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![Linus Torvalds](/assets/img/avatar_default.png)
Pull crypto updates from Herbert Xu: "Here is the crypto update for 4.12: API: - Add batch registration for acomp/scomp - Change acomp testing to non-unique compressed result - Extend algorithm name limit to 128 bytes - Require setkey before accept(2) in algif_aead Algorithms: - Add support for deflate rfc1950 (zlib) Drivers: - Add accelerated crct10dif for powerpc - Add crc32 in stm32 - Add sha384/sha512 in ccp - Add 3des/gcm(aes) for v5 devices in ccp - Add Queue Interface (QI) backend support in caam - Add new Exynos RNG driver - Add ThunderX ZIP driver - Add driver for hardware random generator on MT7623 SoC" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (101 commits) crypto: stm32 - Fix OF module alias information crypto: algif_aead - Require setkey before accept(2) crypto: scomp - add support for deflate rfc1950 (zlib) crypto: scomp - allow registration of multiple scomps crypto: ccp - Change ISR handler method for a v5 CCP crypto: ccp - Change ISR handler method for a v3 CCP crypto: crypto4xx - rename ce_ring_contol to ce_ring_control crypto: testmgr - Allow ecb(cipher_null) in FIPS mode Revert "crypto: arm64/sha - Add constant operand modifier to ASM_EXPORT" crypto: ccp - Disable interrupts early on unload crypto: ccp - Use only the relevant interrupt bits hwrng: mtk - Add driver for hardware random generator on MT7623 SoC dt-bindings: hwrng: Add Mediatek hardware random generator bindings crypto: crct10dif-vpmsum - Fix missing preempt_disable() crypto: testmgr - replace compression known answer test crypto: acomp - allow registration of multiple acomps hwrng: n2 - Use devm_kcalloc() in n2rng_probe() crypto: chcr - Fix error handling related to 'chcr_alloc_shash' padata: get_next is never NULL crypto: exynos - Add new Exynos RNG driver ...
618 lines
14 KiB
C
618 lines
14 KiB
C
/* XTS: as defined in IEEE1619/D16
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* http://grouper.ieee.org/groups/1619/email/pdf00086.pdf
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* (sector sizes which are not a multiple of 16 bytes are,
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* however currently unsupported)
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*
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* Copyright (c) 2007 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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#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/xts.h>
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#include <crypto/b128ops.h>
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#include <crypto/gf128mul.h>
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#define XTS_BUFFER_SIZE 128u
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struct priv {
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struct crypto_skcipher *child;
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struct crypto_cipher *tweak;
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};
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struct xts_instance_ctx {
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struct crypto_skcipher_spawn spawn;
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char name[CRYPTO_MAX_ALG_NAME];
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};
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struct rctx {
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le128 buf[XTS_BUFFER_SIZE / sizeof(le128)];
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le128 t;
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le128 *ext;
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struct scatterlist srcbuf[2];
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struct scatterlist dstbuf[2];
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struct scatterlist *src;
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struct scatterlist *dst;
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unsigned int left;
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struct skcipher_request subreq;
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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;
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struct crypto_cipher *tweak;
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int err;
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err = xts_verify_key(parent, key, keylen);
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if (err)
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return err;
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keylen /= 2;
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/* we need two cipher instances: one to compute the initial 'tweak'
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* by encrypting the IV (usually the 'plain' iv) and the other
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* one to encrypt and decrypt the data */
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/* tweak cipher, uses Key2 i.e. the second half of *key */
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tweak = ctx->tweak;
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crypto_cipher_clear_flags(tweak, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(tweak, crypto_skcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_cipher_setkey(tweak, key + keylen, keylen);
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crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(tweak) &
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CRYPTO_TFM_RES_MASK);
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if (err)
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return err;
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/* data cipher, uses Key1 i.e. the first half of *key */
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child = ctx->child;
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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);
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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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return err;
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}
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static int post_crypt(struct skcipher_request *req)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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le128 *buf = rctx->ext ?: rctx->buf;
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struct skcipher_request *subreq;
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const int bs = XTS_BLOCK_SIZE;
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struct skcipher_walk w;
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struct scatterlist *sg;
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unsigned offset;
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int err;
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subreq = &rctx->subreq;
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err = skcipher_walk_virt(&w, subreq, false);
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while (w.nbytes) {
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unsigned int avail = w.nbytes;
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le128 *wdst;
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wdst = w.dst.virt.addr;
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do {
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le128_xor(wdst, buf++, wdst);
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wdst++;
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} while ((avail -= bs) >= bs);
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err = skcipher_walk_done(&w, avail);
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}
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rctx->left -= subreq->cryptlen;
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if (err || !rctx->left)
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goto out;
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rctx->dst = rctx->dstbuf;
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scatterwalk_done(&w.out, 0, 1);
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sg = w.out.sg;
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offset = w.out.offset;
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if (rctx->dst != sg) {
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rctx->dst[0] = *sg;
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sg_unmark_end(rctx->dst);
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scatterwalk_crypto_chain(rctx->dst, sg_next(sg), 0, 2);
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}
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rctx->dst[0].length -= offset - sg->offset;
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rctx->dst[0].offset = offset;
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out:
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return err;
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}
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static int pre_crypt(struct skcipher_request *req)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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le128 *buf = rctx->ext ?: rctx->buf;
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struct skcipher_request *subreq;
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const int bs = XTS_BLOCK_SIZE;
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struct skcipher_walk w;
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struct scatterlist *sg;
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unsigned cryptlen;
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unsigned offset;
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bool more;
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int err;
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subreq = &rctx->subreq;
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cryptlen = subreq->cryptlen;
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more = rctx->left > cryptlen;
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if (!more)
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cryptlen = rctx->left;
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skcipher_request_set_crypt(subreq, rctx->src, rctx->dst,
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cryptlen, NULL);
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err = skcipher_walk_virt(&w, subreq, false);
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while (w.nbytes) {
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unsigned int avail = w.nbytes;
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le128 *wsrc;
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le128 *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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*buf++ = rctx->t;
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le128_xor(wdst++, &rctx->t, wsrc++);
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gf128mul_x_ble(&rctx->t, &rctx->t);
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} while ((avail -= bs) >= bs);
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err = skcipher_walk_done(&w, avail);
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}
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skcipher_request_set_crypt(subreq, rctx->dst, rctx->dst,
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cryptlen, NULL);
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if (err || !more)
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goto out;
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rctx->src = rctx->srcbuf;
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scatterwalk_done(&w.in, 0, 1);
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sg = w.in.sg;
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offset = w.in.offset;
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if (rctx->src != sg) {
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rctx->src[0] = *sg;
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sg_unmark_end(rctx->src);
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scatterwalk_crypto_chain(rctx->src, sg_next(sg), 0, 2);
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}
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rctx->src[0].length -= offset - sg->offset;
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rctx->src[0].offset = offset;
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out:
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return err;
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}
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static int init_crypt(struct skcipher_request *req, crypto_completion_t done)
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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;
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gfp_t gfp;
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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, done, req);
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gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
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GFP_ATOMIC;
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rctx->ext = NULL;
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subreq->cryptlen = XTS_BUFFER_SIZE;
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if (req->cryptlen > XTS_BUFFER_SIZE) {
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unsigned int n = min(req->cryptlen, (unsigned int)PAGE_SIZE);
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rctx->ext = kmalloc(n, gfp);
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if (rctx->ext)
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subreq->cryptlen = n;
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}
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rctx->src = req->src;
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rctx->dst = req->dst;
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rctx->left = req->cryptlen;
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/* calculate first value of T */
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crypto_cipher_encrypt_one(ctx->tweak, (u8 *)&rctx->t, req->iv);
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return 0;
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}
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static void exit_crypt(struct skcipher_request *req)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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rctx->left = 0;
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if (rctx->ext)
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kzfree(rctx->ext);
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}
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static int do_encrypt(struct skcipher_request *req, int err)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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struct skcipher_request *subreq;
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subreq = &rctx->subreq;
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while (!err && rctx->left) {
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err = pre_crypt(req) ?:
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crypto_skcipher_encrypt(subreq) ?:
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post_crypt(req);
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if (err == -EINPROGRESS ||
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(err == -EBUSY &&
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req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
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return err;
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}
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exit_crypt(req);
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return err;
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}
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static void encrypt_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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struct skcipher_request *subreq;
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struct rctx *rctx;
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rctx = skcipher_request_ctx(req);
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if (err == -EINPROGRESS) {
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if (rctx->left != req->cryptlen)
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return;
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goto out;
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}
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subreq = &rctx->subreq;
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subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
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err = do_encrypt(req, err ?: post_crypt(req));
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if (rctx->left)
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return;
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out:
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skcipher_request_complete(req, err);
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}
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static int encrypt(struct skcipher_request *req)
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{
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return do_encrypt(req, init_crypt(req, encrypt_done));
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}
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static int do_decrypt(struct skcipher_request *req, int err)
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{
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struct rctx *rctx = skcipher_request_ctx(req);
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struct skcipher_request *subreq;
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subreq = &rctx->subreq;
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while (!err && rctx->left) {
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err = pre_crypt(req) ?:
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crypto_skcipher_decrypt(subreq) ?:
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post_crypt(req);
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if (err == -EINPROGRESS ||
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(err == -EBUSY &&
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req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
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return err;
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}
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exit_crypt(req);
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return err;
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}
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static void decrypt_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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struct skcipher_request *subreq;
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struct rctx *rctx;
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rctx = skcipher_request_ctx(req);
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if (err == -EINPROGRESS) {
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if (rctx->left != req->cryptlen)
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return;
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goto out;
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}
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subreq = &rctx->subreq;
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subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
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err = do_decrypt(req, err ?: post_crypt(req));
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if (rctx->left)
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return;
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out:
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skcipher_request_complete(req, err);
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}
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static int decrypt(struct skcipher_request *req)
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{
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return do_decrypt(req, init_crypt(req, decrypt_done));
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}
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int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst,
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struct scatterlist *ssrc, unsigned int nbytes,
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struct xts_crypt_req *req)
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{
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const unsigned int bsize = XTS_BLOCK_SIZE;
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const unsigned int max_blks = req->tbuflen / bsize;
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struct blkcipher_walk walk;
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unsigned int nblocks;
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le128 *src, *dst, *t;
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le128 *t_buf = req->tbuf;
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int err, i;
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BUG_ON(max_blks < 1);
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blkcipher_walk_init(&walk, sdst, ssrc, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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nbytes = walk.nbytes;
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if (!nbytes)
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return err;
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nblocks = min(nbytes / bsize, max_blks);
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src = (le128 *)walk.src.virt.addr;
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dst = (le128 *)walk.dst.virt.addr;
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/* calculate first value of T */
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req->tweak_fn(req->tweak_ctx, (u8 *)&t_buf[0], walk.iv);
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i = 0;
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goto first;
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for (;;) {
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do {
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for (i = 0; i < nblocks; i++) {
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gf128mul_x_ble(&t_buf[i], t);
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first:
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t = &t_buf[i];
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/* PP <- T xor P */
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le128_xor(dst + i, t, src + i);
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}
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/* CC <- E(Key2,PP) */
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req->crypt_fn(req->crypt_ctx, (u8 *)dst,
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nblocks * bsize);
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/* C <- T xor CC */
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for (i = 0; i < nblocks; i++)
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le128_xor(dst + i, dst + i, &t_buf[i]);
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src += nblocks;
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dst += nblocks;
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nbytes -= nblocks * bsize;
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nblocks = min(nbytes / bsize, max_blks);
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} while (nblocks > 0);
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*(le128 *)walk.iv = *t;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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nbytes = walk.nbytes;
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if (!nbytes)
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break;
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nblocks = min(nbytes / bsize, max_blks);
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src = (le128 *)walk.src.virt.addr;
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dst = (le128 *)walk.dst.virt.addr;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(xts_crypt);
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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 xts_instance_ctx *ictx = skcipher_instance_ctx(inst);
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struct priv *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *child;
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struct crypto_cipher *tweak;
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child = crypto_spawn_skcipher(&ictx->spawn);
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if (IS_ERR(child))
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return PTR_ERR(child);
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ctx->child = child;
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tweak = crypto_alloc_cipher(ictx->name, 0, 0);
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if (IS_ERR(tweak)) {
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crypto_free_skcipher(ctx->child);
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return PTR_ERR(tweak);
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}
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ctx->tweak = tweak;
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crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(child) +
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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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crypto_free_skcipher(ctx->child);
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crypto_free_cipher(ctx->tweak);
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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 skcipher_instance *inst;
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struct crypto_attr_type *algt;
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struct xts_instance_ctx *ctx;
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struct skcipher_alg *alg;
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const char *cipher_name;
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u32 mask;
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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(*ctx), GFP_KERNEL);
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if (!inst)
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return -ENOMEM;
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ctx = skcipher_instance_ctx(inst);
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|
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crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst));
|
|
|
|
mask = crypto_requires_off(algt->type, algt->mask,
|
|
CRYPTO_ALG_NEED_FALLBACK |
|
|
CRYPTO_ALG_ASYNC);
|
|
|
|
err = crypto_grab_skcipher(&ctx->spawn, cipher_name, 0, mask);
|
|
if (err == -ENOENT) {
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(ctx->name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
|
|
cipher_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
err = crypto_grab_skcipher(&ctx->spawn, ctx->name, 0, mask);
|
|
}
|
|
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_skcipher_spawn_alg(&ctx->spawn);
|
|
|
|
err = -EINVAL;
|
|
if (alg->base.cra_blocksize != XTS_BLOCK_SIZE)
|
|
goto err_drop_spawn;
|
|
|
|
if (crypto_skcipher_alg_ivsize(alg))
|
|
goto err_drop_spawn;
|
|
|
|
err = crypto_inst_setname(skcipher_crypto_instance(inst), "xts",
|
|
&alg->base);
|
|
if (err)
|
|
goto err_drop_spawn;
|
|
|
|
err = -EINVAL;
|
|
cipher_name = alg->base.cra_name;
|
|
|
|
/* Alas we screwed up the naming so we have to mangle the
|
|
* cipher name.
|
|
*/
|
|
if (!strncmp(cipher_name, "ecb(", 4)) {
|
|
unsigned len;
|
|
|
|
len = strlcpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
|
|
if (len < 2 || len >= sizeof(ctx->name))
|
|
goto err_drop_spawn;
|
|
|
|
if (ctx->name[len - 1] != ')')
|
|
goto err_drop_spawn;
|
|
|
|
ctx->name[len - 1] = 0;
|
|
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"xts(%s)", ctx->name) >= CRYPTO_MAX_ALG_NAME)
|
|
return -ENAMETOOLONG;
|
|
} else
|
|
goto err_drop_spawn;
|
|
|
|
inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
|
|
inst->alg.base.cra_priority = alg->base.cra_priority;
|
|
inst->alg.base.cra_blocksize = XTS_BLOCK_SIZE;
|
|
inst->alg.base.cra_alignmask = alg->base.cra_alignmask |
|
|
(__alignof__(u64) - 1);
|
|
|
|
inst->alg.ivsize = XTS_BLOCK_SIZE;
|
|
inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) * 2;
|
|
inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) * 2;
|
|
|
|
inst->alg.base.cra_ctxsize = sizeof(struct priv);
|
|
|
|
inst->alg.init = init_tfm;
|
|
inst->alg.exit = exit_tfm;
|
|
|
|
inst->alg.setkey = setkey;
|
|
inst->alg.encrypt = encrypt;
|
|
inst->alg.decrypt = decrypt;
|
|
|
|
inst->free = free;
|
|
|
|
err = skcipher_register_instance(tmpl, inst);
|
|
if (err)
|
|
goto err_drop_spawn;
|
|
|
|
out:
|
|
return err;
|
|
|
|
err_drop_spawn:
|
|
crypto_drop_skcipher(&ctx->spawn);
|
|
err_free_inst:
|
|
kfree(inst);
|
|
goto out;
|
|
}
|
|
|
|
static struct crypto_template crypto_tmpl = {
|
|
.name = "xts",
|
|
.create = create,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init crypto_module_init(void)
|
|
{
|
|
return crypto_register_template(&crypto_tmpl);
|
|
}
|
|
|
|
static void __exit crypto_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&crypto_tmpl);
|
|
}
|
|
|
|
module_init(crypto_module_init);
|
|
module_exit(crypto_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("XTS block cipher mode");
|
|
MODULE_ALIAS_CRYPTO("xts");
|