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![Eric Biggers](/assets/img/avatar_default.png)
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <mpatocka@redhat.com> (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
695 lines
19 KiB
C
695 lines
19 KiB
C
/*
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* VMAC: Message Authentication Code using Universal Hashing
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*
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* Reference: https://tools.ietf.org/html/draft-krovetz-vmac-01
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*
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* Copyright (c) 2009, Intel Corporation.
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* Copyright (c) 2018, Google Inc.
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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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* Derived from:
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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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* Last modified: 17 APR 08, 1700 PDT
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*/
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#include <asm/unaligned.h>
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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/internal/hash.h>
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/*
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* User definable settings.
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*/
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#define VMAC_TAG_LEN 64
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#define VMAC_KEY_SIZE 128/* Must be 128, 192 or 256 */
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#define VMAC_KEY_LEN (VMAC_KEY_SIZE/8)
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#define VMAC_NHBYTES 128/* Must 2^i for any 3 < i < 13 Standard = 128*/
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#define VMAC_NONCEBYTES 16
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/* per-transform (per-key) context */
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struct vmac_tfm_ctx {
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struct crypto_cipher *cipher;
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u64 nhkey[(VMAC_NHBYTES/8)+2*(VMAC_TAG_LEN/64-1)];
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u64 polykey[2*VMAC_TAG_LEN/64];
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u64 l3key[2*VMAC_TAG_LEN/64];
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};
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/* per-request context */
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struct vmac_desc_ctx {
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union {
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u8 partial[VMAC_NHBYTES]; /* partial block */
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__le64 partial_words[VMAC_NHBYTES / 8];
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};
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unsigned int partial_size; /* size of the partial block */
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bool first_block_processed;
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u64 polytmp[2*VMAC_TAG_LEN/64]; /* running total of L2-hash */
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union {
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u8 bytes[VMAC_NONCEBYTES];
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__be64 pads[VMAC_NONCEBYTES / 8];
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} nonce;
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unsigned int nonce_size; /* nonce bytes filled so far */
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};
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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 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;
|
|
rl += (0 - (rl > p64-1)) & 257;
|
|
return rl;
|
|
}
|
|
|
|
/* L1 and L2-hash one or more VMAC_NHBYTES-byte blocks */
|
|
static void vhash_blocks(const struct vmac_tfm_ctx *tctx,
|
|
struct vmac_desc_ctx *dctx,
|
|
const __le64 *mptr, unsigned int blocks)
|
|
{
|
|
const u64 *kptr = tctx->nhkey;
|
|
const u64 pkh = tctx->polykey[0];
|
|
const u64 pkl = tctx->polykey[1];
|
|
u64 ch = dctx->polytmp[0];
|
|
u64 cl = dctx->polytmp[1];
|
|
u64 rh, rl;
|
|
|
|
if (!dctx->first_block_processed) {
|
|
dctx->first_block_processed = true;
|
|
nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
|
|
rh &= m62;
|
|
ADD128(ch, cl, rh, rl);
|
|
mptr += (VMAC_NHBYTES/sizeof(u64));
|
|
blocks--;
|
|
}
|
|
|
|
while (blocks--) {
|
|
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));
|
|
}
|
|
|
|
dctx->polytmp[0] = ch;
|
|
dctx->polytmp[1] = cl;
|
|
}
|
|
|
|
static int vmac_setkey(struct crypto_shash *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
struct vmac_tfm_ctx *tctx = crypto_shash_ctx(tfm);
|
|
__be64 out[2];
|
|
u8 in[16] = { 0 };
|
|
unsigned int i;
|
|
int err;
|
|
|
|
if (keylen != VMAC_KEY_LEN)
|
|
return -EINVAL;
|
|
|
|
err = crypto_cipher_setkey(tctx->cipher, key, keylen);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Fill nh key */
|
|
in[0] = 0x80;
|
|
for (i = 0; i < ARRAY_SIZE(tctx->nhkey); i += 2) {
|
|
crypto_cipher_encrypt_one(tctx->cipher, (u8 *)out, in);
|
|
tctx->nhkey[i] = be64_to_cpu(out[0]);
|
|
tctx->nhkey[i+1] = be64_to_cpu(out[1]);
|
|
in[15]++;
|
|
}
|
|
|
|
/* Fill poly key */
|
|
in[0] = 0xC0;
|
|
in[15] = 0;
|
|
for (i = 0; i < ARRAY_SIZE(tctx->polykey); i += 2) {
|
|
crypto_cipher_encrypt_one(tctx->cipher, (u8 *)out, in);
|
|
tctx->polykey[i] = be64_to_cpu(out[0]) & mpoly;
|
|
tctx->polykey[i+1] = be64_to_cpu(out[1]) & mpoly;
|
|
in[15]++;
|
|
}
|
|
|
|
/* Fill ip key */
|
|
in[0] = 0xE0;
|
|
in[15] = 0;
|
|
for (i = 0; i < ARRAY_SIZE(tctx->l3key); i += 2) {
|
|
do {
|
|
crypto_cipher_encrypt_one(tctx->cipher, (u8 *)out, in);
|
|
tctx->l3key[i] = be64_to_cpu(out[0]);
|
|
tctx->l3key[i+1] = be64_to_cpu(out[1]);
|
|
in[15]++;
|
|
} while (tctx->l3key[i] >= p64 || tctx->l3key[i+1] >= p64);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmac_init(struct shash_desc *desc)
|
|
{
|
|
const struct vmac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
|
|
struct vmac_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
dctx->partial_size = 0;
|
|
dctx->first_block_processed = false;
|
|
memcpy(dctx->polytmp, tctx->polykey, sizeof(dctx->polytmp));
|
|
dctx->nonce_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int vmac_update(struct shash_desc *desc, const u8 *p, unsigned int len)
|
|
{
|
|
const struct vmac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
|
|
struct vmac_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
unsigned int n;
|
|
|
|
/* Nonce is passed as first VMAC_NONCEBYTES bytes of data */
|
|
if (dctx->nonce_size < VMAC_NONCEBYTES) {
|
|
n = min(len, VMAC_NONCEBYTES - dctx->nonce_size);
|
|
memcpy(&dctx->nonce.bytes[dctx->nonce_size], p, n);
|
|
dctx->nonce_size += n;
|
|
p += n;
|
|
len -= n;
|
|
}
|
|
|
|
if (dctx->partial_size) {
|
|
n = min(len, VMAC_NHBYTES - dctx->partial_size);
|
|
memcpy(&dctx->partial[dctx->partial_size], p, n);
|
|
dctx->partial_size += n;
|
|
p += n;
|
|
len -= n;
|
|
if (dctx->partial_size == VMAC_NHBYTES) {
|
|
vhash_blocks(tctx, dctx, dctx->partial_words, 1);
|
|
dctx->partial_size = 0;
|
|
}
|
|
}
|
|
|
|
if (len >= VMAC_NHBYTES) {
|
|
n = round_down(len, VMAC_NHBYTES);
|
|
/* TODO: 'p' may be misaligned here */
|
|
vhash_blocks(tctx, dctx, (const __le64 *)p, n / VMAC_NHBYTES);
|
|
p += n;
|
|
len -= n;
|
|
}
|
|
|
|
if (len) {
|
|
memcpy(dctx->partial, p, len);
|
|
dctx->partial_size = len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 vhash_final(const struct vmac_tfm_ctx *tctx,
|
|
struct vmac_desc_ctx *dctx)
|
|
{
|
|
unsigned int partial = dctx->partial_size;
|
|
u64 ch = dctx->polytmp[0];
|
|
u64 cl = dctx->polytmp[1];
|
|
|
|
/* L1 and L2-hash the final block if needed */
|
|
if (partial) {
|
|
/* Zero-pad to next 128-bit boundary */
|
|
unsigned int n = round_up(partial, 16);
|
|
u64 rh, rl;
|
|
|
|
memset(&dctx->partial[partial], 0, n - partial);
|
|
nh_16(dctx->partial_words, tctx->nhkey, n / 8, rh, rl);
|
|
rh &= m62;
|
|
if (dctx->first_block_processed)
|
|
poly_step(ch, cl, tctx->polykey[0], tctx->polykey[1],
|
|
rh, rl);
|
|
else
|
|
ADD128(ch, cl, rh, rl);
|
|
}
|
|
|
|
/* L3-hash the 128-bit output of L2-hash */
|
|
return l3hash(ch, cl, tctx->l3key[0], tctx->l3key[1], partial * 8);
|
|
}
|
|
|
|
static int vmac_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
const struct vmac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
|
|
struct vmac_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
int index;
|
|
u64 hash, pad;
|
|
|
|
if (dctx->nonce_size != VMAC_NONCEBYTES)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* The VMAC specification requires a nonce at least 1 bit shorter than
|
|
* the block cipher's block length, so we actually only accept a 127-bit
|
|
* nonce. We define the unused bit to be the first one and require that
|
|
* it be 0, so the needed prepending of a 0 bit is implicit.
|
|
*/
|
|
if (dctx->nonce.bytes[0] & 0x80)
|
|
return -EINVAL;
|
|
|
|
/* Finish calculating the VHASH of the message */
|
|
hash = vhash_final(tctx, dctx);
|
|
|
|
/* Generate pseudorandom pad by encrypting the nonce */
|
|
BUILD_BUG_ON(VMAC_NONCEBYTES != 2 * (VMAC_TAG_LEN / 8));
|
|
index = dctx->nonce.bytes[VMAC_NONCEBYTES - 1] & 1;
|
|
dctx->nonce.bytes[VMAC_NONCEBYTES - 1] &= ~1;
|
|
crypto_cipher_encrypt_one(tctx->cipher, dctx->nonce.bytes,
|
|
dctx->nonce.bytes);
|
|
pad = be64_to_cpu(dctx->nonce.pads[index]);
|
|
|
|
/* The VMAC is the sum of VHASH and the pseudorandom pad */
|
|
put_unaligned_be64(hash + pad, out);
|
|
return 0;
|
|
}
|
|
|
|
static int vmac_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
|
|
struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
|
|
struct vmac_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
|
|
struct crypto_cipher *cipher;
|
|
|
|
cipher = crypto_spawn_cipher(spawn);
|
|
if (IS_ERR(cipher))
|
|
return PTR_ERR(cipher);
|
|
|
|
tctx->cipher = cipher;
|
|
return 0;
|
|
}
|
|
|
|
static void vmac_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct vmac_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto_free_cipher(tctx->cipher);
|
|
}
|
|
|
|
static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
struct shash_instance *inst;
|
|
struct crypto_cipher_spawn *spawn;
|
|
struct crypto_alg *alg;
|
|
u32 mask;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
|
|
if (err)
|
|
return err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
spawn = shash_instance_ctx(inst);
|
|
|
|
err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
alg = crypto_spawn_cipher_alg(spawn);
|
|
|
|
err = -EINVAL;
|
|
if (alg->cra_blocksize != VMAC_NONCEBYTES)
|
|
goto err_free_inst;
|
|
|
|
err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
|
|
if (err)
|
|
goto err_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.base.cra_ctxsize = sizeof(struct vmac_tfm_ctx);
|
|
inst->alg.base.cra_init = vmac_init_tfm;
|
|
inst->alg.base.cra_exit = vmac_exit_tfm;
|
|
|
|
inst->alg.descsize = sizeof(struct vmac_desc_ctx);
|
|
inst->alg.digestsize = VMAC_TAG_LEN / 8;
|
|
inst->alg.init = vmac_init;
|
|
inst->alg.update = vmac_update;
|
|
inst->alg.final = vmac_final;
|
|
inst->alg.setkey = vmac_setkey;
|
|
|
|
inst->free = shash_free_singlespawn_instance;
|
|
|
|
err = shash_register_instance(tmpl, inst);
|
|
if (err) {
|
|
err_free_inst:
|
|
shash_free_singlespawn_instance(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_template vmac64_tmpl = {
|
|
.name = "vmac64",
|
|
.create = vmac_create,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init vmac_module_init(void)
|
|
{
|
|
return crypto_register_template(&vmac64_tmpl);
|
|
}
|
|
|
|
static void __exit vmac_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&vmac64_tmpl);
|
|
}
|
|
|
|
subsys_initcall(vmac_module_init);
|
|
module_exit(vmac_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("VMAC hash algorithm");
|
|
MODULE_ALIAS_CRYPTO("vmac64");
|