures that it can handle almost any
conforming X.509 certificate, but it also means that the application is
responsible for ensuring that the certificate has valid X.509 extensions.
x509-signature cannot distinguish between a certificate valid for
mozilla.org
and one for evilmalware.com
! However, x509-signature
does provide the hooks needed for higher-level libraries to be built on top
of it.
Like webpki, x509-signature is zero-copy and #![no_std]
friendly. If
built without the alloc
feature, x509-signature will not rely on features
of ring that require heap allocation, specifically RSA. x509-signature
should never panic on any input.
Structs
ASN1Time | An ASN.1 timestamp. |
DataAlgorithmSignature | A data-algorithm-signature structure |
ExtensionIterator | An iterator over X.509 extensions. |
SequenceIterator | An iterator over X.509 sequences. |
SubjectPublicKeyInfo | A PKIX SubjectPublicKeyInfo struct |
X509Certificate | A parsed (but not validated) X.509 version 3 certificate. |
Enums
Error | Errors that can be produced when parsing a certificate or validating a signature. |
Restrictions | Restrictions on allowed signature algorithms |
SignatureScheme | A signature scheme supported by this library |
Constants
MAX_ASN1_TIMESTAMP | The largest timestamp that an ASN.1 GeneralizedTime can represent. |
MIN_ASN1_TIMESTAMP | The smallest timestamp that an ASN.1 GeneralizedTime can represent. |
Functions
days_from_ymd | We use our own version, instead of chrono, because: |
parse_algorithmid | Parse the ASN.1 DER-encoded algorithm identifier in |
parse_certificate | Extracts the algorithm id and public key from a certificate |
seconds_from_hms | Convert an (hour, minute, second) tuple to a number of seconds since midnight or an error. |