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-rw-r--r--crypto/vmac.c716
1 files changed, 0 insertions, 716 deletions
diff --git a/crypto/vmac.c b/crypto/vmac.c
deleted file mode 100644
index df76a816cfb2..000000000000
--- a/crypto/vmac.c
+++ /dev/null
@@ -1,716 +0,0 @@
-/*
- * Modified to interface to the Linux kernel
- * Copyright (c) 2009, Intel Corporation.
- *
- * 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.
- */
-
-/* --------------------------------------------------------------------------
- * 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.
- * Please send bug reports to the authors.
- * Last modified: 17 APR 08, 1700 PDT
- * ----------------------------------------------------------------------- */
-
-#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/vmac.h>
-#include <crypto/internal/hash.h>
-
-/*
- * 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 void vhash_abort(struct vmac_ctx *ctx)
-{
- ctx->polytmp[0] = ctx->polykey[0] ;
- ctx->polytmp[1] = ctx->polykey[1] ;
- ctx->first_block_processed = 0;
-}
-
-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;
-}
-
-static void vhash_update(const unsigned char *m,
- unsigned int mbytes, /* Pos multiple of VMAC_NHBYTES */
- struct vmac_ctx *ctx)
-{
- u64 rh, rl, *mptr;
- const u64 *kptr = (u64 *)ctx->nhkey;
- int i;
- u64 ch, cl;
- u64 pkh = ctx->polykey[0];
- u64 pkl = ctx->polykey[1];
-
- if (!mbytes)
- return;
-
- BUG_ON(mbytes % VMAC_NHBYTES);
-
- mptr = (u64 *)m;
- i = mbytes / VMAC_NHBYTES; /* Must be non-zero */
-
- ch = ctx->polytmp[0];
- cl = ctx->polytmp[1];
-
- if (!ctx->first_block_processed) {
- ctx->first_block_processed = 1;
- nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
- rh &= m62;
- ADD128(ch, cl, rh, rl);
- mptr += (VMAC_NHBYTES/sizeof(u64));
- i--;
- }
-
- 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));
- }
-
- ctx->polytmp[0] = ch;
- ctx->polytmp[1] = cl;
-}
-
-static u64 vhash(unsigned char m[], unsigned int mbytes,
- 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");
generated by cgit (git 2.34.1) at 2025-12-25 04:53:40 +0000