HMAC was originally implemented for SHA1 digest according to RFC2104.
The RFC defined blocksize for all digests as 64 bytes. But RFC4868
requires blocksize for SHA384/SHA512 to be 128 bytes.
Extend HMAC implementation to support variable blocksize and fix it for
SHA384/SHA512.
* Add SCRAM_DIGEST_SIZE macro for maximum possible digest size. It will
avoid new buffer overflow errors when new digests are added.
* Fix buffer overflow in sasl_scram(). Buffers were allocated for SHA1
digest size.
* Fix bug with handler re-registration when a SASL SCRAM mechanism
fails.
@sjaeckel integrated clang-format with formal coding style. Run his
script and commit changes.
There are pros and cons of this commit.
Mixed coding style is a "broken window". A good single style simplifies
reading and writing code.
On the other hand, this is a big change which will lead to conflicts.
sha1.c contains symbols that overlap with libcrypto. This patch
fixes linking with libstrophe as static library.
Prefix crypto_ will help to group other crypto API in the future.
Passing an array as a parameter to a function in C doesn't work, they decay
into pointer. Defining them is pointless and error prone, so just
declare a pointer.
