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Add note for versionMac calculation details #84

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Jun 11, 2025
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Add note for versionMac calculation details #84

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4 changes: 4 additions & 0 deletions docs/security/architecture.md
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@@ -139,6 +139,10 @@ The wrapped keys and the parameters needed to derive the KEK are then stored as
}
```

:::note
When calculating the `versionMac`, the `version` value must be converted to a 32-bit unsigned integer and then encoded as a 4-byte big-endian representation before computing the HMAC-SHA256, regardless of the system's native byte order.
:::

When unlocking a vault the KEK is used to unwrap (i.e. decrypt) the stored masterkeys.

<WhiteBox>