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>

string: Fix (v)asprintf prototypes ...

Our asprintf and vasprintf have different prototypes than the glibc
functions. This causes trouble when we want to share barebox code
with userspace code. Change the prototypes for (v)asprintf to match
the glibc prototypes. Since the current (v)asprintf are convenient
to use change the existing functions to b(v)asprintf.

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>

crypto: digest: speficied when a digest need a key to be used ...

such as for hmac(xxx) you must provide a key

This will allow to enforce the correct parameter at digest command

<digest>sum is not impacted

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

crypto: hmac: use digest_digest and check the return of every digest_xxx ...

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>