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HmacSecret

cratestack::cose

Struct HmacSecret 

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pub struct HmacSecret(/* private fields */);
Expand description

An HMAC secret of at least MIN_HMAC_SECRET_LEN bytes.

The secret must be uniformly random (from a CSPRNG or a KMS), not a password or anything derived from a guessable value. Length alone does not make it safe: every COSE_Mac0 message publishes the secret’s kid, the first 64 bits of SHA-256 over a fixed encoding of the secret, so an attacker can test candidate secrets offline against any captured message at hashing speed, without a single online attempt. A 32-byte random secret makes that search hopeless; a 32-character passphrase does not.

Debug does not print it, == compares in constant time, and the bytes are wiped when the value is dropped (best effort: copies the caller made before handing the secret over, or a Vec that reallocated on its way here, are outside this type’s reach).

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impl HmacSecret

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pub fn new(secret: impl Into<Vec<u8>>) -> Result<HmacSecret, CratestackError>

Take ownership of secret. Fails with CratestackError::Validation below MIN_HMAC_SECRET_LEN bytes; see the type’s docs for why the bytes must also be random.

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impl Clone for HmacSecret

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fn clone(&self) -> HmacSecret

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

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

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

Formats the value using the given formatter. Read more
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impl Eq for HmacSecret

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impl PartialEq for HmacSecret

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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