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add missing initialisation of stack memory to BAFHHostStr(); fix comments for BAFHror()

This commit is contained in:
tg 2015-05-30 22:14:06 +00:00
parent babd9c4cf0
commit 643cd0b7e9
1 changed files with 7 additions and 5 deletions
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12
mirhash.h
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@ -1,6 +1,6 @@
/*-
* Copyright © 2011, 2014
* Thorsten Glaser <tg@mirbsd.org>
* Copyright © 2011, 2014, 2015
* Thorsten “mirabilos” Glaser <tg@mirbsd.org>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
@ -44,7 +44,7 @@
#include <sys/types.h>
__RCSID("$MirOS: src/bin/mksh/mirhash.h,v 1.3 2014/10/02 19:34:06 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/mirhash.h,v 1.4 2015/05/30 22:14:06 tg Exp $");
/*-
* BAFH itself is defined by the following primitives:
@ -61,7 +61,8 @@ __RCSID("$MirOS: src/bin/mksh/mirhash.h,v 1.3 2014/10/02 19:34:06 tg Exp $");
* the context is (still) zero, adding a NUL byte is not ignored.
*
* • BAFHror(eax,cl) evaluates to the unsigned 32-bit integer “eax”,
* rotated right by “cl” ∈ [0;31]; no casting, be careful!
* rotated right by “cl” ∈ [0; 31] (no casting, be careful!) where
* “eax” must be uint32_t and “cl” an in-range integer.
*
* • BAFHFinish(ctx) avalanches the context around so every sub-byte
* depends on all input octets; afterwards, the context variable’s
@ -88,7 +89,7 @@ __RCSID("$MirOS: src/bin/mksh/mirhash.h,v 1.3 2014/10/02 19:34:06 tg Exp $");
* • BAFHHostStr(ctx,buf) does the same for C strings.
*
* All macros may use ctx multiple times in their expansion, but all
* other arguments are always evaluated at most once.
* other arguments are always evaluated at most once except BAFHror.
*
* To stay portable, never use the BAFHHost*() macros (these are for
* host-local entropy shuffling), and encode numbers using ULEB128.
@ -206,6 +207,7 @@ __RCSID("$MirOS: src/bin/mksh/mirhash.h,v 1.3 2014/10/02 19:34:06 tg Exp $");
} BAFHHost_v; \
\
BAFHUpdate_s = (const void *)(s); \
BAFHHost_v.as_u32 = 0; \
if ((BAFHHost_v.as_u8[0] = *BAFHUpdate_s) != 0) \
++BAFHUpdate_s; \
if ((BAFHHost_v.as_u8[1] = *BAFHUpdate_s) != 0) \