rama::crypto::dep::x509_parser::prelude

Trait FromDer

pub trait FromDer<'a, E = Error>: Sized {
    // Required method
    fn from_der(bytes: &'a [u8]) -> Result<(&'a [u8], Self), Err<E>>;
}

Expand description

Base trait for DER object parsers

Library authors should usually not directly implement this trait, but should prefer implementing the TryFrom<Any> + CheckDerConstraints traits, which offers greater flexibility and provides an equivalent FromDer implementation for free (in fact, it provides both FromBer and FromDer).

Note: if you already implemented TryFrom<Any> and CheckDerConstraints, you can get a free FromDer implementation by implementing the DerAutoDerive trait. This is not automatic, so it is also possible to manually implement FromDer if preferred.

§Examples

use asn1_rs::{Any, CheckDerConstraints, DerAutoDerive, Result, Tag};
use std::convert::TryFrom;

// The type to be decoded
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct MyType(pub u32);

impl<'a> TryFrom<Any<'a>> for MyType {
    type Error = asn1_rs::Error;

    fn try_from(any: Any<'a>) -> Result<MyType> {
        any.tag().assert_eq(Tag::Integer)?;
        // for this fictive example, the type contains the number of characters
        let n = any.data.len() as u32;
        Ok(MyType(n))
    }
}

impl CheckDerConstraints for MyType {
    fn check_constraints(any: &Any) -> Result<()> {
        any.header.assert_primitive()?;
        Ok(())
    }
}

impl DerAutoDerive for MyType {}

// The above code provides a `FromDer` implementation for free.

// Example of parsing code:
use asn1_rs::FromDer;

let input = &[2, 1, 2];
// Objects can be parsed using `from_der`, which returns the remaining bytes
// and the parsed object:
let (rem, my_type) = MyType::from_der(input).expect("parsing failed");

Required Methods§

fn from_der(bytes: &'a [u8]) -> Result<(&'a [u8], Self), Err<E>>

Attempt to parse input bytes into a DER object (enforcing constraints)

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§

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impl<'a> FromDer<'a, X509Error> for X509CertificationRequest<'a>

CertificationRequest ::= SEQUENCE {
    certificationRequestInfo CertificationRequestInfo,
    signatureAlgorithm AlgorithmIdentifier{{ SignatureAlgorithms }},
    signature          BIT STRING
}

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impl<'a> FromDer<'a, X509Error> for X509CertificationRequestInfo<'a>

CertificationRequestInfo ::= SEQUENCE {
     version       INTEGER { v1(0) } (v1,...),
     subject       Name,
     subjectPKInfo SubjectPublicKeyInfo{{ PKInfoAlgorithms }},
     attributes    [0] Attributes{{ CRIAttributes }}
}

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impl<'a> FromDer<'a, X509Error> for ExtensionRequest<'a>

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impl<'a> FromDer<'a, X509Error> for X509CriAttribute<'a>

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impl<'a> FromDer<'a, X509Error> for AuthorityInfoAccess<'a>

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impl<'a> FromDer<'a, X509Error> for AuthorityKeyIdentifier<'a>

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impl<'a> FromDer<'a, X509Error> for BasicConstraints

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impl<'a> FromDer<'a, X509Error> for CRLDistributionPoints<'a>

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impl<'a> FromDer<'a, X509Error> for ExtendedKeyUsage<'a>

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impl<'a> FromDer<'a, X509Error> for InhibitAnyPolicy

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impl<'a> FromDer<'a, X509Error> for IssuerAlternativeName<'a>

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impl<'a> FromDer<'a, X509Error> for KeyIdentifier<'a>

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impl<'a> FromDer<'a, X509Error> for KeyUsage

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impl<'a> FromDer<'a, X509Error> for NSCertType

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impl<'a> FromDer<'a, X509Error> for NameConstraints<'a>

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impl<'a> FromDer<'a, X509Error> for PolicyConstraints

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impl<'a> FromDer<'a, X509Error> for PolicyMappings<'a>

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impl<'a> FromDer<'a, X509Error> for SubjectAlternativeName<'a>

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impl<'a> FromDer<'a, X509Error> for SubjectInfoAccess<'a>

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impl<'a> FromDer<'a, X509Error> for X509Extension<'a>

Extension  ::=  SEQUENCE  {
    extnID      OBJECT IDENTIFIER,
    critical    BOOLEAN DEFAULT FALSE,
    extnValue   OCTET STRING  }

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impl<'a> FromDer<'a, X509Error> for RSAPublicKey<'a>

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impl<'a> FromDer<'a, X509Error> for AttributeTypeAndValue<'a>

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impl<'a> FromDer<'a, X509Error> for CertificateRevocationList<'a>

CertificateList  ::=  SEQUENCE  {
     tbsCertList          TBSCertList,
     signatureAlgorithm   AlgorithmIdentifier,
     signatureValue       BIT STRING  }

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impl<'a> FromDer<'a, X509Error> for RelativeDistinguishedName<'a>

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impl<'a> FromDer<'a, X509Error> for RevokedCertificate<'a>

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impl<'a> FromDer<'a, X509Error> for SubjectPublicKeyInfo<'a>

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impl<'a> FromDer<'a, X509Error> for TbsCertList<'a>

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impl<'a> FromDer<'a, X509Error> for X509Name<'a>

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impl<'a> FromDer<'a, X509Error> for X509Version

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