Struct DecodeResult 

#[non_exhaustive]
pub struct DecodeResult {
    pub claim169: Claim169,
    pub cwt_meta: CwtMeta,
    pub verification_status: VerificationStatus,
    pub x509_headers: X509Headers,
    pub detected_compression: DetectedCompression,
    pub warnings: Vec<Warning>,
    pub key_id: Option<Vec<u8>>,
    pub algorithm: Option<Algorithm>,
}

Result of successfully decoding a Claim 169 QR code.

This struct contains all the data extracted from the QR code:

• The identity data (Claim169)
• CWT metadata like issuer and expiration (CwtMeta)
• The signature verification status
• Any warnings generated during decoding

Example

let result = Decoder::new(qr_content)
    .verify_with_ed25519(&public_key)?
    .decode()?;

// Access identity data
if let Some(name) = &result.claim169.full_name {
    println!("Welcome, {}!", name);
}

// Check verification status
match result.verification_status {
    VerificationStatus::Verified => println!("Signature verified"),
    VerificationStatus::Skipped => println!("Verification skipped"),
    VerificationStatus::Failed => println!("Verification failed"),
}

// Check for warnings
for warning in &result.warnings {
    println!("Warning: {}", warning.message);
}

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

claim169: Claim169

The extracted Claim 169 identity data.

Contains demographic information (name, date of birth, address, etc.) and optionally biometric data (fingerprints, iris scans, face images).

cwt_meta: CwtMeta

CWT (CBOR Web Token) metadata.

Contains standard claims like issuer, subject, expiration time, and issued-at timestamp.

verification_status: VerificationStatus

Signature verification status.

• Verified: Signature was checked and is valid
• Skipped: No verifier was provided (only if allow_unverified was set)
• Failed: Signature verification failed (this typically returns an error instead)

x509_headers: X509Headers

X.509 certificate headers from the COSE structure.

Contains any X.509 certificate information present in the COSE protected/unprotected headers (x5bag, x5chain, x5t, x5u).

detected_compression: DetectedCompression

The compression format detected during decoding.

Indicates which compression format was auto-detected and used: Zlib (spec-compliant), Brotli (non-standard), or None (raw).

warnings: Vec<Warning>

Warnings generated during decoding.

Non-fatal issues that don’t prevent decoding but may warrant attention, such as unknown fields (forward compatibility) or skipped validations.

key_id: Option<Vec<u8>>

Key ID from the COSE protected header, if present.

Useful for identifying which key was used for signing in multi-issuer or key-rotation scenarios.

algorithm: Option<Algorithm>

COSE algorithm used for signing or encryption.

Reflects the algorithm declared in the COSE protected header (e.g., EdDSA, ES256).

Trait Implementations

impl Debug for DecodeResult

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.