/* * Asynchronous block chaining cipher operations. * * This is the asynchronous version of blkcipher.c indicating completion * via a callback. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <crypto/internal/skcipher.h>#include <linux/err.h>#include <linux/kernel.h>#include <linux/slab.h>#include <linux/seq_file.h>#include <linux/cryptouser.h>#include <linux/compiler.h>#include <net/netlink.h> #include <crypto/scatterwalk.h> #include "internal.h" struct ablkcipher_buffer {	struct list_head	entry;	struct scatter_walk	dst;	unsigned int		len;	void			*data;}; enum {	ABLKCIPHER_WALK_SLOW = 1 << 0,}; static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p){	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);} void __ablkcipher_walk_complete(struct ablkcipher_walk *walk){	struct ablkcipher_buffer *p, *tmp; 	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {		ablkcipher_buffer_write(p);		list_del(&p->entry);		kfree(p);	}}EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,					  struct ablkcipher_buffer *p){	p->dst = walk->out;	list_add_tail(&p->entry, &walk->buffers);} /* Get a spot of the specified length that does not straddle a page. * The caller needs to ensure that there is enough space for this operation. */static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len){	u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); 	return max(start, end_page);} static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,						unsigned int bsize){	unsigned int n = bsize; 	for (;;) {		unsigned int len_this_page = scatterwalk_pagelen(&walk->out); 		if (len_this_page > n)			len_this_page = n;		scatterwalk_advance(&walk->out, n);		if (n == len_this_page)			break;		n -= len_this_page;		scatterwalk_start(&walk->out, sg_next(walk->out.sg));	} 	return bsize;} static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,						unsigned int n){	scatterwalk_advance(&walk->in, n);	scatterwalk_advance(&walk->out, n); 	return n;} static int ablkcipher_walk_next(struct ablkcipher_request *req,				struct ablkcipher_walk *walk); int ablkcipher_walk_done(struct ablkcipher_request *req,			 struct ablkcipher_walk *walk, int err){	struct crypto_tfm *tfm = req->base.tfm;	unsigned int nbytes = 0; 	if (likely(err >= 0)) {		unsigned int n = walk->nbytes - err; 		if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))			n = ablkcipher_done_fast(walk, n);		else if (WARN_ON(err)) {			err = -EINVAL;			goto err;		} else			n = ablkcipher_done_slow(walk, n); 		nbytes = walk->total - n;		err = 0;	} 	scatterwalk_done(&walk->in, 0, nbytes);	scatterwalk_done(&walk->out, 1, nbytes); err:	walk->total = nbytes;	walk->nbytes = nbytes; 	if (nbytes) {		crypto_yield(req->base.flags);		return ablkcipher_walk_next(req, walk);	} 	if (walk->iv != req->info)		memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);	kfree(walk->iv_buffer); 	return err;}EXPORT_SYMBOL_GPL(ablkcipher_walk_done); static inline int ablkcipher_next_slow(struct ablkcipher_request *req,				       struct ablkcipher_walk *walk,				       unsigned int bsize,				       unsigned int alignmask,				       void **src_p, void **dst_p){	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);	struct ablkcipher_buffer *p;	void *src, *dst, *base;	unsigned int n; 	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);	n += (aligned_bsize * 3 - (alignmask + 1) +	      (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); 	p = kmalloc(n, GFP_ATOMIC);	if (!p)		return ablkcipher_walk_done(req, walk, -ENOMEM); 	base = p + 1; 	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);	src = dst = ablkcipher_get_spot(dst, bsize); 	p->len = bsize;	p->data = dst; 	scatterwalk_copychunks(src, &walk->in, bsize, 0); 	ablkcipher_queue_write(walk, p); 	walk->nbytes = bsize;	walk->flags |= ABLKCIPHER_WALK_SLOW; 	*src_p = src;	*dst_p = dst; 	return 0;} static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,				     struct crypto_tfm *tfm,				     unsigned int alignmask){	unsigned bs = walk->blocksize;	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;	unsigned aligned_bs = ALIGN(bs, alignmask + 1);	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -			    (alignmask + 1);	u8 *iv; 	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);	if (!walk->iv_buffer)		return -ENOMEM; 	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;	iv = ablkcipher_get_spot(iv, ivsize); 	walk->iv = memcpy(iv, walk->iv, ivsize);	return 0;} static inline int ablkcipher_next_fast(struct ablkcipher_request *req,				       struct ablkcipher_walk *walk){	walk->src.page = scatterwalk_page(&walk->in);	walk->src.offset = offset_in_page(walk->in.offset);	walk->dst.page = scatterwalk_page(&walk->out);	walk->dst.offset = offset_in_page(walk->out.offset); 	return 0;} static int ablkcipher_walk_next(struct ablkcipher_request *req,				struct ablkcipher_walk *walk){	struct crypto_tfm *tfm = req->base.tfm;	unsigned int alignmask, bsize, n;	void *src, *dst;	int err; 	alignmask = crypto_tfm_alg_alignmask(tfm);	n = walk->total;	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {		req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;		return ablkcipher_walk_done(req, walk, -EINVAL);	} 	walk->flags &= ~ABLKCIPHER_WALK_SLOW;	src = dst = NULL; 	bsize = min(walk->blocksize, n);	n = scatterwalk_clamp(&walk->in, n);	n = scatterwalk_clamp(&walk->out, n); 	if (n < bsize ||	    !scatterwalk_aligned(&walk->in, alignmask) ||	    !scatterwalk_aligned(&walk->out, alignmask)) {		err = ablkcipher_next_slow(req, walk, bsize, alignmask,					   &src, &dst);		goto set_phys_lowmem;	} 	walk->nbytes = n; 	return ablkcipher_next_fast(req, walk); set_phys_lowmem:	if (err >= 0) {		walk->src.page = virt_to_page(src);		walk->dst.page = virt_to_page(dst);		walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));		walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));	} 	return err;} static int ablkcipher_walk_first(struct ablkcipher_request *req,				 struct ablkcipher_walk *walk){	struct crypto_tfm *tfm = req->base.tfm;	unsigned int alignmask; 	alignmask = crypto_tfm_alg_alignmask(tfm);	if (WARN_ON_ONCE(in_irq()))		return -EDEADLK; 	walk->iv = req->info;	walk->nbytes = walk->total;	if (unlikely(!walk->total))		return 0; 	walk->iv_buffer = NULL;	if (unlikely(((unsigned long)walk->iv & alignmask))) {		int err = ablkcipher_copy_iv(walk, tfm, alignmask); 		if (err)			return err;	} 	scatterwalk_start(&walk->in, walk->in.sg);	scatterwalk_start(&walk->out, walk->out.sg); 	return ablkcipher_walk_next(req, walk);} int ablkcipher_walk_phys(struct ablkcipher_request *req,			 struct ablkcipher_walk *walk){	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);	return ablkcipher_walk_first(req, walk);}EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,			    unsigned int keylen){	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);	int ret;	u8 *buffer, *alignbuffer;	unsigned long absize; 	absize = keylen + alignmask;	buffer = kmalloc(absize, GFP_ATOMIC);	if (!buffer)		return -ENOMEM; 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);	memcpy(alignbuffer, key, keylen);	ret = cipher->setkey(tfm, alignbuffer, keylen);	memset(alignbuffer, 0, keylen);	kfree(buffer);	return ret;} static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,		  unsigned int keylen){	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); 	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {		crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);		return -EINVAL;	} 	if ((unsigned long)key & alignmask)		return setkey_unaligned(tfm, key, keylen); 	return cipher->setkey(tfm, key, keylen);} static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,					      u32 mask){	return alg->cra_ctxsize;} static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,				      u32 mask){	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; 	if (alg->ivsize > PAGE_SIZE / 8)		return -EINVAL; 	crt->setkey = setkey;	crt->encrypt = alg->encrypt;	crt->decrypt = alg->decrypt;	crt->base = __crypto_ablkcipher_cast(tfm);	crt->ivsize = alg->ivsize; 	return 0;} #ifdef CONFIG_NETstatic int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_blkcipher rblkcipher; 	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",		sizeof(rblkcipher.geniv)); 	rblkcipher.blocksize = alg->cra_blocksize;	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; 	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,		    sizeof(struct crypto_report_blkcipher), &rblkcipher))		goto nla_put_failure;	return 0; nla_put_failure:	return -EMSGSIZE;}#elsestatic int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg){	return -ENOSYS;}#endif static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)	__maybe_unused;static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg){	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; 	seq_printf(m, "type         : ablkcipher\n");	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?					     "yes" : "no");	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<default>");} const struct crypto_type crypto_ablkcipher_type = {	.ctxsize = crypto_ablkcipher_ctxsize,	.init = crypto_init_ablkcipher_ops,#ifdef CONFIG_PROC_FS	.show = crypto_ablkcipher_show,#endif	.report = crypto_ablkcipher_report,};EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,				      u32 mask){	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; 	if (alg->ivsize > PAGE_SIZE / 8)		return -EINVAL; 	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?		      alg->setkey : setkey;	crt->encrypt = alg->encrypt;	crt->decrypt = alg->decrypt;	crt->base = __crypto_ablkcipher_cast(tfm);	crt->ivsize = alg->ivsize; 	return 0;} #ifdef CONFIG_NETstatic int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_blkcipher rblkcipher; 	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",		sizeof(rblkcipher.geniv)); 	rblkcipher.blocksize = alg->cra_blocksize;	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; 	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,		    sizeof(struct crypto_report_blkcipher), &rblkcipher))		goto nla_put_failure;	return 0; nla_put_failure:	return -EMSGSIZE;}#elsestatic int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg){	return -ENOSYS;}#endif static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)	__maybe_unused;static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg){	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; 	seq_printf(m, "type         : givcipher\n");	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?					     "yes" : "no");	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<built-in>");} const struct crypto_type crypto_givcipher_type = {	.ctxsize = crypto_ablkcipher_ctxsize,	.init = crypto_init_givcipher_ops,#ifdef CONFIG_PROC_FS	.show = crypto_givcipher_show,#endif	.report = crypto_givcipher_report,};EXPORT_SYMBOL_GPL(crypto_givcipher_type);