Struct x509_certificate::certificate::CapturedX509Certificate

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pub struct CapturedX509Certificate { /* private fields */ }

Expand description

Represents an immutable (read-only) X.509 certificate that was parsed from data.

This type implements Deref but not DerefMut, so only functions taking a non-mutable instance are usable.

A copy of the certificate’s raw backing data is stored, facilitating subsequent access.

Implementations§

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impl CapturedX509Certificate

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pub fn from_der(data: impl Into<Vec<u8>>) -> Result<Self, Error>

Construct an instance from DER encoded data.

A copy of this data will be stored in the instance and is guaranteed to be immutable for the lifetime of the instance. The original constructing data can be retrieved later.

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pub fn from_ber(data: impl Into<Vec<u8>>) -> Result<Self, Error>

Construct an instance from BER encoded data.

A copy of this data will be stored in the instance and is guaranteed to be immutable for the lifetime of the instance, allowing it to be retrieved later.

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pub fn from_pem(data: impl AsRef<[u8]>) -> Result<Self, Error>

Construct an instance by parsing PEM encoded ASN.1 data.

The data is a human readable string likely containing --------- BEGIN CERTIFICATE ----------.

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pub fn from_pem_multiple(data: impl AsRef<[u8]>) -> Result<Vec<Self>, Error>

Construct instances by parsing PEM with potentially multiple records.

By default, we only look for --------- BEGIN CERTIFICATE -------- entries and silently ignore unknown ones. If you would like to specify an alternate set of tags (this is the value after the BEGIN) to search, call Self::from_pem_multiple_tags.

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pub fn from_pem_multiple_tags( data: impl AsRef<[u8]>, tags: &[&str] ) -> Result<Vec<Self>, Error>

Construct instances by parsing PEM armored DER encoded certificates with specific PEM tags.

This is like Self::from_pem_multiple except you control the filter for which BEGIN <tag> values are filtered through to the DER parser.

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pub fn constructed_data(&self) -> &[u8] ⓘ

Obtain the DER data that was used to construct this instance.

The data is guaranteed to not have been modified since the instance was constructed.

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pub fn encode_pem(&self) -> String

Encode the original contents of this certificate to PEM.

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pub fn verify_signed_by_certificate( &self, other: impl AsRef<X509Certificate> ) -> Result<(), Error>

Verify that another certificate, other, signed this certificate.

If this is a self-signed certificate, you can pass self as the 2nd argument.

This function isn’t exposed on X509Certificate because the exact bytes constituting the certificate’s internals need to be consulted to verify signatures. And since this type tracks the underlying bytes, we are guaranteed to have a pristine copy.

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pub fn verify_signed_data( &self, signed_data: impl AsRef<[u8]>, signature: impl AsRef<[u8]> ) -> Result<(), Error>

Verify a signature over signed data purportedly signed by this certificate.

This is a wrapper to Self::verify_signed_data_with_algorithm() that will derive the verification algorithm from the public key type type and the signature algorithm indicated in this certificate. Typically these align. However, it is possible for a signature to be produced with a different digest algorithm from that indicated in this certificate.

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pub fn verify_signed_data_with_algorithm( &self, signed_data: impl AsRef<[u8]>, signature: impl AsRef<[u8]>, verify_algorithm: &'static dyn VerificationAlgorithm ) -> Result<(), Error>

Verify a signature over signed data using an explicit verification algorithm.

This is like Self::verify_signed_data() except the verification algorithm to use is passed in instead of derived from the default algorithm for the signing key’s type.

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pub fn verify_signed_by_public_key( &self, public_key_data: impl AsRef<[u8]> ) -> Result<(), Error>

Verifies that this certificate was cryptographically signed using raw public key data from a signing key.

This function does the low-level work of extracting the signature and verification details from the current certificate and figuring out the correct combination of cryptography settings to apply to perform signature verification.

In many cases, an X.509 certificate is signed by another certificate. And since the public key is embedded in the X.509 certificate, it is easier to go through Self::verify_signed_by_certificate instead.

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pub fn find_signing_certificate<'a>( &self, certs: impl Iterator<Item = &'a Self> ) -> Option<&'a Self>

Attempt to find the issuing certificate of this one.

Given an iterable of certificates, we find the first certificate where we are able to verify that our signature was made by their public key.

This function can yield false negatives for cases where we don’t support the signature algorithm on the incoming certificates.

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pub fn resolve_signing_chain<'a>( &self, certs: impl Iterator<Item = &'a Self> ) -> Vec<&'a Self>

Attempt to resolve the signing chain of this certificate.

Given an iterable of certificates, we recursively resolve the chain of certificates that signed this one until we are no longer able to find any more certificates in the input set.

Like Self::find_signing_certificate, this can yield false negatives (read: an incomplete chain) due to run-time failures, such as lack of support for a certificate’s signature algorithm.

As a certificate is encountered, it is removed from the set of future candidates.

The traversal ends when we get to an identical certificate (its DER data is equivalent) or we couldn’t find a certificate in the remaining set that signed the last one.

Because we need to recursively verify certificates, the incoming iterator is buffered.

Methods from Deref<Target = X509Certificate>§

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pub fn serial_number_asn1(&self) -> &Integer

Obtain the serial number as the ASN.1 Integer type.

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pub fn subject_name(&self) -> &Name

Obtain the certificate’s subject, as its ASN.1 Name type.

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pub fn subject_common_name(&self) -> Option<String>

Obtain the Common Name (CN) attribute from the certificate’s subject, if set and decodable.

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pub fn issuer_name(&self) -> &Name

Obtain the certificate’s issuer, as its ASN.1 Name type.

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pub fn issuer_common_name(&self) -> Option<String>

Obtain the Common Name (CN) attribute from the certificate’s issuer, if set and decodable.

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pub fn iter_extensions(&self) -> impl Iterator<Item = &Extension>

Iterate over extensions defined in this certificate.

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pub fn encode_der_to(&self, fh: &mut impl Write) -> Result<(), Error>

Encode the certificate data structure using DER encoding.

(This is the common ASN.1 encoding format for X.509 certificates.)

This always serializes the internal ASN.1 data structure. If you call this on a wrapper type that has retained a copy of the original data, this may emit different data than that copy.

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pub fn encode_ber_to(&self, fh: &mut impl Write) -> Result<(), Error>

Encode the certificate data structure use BER encoding.

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pub fn encode_der(&self) -> Result<Vec<u8>, Error>

Encode the internal ASN.1 data structures to DER.

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pub fn encode_ber(&self) -> Result<Vec<u8>, Error>

Obtain the BER encoded representation of this certificate.

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pub fn write_pem(&self, fh: &mut impl Write) -> Result<(), Error>

Encode the certificate to PEM.

This will write a human-readable string with ------ BEGIN CERTIFICATE ------- armoring. This is a very common method for encoding certificates.

The underlying binary data is DER encoded.

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pub fn encode_pem(&self) -> Result<String, Error>

Encode the certificate to a PEM string.

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pub fn key_algorithm(&self) -> Option<KeyAlgorithm>

Attempt to resolve a known KeyAlgorithm used by the private key associated with this certificate.

If this crate isn’t aware of the OID associated with the key algorithm, None is returned.

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pub fn key_algorithm_oid(&self) -> &Oid

Obtain the OID of the private key’s algorithm.

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pub fn signature_algorithm(&self) -> Option<SignatureAlgorithm>

Obtain the [SignatureAlgorithm this certificate will use.

Returns None if we failed to resolve an instance (probably because we don’t recognize the algorithm).

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pub fn signature_algorithm_oid(&self) -> &Oid

Obtain the OID of the signature algorithm this certificate will use.

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pub fn signature_signature_algorithm(&self) -> Option<SignatureAlgorithm>

Obtain the SignatureAlgorithm used to sign this certificate.

Returns None if we failed to resolve an instance (probably because we don’t recognize that algorithm).

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pub fn signature_signature_algorithm_oid(&self) -> &Oid

Obtain the OID of the signature algorithm used to sign this certificate.

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pub fn public_key_data(&self) -> Bytes

Obtain the raw data constituting this certificate’s public key.

A copy of the data is returned.

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pub fn rsa_public_key_data(&self) -> Result<RsaPublicKey, Error>

Attempt to parse the public key data as RsaPublicKey parameters.

Note that the raw integer value for modulus has a leading 0 byte. So its raw length will be 1 greater than key length. e.g. an RSA 2048 key will have value.modulus.as_slice().len() == 257 instead of 256.

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pub fn compare_issuer(&self, other: &Self) -> Ordering

Compare 2 instances, sorting them so the issuer comes before the issued.

This function examines the Self::issuer_name and Self::subject_name fields of 2 certificates, attempting to sort them so the issuing certificate comes before the issued certificate.

This function performs a strict compare of the ASN.1 Name data. The assumption here is that the issuing certificate’s subject Name is identical to the issued’s issuer Name. This assumption is often true. But it likely isn’t always true, so this function may not produce reliable results.

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pub fn subject_is_issuer(&self) -> bool

Whether the subject Name is also the issuer’s Name.

This might be a way of determining if a certificate is self-signed. But there can likely be false negatives due to differences in ASN.1 encoding of the underlying data. So we don’t claim this is a test for being self-signed.

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