Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-29 14:21:47 +00:00
Code Issues Packages Projects Releases Wiki Activity
4b2e7f99cd
linux/crypto/vmac.c
Eric Biggers 7bcb2c99f8 crypto: algapi - use common mechanism for inheriting flags 
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>
2020-07-16 21:49:08 +10:00

696 lines
19 KiB
C
Raw Blame History

/*
* VMAC: Message Authentication Code using Universal Hashing
*
* Reference: https://tools.ietf.org/html/draft-krovetz-vmac-01
*
* Copyright (c) 2009, Intel Corporation.
* Copyright (c) 2018, Google Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*/
/*
* Derived from:
* VMAC and VHASH Implementation by Ted Krovetz (tdk@acm.org) and Wei Dai.
* This implementation is herby placed in the public domain.
* The authors offers no warranty. Use at your own risk.
* Last modified: 17 APR 08, 1700 PDT
*/
#include <asm/unaligned.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <asm/byteorder.h>
#include <crypto/scatterwalk.h>
#include <crypto/internal/hash.h>
/*
* User definable settings.
*/
#define VMAC_TAG_LEN 64
#define VMAC_KEY_SIZE 128/* Must be 128, 192 or 256 */
#define VMAC_KEY_LEN (VMAC_KEY_SIZE/8)
#define VMAC_NHBYTES 128/* Must 2^i for any 3 < i < 13 Standard = 128*/
#define VMAC_NONCEBYTES 16
/* per-transform (per-key) context */
struct vmac_tfm_ctx {
struct crypto_cipher *cipher;
u64 nhkey[(VMAC_NHBYTES/8)+2*(VMAC_TAG_LEN/64-1)];
u64 polykey[2*VMAC_TAG_LEN/64];
u64 l3key[2*VMAC_TAG_LEN/64];
};
/* per-request context */
struct vmac_desc_ctx {
union {
u8 partial[VMAC_NHBYTES]; /* partial block */
__le64 partial_words[VMAC_NHBYTES / 8];
};
unsigned int partial_size; /* size of the partial block */
bool first_block_processed;
u64 polytmp[2*VMAC_TAG_LEN/64]; /* running total of L2-hash */
union {
u8 bytes[VMAC_NONCEBYTES];
__be64 pads[VMAC_NONCEBYTES / 8];
} nonce;
unsigned int nonce_size; /* nonce bytes filled so far */
};
/*
* Constants and masks
*/
#define UINT64_C(x) x##ULL
static const u64 p64 = UINT64_C(0xfffffffffffffeff); /* 2^64 - 257 prime */
static const u64 m62 = UINT64_C(0x3fffffffffffffff); /* 62-bit mask */
static const u64 m63 = UINT64_C(0x7fffffffffffffff); /* 63-bit mask */
static const u64 m64 = UINT64_C(0xffffffffffffffff); /* 64-bit mask */
static const u64 mpoly = UINT64_C(0x1fffffff1fffffff); /* Poly key mask */
#define pe64_to_cpup le64_to_cpup /* Prefer little endian */
#ifdef __LITTLE_ENDIAN
#define INDEX_HIGH 1
#define INDEX_LOW 0
#else
#define INDEX_HIGH 0
#define INDEX_LOW 1
#endif
/*
* The following routines are used in this implementation. They are
* written via macros to simulate zero-overhead call-by-reference.
*
* MUL64: 64x64->128-bit multiplication
* PMUL64: assumes top bits cleared on inputs
* ADD128: 128x128->128-bit addition
*/
#define ADD128(rh, rl, ih, il) \
do { \
u64 _il = (il); \
(rl) += (_il); \
if ((rl) < (_il)) \
(rh)++; \
(rh) += (ih); \
} while (0)
#define MUL32(i1, i2) ((u64)(u32)(i1)*(u32)(i2))
#define PMUL64(rh, rl, i1, i2) /* Assumes m doesn't overflow */ \
do { \
u64 _i1 = (i1), _i2 = (i2); \
u64 m = MUL32(_i1, _i2>>32) + MUL32(_i1>>32, _i2); \
rh = MUL32(_i1>>32, _i2>>32); \
rl = MUL32(_i1, _i2); \
ADD128(rh, rl, (m >> 32), (m << 32)); \
} while (0)
#define MUL64(rh, rl, i1, i2) \
do { \
u64 _i1 = (i1), _i2 = (i2); \
u64 m1 = MUL32(_i1, _i2>>32); \
u64 m2 = MUL32(_i1>>32, _i2); \
rh = MUL32(_i1>>32, _i2>>32); \
rl = MUL32(_i1, _i2); \
ADD128(rh, rl, (m1 >> 32), (m1 << 32)); \
ADD128(rh, rl, (m2 >> 32), (m2 << 32)); \
} while (0)
/*
* For highest performance the L1 NH and L2 polynomial hashes should be
* carefully implemented to take advantage of one's target architecture.
* Here these two hash functions are defined multiple time; once for
* 64-bit architectures, once for 32-bit SSE2 architectures, and once
* for the rest (32-bit) architectures.
* For each, nh_16 *must* be defined (works on multiples of 16 bytes).
* Optionally, nh_vmac_nhbytes can be defined (for multiples of
* VMAC_NHBYTES), and nh_16_2 and nh_vmac_nhbytes_2 (versions that do two
* NH computations at once).
*/
#ifdef CONFIG_64BIT
#define nh_16(mp, kp, nw, rh, rl) \
do { \
int i; u64 th, tl; \
rh = rl = 0; \
for (i = 0; i < nw; i += 2) { \
MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
ADD128(rh, rl, th, tl); \
} \
} while (0)
#define nh_16_2(mp, kp, nw, rh, rl, rh1, rl1) \
do { \
int i; u64 th, tl; \
rh1 = rl1 = rh = rl = 0; \
for (i = 0; i < nw; i += 2) { \
MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i+2], \
pe64_to_cpup((mp)+i+1)+(kp)[i+3]); \
ADD128(rh1, rl1, th, tl); \
} \
} while (0)
#if (VMAC_NHBYTES >= 64) /* These versions do 64-bytes of message at a time */
#define nh_vmac_nhbytes(mp, kp, nw, rh, rl) \
do { \
int i; u64 th, tl; \
rh = rl = 0; \
for (i = 0; i < nw; i += 8) { \
MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+2], \
pe64_to_cpup((mp)+i+3)+(kp)[i+3]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+4], \
pe64_to_cpup((mp)+i+5)+(kp)[i+5]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+6], \
pe64_to_cpup((mp)+i+7)+(kp)[i+7]); \
ADD128(rh, rl, th, tl); \
} \
} while (0)
#define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh1, rl1) \
do { \
int i; u64 th, tl; \
rh1 = rl1 = rh = rl = 0; \
for (i = 0; i < nw; i += 8) { \
MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i], \
pe64_to_cpup((mp)+i+1)+(kp)[i+1]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i+2], \
pe64_to_cpup((mp)+i+1)+(kp)[i+3]); \
ADD128(rh1, rl1, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+2], \
pe64_to_cpup((mp)+i+3)+(kp)[i+3]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+4], \
pe64_to_cpup((mp)+i+3)+(kp)[i+5]); \
ADD128(rh1, rl1, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+4], \
pe64_to_cpup((mp)+i+5)+(kp)[i+5]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+6], \
pe64_to_cpup((mp)+i+5)+(kp)[i+7]); \
ADD128(rh1, rl1, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+6], \
pe64_to_cpup((mp)+i+7)+(kp)[i+7]); \
ADD128(rh, rl, th, tl); \
MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+8], \
pe64_to_cpup((mp)+i+7)+(kp)[i+9]); \
ADD128(rh1, rl1, th, tl); \
} \
} while (0)
#endif
#define poly_step(ah, al, kh, kl, mh, ml) \
do { \
u64 t1h, t1l, t2h, t2l, t3h, t3l, z = 0; \
/* compute ab*cd, put bd into result registers */ \
PMUL64(t3h, t3l, al, kh); \
PMUL64(t2h, t2l, ah, kl); \
PMUL64(t1h, t1l, ah, 2*kh); \
PMUL64(ah, al, al, kl); \
/* add 2 * ac to result */ \
ADD128(ah, al, t1h, t1l); \
/* add together ad + bc */ \
ADD128(t2h, t2l, t3h, t3l); \
/* now (ah,al), (t2l,2*t2h) need summing */ \
/* first add the high registers, carrying into t2h */ \
ADD128(t2h, ah, z, t2l); \
/* double t2h and add top bit of ah */ \
t2h = 2 * t2h + (ah >> 63); \
ah &= m63; \
/* now add the low registers */ \
ADD128(ah, al, mh, ml); \
ADD128(ah, al, z, t2h); \
} while (0)
#else /* ! CONFIG_64BIT */
#ifndef nh_16
#define nh_16(mp, kp, nw, rh, rl) \
do { \
u64 t1, t2, m1, m2, t; \
int i; \
rh = rl = t = 0; \
for (i = 0; i < nw; i += 2) { \
t1 = pe64_to_cpup(mp+i) + kp[i]; \
t2 = pe64_to_cpup(mp+i+1) + kp[i+1]; \
m2 = MUL32(t1 >> 32, t2); \
m1 = MUL32(t1, t2 >> 32); \
ADD128(rh, rl, MUL32(t1 >> 32, t2 >> 32), \
MUL32(t1, t2)); \
rh += (u64)(u32)(m1 >> 32) \
+ (u32)(m2 >> 32); \
t += (u64)(u32)m1 + (u32)m2; \
} \
ADD128(rh, rl, (t >> 32), (t << 32)); \
} while (0)
#endif
static void poly_step_func(u64 *ahi, u64 *alo,
const u64 *kh, const u64 *kl,
const u64 *mh, const u64 *ml)
{
#define a0 (*(((u32 *)alo)+INDEX_LOW))
#define a1 (*(((u32 *)alo)+INDEX_HIGH))
#define a2 (*(((u32 *)ahi)+INDEX_LOW))
#define a3 (*(((u32 *)ahi)+INDEX_HIGH))
#define k0 (*(((u32 *)kl)+INDEX_LOW))
#define k1 (*(((u32 *)kl)+INDEX_HIGH))
#define k2 (*(((u32 *)kh)+INDEX_LOW))
#define k3 (*(((u32 *)kh)+INDEX_HIGH))
u64 p, q, t;
u32 t2;
p = MUL32(a3, k3);
p += p;
p += *(u64 *)mh;
p += MUL32(a0, k2);
p += MUL32(a1, k1);
p += MUL32(a2, k0);
t = (u32)(p);
p >>= 32;
p += MUL32(a0, k3);
p += MUL32(a1, k2);
p += MUL32(a2, k1);
p += MUL32(a3, k0);
t |= ((u64)((u32)p & 0x7fffffff)) << 32;
p >>= 31;
p += (u64)(((u32 *)ml)[INDEX_LOW]);
p += MUL32(a0, k0);
q = MUL32(a1, k3);
q += MUL32(a2, k2);
q += MUL32(a3, k1);
q += q;
p += q;
t2 = (u32)(p);
p >>= 32;
p += (u64)(((u32 *)ml)[INDEX_HIGH]);
p += MUL32(a0, k1);
p += MUL32(a1, k0);
q = MUL32(a2, k3);
q += MUL32(a3, k2);
q += q;
p += q;
*(u64 *)(alo) = (p << 32) | t2;
p >>= 32;
*(u64 *)(ahi) = p + t;
#undef a0
#undef a1
#undef a2
#undef a3
#undef k0
#undef k1
#undef k2
#undef k3
}
#define poly_step(ah, al, kh, kl, mh, ml) \
poly_step_func(&(ah), &(al), &(kh), &(kl), &(mh), &(ml))
#endif /* end of specialized NH and poly definitions */
/* At least nh_16 is defined. Defined others as needed here */
#ifndef nh_16_2
#define nh_16_2(mp, kp, nw, rh, rl, rh2, rl2) \
do { \
nh_16(mp, kp, nw, rh, rl); \
nh_16(mp, ((kp)+2), nw, rh2, rl2); \
} while (0)
#endif
#ifndef nh_vmac_nhbytes
#define nh_vmac_nhbytes(mp, kp, nw, rh, rl) \
nh_16(mp, kp, nw, rh, rl)
#endif
#ifndef nh_vmac_nhbytes_2
#define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh2, rl2) \
do { \
nh_vmac_nhbytes(mp, kp, nw, rh, rl); \
nh_vmac_nhbytes(mp, ((kp)+2), nw, rh2, rl2); \
} while (0)
#endif
static u64 l3hash(u64 p1, u64 p2, u64 k1, u64 k2, u64 len)
{
u64 rh, rl, t, z = 0;
/* fully reduce (p1,p2)+(len,0) mod p127 */
t = p1 >> 63;
p1 &= m63;
ADD128(p1, p2, len, t);
/* At this point, (p1,p2) is at most 2^127+(len<<64) */
t = (p1 > m63) + ((p1 == m63) && (p2 == m64));
ADD128(p1, p2, z, t);
p1 &= m63;
/* compute (p1,p2)/(2^64-2^32) and (p1,p2)%(2^64-2^32) */
t = p1 + (p2 >> 32);
t += (t >> 32);
t += (u32)t > 0xfffffffeu;
p1 += (t >> 32);
p2 += (p1 << 32);
/* compute (p1+k1)%p64 and (p2+k2)%p64 */
p1 += k1;
p1 += (0 - (p1 < k1)) & 257;
p2 += k2;
p2 += (0 - (p2 < k2)) & 257;
/* compute (p1+k1)*(p2+k2)%p64 */
MUL64(rh, rl, p1, p2);
t = rh >> 56;
ADD128(t, rl, z, rh);
rh <<= 8;
ADD128(t, rl, z, rh);
t += t << 8;
rl += t;
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");
Reference in New Issue View Git Blame Copy Permalink