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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-01-27 20:14:02 +0400 | 
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-01-27 20:14:02 +0400 | 
| commit | 6c02b7b1610f873888af20f291c07730889ff0f9 (patch) | |
| tree | 1b33e6642cc81605b8d37c0bda0abff0ba64fa2d /lib/mpi/mpi-inline.h | |
| parent | 7a7546b377bdaa25ac77f33d9433c59f259b9688 (diff) | |
| parent | dcd6c92267155e70a94b3927bce681ce74b80d1f (diff) | |
| download | linux-6c02b7b1610f873888af20f291c07730889ff0f9.tar.xz | |
Merge commit 'v3.3-rc1' into stable/for-linus-fixes-3.3
* commit 'v3.3-rc1': (9775 commits)
  Linux 3.3-rc1
  x86, syscall: Need __ARCH_WANT_SYS_IPC for 32 bits
  qnx4: don't leak ->BitMap on late failure exits
  qnx4: reduce the insane nesting in qnx4_checkroot()
  qnx4: di_fname is an array, for crying out loud...
  KEYS: Permit key_serial() to be called with a const key pointer
  keys: fix user_defined key sparse messages
  ima: fix cred sparse warning
  uml: fix compile for x86-64
  MPILIB: Add a missing ENOMEM check
  tpm: fix (ACPI S3) suspend regression
  nvme: fix merge error due to change of 'make_request_fn' fn type
  xen: using EXPORT_SYMBOL requires including export.h
  gpio: tps65910: Use correct offset for gpio initialization
  acpi/apei/einj: Add extensions to EINJ from rev 5.0 of acpi spec
  intel_idle: Split up and provide per CPU initialization func
  ACPI processor: Remove unneeded variable passed by acpi_processor_hotadd_init V2
  tg3: Fix single-vector MSI-X code
  openvswitch: Fix multipart datapath dumps.
  ipv6: fix per device IP snmp counters
  ...
Diffstat (limited to 'lib/mpi/mpi-inline.h')
| -rw-r--r-- | lib/mpi/mpi-inline.h | 122 | 
1 files changed, 122 insertions, 0 deletions
diff --git a/lib/mpi/mpi-inline.h b/lib/mpi/mpi-inline.h new file mode 100644 index 000000000000..e2b39852b30a --- /dev/null +++ b/lib/mpi/mpi-inline.h @@ -0,0 +1,122 @@ +/* mpi-inline.h  -  Internal to the Multi Precision Integers + *	Copyright (C) 1994, 1996, 1998, 1999 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * GnuPG is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * GnuPG is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + * + * Note: This code is heavily based on the GNU MP Library. + *	 Actually it's the same code with only minor changes in the + *	 way the data is stored; this is to support the abstraction + *	 of an optional secure memory allocation which may be used + *	 to avoid revealing of sensitive data due to paging etc. + *	 The GNU MP Library itself is published under the LGPL; + *	 however I decided to publish this code under the plain GPL. + */ + +#ifndef G10_MPI_INLINE_H +#define G10_MPI_INLINE_H + +#ifndef G10_MPI_INLINE_DECL +#define G10_MPI_INLINE_DECL  extern inline +#endif + +G10_MPI_INLINE_DECL mpi_limb_t +mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, +	      mpi_size_t s1_size, mpi_limb_t s2_limb) +{ +	mpi_limb_t x; + +	x = *s1_ptr++; +	s2_limb += x; +	*res_ptr++ = s2_limb; +	if (s2_limb < x) {	/* sum is less than the left operand: handle carry */ +		while (--s1_size) { +			x = *s1_ptr++ + 1;	/* add carry */ +			*res_ptr++ = x;	/* and store */ +			if (x)	/* not 0 (no overflow): we can stop */ +				goto leave; +		} +		return 1;	/* return carry (size of s1 to small) */ +	} + +leave: +	if (res_ptr != s1_ptr) {	/* not the same variable */ +		mpi_size_t i;	/* copy the rest */ +		for (i = 0; i < s1_size - 1; i++) +			res_ptr[i] = s1_ptr[i]; +	} +	return 0;		/* no carry */ +} + +G10_MPI_INLINE_DECL mpi_limb_t +mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size, +	    mpi_ptr_t s2_ptr, mpi_size_t s2_size) +{ +	mpi_limb_t cy = 0; + +	if (s2_size) +		cy = mpihelp_add_n(res_ptr, s1_ptr, s2_ptr, s2_size); + +	if (s1_size - s2_size) +		cy = mpihelp_add_1(res_ptr + s2_size, s1_ptr + s2_size, +				   s1_size - s2_size, cy); +	return cy; +} + +G10_MPI_INLINE_DECL mpi_limb_t +mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, +	      mpi_size_t s1_size, mpi_limb_t s2_limb) +{ +	mpi_limb_t x; + +	x = *s1_ptr++; +	s2_limb = x - s2_limb; +	*res_ptr++ = s2_limb; +	if (s2_limb > x) { +		while (--s1_size) { +			x = *s1_ptr++; +			*res_ptr++ = x - 1; +			if (x) +				goto leave; +		} +		return 1; +	} + +leave: +	if (res_ptr != s1_ptr) { +		mpi_size_t i; +		for (i = 0; i < s1_size - 1; i++) +			res_ptr[i] = s1_ptr[i]; +	} +	return 0; +} + +G10_MPI_INLINE_DECL mpi_limb_t +mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size, +	    mpi_ptr_t s2_ptr, mpi_size_t s2_size) +{ +	mpi_limb_t cy = 0; + +	if (s2_size) +		cy = mpihelp_sub_n(res_ptr, s1_ptr, s2_ptr, s2_size); + +	if (s1_size - s2_size) +		cy = mpihelp_sub_1(res_ptr + s2_size, s1_ptr + s2_size, +				   s1_size - s2_size, cy); +	return cy; +} + +#endif /*G10_MPI_INLINE_H */  | 
