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13996927cb
TLS 1.3 record protection allows the addition of an arbitrary amount of padding. This commit introduces a configuration option ``` MBEDTLS_SSL_TLS13_PADDING_GRANULARITY ``` The semantics of this option is that padding is chosen in a minimal way so that the padded plaintext has a length which is a multiple of MBEDTLS_SSL_TLS13_PADDING_GRANULARITY. For example, setting MBEDTLS_SSL_TLS13_PADDING_GRANULARITY to 1024 means that padded plaintexts will have length 1024, 2048, ..., while setting it to 1 means that no padding will be used. Signed-off-by: Hanno Becker <hanno.becker@arm.com>