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fix description of MAC calculation

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This commit is contained in:
Hubert Chathi 2023-06-27 16:28:52 -04:00
parent f4aa7c0327
commit a248c89fb7
1 changed files with 5 additions and 1 deletions
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6
content/client-server-api/modules/end_to_end_encryption.md
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@ -777,7 +777,7 @@ The method used to calculate these MACs depends upon the value of the
message. All current implementations should use the `hkdf-hmac-sha256.v2` method which is
defined as follows:
The MAC used is HMAC as defined in [RFC
An HMAC key is generated using HKDF, as defined in [RFC
5869](https://tools.ietf.org/html/rfc5869), using SHA-256 as the hash
function. The shared secret is supplied as the input keying material. No salt
is used, and in the info parameter is the concatenation of:
@ -791,6 +791,10 @@ is used, and in the info parameter is the concatenation of:
- The Key ID of the key being MAC-ed, or the string `KEY_IDS` if the
item being MAC-ed is the list of key IDs.
A MAC is then generated using HMAC as defined in [RFC
2104](https://tools.ietf.org/html/rfc2104) with the key generated above and
using SHA-256 as the hash function.
If a key is being MACed, the MAC is performed on the public key as encoded
according to the [key algorithm](#key-algorithms). For example, for `ed25519`
keys, it is the unpadded base64-encoded key.