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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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Dave Rodgman 2021-06-30 19:00:48 +01:00
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docs/3.0-migration-guide.md
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@ -252,7 +252,7 @@ Applications using one-shot GCM or using GCM via the `mbedtls_cipher_xxx` or `ps
### GCM interface changes: impact for alternative implementations
The GCM multipart interface has changed as described in [“GCM multipart interface: application changes”](#gcm-multipart-interface:-application-changes). The consequences for an alternative implementation of GCM (`MBEDTLS_GCM_ALT`) are as follows:
The GCM multipart interface has changed as described in [“GCM multipart interface: application changes”](#gcm-multipart-interface-application-changes). The consequences for an alternative implementation of GCM (`MBEDTLS_GCM_ALT`) are as follows:
* `mbedtls_gcm_starts()` now only sets the mode and the nonce (IV). The new function `mbedtls_gcm_update_ad()` receives the associated data. It may be called multiple times.
* `mbedtls_gcm_update()` now allows arbitrary-length inputs, takes an extra parameter to indicate the actual output length. Alternative implementations may choose between two modes: