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The RC4_CHUNK related code is intended to process native word sized
chunks if the input and output are naturally aligned. However, RC4_CHUNK
is currently a mess of machine dependent defines.
Replace this with uint64_t on all architectures - 64 bit architectures will
be happy with this and on 32 bit architectures the compiler can decompose
this into multiple 32 bit operations. Provide separate rc4_chunk()
implementations for big and little endian, since not all architectures
have a byte swap instruction that would make this a cheap conversion.
Thanks to gkoehler@ and tb@ for testing on big endian.
ok tb@
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Provide a static inline rc4_step() function that replaces the near
identical RC4_STEP and RC4_LOOP macros. Simplify the processing loop and
use for loops with small constants, which the compiler can unroll if it
wants to do so.
Inline the SK_LOOP macro in rc4_set_key_internal(), also using a small loop
that the compiler will most likely unroll.
ok tb@
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The RC4_INDEX define switches between base pointer indexing and per-byte
pointer increment. This supposedly made a huge difference to performance
on x86 at some point, however compilers have improved somewhat since then.
There is no change (or effectively no change) in generated assembly on
a the majority of LLVM platforms and even when there is some change
(e.g. aarch64), there is no noticable performance difference.
Simplify the (still messy) macros/code and mop up RC4_INDEX.
ok tb@
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Provide a per architecture crypto_arch.h - this will be used in a similar
manner to bn_arch.h and will allow for architecture specific #defines and
static inline functions. Move the HAVE_AES_* and HAVE_RC4_* defines here.
ok tb@
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ok jsing tb beck
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Rather than having public API switch between C and assembly, always
use C functions as entry points, which then call an assembly
implementation (if available). This makes it significantly easier
to deal with symbol aliasing/namespaces and it also means we
benefit from vulnerability prevention provided by the C compiler.
Rename the assembly generated functions from RC4() to rc4_internal()
and RC4_set_key() to rc4_set_key_internal(). Always include rc4.c
and change it to use defines that are similar to those used in BN.
ok beck@ joshua@ tb@
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Discussed with tb@
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for 20th century historians, and can be put in the Attic.
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functionality for shared libs.
Note that routines such as sslv2_init and friends that use RSA will
not work due to lack of RSA in this library.
Needs documentation and help from ports for easy upgrade to full
functionality where legally possible.
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