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6cb9f35d8c
In internal `get_padding` functions, report whether the padding was invalid through a separate output parameter, rather than the return code. Take advantage of this to have `mbedtls_cipher_finish_padded()` be the easy path that just passes the `invalid_padding` through. Make `mbedtls_cipher_finish()` a wrapper around `mbedtls_cipher_finish_padded()` that converts the invalid-padding output into an error code. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>