c2pa_crypto::cose

Enum TimeStampStorage

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pub enum TimeStampStorage {
    V1_sigTst,
    V2_sigTst2_CTT,
}
Expand description

The TimeStampStorage parameter defines how RFC 3161 time stamps are to be stored in a COSE signature.

This is as defined in §10.3.2.5.4, Storing the time-stamp, of version 2.1 of the C2PA Technical Specification.

Variants§

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V1_sigTst

v1 time-stamps (deprecated) are stored in a COSE unprotected header whose label is the string sigTst. If present, the value of this header shall be a tstContainer defined by Example 2, “CDDL for tstContainer”. The content of the TimeStampResp structure received in reply from the TSA shall be stored as the value of the val property of an element of tstTokens`.

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V2_sigTst2_CTT

v2 time-stamps shall be stored in a COSE unprotected header whose label is the string sigTst2. When present, the value of this header shall be a tstContainer defined by Example 2, “CDDL for tstContainer”. The content of value of the timeStampToken field of the TimeStampResp structure received in reply from the TSA shall be stored as the value of the val property of an element of tstTokens.

NOTE: A v2 time-stamp is equivalent to the “CTT” model of COSE Header parameter for RFC 3161 Time-Stamp Tokens Draft. It requires that the complete signature structure be completed prior to time-stamping, thus enabling the time-stamp to serve as a countersignature on the entire signature structure, including the actual certificate.

Trait Implementations§

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impl Clone for TimeStampStorage

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fn clone(&self) -> TimeStampStorage

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for TimeStampStorage

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

Formats the value using the given formatter. Read more
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impl PartialEq for TimeStampStorage

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fn eq(&self, other: &TimeStampStorage) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for TimeStampStorage

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impl Eq for TimeStampStorage

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impl StructuralPartialEq for TimeStampStorage

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