linux-toradex.git/drivers/crypto/atmel-ecc.c, branch v5.5-rc7

crypto: atmel-ecc - factor out code that can be shared

2019-05-30T07:35:45+00:00

In preparation of adding support for the random number generator in
Atmel atsha204a devices, refactor the existing atmel-ecc driver (which
drives hardware that is closely related) so we can share the basic
I2C and command queuing routines.

Reviewed-by: Linus Walleij 
Signed-off-by: Ard Biesheuvel 
Signed-off-by: Herbert Xu

crypto: atmel-ecc - add support for ACPI probing on non-AT91 platforms

2019-05-30T07:35:45+00:00

The Atmel/Microchip EC508A is a I2C device that could be wired into
any platform, and is being used on the Linaro/96boards Secure96
mezzanine adapter. This means it could be found on any platform, even
on ones that use ACPI enumeration (via PRP0001 devices). So update the
code to enable this use case.

This involves tweaking the bus rate discovery code to take ACPI probing
into account, which records the maximum bus rate as a property of the
slave device. For the atmel-ecc code, this means that the effective bus
rate should never exceed the maximum rate, unless we are dealing with
buggy firmware. Nonetheless, let's just use the existing plumbing to
discover the bus rate and keep the existing logic intact.

Signed-off-by: Ard Biesheuvel 
Reviewed-by: Linus Walleij 
Signed-off-by: Herbert Xu

crypto: atmel - switch to SPDX license identifiers

2018-09-04T03:37:04+00:00

Adopt the SPDX license identifiers to ease license compliance
management.

Signed-off-by: Tudor Ambarus 
Signed-off-by: Herbert Xu

crypto: atmel-ecc - remove overly verbose dev_info

2018-06-22T15:03:08+00:00

Remove it because when using a slow console, it can affect
the speed of crypto operations.

Similar to 'commit 730f23b66095 ("crypto: vmx - Remove overly
verbose printk from AES XTS init")'.

Signed-off-by: Tudor Ambarus 
Signed-off-by: Herbert Xu

crypto: atmel-ecc - fix to allow multi segment scatterlists

2018-06-22T15:03:07+00:00

Remove the limitation of single element scatterlists. ECDH with
multi-element scatterlists is needed by TPM.

Similar to 'commit 95ec01ba1ef0 ("crypto: ecdh - fix to allow multi
segment scatterlists")'.

Signed-off-by: Tudor Ambarus 
Signed-off-by: Herbert Xu

crypto: atmel-ecc - fix signed integer to u8 assignment

2017-08-03T05:47:23+00:00

static checker warning:
        drivers/crypto/atmel-ecc.c:281 atmel_ecdh_done()
        warn: assigning (-22) to unsigned variable 'status'

Similar warning can be raised in atmel_ecc_work_handler()
when atmel_ecc_send_receive() returns an error. Fix this too.

Reported-by: Dan Carpenter 
Signed-off-by: Tudor Ambarus 
Signed-off-by: Herbert Xu

Crypto: atmel-ecc: Make a couple of local functions static

2017-08-03T05:47:19+00:00

Functions atmel_ecc_i2c_client_alloc and atmel_ecc_i2c_client_free are
local to the source and no not need to be in the global scope. Make
them static.

Cleans up sparse warnings:
symbol 'atmel_ecc_i2c_client_alloc' was not declared. Should it be static?
symbol 'atmel_ecc_i2c_client_free' was not declared. Should it be static?

Signed-off-by: Colin Ian King 
Acked-by: Tudor Ambarus 
Signed-off-by: Herbert Xu

crypto: atmel-ecc - introduce Microchip / Atmel ECC driver

2017-07-18T09:50:58+00:00

Add ECDH support for ATECC508A (I2C) device.

The device features hardware acceleration for the NIST standard
P256 prime curve and supports the complete key life cycle from
private key generation to ECDH key agreement.

Random private key generation is supported internally within
the device to ensure that the private key can never be known
outside of the device. If the user wants to use its own private
keys, the driver will fallback to the ecdh software implementation.

Signed-off-by: Tudor Ambarus 
Signed-off-by: Herbert Xu