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![Kees Cook](/assets/img/avatar_default.png)
This adds the module loading prefix "crypto-" to the template lookup as well. For example, attempting to load 'vfat(blowfish)' via AF_ALG now correctly includes the "crypto-" prefix at every level, correctly rejecting "vfat": net-pf-38 algif-hash crypto-vfat(blowfish) crypto-vfat(blowfish)-all crypto-vfat Reported-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
716 lines
19 KiB
C
716 lines
19 KiB
C
/*
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* Modified to interface to the Linux kernel
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* Copyright (c) 2009, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*/
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/* --------------------------------------------------------------------------
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* VMAC and VHASH Implementation by Ted Krovetz (tdk@acm.org) and Wei Dai.
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* This implementation is herby placed in the public domain.
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* The authors offers no warranty. Use at your own risk.
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* Please send bug reports to the authors.
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* Last modified: 17 APR 08, 1700 PDT
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* ----------------------------------------------------------------------- */
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <asm/byteorder.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/vmac.h>
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#include <crypto/internal/hash.h>
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/*
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* Constants and masks
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*/
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#define UINT64_C(x) x##ULL
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static const u64 p64 = UINT64_C(0xfffffffffffffeff); /* 2^64 - 257 prime */
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static const u64 m62 = UINT64_C(0x3fffffffffffffff); /* 62-bit mask */
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static const u64 m63 = UINT64_C(0x7fffffffffffffff); /* 63-bit mask */
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static const u64 m64 = UINT64_C(0xffffffffffffffff); /* 64-bit mask */
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static const u64 mpoly = UINT64_C(0x1fffffff1fffffff); /* Poly key mask */
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#define pe64_to_cpup le64_to_cpup /* Prefer little endian */
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#ifdef __LITTLE_ENDIAN
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#define INDEX_HIGH 1
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#define INDEX_LOW 0
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#else
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#define INDEX_HIGH 0
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#define INDEX_LOW 1
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#endif
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/*
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* The following routines are used in this implementation. They are
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* written via macros to simulate zero-overhead call-by-reference.
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*
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* MUL64: 64x64->128-bit multiplication
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* PMUL64: assumes top bits cleared on inputs
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* ADD128: 128x128->128-bit addition
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*/
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#define ADD128(rh, rl, ih, il) \
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do { \
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u64 _il = (il); \
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(rl) += (_il); \
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if ((rl) < (_il)) \
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(rh)++; \
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(rh) += (ih); \
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} while (0)
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#define MUL32(i1, i2) ((u64)(u32)(i1)*(u32)(i2))
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#define PMUL64(rh, rl, i1, i2) /* Assumes m doesn't overflow */ \
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do { \
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u64 _i1 = (i1), _i2 = (i2); \
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u64 m = MUL32(_i1, _i2>>32) + MUL32(_i1>>32, _i2); \
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rh = MUL32(_i1>>32, _i2>>32); \
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rl = MUL32(_i1, _i2); \
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ADD128(rh, rl, (m >> 32), (m << 32)); \
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} while (0)
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#define MUL64(rh, rl, i1, i2) \
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do { \
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u64 _i1 = (i1), _i2 = (i2); \
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u64 m1 = MUL32(_i1, _i2>>32); \
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u64 m2 = MUL32(_i1>>32, _i2); \
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rh = MUL32(_i1>>32, _i2>>32); \
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rl = MUL32(_i1, _i2); \
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ADD128(rh, rl, (m1 >> 32), (m1 << 32)); \
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ADD128(rh, rl, (m2 >> 32), (m2 << 32)); \
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} while (0)
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/*
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* For highest performance the L1 NH and L2 polynomial hashes should be
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* carefully implemented to take advantage of one's target architecture.
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* Here these two hash functions are defined multiple time; once for
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* 64-bit architectures, once for 32-bit SSE2 architectures, and once
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* for the rest (32-bit) architectures.
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* For each, nh_16 *must* be defined (works on multiples of 16 bytes).
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* Optionally, nh_vmac_nhbytes can be defined (for multiples of
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* VMAC_NHBYTES), and nh_16_2 and nh_vmac_nhbytes_2 (versions that do two
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* NH computations at once).
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*/
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#ifdef CONFIG_64BIT
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#define nh_16(mp, kp, nw, rh, rl) \
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do { \
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int i; u64 th, tl; \
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rh = rl = 0; \
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for (i = 0; i < nw; i += 2) { \
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MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
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pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
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ADD128(rh, rl, th, tl); \
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} \
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} while (0)
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#define nh_16_2(mp, kp, nw, rh, rl, rh1, rl1) \
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do { \
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int i; u64 th, tl; \
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rh1 = rl1 = rh = rl = 0; \
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for (i = 0; i < nw; i += 2) { \
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MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
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pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i+2], \
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pe64_to_cpup((mp)+i+1)+(kp)[i+3]); \
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ADD128(rh1, rl1, th, tl); \
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} \
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} while (0)
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#if (VMAC_NHBYTES >= 64) /* These versions do 64-bytes of message at a time */
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#define nh_vmac_nhbytes(mp, kp, nw, rh, rl) \
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do { \
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int i; u64 th, tl; \
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rh = rl = 0; \
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for (i = 0; i < nw; i += 8) { \
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MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
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pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+2], \
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pe64_to_cpup((mp)+i+3)+(kp)[i+3]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+4], \
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pe64_to_cpup((mp)+i+5)+(kp)[i+5]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+6], \
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pe64_to_cpup((mp)+i+7)+(kp)[i+7]); \
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ADD128(rh, rl, th, tl); \
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} \
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} while (0)
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#define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh1, rl1) \
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do { \
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int i; u64 th, tl; \
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rh1 = rl1 = rh = rl = 0; \
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for (i = 0; i < nw; i += 8) { \
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MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
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pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i+2], \
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pe64_to_cpup((mp)+i+1)+(kp)[i+3]); \
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ADD128(rh1, rl1, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+2], \
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pe64_to_cpup((mp)+i+3)+(kp)[i+3]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+4], \
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pe64_to_cpup((mp)+i+3)+(kp)[i+5]); \
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ADD128(rh1, rl1, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+4], \
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pe64_to_cpup((mp)+i+5)+(kp)[i+5]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+6], \
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pe64_to_cpup((mp)+i+5)+(kp)[i+7]); \
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ADD128(rh1, rl1, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+6], \
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pe64_to_cpup((mp)+i+7)+(kp)[i+7]); \
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ADD128(rh, rl, th, tl); \
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MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+8], \
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pe64_to_cpup((mp)+i+7)+(kp)[i+9]); \
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ADD128(rh1, rl1, th, tl); \
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} \
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} while (0)
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#endif
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#define poly_step(ah, al, kh, kl, mh, ml) \
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do { \
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u64 t1h, t1l, t2h, t2l, t3h, t3l, z = 0; \
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/* compute ab*cd, put bd into result registers */ \
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PMUL64(t3h, t3l, al, kh); \
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PMUL64(t2h, t2l, ah, kl); \
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PMUL64(t1h, t1l, ah, 2*kh); \
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PMUL64(ah, al, al, kl); \
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/* add 2 * ac to result */ \
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ADD128(ah, al, t1h, t1l); \
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/* add together ad + bc */ \
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ADD128(t2h, t2l, t3h, t3l); \
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/* now (ah,al), (t2l,2*t2h) need summing */ \
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/* first add the high registers, carrying into t2h */ \
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ADD128(t2h, ah, z, t2l); \
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/* double t2h and add top bit of ah */ \
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t2h = 2 * t2h + (ah >> 63); \
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ah &= m63; \
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/* now add the low registers */ \
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ADD128(ah, al, mh, ml); \
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ADD128(ah, al, z, t2h); \
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} while (0)
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#else /* ! CONFIG_64BIT */
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#ifndef nh_16
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#define nh_16(mp, kp, nw, rh, rl) \
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do { \
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u64 t1, t2, m1, m2, t; \
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int i; \
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rh = rl = t = 0; \
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for (i = 0; i < nw; i += 2) { \
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t1 = pe64_to_cpup(mp+i) + kp[i]; \
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t2 = pe64_to_cpup(mp+i+1) + kp[i+1]; \
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m2 = MUL32(t1 >> 32, t2); \
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m1 = MUL32(t1, t2 >> 32); \
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ADD128(rh, rl, MUL32(t1 >> 32, t2 >> 32), \
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MUL32(t1, t2)); \
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rh += (u64)(u32)(m1 >> 32) \
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+ (u32)(m2 >> 32); \
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t += (u64)(u32)m1 + (u32)m2; \
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} \
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ADD128(rh, rl, (t >> 32), (t << 32)); \
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} while (0)
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#endif
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static void poly_step_func(u64 *ahi, u64 *alo,
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const u64 *kh, const u64 *kl,
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const u64 *mh, const u64 *ml)
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{
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#define a0 (*(((u32 *)alo)+INDEX_LOW))
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#define a1 (*(((u32 *)alo)+INDEX_HIGH))
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#define a2 (*(((u32 *)ahi)+INDEX_LOW))
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#define a3 (*(((u32 *)ahi)+INDEX_HIGH))
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#define k0 (*(((u32 *)kl)+INDEX_LOW))
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#define k1 (*(((u32 *)kl)+INDEX_HIGH))
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#define k2 (*(((u32 *)kh)+INDEX_LOW))
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#define k3 (*(((u32 *)kh)+INDEX_HIGH))
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u64 p, q, t;
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u32 t2;
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p = MUL32(a3, k3);
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p += p;
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p += *(u64 *)mh;
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p += MUL32(a0, k2);
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p += MUL32(a1, k1);
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p += MUL32(a2, k0);
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t = (u32)(p);
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p >>= 32;
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p += MUL32(a0, k3);
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p += MUL32(a1, k2);
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p += MUL32(a2, k1);
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p += MUL32(a3, k0);
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t |= ((u64)((u32)p & 0x7fffffff)) << 32;
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p >>= 31;
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p += (u64)(((u32 *)ml)[INDEX_LOW]);
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p += MUL32(a0, k0);
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q = MUL32(a1, k3);
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q += MUL32(a2, k2);
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q += MUL32(a3, k1);
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q += q;
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p += q;
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t2 = (u32)(p);
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p >>= 32;
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p += (u64)(((u32 *)ml)[INDEX_HIGH]);
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p += MUL32(a0, k1);
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p += MUL32(a1, k0);
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q = MUL32(a2, k3);
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q += MUL32(a3, k2);
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q += q;
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p += q;
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*(u64 *)(alo) = (p << 32) | t2;
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p >>= 32;
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*(u64 *)(ahi) = p + t;
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#undef a0
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#undef a1
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#undef a2
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#undef a3
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#undef k0
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#undef k1
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#undef k2
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#undef k3
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}
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#define poly_step(ah, al, kh, kl, mh, ml) \
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poly_step_func(&(ah), &(al), &(kh), &(kl), &(mh), &(ml))
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#endif /* end of specialized NH and poly definitions */
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/* At least nh_16 is defined. Defined others as needed here */
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#ifndef nh_16_2
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#define nh_16_2(mp, kp, nw, rh, rl, rh2, rl2) \
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do { \
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nh_16(mp, kp, nw, rh, rl); \
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nh_16(mp, ((kp)+2), nw, rh2, rl2); \
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} while (0)
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#endif
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#ifndef nh_vmac_nhbytes
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#define nh_vmac_nhbytes(mp, kp, nw, rh, rl) \
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nh_16(mp, kp, nw, rh, rl)
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#endif
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#ifndef nh_vmac_nhbytes_2
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#define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh2, rl2) \
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do { \
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nh_vmac_nhbytes(mp, kp, nw, rh, rl); \
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nh_vmac_nhbytes(mp, ((kp)+2), nw, rh2, rl2); \
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} while (0)
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#endif
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static void vhash_abort(struct vmac_ctx *ctx)
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{
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ctx->polytmp[0] = ctx->polykey[0] ;
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ctx->polytmp[1] = ctx->polykey[1] ;
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ctx->first_block_processed = 0;
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}
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static u64 l3hash(u64 p1, u64 p2, u64 k1, u64 k2, u64 len)
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{
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u64 rh, rl, t, z = 0;
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/* fully reduce (p1,p2)+(len,0) mod p127 */
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t = p1 >> 63;
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p1 &= m63;
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ADD128(p1, p2, len, t);
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/* At this point, (p1,p2) is at most 2^127+(len<<64) */
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t = (p1 > m63) + ((p1 == m63) && (p2 == m64));
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ADD128(p1, p2, z, t);
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p1 &= m63;
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/* compute (p1,p2)/(2^64-2^32) and (p1,p2)%(2^64-2^32) */
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t = p1 + (p2 >> 32);
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t += (t >> 32);
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t += (u32)t > 0xfffffffeu;
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p1 += (t >> 32);
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p2 += (p1 << 32);
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/* compute (p1+k1)%p64 and (p2+k2)%p64 */
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p1 += k1;
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p1 += (0 - (p1 < k1)) & 257;
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p2 += k2;
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p2 += (0 - (p2 < k2)) & 257;
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/* compute (p1+k1)*(p2+k2)%p64 */
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MUL64(rh, rl, p1, p2);
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t = rh >> 56;
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ADD128(t, rl, z, rh);
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rh <<= 8;
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ADD128(t, rl, z, rh);
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t += t << 8;
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rl += t;
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rl += (0 - (rl < t)) & 257;
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rl += (0 - (rl > p64-1)) & 257;
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return rl;
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}
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static void vhash_update(const unsigned char *m,
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unsigned int mbytes, /* Pos multiple of VMAC_NHBYTES */
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struct vmac_ctx *ctx)
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{
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u64 rh, rl, *mptr;
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const u64 *kptr = (u64 *)ctx->nhkey;
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int i;
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u64 ch, cl;
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u64 pkh = ctx->polykey[0];
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u64 pkl = ctx->polykey[1];
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if (!mbytes)
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return;
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BUG_ON(mbytes % VMAC_NHBYTES);
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mptr = (u64 *)m;
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i = mbytes / VMAC_NHBYTES; /* Must be non-zero */
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ch = ctx->polytmp[0];
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cl = ctx->polytmp[1];
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if (!ctx->first_block_processed) {
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ctx->first_block_processed = 1;
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nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
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rh &= m62;
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ADD128(ch, cl, rh, rl);
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mptr += (VMAC_NHBYTES/sizeof(u64));
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i--;
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}
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while (i--) {
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nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
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rh &= m62;
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poly_step(ch, cl, pkh, pkl, rh, rl);
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mptr += (VMAC_NHBYTES/sizeof(u64));
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}
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ctx->polytmp[0] = ch;
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ctx->polytmp[1] = cl;
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}
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static u64 vhash(unsigned char m[], unsigned int mbytes,
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|
u64 *tagl, struct vmac_ctx *ctx)
|
|
{
|
|
u64 rh, rl, *mptr;
|
|
const u64 *kptr = (u64 *)ctx->nhkey;
|
|
int i, remaining;
|
|
u64 ch, cl;
|
|
u64 pkh = ctx->polykey[0];
|
|
u64 pkl = ctx->polykey[1];
|
|
|
|
mptr = (u64 *)m;
|
|
i = mbytes / VMAC_NHBYTES;
|
|
remaining = mbytes % VMAC_NHBYTES;
|
|
|
|
if (ctx->first_block_processed) {
|
|
ch = ctx->polytmp[0];
|
|
cl = ctx->polytmp[1];
|
|
} else if (i) {
|
|
nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, ch, cl);
|
|
ch &= m62;
|
|
ADD128(ch, cl, pkh, pkl);
|
|
mptr += (VMAC_NHBYTES/sizeof(u64));
|
|
i--;
|
|
} else if (remaining) {
|
|
nh_16(mptr, kptr, 2*((remaining+15)/16), ch, cl);
|
|
ch &= m62;
|
|
ADD128(ch, cl, pkh, pkl);
|
|
mptr += (VMAC_NHBYTES/sizeof(u64));
|
|
goto do_l3;
|
|
} else {/* Empty String */
|
|
ch = pkh; cl = pkl;
|
|
goto do_l3;
|
|
}
|
|
|
|
while (i--) {
|
|
nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
|
|
rh &= m62;
|
|
poly_step(ch, cl, pkh, pkl, rh, rl);
|
|
mptr += (VMAC_NHBYTES/sizeof(u64));
|
|
}
|
|
if (remaining) {
|
|
nh_16(mptr, kptr, 2*((remaining+15)/16), rh, rl);
|
|
rh &= m62;
|
|
poly_step(ch, cl, pkh, pkl, rh, rl);
|
|
}
|
|
|
|
do_l3:
|
|
vhash_abort(ctx);
|
|
remaining *= 8;
|
|
return l3hash(ch, cl, ctx->l3key[0], ctx->l3key[1], remaining);
|
|
}
|
|
|
|
static u64 vmac(unsigned char m[], unsigned int mbytes,
|
|
const unsigned char n[16], u64 *tagl,
|
|
struct vmac_ctx_t *ctx)
|
|
{
|
|
u64 *in_n, *out_p;
|
|
u64 p, h;
|
|
int i;
|
|
|
|
in_n = ctx->__vmac_ctx.cached_nonce;
|
|
out_p = ctx->__vmac_ctx.cached_aes;
|
|
|
|
i = n[15] & 1;
|
|
if ((*(u64 *)(n+8) != in_n[1]) || (*(u64 *)(n) != in_n[0])) {
|
|
in_n[0] = *(u64 *)(n);
|
|
in_n[1] = *(u64 *)(n+8);
|
|
((unsigned char *)in_n)[15] &= 0xFE;
|
|
crypto_cipher_encrypt_one(ctx->child,
|
|
(unsigned char *)out_p, (unsigned char *)in_n);
|
|
|
|
((unsigned char *)in_n)[15] |= (unsigned char)(1-i);
|
|
}
|
|
p = be64_to_cpup(out_p + i);
|
|
h = vhash(m, mbytes, (u64 *)0, &ctx->__vmac_ctx);
|
|
return le64_to_cpu(p + h);
|
|
}
|
|
|
|
static int vmac_set_key(unsigned char user_key[], struct vmac_ctx_t *ctx)
|
|
{
|
|
u64 in[2] = {0}, out[2];
|
|
unsigned i;
|
|
int err = 0;
|
|
|
|
err = crypto_cipher_setkey(ctx->child, user_key, VMAC_KEY_LEN);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Fill nh key */
|
|
((unsigned char *)in)[0] = 0x80;
|
|
for (i = 0; i < sizeof(ctx->__vmac_ctx.nhkey)/8; i += 2) {
|
|
crypto_cipher_encrypt_one(ctx->child,
|
|
(unsigned char *)out, (unsigned char *)in);
|
|
ctx->__vmac_ctx.nhkey[i] = be64_to_cpup(out);
|
|
ctx->__vmac_ctx.nhkey[i+1] = be64_to_cpup(out+1);
|
|
((unsigned char *)in)[15] += 1;
|
|
}
|
|
|
|
/* Fill poly key */
|
|
((unsigned char *)in)[0] = 0xC0;
|
|
in[1] = 0;
|
|
for (i = 0; i < sizeof(ctx->__vmac_ctx.polykey)/8; i += 2) {
|
|
crypto_cipher_encrypt_one(ctx->child,
|
|
(unsigned char *)out, (unsigned char *)in);
|
|
ctx->__vmac_ctx.polytmp[i] =
|
|
ctx->__vmac_ctx.polykey[i] =
|
|
be64_to_cpup(out) & mpoly;
|
|
ctx->__vmac_ctx.polytmp[i+1] =
|
|
ctx->__vmac_ctx.polykey[i+1] =
|
|
be64_to_cpup(out+1) & mpoly;
|
|
((unsigned char *)in)[15] += 1;
|
|
}
|
|
|
|
/* Fill ip key */
|
|
((unsigned char *)in)[0] = 0xE0;
|
|
in[1] = 0;
|
|
for (i = 0; i < sizeof(ctx->__vmac_ctx.l3key)/8; i += 2) {
|
|
do {
|
|
crypto_cipher_encrypt_one(ctx->child,
|
|
(unsigned char *)out, (unsigned char *)in);
|
|
ctx->__vmac_ctx.l3key[i] = be64_to_cpup(out);
|
|
ctx->__vmac_ctx.l3key[i+1] = be64_to_cpup(out+1);
|
|
((unsigned char *)in)[15] += 1;
|
|
} while (ctx->__vmac_ctx.l3key[i] >= p64
|
|
|| ctx->__vmac_ctx.l3key[i+1] >= p64);
|
|
}
|
|
|
|
/* Invalidate nonce/aes cache and reset other elements */
|
|
ctx->__vmac_ctx.cached_nonce[0] = (u64)-1; /* Ensure illegal nonce */
|
|
ctx->__vmac_ctx.cached_nonce[1] = (u64)0; /* Ensure illegal nonce */
|
|
ctx->__vmac_ctx.first_block_processed = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int vmac_setkey(struct crypto_shash *parent,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
|
|
|
|
if (keylen != VMAC_KEY_LEN) {
|
|
crypto_shash_set_flags(parent, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return vmac_set_key((u8 *)key, ctx);
|
|
}
|
|
|
|
static int vmac_init(struct shash_desc *pdesc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int vmac_update(struct shash_desc *pdesc, const u8 *p,
|
|
unsigned int len)
|
|
{
|
|
struct crypto_shash *parent = pdesc->tfm;
|
|
struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
|
|
int expand;
|
|
int min;
|
|
|
|
expand = VMAC_NHBYTES - ctx->partial_size > 0 ?
|
|
VMAC_NHBYTES - ctx->partial_size : 0;
|
|
|
|
min = len < expand ? len : expand;
|
|
|
|
memcpy(ctx->partial + ctx->partial_size, p, min);
|
|
ctx->partial_size += min;
|
|
|
|
if (len < expand)
|
|
return 0;
|
|
|
|
vhash_update(ctx->partial, VMAC_NHBYTES, &ctx->__vmac_ctx);
|
|
ctx->partial_size = 0;
|
|
|
|
len -= expand;
|
|
p += expand;
|
|
|
|
if (len % VMAC_NHBYTES) {
|
|
memcpy(ctx->partial, p + len - (len % VMAC_NHBYTES),
|
|
len % VMAC_NHBYTES);
|
|
ctx->partial_size = len % VMAC_NHBYTES;
|
|
}
|
|
|
|
vhash_update(p, len - len % VMAC_NHBYTES, &ctx->__vmac_ctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmac_final(struct shash_desc *pdesc, u8 *out)
|
|
{
|
|
struct crypto_shash *parent = pdesc->tfm;
|
|
struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
|
|
vmac_t mac;
|
|
u8 nonce[16] = {};
|
|
|
|
/* vmac() ends up accessing outside the array bounds that
|
|
* we specify. In appears to access up to the next 2-word
|
|
* boundary. We'll just be uber cautious and zero the
|
|
* unwritten bytes in the buffer.
|
|
*/
|
|
if (ctx->partial_size) {
|
|
memset(ctx->partial + ctx->partial_size, 0,
|
|
VMAC_NHBYTES - ctx->partial_size);
|
|
}
|
|
mac = vmac(ctx->partial, ctx->partial_size, nonce, NULL, ctx);
|
|
memcpy(out, &mac, sizeof(vmac_t));
|
|
memzero_explicit(&mac, sizeof(vmac_t));
|
|
memset(&ctx->__vmac_ctx, 0, sizeof(struct vmac_ctx));
|
|
ctx->partial_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int vmac_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_cipher *cipher;
|
|
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
|
struct crypto_spawn *spawn = crypto_instance_ctx(inst);
|
|
struct vmac_ctx_t *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
cipher = crypto_spawn_cipher(spawn);
|
|
if (IS_ERR(cipher))
|
|
return PTR_ERR(cipher);
|
|
|
|
ctx->child = cipher;
|
|
return 0;
|
|
}
|
|
|
|
static void vmac_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct vmac_ctx_t *ctx = crypto_tfm_ctx(tfm);
|
|
crypto_free_cipher(ctx->child);
|
|
}
|
|
|
|
static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
struct shash_instance *inst;
|
|
struct crypto_alg *alg;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
|
|
if (err)
|
|
return err;
|
|
|
|
alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
|
|
CRYPTO_ALG_TYPE_MASK);
|
|
if (IS_ERR(alg))
|
|
return PTR_ERR(alg);
|
|
|
|
inst = shash_alloc_instance("vmac", alg);
|
|
err = PTR_ERR(inst);
|
|
if (IS_ERR(inst))
|
|
goto out_put_alg;
|
|
|
|
err = crypto_init_spawn(shash_instance_ctx(inst), alg,
|
|
shash_crypto_instance(inst),
|
|
CRYPTO_ALG_TYPE_MASK);
|
|
if (err)
|
|
goto out_free_inst;
|
|
|
|
inst->alg.base.cra_priority = alg->cra_priority;
|
|
inst->alg.base.cra_blocksize = alg->cra_blocksize;
|
|
inst->alg.base.cra_alignmask = alg->cra_alignmask;
|
|
|
|
inst->alg.digestsize = sizeof(vmac_t);
|
|
inst->alg.base.cra_ctxsize = sizeof(struct vmac_ctx_t);
|
|
inst->alg.base.cra_init = vmac_init_tfm;
|
|
inst->alg.base.cra_exit = vmac_exit_tfm;
|
|
|
|
inst->alg.init = vmac_init;
|
|
inst->alg.update = vmac_update;
|
|
inst->alg.final = vmac_final;
|
|
inst->alg.setkey = vmac_setkey;
|
|
|
|
err = shash_register_instance(tmpl, inst);
|
|
if (err) {
|
|
out_free_inst:
|
|
shash_free_instance(shash_crypto_instance(inst));
|
|
}
|
|
|
|
out_put_alg:
|
|
crypto_mod_put(alg);
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_template vmac_tmpl = {
|
|
.name = "vmac",
|
|
.create = vmac_create,
|
|
.free = shash_free_instance,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init vmac_module_init(void)
|
|
{
|
|
return crypto_register_template(&vmac_tmpl);
|
|
}
|
|
|
|
static void __exit vmac_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&vmac_tmpl);
|
|
}
|
|
|
|
module_init(vmac_module_init);
|
|
module_exit(vmac_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("VMAC hash algorithm");
|
|
MODULE_ALIAS_CRYPTO("vmac");
|