1 files changed, 380 insertions, 127 deletions

diff --git a/crypto/lrw.c b/crypto/lrw.c
index 6f9908a..ecd8474 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -17,7 +17,8 @@
  *
  * The test vectors are included in the testing module tcrypt.[ch] */
 
-#include <crypto/algapi.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -29,11 +30,30 @@
 #include <crypto/gf128mul.h>
 #include <crypto/lrw.h>
 
+#define LRW_BUFFER_SIZE 128u
+
 struct priv {
-	struct crypto_cipher *child;
+	struct crypto_skcipher *child;
 	struct lrw_table_ctx table;
 };
 
+struct rctx {
+	be128 buf[LRW_BUFFER_SIZE / sizeof(be128)];
+
+	be128 t;
+
+	be128 *ext;
+
+	struct scatterlist srcbuf[2];
+	struct scatterlist dstbuf[2];
+	struct scatterlist *src;
+	struct scatterlist *dst;
+
+	unsigned int left;
+
+	struct skcipher_request subreq;
+};
+
 static inline void setbit128_bbe(void *b, int bit)
 {
 	__set_bit(bit ^ (0x80 -
@@ -76,32 +96,26 @@ void lrw_free_table(struct lrw_table_ctx *ctx)
 }
 EXPORT_SYMBOL_GPL(lrw_free_table);
 
-static int setkey(struct crypto_tfm *parent, const u8 *key,
+static int setkey(struct crypto_skcipher *parent, const u8 *key,
 		  unsigned int keylen)
 {
-	struct priv *ctx = crypto_tfm_ctx(parent);
-	struct crypto_cipher *child = ctx->child;
+	struct priv *ctx = crypto_skcipher_ctx(parent);
+	struct crypto_skcipher *child = ctx->child;
 	int err, bsize = LRW_BLOCK_SIZE;
 	const u8 *tweak = key + keylen - bsize;
 
-	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
-	crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
-				       CRYPTO_TFM_REQ_MASK);
-	err = crypto_cipher_setkey(child, key, keylen - bsize);
+	crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
+					 CRYPTO_TFM_REQ_MASK);
+	err = crypto_skcipher_setkey(child, key, keylen - bsize);
+	crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
+					  CRYPTO_TFM_RES_MASK);
 	if (err)
 		return err;
-	crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
-				     CRYPTO_TFM_RES_MASK);
 
 	return lrw_init_table(&ctx->table, tweak);
 }
 
-struct sinfo {
-	be128 t;
-	struct crypto_tfm *tfm;
-	void (*fn)(struct crypto_tfm *, u8 *, const u8 *);
-};
-
 static inline void inc(be128 *iv)
 {
 	be64_add_cpu(&iv->b, 1);
@@ -109,13 +123,6 @@ static inline void inc(be128 *iv)
 		be64_add_cpu(&iv->a, 1);
 }
 
-static inline void lrw_round(struct sinfo *s, void *dst, const void *src)
-{
-	be128_xor(dst, &s->t, src);		/* PP <- T xor P */
-	s->fn(s->tfm, dst, dst);		/* CC <- E(Key2,PP) */
-	be128_xor(dst, dst, &s->t);		/* C <- T xor CC */
-}
-
 /* this returns the number of consequative 1 bits starting
  * from the right, get_index128(00 00 00 00 00 00 ... 00 00 10 FB) = 2 */
 static inline int get_index128(be128 *block)
@@ -135,83 +142,263 @@ static inline int get_index128(be128 *block)
 	return x;
 }
 
-static int crypt(struct blkcipher_desc *d,
-		 struct blkcipher_walk *w, struct priv *ctx,
-		 void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
+static int post_crypt(struct skcipher_request *req)
 {
+	struct rctx *rctx = skcipher_request_ctx(req);
+	be128 *buf = rctx->ext ?: rctx->buf;
+	struct skcipher_request *subreq;
+	const int bs = LRW_BLOCK_SIZE;
+	struct skcipher_walk w;
+	struct scatterlist *sg;
+	unsigned offset;
 	int err;
-	unsigned int avail;
+
+	subreq = &rctx->subreq;
+	err = skcipher_walk_virt(&w, subreq, false);
+
+	while (w.nbytes) {
+		unsigned int avail = w.nbytes;
+		be128 *wdst;
+
+		wdst = w.dst.virt.addr;
+
+		do {
+			be128_xor(wdst, buf++, wdst);
+			wdst++;
+		} while ((avail -= bs) >= bs);
+
+		err = skcipher_walk_done(&w, avail);
+	}
+
+	rctx->left -= subreq->cryptlen;
+
+	if (err || !rctx->left)
+		goto out;
+
+	rctx->dst = rctx->dstbuf;
+
+	scatterwalk_done(&w.out, 0, 1);
+	sg = w.out.sg;
+	offset = w.out.offset;
+
+	if (rctx->dst != sg) {
+		rctx->dst[0] = *sg;
+		sg_unmark_end(rctx->dst);
+		scatterwalk_crypto_chain(rctx->dst, sg_next(sg), 0, 2);
+	}
+	rctx->dst[0].length -= offset - sg->offset;
+	rctx->dst[0].offset = offset;
+
+out:
+	return err;
+}
+
+static int pre_crypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct rctx *rctx = skcipher_request_ctx(req);
+	struct priv *ctx = crypto_skcipher_ctx(tfm);
+	be128 *buf = rctx->ext ?: rctx->buf;
+	struct skcipher_request *subreq;
 	const int bs = LRW_BLOCK_SIZE;
-	struct sinfo s = {
-		.tfm = crypto_cipher_tfm(ctx->child),
-		.fn = fn
-	};
+	struct skcipher_walk w;
+	struct scatterlist *sg;
+	unsigned cryptlen;
+	unsigned offset;
 	be128 *iv;
-	u8 *wsrc;
-	u8 *wdst;
+	bool more;
+	int err;
 
-	err = blkcipher_walk_virt(d, w);
-	if (!(avail = w->nbytes))
-		return err;
+	subreq = &rctx->subreq;
+	skcipher_request_set_tfm(subreq, tfm);
 
-	wsrc = w->src.virt.addr;
-	wdst = w->dst.virt.addr;
+	cryptlen = subreq->cryptlen;
+	more = rctx->left > cryptlen;
+	if (!more)
+		cryptlen = rctx->left;
 
-	/* calculate first value of T */
-	iv = (be128 *)w->iv;
-	s.t = *iv;
+	skcipher_request_set_crypt(subreq, rctx->src, rctx->dst,
+				   cryptlen, req->iv);
 
-	/* T <- I*Key2 */
-	gf128mul_64k_bbe(&s.t, ctx->table.table);
+	err = skcipher_walk_virt(&w, subreq, false);
+	iv = w.iv;
 
-	goto first;
+	while (w.nbytes) {
+		unsigned int avail = w.nbytes;
+		be128 *wsrc;
+		be128 *wdst;
+
+		wsrc = w.src.virt.addr;
+		wdst = w.dst.virt.addr;
 
-	for (;;) {
 		do {
+			*buf++ = rctx->t;
+			be128_xor(wdst++, &rctx->t, wsrc++);
+
 			/* T <- I*Key2, using the optimization
 			 * discussed in the specification */
-			be128_xor(&s.t, &s.t,
+			be128_xor(&rctx->t, &rctx->t,
 				  &ctx->table.mulinc[get_index128(iv)]);
 			inc(iv);
+		} while ((avail -= bs) >= bs);
 
-first:
-			lrw_round(&s, wdst, wsrc);
+		err = skcipher_walk_done(&w, avail);
+	}
 
-			wsrc += bs;
-			wdst += bs;
-		} while ((avail -= bs) >= bs);
+	skcipher_request_set_tfm(subreq, ctx->child);
+	skcipher_request_set_crypt(subreq, rctx->dst, rctx->dst,
+				   cryptlen, NULL);
 
-		err = blkcipher_walk_done(d, w, avail);
-		if (!(avail = w->nbytes))
-			break;
+	if (err || !more)
+		goto out;
+
+	rctx->src = rctx->srcbuf;
+
+	scatterwalk_done(&w.in, 0, 1);
+	sg = w.in.sg;
+	offset = w.in.offset;
+
+	if (rctx->src != sg) {
+		rctx->src[0] = *sg;
+		sg_unmark_end(rctx->src);
+		scatterwalk_crypto_chain(rctx->src, sg_next(sg), 0, 2);
+	}
+	rctx->src[0].length -= offset - sg->offset;
+	rctx->src[0].offset = offset;
+
+out:
+	return err;
+}
+
+static int init_crypt(struct skcipher_request *req, crypto_completion_t done)
+{
+	struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	struct rctx *rctx = skcipher_request_ctx(req);
+	struct skcipher_request *subreq;
+	gfp_t gfp;
+
+	subreq = &rctx->subreq;
+	skcipher_request_set_callback(subreq, req->base.flags, done, req);
+
+	gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
+							   GFP_ATOMIC;
+	rctx->ext = NULL;
+
+	subreq->cryptlen = LRW_BUFFER_SIZE;
+	if (req->cryptlen > LRW_BUFFER_SIZE) {
+		subreq->cryptlen = min(req->cryptlen, (unsigned)PAGE_SIZE);
+		rctx->ext = kmalloc(subreq->cryptlen, gfp);
+	}
+
+	rctx->src = req->src;
+	rctx->dst = req->dst;
+	rctx->left = req->cryptlen;
+
+	/* calculate first value of T */
+	memcpy(&rctx->t, req->iv, sizeof(rctx->t));
+
+	/* T <- I*Key2 */
+	gf128mul_64k_bbe(&rctx->t, ctx->table.table);
 
-		wsrc = w->src.virt.addr;
-		wdst = w->dst.virt.addr;
+	return 0;
+}
+
+static void exit_crypt(struct skcipher_request *req)
+{
+	struct rctx *rctx = skcipher_request_ctx(req);
+
+	rctx->left = 0;
+
+	if (rctx->ext)
+		kfree(rctx->ext);
+}
+
+static int do_encrypt(struct skcipher_request *req, int err)
+{
+	struct rctx *rctx = skcipher_request_ctx(req);
+	struct skcipher_request *subreq;
+
+	subreq = &rctx->subreq;
+
+	while (!err && rctx->left) {
+		err = pre_crypt(req) ?:
+		      crypto_skcipher_encrypt(subreq) ?:
+		      post_crypt(req);
+
+		if (err == -EINPROGRESS ||
+		    (err == -EBUSY &&
+		     req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
+			return err;
 	}
 
+	exit_crypt(req);
 	return err;
 }
 
-static int encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		   struct scatterlist *src, unsigned int nbytes)
+static void encrypt_done(struct crypto_async_request *areq, int err)
+{
+	struct skcipher_request *req = areq->data;
+	struct skcipher_request *subreq;
+	struct rctx *rctx;
+
+	rctx = skcipher_request_ctx(req);
+	subreq = &rctx->subreq;
+	subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
+
+	err = do_encrypt(req, err ?: post_crypt(req));
+	if (rctx->left)
+		return;
+
+	skcipher_request_complete(req, err);
+}
+
+static int encrypt(struct skcipher_request *req)
+{
+	return do_encrypt(req, init_crypt(req, encrypt_done));
+}
+
+static int do_decrypt(struct skcipher_request *req, int err)
 {
-	struct priv *ctx = crypto_blkcipher_ctx(desc->tfm);
-	struct blkcipher_walk w;
+	struct rctx *rctx = skcipher_request_ctx(req);
+	struct skcipher_request *subreq;
+
+	subreq = &rctx->subreq;
+
+	while (!err && rctx->left) {
+		err = pre_crypt(req) ?:
+		      crypto_skcipher_decrypt(subreq) ?:
+		      post_crypt(req);
+
+		if (err == -EINPROGRESS ||
+		    (err == -EBUSY &&
+		     req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
+			return err;
+	}
 
-	blkcipher_walk_init(&w, dst, src, nbytes);
-	return crypt(desc, &w, ctx,
-		     crypto_cipher_alg(ctx->child)->cia_encrypt);
+	exit_crypt(req);
+	return err;
 }
 
-static int decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		   struct scatterlist *src, unsigned int nbytes)
+static void decrypt_done(struct crypto_async_request *areq, int err)
 {
-	struct priv *ctx = crypto_blkcipher_ctx(desc->tfm);
-	struct blkcipher_walk w;
+	struct skcipher_request *req = areq->data;
+	struct skcipher_request *subreq;
+	struct rctx *rctx;
+
+	rctx = skcipher_request_ctx(req);
+	subreq = &rctx->subreq;
+	subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
+
+	err = do_decrypt(req, err ?: post_crypt(req));
+	if (rctx->left)
+		return;
 
-	blkcipher_walk_init(&w, dst, src, nbytes);
-	return crypt(desc, &w, ctx,
-		     crypto_cipher_alg(ctx->child)->cia_decrypt);
+	skcipher_request_complete(req, err);
+}
+
+static int decrypt(struct skcipher_request *req)
+{
+	return do_decrypt(req, init_crypt(req, decrypt_done));
 }
 
 int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst,
@@ -293,95 +480,161 @@ first:
 }
 EXPORT_SYMBOL_GPL(lrw_crypt);
 
-static int init_tfm(struct crypto_tfm *tfm)
+static int init_tfm(struct crypto_skcipher *tfm)
 {
-	struct crypto_cipher *cipher;
-	struct crypto_instance *inst = (void *)tfm->__crt_alg;
-	struct crypto_spawn *spawn = crypto_instance_ctx(inst);
-	struct priv *ctx = crypto_tfm_ctx(tfm);
-	u32 *flags = &tfm->crt_flags;
+	struct skcipher_instance *inst = skcipher_alg_instance(tfm);
+	struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
+	struct priv *ctx = crypto_skcipher_ctx(tfm);
+	struct crypto_skcipher *cipher;
 
-	cipher = crypto_spawn_cipher(spawn);
+	cipher = crypto_spawn_skcipher(spawn);
 	if (IS_ERR(cipher))
 		return PTR_ERR(cipher);
 
-	if (crypto_cipher_blocksize(cipher) != LRW_BLOCK_SIZE) {
-		*flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
-		crypto_free_cipher(cipher);
-		return -EINVAL;
-	}
-
 	ctx->child = cipher;
+
+	crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(cipher) +
+					 sizeof(struct rctx));
+
 	return 0;
 }
 
-static void exit_tfm(struct crypto_tfm *tfm)
+static void exit_tfm(struct crypto_skcipher *tfm)
 {
-	struct priv *ctx = crypto_tfm_ctx(tfm);
+	struct priv *ctx = crypto_skcipher_ctx(tfm);
 
 	lrw_free_table(&ctx->table);
-	crypto_free_cipher(ctx->child);
+	crypto_free_skcipher(ctx->child);
+}
+
+static void free(struct skcipher_instance *inst)
+{
+	crypto_drop_skcipher(skcipher_instance_ctx(inst));
+	kfree(inst);
 }
 
-static struct crypto_instance *alloc(struct rtattr **tb)
+static int create(struct crypto_template *tmpl, struct rtattr **tb)
 {
-	struct crypto_instance *inst;
-	struct crypto_alg *alg;
+	struct crypto_skcipher_spawn *spawn;
+	struct skcipher_instance *inst;
+	struct crypto_attr_type *algt;
+	struct skcipher_alg *alg;
+	const char *cipher_name;
+	char ecb_name[CRYPTO_MAX_ALG_NAME];
 	int err;
 
-	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return PTR_ERR(algt);
+
+	if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
+		return -EINVAL;
+
+	cipher_name = crypto_attr_alg_name(tb[1]);
+	if (IS_ERR(cipher_name))
+		return PTR_ERR(cipher_name);
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+
+	spawn = skcipher_instance_ctx(inst);
+
+	crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
+	err = crypto_grab_skcipher(spawn, cipher_name, 0,
+				   crypto_requires_sync(algt->type,
+							algt->mask));
+	if (err == -ENOENT) {
+		err = -ENAMETOOLONG;
+		if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
+			     cipher_name) >= CRYPTO_MAX_ALG_NAME)
+			goto err_free_inst;
+
+		err = crypto_grab_skcipher(spawn, ecb_name, 0,
+					   crypto_requires_sync(algt->type,
+								algt->mask));
+	}
+
 	if (err)
-		return ERR_PTR(err);
+		goto err_free_inst;
 
-	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
-				  CRYPTO_ALG_TYPE_MASK);
-	if (IS_ERR(alg))
-		return ERR_CAST(alg);
+	alg = crypto_skcipher_spawn_alg(spawn);
 
-	inst = crypto_alloc_instance("lrw", alg);
-	if (IS_ERR(inst))
-		goto out_put_alg;
+	err = -EINVAL;
+	if (alg->base.cra_blocksize != LRW_BLOCK_SIZE)
+		goto err_drop_spawn;
 
-	inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
-	inst->alg.cra_priority = alg->cra_priority;
-	inst->alg.cra_blocksize = alg->cra_blocksize;
+	if (crypto_skcipher_alg_ivsize(alg))
+		goto err_drop_spawn;
 
-	if (alg->cra_alignmask < 7) inst->alg.cra_alignmask = 7;
-	else inst->alg.cra_alignmask = alg->cra_alignmask;
-	inst->alg.cra_type = &crypto_blkcipher_type;
+	err = crypto_inst_setname(skcipher_crypto_instance(inst), "lrw",
+				  &alg->base);
+	if (err)
+		goto err_drop_spawn;
 
-	if (!(alg->cra_blocksize % 4))
-		inst->alg.cra_alignmask |= 3;
-	inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
-	inst->alg.cra_blkcipher.min_keysize =
-		alg->cra_cipher.cia_min_keysize + alg->cra_blocksize;
-	inst->alg.cra_blkcipher.max_keysize =
-		alg->cra_cipher.cia_max_keysize + alg->cra_blocksize;
+	err = -EINVAL;
+	cipher_name = alg->base.cra_name;
 
-	inst->alg.cra_ctxsize = sizeof(struct priv);
+	/* Alas we screwed up the naming so we have to mangle the
+	 * cipher name.
+	 */
+	if (!strncmp(cipher_name, "ecb(", 4)) {
+		unsigned len;
 
-	inst->alg.cra_init = init_tfm;
-	inst->alg.cra_exit = exit_tfm;
+		len = strlcpy(ecb_name, cipher_name + 4, sizeof(ecb_name));
+		if (len < 2 || len >= sizeof(ecb_name))
+			goto err_drop_spawn;
 
-	inst->alg.cra_blkcipher.setkey = setkey;
-	inst->alg.cra_blkcipher.encrypt = encrypt;
-	inst->alg.cra_blkcipher.decrypt = decrypt;
+		if (ecb_name[len - 1] != ')')
+			goto err_drop_spawn;
 
-out_put_alg:
-	crypto_mod_put(alg);
-	return inst;
-}
+		ecb_name[len - 1] = 0;
 
-static void free(struct crypto_instance *inst)
-{
-	crypto_drop_spawn(crypto_instance_ctx(inst));
+		if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
+			     "lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME)
+			return -ENAMETOOLONG;
+	}
+
+	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 = LRW_BLOCK_SIZE;
+	inst->alg.base.cra_alignmask = alg->base.cra_alignmask |
+				       (__alignof__(u64) - 1);
+
+	inst->alg.ivsize = LRW_BLOCK_SIZE;
+	inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) +
+				LRW_BLOCK_SIZE;
+	inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) +
+				LRW_BLOCK_SIZE;
+
+	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(spawn);
+err_free_inst:
 	kfree(inst);
+	goto out;
 }
 
 static struct crypto_template crypto_tmpl = {
 	.name = "lrw",
-	.alloc = alloc,
-	.free = free,
+	.create = create,
 	.module = THIS_MODULE,
 };