diff options
Diffstat (limited to 'openpgp/src/packet/user_attribute.rs')
-rw-r--r-- | openpgp/src/packet/user_attribute.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/openpgp/src/packet/user_attribute.rs b/openpgp/src/packet/user_attribute.rs index 851e3126..57d93e82 100644 --- a/openpgp/src/packet/user_attribute.rs +++ b/openpgp/src/packet/user_attribute.rs @@ -20,6 +20,7 @@ use crate::packet::{ header::BodyLength, }; use crate::Packet; +use crate::policy::HashAlgoSecurity; use crate::serialize::Marshal; use crate::serialize::MarshalInto; @@ -74,6 +75,35 @@ impl UserAttribute { }) } + /// The security requirements of the hash algorithm for + /// self-signatures. + /// + /// A cryptographic hash algorithm usually has [three security + /// properties]: pre-image resistance, second pre-image + /// resistance, and collision resistance. If an attacker can + /// influence the signed data, then the hash algorithm needs to + /// have both second pre-image resistance, and collision + /// resistance. If not, second pre-image resistance is + /// sufficient. + /// + /// [three security properties]: https://en.wikipedia.org/wiki/Cryptographic_hash_function#Properties + /// + /// In general, an attacker may be able to influence third-party + /// signatures. But direct key signatures, and binding signatures + /// are only over data fully determined by signer. And, an + /// attacker's control over self signatures over User IDs is + /// limited due to their structure. + /// + /// These observations can be used to extend the life of a hash + /// algorithm after its collision resistance has been partially + /// compromised, but not completely broken. For more details, + /// please refer to the documentation for [HashAlgoSecurity]. + /// + /// [HashAlgoSecurity]: ../policy/enum.HashAlgoSecurity.html + pub fn hash_algo_security(&self) -> HashAlgoSecurity { + HashAlgoSecurity::CollisionResistance + } + /// Gets the user attribute packet's raw, unparsed value. /// /// Most likely you will want to use [`subpackets()`] to iterate |