mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Linus Torvalds](/assets/img/avatar_default.png)
Pull crypto update from Herbert Xu: "API: - Add support for AEAD in simd - Add fuzz testing to testmgr - Add panic_on_fail module parameter to testmgr - Use per-CPU struct instead multiple variables in scompress - Change verify API for akcipher Algorithms: - Convert x86 AEAD algorithms over to simd - Forbid 2-key 3DES in FIPS mode - Add EC-RDSA (GOST 34.10) algorithm Drivers: - Set output IV with ctr-aes in crypto4xx - Set output IV in rockchip - Fix potential length overflow with hashing in sun4i-ss - Fix computation error with ctr in vmx - Add SM4 protected keys support in ccree - Remove long-broken mxc-scc driver - Add rfc4106(gcm(aes)) cipher support in cavium/nitrox" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (179 commits) crypto: ccree - use a proper le32 type for le32 val crypto: ccree - remove set but not used variable 'du_size' crypto: ccree - Make cc_sec_disable static crypto: ccree - fix spelling mistake "protedcted" -> "protected" crypto: caam/qi2 - generate hash keys in-place crypto: caam/qi2 - fix DMA mapping of stack memory crypto: caam/qi2 - fix zero-length buffer DMA mapping crypto: stm32/cryp - update to return iv_out crypto: stm32/cryp - remove request mutex protection crypto: stm32/cryp - add weak key check for DES crypto: atmel - remove set but not used variable 'alg_name' crypto: picoxcell - Use dev_get_drvdata() crypto: crypto4xx - get rid of redundant using_sd variable crypto: crypto4xx - use sync skcipher for fallback crypto: crypto4xx - fix cfb and ofb "overran dst buffer" issues crypto: crypto4xx - fix ctr-aes missing output IV crypto: ecrdsa - select ASN1 and OID_REGISTRY for EC-RDSA crypto: ux500 - use ccflags-y instead of CFLAGS_<basename>.o crypto: ccree - handle tee fips error during power management resume crypto: ccree - add function to handle cryptocell tee fips error ...
445 lines
11 KiB
C
445 lines
11 KiB
C
/* LRW: as defined by Cyril Guyot in
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* http://grouper.ieee.org/groups/1619/email/pdf00017.pdf
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*
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* Copyright (c) 2006 Rik Snel <rsnel@cube.dyndns.org>
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*
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* Based on ecb.c
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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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 of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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/* This implementation is checked against the test vectors in the above
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* document and by a test vector provided by Ken Buchanan at
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* http://www.mail-archive.com/stds-p1619@listserv.ieee.org/msg00173.html
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*
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* The test vectors are included in the testing module tcrypt.[ch] */
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <crypto/b128ops.h>
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#include <crypto/gf128mul.h>
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#define LRW_BLOCK_SIZE 16
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struct priv {
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struct crypto_skcipher *child;
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/*
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* optimizes multiplying a random (non incrementing, as at the
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* start of a new sector) value with key2, we could also have
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* used 4k optimization tables or no optimization at all. In the
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* latter case we would have to store key2 here
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*/
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struct gf128mul_64k *table;
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/*
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* stores:
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* key2*{ 0,0,...0,0,0,0,1 }, key2*{ 0,0,...0,0,0,1,1 },
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* key2*{ 0,0,...0,0,1,1,1 }, key2*{ 0,0,...0,1,1,1,1 }
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* key2*{ 0,0,...1,1,1,1,1 }, etc
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* needed for optimized multiplication of incrementing values
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* with key2
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*/
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be128 mulinc[128];
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};
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struct rctx {
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be128 t;
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struct skcipher_request subreq;
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};
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static inline void setbit128_bbe(void *b, int bit)
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{
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__set_bit(bit ^ (0x80 -
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#ifdef __BIG_ENDIAN
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BITS_PER_LONG
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#else
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BITS_PER_BYTE
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#endif
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), b);
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}
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static int setkey(struct crypto_skcipher *parent, const u8 *key,
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unsigned int keylen)
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{
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struct priv *ctx = crypto_skcipher_ctx(parent);
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struct crypto_skcipher *child = ctx->child;
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int err, bsize = LRW_BLOCK_SIZE;
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const u8 *tweak = key + keylen - bsize;
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be128 tmp = { 0 };
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int i;
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crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(child, key, keylen - bsize);
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crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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if (err)
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return err;
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if (ctx->table)
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gf128mul_free_64k(ctx->table);
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/* initialize multiplication table for Key2 */
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ctx->table = gf128mul_init_64k_bbe((be128 *)tweak);
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if (!ctx->table)
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return -ENOMEM;
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/* initialize optimization table */
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for (i = 0; i < 128; i++) {
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setbit128_bbe(&tmp, i);
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ctx->mulinc[i] = tmp;
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gf128mul_64k_bbe(&ctx->mulinc[i], ctx->table);
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}
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return 0;
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}
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/*
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* Returns the number of trailing '1' bits in the words of the counter, which is
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* represented by 4 32-bit words, arranged from least to most significant.
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* At the same time, increments the counter by one.
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*
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* For example:
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*
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* u32 counter[4] = { 0xFFFFFFFF, 0x1, 0x0, 0x0 };
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* int i = next_index(&counter);
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* // i == 33, counter == { 0x0, 0x2, 0x0, 0x0 }
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*/
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static int next_index(u32 *counter)
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{
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int i, res = 0;
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for (i = 0; i < 4; i++) {
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if (counter[i] + 1 != 0)
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return res + ffz(counter[i]++);
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counter[i] = 0;
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res += 32;
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}
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/*
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* If we get here, then x == 128 and we are incrementing the counter
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* from all ones to all zeros. This means we must return index 127, i.e.
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* the one corresponding to key2*{ 1,...,1 }.
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*/
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return 127;
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}
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/*
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* We compute the tweak masks twice (both before and after the ECB encryption or
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* decryption) to avoid having to allocate a temporary buffer and/or make
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* mutliple calls to the 'ecb(..)' instance, which usually would be slower than
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* just doing the next_index() calls again.
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*/
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static int xor_tweak(struct skcipher_request *req, bool second_pass)
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{
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const int bs = LRW_BLOCK_SIZE;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct priv *ctx = crypto_skcipher_ctx(tfm);
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struct rctx *rctx = skcipher_request_ctx(req);
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be128 t = rctx->t;
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struct skcipher_walk w;
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__be32 *iv;
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u32 counter[4];
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int err;
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if (second_pass) {
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req = &rctx->subreq;
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/* set to our TFM to enforce correct alignment: */
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skcipher_request_set_tfm(req, tfm);
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}
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err = skcipher_walk_virt(&w, req, false);
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if (err)
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return err;
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iv = (__be32 *)w.iv;
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counter[0] = be32_to_cpu(iv[3]);
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counter[1] = be32_to_cpu(iv[2]);
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counter[2] = be32_to_cpu(iv[1]);
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counter[3] = be32_to_cpu(iv[0]);
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while (w.nbytes) {
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unsigned int avail = w.nbytes;
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be128 *wsrc;
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be128 *wdst;
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wsrc = w.src.virt.addr;
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wdst = w.dst.virt.addr;
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do {
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be128_xor(wdst++, &t, wsrc++);
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/* T <- I*Key2, using the optimization
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* discussed in the specification */
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be128_xor(&t, &t, &ctx->mulinc[next_index(counter)]);
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} while ((avail -= bs) >= bs);
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if (second_pass && w.nbytes == w.total) {
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iv[0] = cpu_to_be32(counter[3]);
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iv[1] = cpu_to_be32(counter[2]);
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iv[2] = cpu_to_be32(counter[1]);
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iv[3] = cpu_to_be32(counter[0]);
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}
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err = skcipher_walk_done(&w, avail);
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}
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return err;
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}
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static int xor_tweak_pre(struct skcipher_request *req)
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{
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return xor_tweak(req, false);
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}
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static int xor_tweak_post(struct skcipher_request *req)
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{
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return xor_tweak(req, true);
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}
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static void crypt_done(struct crypto_async_request *areq, int err)
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{
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struct skcipher_request *req = areq->data;
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if (!err) {
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struct rctx *rctx = skcipher_request_ctx(req);
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rctx->subreq.base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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err = xor_tweak_post(req);
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}
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skcipher_request_complete(req, err);
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}
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static void init_crypt(struct skcipher_request *req)
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{
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struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
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struct rctx *rctx = skcipher_request_ctx(req);
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struct skcipher_request *subreq = &rctx->subreq;
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skcipher_request_set_tfm(subreq, ctx->child);
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skcipher_request_set_callback(subreq, req->base.flags, crypt_done, req);
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/* pass req->iv as IV (will be used by xor_tweak, ECB will ignore it) */
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skcipher_request_set_crypt(subreq, req->dst, req->dst,
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req->cryptlen, req->iv);
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/* calculate first value of T */
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memcpy(&rctx->t, req->iv, sizeof(rctx->t));
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/* T <- I*Key2 */
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gf128mul_64k_bbe(&rctx->t, ctx->table);
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}
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static int encrypt(struct skcipher_request *req)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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struct skcipher_request *subreq = &rctx->subreq;
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init_crypt(req);
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return xor_tweak_pre(req) ?:
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crypto_skcipher_encrypt(subreq) ?:
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xor_tweak_post(req);
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}
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static int decrypt(struct skcipher_request *req)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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struct skcipher_request *subreq = &rctx->subreq;
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init_crypt(req);
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return xor_tweak_pre(req) ?:
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crypto_skcipher_decrypt(subreq) ?:
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xor_tweak_post(req);
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}
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static int init_tfm(struct crypto_skcipher *tfm)
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{
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struct skcipher_instance *inst = skcipher_alg_instance(tfm);
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struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
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struct priv *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *cipher;
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cipher = crypto_spawn_skcipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(cipher) +
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sizeof(struct rctx));
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return 0;
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}
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static void exit_tfm(struct crypto_skcipher *tfm)
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{
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struct priv *ctx = crypto_skcipher_ctx(tfm);
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if (ctx->table)
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gf128mul_free_64k(ctx->table);
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crypto_free_skcipher(ctx->child);
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}
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static void free(struct skcipher_instance *inst)
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{
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crypto_drop_skcipher(skcipher_instance_ctx(inst));
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kfree(inst);
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}
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static int create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct crypto_skcipher_spawn *spawn;
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struct skcipher_instance *inst;
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struct crypto_attr_type *algt;
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struct skcipher_alg *alg;
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const char *cipher_name;
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char ecb_name[CRYPTO_MAX_ALG_NAME];
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int err;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return PTR_ERR(algt);
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if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
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return -EINVAL;
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cipher_name = crypto_attr_alg_name(tb[1]);
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if (IS_ERR(cipher_name))
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return PTR_ERR(cipher_name);
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inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
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if (!inst)
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return -ENOMEM;
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spawn = skcipher_instance_ctx(inst);
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crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
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err = crypto_grab_skcipher(spawn, cipher_name, 0,
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crypto_requires_sync(algt->type,
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algt->mask));
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if (err == -ENOENT) {
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err = -ENAMETOOLONG;
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if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
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cipher_name) >= CRYPTO_MAX_ALG_NAME)
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goto err_free_inst;
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err = crypto_grab_skcipher(spawn, ecb_name, 0,
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crypto_requires_sync(algt->type,
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algt->mask));
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}
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if (err)
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goto err_free_inst;
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alg = crypto_skcipher_spawn_alg(spawn);
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err = -EINVAL;
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if (alg->base.cra_blocksize != LRW_BLOCK_SIZE)
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goto err_drop_spawn;
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if (crypto_skcipher_alg_ivsize(alg))
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goto err_drop_spawn;
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err = crypto_inst_setname(skcipher_crypto_instance(inst), "lrw",
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&alg->base);
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if (err)
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goto err_drop_spawn;
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err = -EINVAL;
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cipher_name = alg->base.cra_name;
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/* Alas we screwed up the naming so we have to mangle the
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* cipher name.
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*/
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if (!strncmp(cipher_name, "ecb(", 4)) {
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unsigned len;
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len = strlcpy(ecb_name, cipher_name + 4, sizeof(ecb_name));
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if (len < 2 || len >= sizeof(ecb_name))
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goto err_drop_spawn;
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if (ecb_name[len - 1] != ')')
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goto err_drop_spawn;
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ecb_name[len - 1] = 0;
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if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
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"lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME) {
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err = -ENAMETOOLONG;
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goto err_drop_spawn;
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}
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} else
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goto err_drop_spawn;
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inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
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inst->alg.base.cra_priority = alg->base.cra_priority;
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inst->alg.base.cra_blocksize = LRW_BLOCK_SIZE;
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inst->alg.base.cra_alignmask = alg->base.cra_alignmask |
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(__alignof__(__be32) - 1);
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inst->alg.ivsize = LRW_BLOCK_SIZE;
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inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) +
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LRW_BLOCK_SIZE;
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inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) +
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LRW_BLOCK_SIZE;
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inst->alg.base.cra_ctxsize = sizeof(struct priv);
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inst->alg.init = init_tfm;
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inst->alg.exit = exit_tfm;
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inst->alg.setkey = setkey;
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inst->alg.encrypt = encrypt;
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inst->alg.decrypt = decrypt;
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inst->free = free;
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err = skcipher_register_instance(tmpl, inst);
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if (err)
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goto err_drop_spawn;
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out:
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return err;
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err_drop_spawn:
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crypto_drop_skcipher(spawn);
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err_free_inst:
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kfree(inst);
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goto out;
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}
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static struct crypto_template crypto_tmpl = {
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.name = "lrw",
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.create = create,
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.module = THIS_MODULE,
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};
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static int __init crypto_module_init(void)
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{
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return crypto_register_template(&crypto_tmpl);
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}
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static void __exit crypto_module_exit(void)
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{
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crypto_unregister_template(&crypto_tmpl);
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}
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subsys_initcall(crypto_module_init);
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module_exit(crypto_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("LRW block cipher mode");
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MODULE_ALIAS_CRYPTO("lrw");
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