Enable scratch encryption and increase swap RAM buffer #10
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These are two experimental features that might need some additional work in future.
mcuboot.encrypt-scratch: true -> enables scratch encryption
During a swap when movig data from slot 1 to scratch data is decrypted taking care of slot 1 offsets. This is the default MCUboot behaviour. This features enables re-encryption of this data before writing it into scratch and decryption before writing scratch data into slot 0.
mcuboot.swap-buf-size: 131072 -> swap buffer size
During a swap data is normally readed from flash and store into a 1K buffer to encrypt/decrypt and moving the data. Increasing the size of the buffer improves swap time. Swapping 1MB of data with 1KB buffer takes 5' using 128KB buffer takes 3'2''