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auth: Add a disclaimer around the argon hash
Some people initially thought that the fixed salt was a security flaw. This comment clarifies the role of the Argon hash and justifies the fixed salt.
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@ -15,6 +15,11 @@ pub type KeyPair = opaque_ke::keypair::KeyPair<<DefaultSuite as CipherSuite>::Gr
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/// A wrapper around argon2 to provide the [`opaque_ke::slow_hash::SlowHash`] trait.
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pub struct ArgonHasher;
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/// The Argon hasher used for bruteforce protection.
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///
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/// Note that it isn't used to "hash the passwords", so it doesn't need a variable salt. Instead,
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/// it's used as part of the OPAQUE protocol to add a slow hashing method, making bruteforce
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/// attacks prohibitively more expensive.
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impl ArgonHasher {
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/// Fixed salt, doesn't affect the security. It is only used to make attacks more
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/// computationally intensive, it doesn't serve any security purpose.
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