crypto: digest: initialize earlier ...

Digests have dependencies and are needed for state which initializes
at device_initcall level. To make sure the digests are available
for state register them earlier, at coredevice_initcall level.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: add digest_alloc_by_algo() ...

In barebox the function digest_alloc() allocates a digest based on a string.
When a subsystem already uses an integer value to identify a digest it makes no
sense to create a string and pass it to digest_alloc(), where it is parsed
again. This patch adds the possibility to get a digest by an enum.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: sha512: switch to linux implementation ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: hmac: move register to hmac ...

As we will use the best sha algo at runtime

Add a new init level crypto_initcall to ensure that all the sha present
before hmac

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: prepare to allow multiple digest driver ...

This will allow to have hw driver or asm optimised driver.

Use a priority level to determine which one to use at runtime.
The generic one will be 0.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

digest: add digest callback ...

Combination of @init and @update and @final. This function
effectively behaves as the entire chain of operations, @init,
@update and @final issued in sequence. This is added for hardware
which cannot do even the @finup, but can only do the whole
transformation in one run.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

digest: add verify callback ...

this will allow to compare a md with the original one

When calling this do not call final

For RSA_SIGN verification final does not exist only verify
as final will be for signing

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: digest: Fix coding style ...

When declaring pointer data or a function that returns a pointer type, the
preferred use of '*' is adjacent to the data name or function name and not
adjacent to the type name.

Fix the remaining occurences in crypto/

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

digest: add HMAC support for md5, sha1, sha224, sha256, sha384, sha512 ...

the hmac algo will be registered as hmac(%s) such as hmac(sha256)

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: add sha384 & sha512 support ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>