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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <crypto/internal/aead.h>#include <crypto/internal/cipher.h>#include <crypto/internal/skcipher.h>#include <crypto/scatterwalk.h>#include <linux/bug.h>#include <linux/cryptouser.h>#include <linux/err.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/seq_file.h>#include <linux/slab.h>#include <linux/string.h>#include <linux/string_choices.h>#include <net/netlink.h>#include "skcipher.h"
#define CRYPTO_ALG_TYPE_SKCIPHER_MASK 0x0000000e
enum { SKCIPHER_WALK_SLOW = 1 << 0, SKCIPHER_WALK_COPY = 1 << 1, SKCIPHER_WALK_DIFF = 1 << 2, SKCIPHER_WALK_SLEEP = 1 << 3,};
static const struct crypto_type crypto_skcipher_type;
static int skcipher_walk_next(struct skcipher_walk *walk);
static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk){ return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC;}
static inline struct skcipher_alg *__crypto_skcipher_alg( struct crypto_alg *alg){ return container_of(alg, struct skcipher_alg, base);}
/** * skcipher_walk_done() - finish one step of a skcipher_walk * @walk: the skcipher_walk * @res: number of bytes *not* processed (>= 0) from walk->nbytes, * or a -errno value to terminate the walk due to an error * * This function cleans up after one step of walking through the source and * destination scatterlists, and advances to the next step if applicable. * walk->nbytes is set to the number of bytes available in the next step, * walk->total is set to the new total number of bytes remaining, and * walk->{src,dst}.virt.addr is set to the next pair of data pointers. If there * is no more data, or if an error occurred (i.e. -errno return), then * walk->nbytes and walk->total are set to 0 and all resources owned by the * skcipher_walk are freed. * * Return: 0 or a -errno value. If @res was a -errno value then it will be * returned, but other errors may occur too. */int skcipher_walk_done(struct skcipher_walk *walk, int res){ unsigned int n = walk->nbytes; /* num bytes processed this step */ unsigned int total = 0; /* new total remaining */
if (!n) goto finish;
if (likely(res >= 0)) { n -= res; /* subtract num bytes *not* processed */ total = walk->total - n; }
if (likely(!(walk->flags & (SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | SKCIPHER_WALK_DIFF)))) { scatterwalk_advance(&walk->in, n); } else if (walk->flags & SKCIPHER_WALK_DIFF) { scatterwalk_done_src(&walk->in, n); } else if (walk->flags & SKCIPHER_WALK_COPY) { scatterwalk_advance(&walk->in, n); scatterwalk_map(&walk->out); memcpy(walk->out.addr, walk->page, n); } else { /* SKCIPHER_WALK_SLOW */ if (res > 0) { /* * Didn't process all bytes. Either the algorithm is * broken, or this was the last step and it turned out * the message wasn't evenly divisible into blocks but * the algorithm requires it. */ res = -EINVAL; total = 0; } else memcpy_to_scatterwalk(&walk->out, walk->out.addr, n); goto dst_done; }
scatterwalk_done_dst(&walk->out, n);dst_done:
if (res > 0) res = 0;
walk->total = total; walk->nbytes = 0;
if (total) { if (walk->flags & SKCIPHER_WALK_SLEEP) cond_resched(); walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | SKCIPHER_WALK_DIFF); return skcipher_walk_next(walk); }
finish: /* Short-circuit for the common/fast path. */ if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) goto out;
if (walk->iv != walk->oiv) memcpy(walk->oiv, walk->iv, walk->ivsize); if (walk->buffer != walk->page) kfree(walk->buffer); if (walk->page) free_page((unsigned long)walk->page);
out: return res;}EXPORT_SYMBOL_GPL(skcipher_walk_done);
static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize){ unsigned alignmask = walk->alignmask; unsigned n; void *buffer;
if (!walk->buffer) walk->buffer = walk->page; buffer = walk->buffer; if (!buffer) { /* Min size for a buffer of bsize bytes aligned to alignmask */ n = bsize + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
buffer = kzalloc(n, skcipher_walk_gfp(walk)); if (!buffer) return skcipher_walk_done(walk, -ENOMEM); walk->buffer = buffer; }
buffer = PTR_ALIGN(buffer, alignmask + 1); memcpy_from_scatterwalk(buffer, &walk->in, bsize); walk->out.__addr = buffer; walk->in.__addr = walk->out.addr;
walk->nbytes = bsize; walk->flags |= SKCIPHER_WALK_SLOW;
return 0;}
static int skcipher_next_copy(struct skcipher_walk *walk){ void *tmp = walk->page;
scatterwalk_map(&walk->in); memcpy(tmp, walk->in.addr, walk->nbytes); scatterwalk_unmap(&walk->in); /* * walk->in is advanced later when the number of bytes actually * processed (which might be less than walk->nbytes) is known. */
walk->in.__addr = tmp; walk->out.__addr = tmp; return 0;}
static int skcipher_next_fast(struct skcipher_walk *walk){ unsigned long diff;
diff = offset_in_page(walk->in.offset) - offset_in_page(walk->out.offset); diff |= (u8 *)(sg_page(walk->in.sg) + (walk->in.offset >> PAGE_SHIFT)) - (u8 *)(sg_page(walk->out.sg) + (walk->out.offset >> PAGE_SHIFT));
scatterwalk_map(&walk->out); walk->in.__addr = walk->out.__addr;
if (diff) { walk->flags |= SKCIPHER_WALK_DIFF; scatterwalk_map(&walk->in); }
return 0;}
static int skcipher_walk_next(struct skcipher_walk *walk){ unsigned int bsize; unsigned int n;
n = walk->total; bsize = min(walk->stride, max(n, walk->blocksize)); n = scatterwalk_clamp(&walk->in, n); n = scatterwalk_clamp(&walk->out, n);
if (unlikely(n < bsize)) { if (unlikely(walk->total < walk->blocksize)) return skcipher_walk_done(walk, -EINVAL);
slow_path: return skcipher_next_slow(walk, bsize); } walk->nbytes = n;
if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { if (!walk->page) { gfp_t gfp = skcipher_walk_gfp(walk);
walk->page = (void *)__get_free_page(gfp); if (!walk->page) goto slow_path; } walk->flags |= SKCIPHER_WALK_COPY; return skcipher_next_copy(walk); }
return skcipher_next_fast(walk);}
static int skcipher_copy_iv(struct skcipher_walk *walk){ unsigned alignmask = walk->alignmask; unsigned ivsize = walk->ivsize; unsigned aligned_stride = ALIGN(walk->stride, alignmask + 1); unsigned size; u8 *iv;
/* Min size for a buffer of stride + ivsize, aligned to alignmask */ size = aligned_stride + ivsize + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); if (!walk->buffer) return -ENOMEM;
iv = PTR_ALIGN(walk->buffer, alignmask + 1) + aligned_stride;
walk->iv = memcpy(iv, walk->iv, walk->ivsize); return 0;}
static int skcipher_walk_first(struct skcipher_walk *walk){ if (WARN_ON_ONCE(in_hardirq())) return -EDEADLK;
walk->buffer = NULL; if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { int err = skcipher_copy_iv(walk); if (err) return err; }
walk->page = NULL;
return skcipher_walk_next(walk);}
int skcipher_walk_virt(struct skcipher_walk *__restrict walk, struct skcipher_request *__restrict req, bool atomic){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct skcipher_alg *alg;
might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
alg = crypto_skcipher_alg(tfm);
walk->total = req->cryptlen; walk->nbytes = 0; walk->iv = req->iv; walk->oiv = req->iv; if ((req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) && !atomic) walk->flags = SKCIPHER_WALK_SLEEP; else walk->flags = 0;
if (unlikely(!walk->total)) return 0;
scatterwalk_start(&walk->in, req->src); scatterwalk_start(&walk->out, req->dst);
walk->blocksize = crypto_skcipher_blocksize(tfm); walk->ivsize = crypto_skcipher_ivsize(tfm); walk->alignmask = crypto_skcipher_alignmask(tfm);
if (alg->co.base.cra_type != &crypto_skcipher_type) walk->stride = alg->co.chunksize; else walk->stride = alg->walksize;
return skcipher_walk_first(walk);}EXPORT_SYMBOL_GPL(skcipher_walk_virt);
static int skcipher_walk_aead_common(struct skcipher_walk *__restrict walk, struct aead_request *__restrict req, bool atomic){ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
walk->nbytes = 0; walk->iv = req->iv; walk->oiv = req->iv; if ((req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) && !atomic) walk->flags = SKCIPHER_WALK_SLEEP; else walk->flags = 0;
if (unlikely(!walk->total)) return 0;
scatterwalk_start_at_pos(&walk->in, req->src, req->assoclen); scatterwalk_start_at_pos(&walk->out, req->dst, req->assoclen);
walk->blocksize = crypto_aead_blocksize(tfm); walk->stride = crypto_aead_chunksize(tfm); walk->ivsize = crypto_aead_ivsize(tfm); walk->alignmask = crypto_aead_alignmask(tfm);
return skcipher_walk_first(walk);}
int skcipher_walk_aead_encrypt(struct skcipher_walk *__restrict walk, struct aead_request *__restrict req, bool atomic){ walk->total = req->cryptlen;
return skcipher_walk_aead_common(walk, req, atomic);}EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt);
int skcipher_walk_aead_decrypt(struct skcipher_walk *__restrict walk, struct aead_request *__restrict req, bool atomic){ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
walk->total = req->cryptlen - crypto_aead_authsize(tfm);
return skcipher_walk_aead_common(walk, req, atomic);}EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt);
static void skcipher_set_needkey(struct crypto_skcipher *tfm){ if (crypto_skcipher_max_keysize(tfm) != 0) crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY);}
static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen){ unsigned long alignmask = crypto_skcipher_alignmask(tfm); struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); u8 *buffer, *alignbuffer; unsigned long absize; int ret;
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); kfree_sensitive(buffer); return ret;}
int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen){ struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); unsigned long alignmask = crypto_skcipher_alignmask(tfm); int err;
if (cipher->co.base.cra_type != &crypto_skcipher_type) { struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm);
crypto_lskcipher_clear_flags(*ctx, CRYPTO_TFM_REQ_MASK); crypto_lskcipher_set_flags(*ctx, crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_MASK); err = crypto_lskcipher_setkey(*ctx, key, keylen); goto out; }
if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) return -EINVAL;
if ((unsigned long)key & alignmask) err = skcipher_setkey_unaligned(tfm, key, keylen); else err = cipher->setkey(tfm, key, keylen);
out: if (unlikely(err)) { skcipher_set_needkey(tfm); return err; }
crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); return 0;}EXPORT_SYMBOL_GPL(crypto_skcipher_setkey);
int crypto_skcipher_encrypt(struct skcipher_request *req){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; if (alg->co.base.cra_type != &crypto_skcipher_type) return crypto_lskcipher_encrypt_sg(req); return alg->encrypt(req);}EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt);
int crypto_skcipher_decrypt(struct skcipher_request *req){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; if (alg->co.base.cra_type != &crypto_skcipher_type) return crypto_lskcipher_decrypt_sg(req); return alg->decrypt(req);}EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt);
static int crypto_lskcipher_export(struct skcipher_request *req, void *out){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); u8 *ivs = skcipher_request_ctx(req);
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
memcpy(out, ivs + crypto_skcipher_ivsize(tfm), crypto_skcipher_statesize(tfm));
return 0;}
static int crypto_lskcipher_import(struct skcipher_request *req, const void *in){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); u8 *ivs = skcipher_request_ctx(req);
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
memcpy(ivs + crypto_skcipher_ivsize(tfm), in, crypto_skcipher_statesize(tfm));
return 0;}
static int skcipher_noexport(struct skcipher_request *req, void *out){ return 0;}
static int skcipher_noimport(struct skcipher_request *req, const void *in){ return 0;}
int crypto_skcipher_export(struct skcipher_request *req, void *out){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
if (alg->co.base.cra_type != &crypto_skcipher_type) return crypto_lskcipher_export(req, out); return alg->export(req, out);}EXPORT_SYMBOL_GPL(crypto_skcipher_export);
int crypto_skcipher_import(struct skcipher_request *req, const void *in){ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
if (alg->co.base.cra_type != &crypto_skcipher_type) return crypto_lskcipher_import(req, in); return alg->import(req, in);}EXPORT_SYMBOL_GPL(crypto_skcipher_import);
static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm){ struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
alg->exit(skcipher);}
static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm){ struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
skcipher_set_needkey(skcipher);
if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) { unsigned am = crypto_skcipher_alignmask(skcipher); unsigned reqsize;
reqsize = am & ~(crypto_tfm_ctx_alignment() - 1); reqsize += crypto_skcipher_ivsize(skcipher); reqsize += crypto_skcipher_statesize(skcipher); crypto_skcipher_set_reqsize(skcipher, reqsize);
return crypto_init_lskcipher_ops_sg(tfm); }
crypto_skcipher_set_reqsize(skcipher, crypto_tfm_alg_reqsize(tfm));
if (alg->exit) skcipher->base.exit = crypto_skcipher_exit_tfm;
if (alg->init) return alg->init(skcipher);
return 0;}
static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg){ if (alg->cra_type != &crypto_skcipher_type) return sizeof(struct crypto_lskcipher *);
return crypto_alg_extsize(alg);}
static void crypto_skcipher_free_instance(struct crypto_instance *inst){ struct skcipher_instance *skcipher = container_of(inst, struct skcipher_instance, s.base);
skcipher->free(skcipher);}
static void __maybe_unused crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg){ struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg);
seq_printf(m, "type : skcipher\n"); seq_printf(m, "async : %s\n", str_yes_no(alg->cra_flags & CRYPTO_ALG_ASYNC)); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); seq_printf(m, "ivsize : %u\n", skcipher->ivsize); seq_printf(m, "chunksize : %u\n", skcipher->chunksize); seq_printf(m, "walksize : %u\n", skcipher->walksize); seq_printf(m, "statesize : %u\n", skcipher->statesize);}
static int __maybe_unused crypto_skcipher_report( struct sk_buff *skb, struct crypto_alg *alg){ struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); struct crypto_report_blkcipher rblkcipher = { .type = "skcipher", .geniv = "<none>", };
rblkcipher.blocksize = alg->cra_blocksize; rblkcipher.min_keysize = skcipher->min_keysize; rblkcipher.max_keysize = skcipher->max_keysize; rblkcipher.ivsize = skcipher->ivsize;
return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, sizeof(rblkcipher), &rblkcipher);}
static const struct crypto_type crypto_skcipher_type = { .extsize = crypto_skcipher_extsize, .init_tfm = crypto_skcipher_init_tfm, .free = crypto_skcipher_free_instance,#ifdef CONFIG_PROC_FS .show = crypto_skcipher_show,#endif#if IS_ENABLED(CONFIG_CRYPTO_USER) .report = crypto_skcipher_report,#endif .maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK, .type = CRYPTO_ALG_TYPE_SKCIPHER, .tfmsize = offsetof(struct crypto_skcipher, base), .algsize = offsetof(struct skcipher_alg, base),};
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst, const char *name, u32 type, u32 mask){ spawn->base.frontend = &crypto_skcipher_type; return crypto_grab_spawn(&spawn->base, inst, name, type, mask);}EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, u32 type, u32 mask){ return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask);}EXPORT_SYMBOL_GPL(crypto_alloc_skcipher);
struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( const char *alg_name, u32 type, u32 mask){ struct crypto_skcipher *tfm;
/* Only sync algorithms allowed. */ mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE; type &= ~(CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE);
tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask);
/* * Make sure we do not allocate something that might get used with * an on-stack request: check the request size. */ if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > MAX_SYNC_SKCIPHER_REQSIZE)) { crypto_free_skcipher(tfm); return ERR_PTR(-EINVAL); }
return (struct crypto_sync_skcipher *)tfm;}EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher);
int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask){ return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask);}EXPORT_SYMBOL_GPL(crypto_has_skcipher);
int skcipher_prepare_alg_common(struct skcipher_alg_common *alg){ struct crypto_alg *base = &alg->base;
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || alg->statesize > PAGE_SIZE / 2 || (alg->ivsize + alg->statesize) > PAGE_SIZE / 2) return -EINVAL;
if (!alg->chunksize) alg->chunksize = base->cra_blocksize;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
return 0;}
static int skcipher_prepare_alg(struct skcipher_alg *alg){ struct crypto_alg *base = &alg->base; int err;
err = skcipher_prepare_alg_common(&alg->co); if (err) return err;
if (alg->walksize > PAGE_SIZE / 8) return -EINVAL;
if (!alg->walksize) alg->walksize = alg->chunksize;
if (!alg->statesize) { alg->import = skcipher_noimport; alg->export = skcipher_noexport; } else if (!(alg->import && alg->export)) return -EINVAL;
base->cra_type = &crypto_skcipher_type; base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
return 0;}
int crypto_register_skcipher(struct skcipher_alg *alg){ struct crypto_alg *base = &alg->base; int err;
err = skcipher_prepare_alg(alg); if (err) return err;
return crypto_register_alg(base);}EXPORT_SYMBOL_GPL(crypto_register_skcipher);
void crypto_unregister_skcipher(struct skcipher_alg *alg){ crypto_unregister_alg(&alg->base);}EXPORT_SYMBOL_GPL(crypto_unregister_skcipher);
int crypto_register_skciphers(struct skcipher_alg *algs, int count){ int i, ret;
for (i = 0; i < count; i++) { ret = crypto_register_skcipher(&algs[i]); if (ret) { crypto_unregister_skciphers(algs, i); return ret; } }
return 0;}EXPORT_SYMBOL_GPL(crypto_register_skciphers);
void crypto_unregister_skciphers(struct skcipher_alg *algs, int count){ int i;
for (i = count - 1; i >= 0; --i) crypto_unregister_skcipher(&algs[i]);}EXPORT_SYMBOL_GPL(crypto_unregister_skciphers);
int skcipher_register_instance(struct crypto_template *tmpl, struct skcipher_instance *inst){ int err;
if (WARN_ON(!inst->free)) return -EINVAL;
err = skcipher_prepare_alg(&inst->alg); if (err) return err;
return crypto_register_instance(tmpl, skcipher_crypto_instance(inst));}EXPORT_SYMBOL_GPL(skcipher_register_instance);
static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen){ struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_MASK); return crypto_cipher_setkey(cipher, key, keylen);}
static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm){ struct skcipher_instance *inst = skcipher_alg_instance(tfm); struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst); struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); struct crypto_cipher *cipher;
cipher = crypto_spawn_cipher(spawn); if (IS_ERR(cipher)) return PTR_ERR(cipher);
ctx->cipher = cipher; return 0;}
static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm){ struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
crypto_free_cipher(ctx->cipher);}
static void skcipher_free_instance_simple(struct skcipher_instance *inst){ crypto_drop_cipher(skcipher_instance_ctx(inst)); kfree(inst);}
/** * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode * * Allocate an skcipher_instance for a simple block cipher mode of operation, * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, * alignmask, and priority are set from the underlying cipher but can be * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and * default ->setkey(), ->init(), and ->exit() methods are installed. * * @tmpl: the template being instantiated * @tb: the template parameters * * Return: a pointer to the new instance, or an ERR_PTR(). The caller still * needs to register the instance. */struct skcipher_instance *skcipher_alloc_instance_simple( struct crypto_template *tmpl, struct rtattr **tb){ u32 mask; struct skcipher_instance *inst; struct crypto_cipher_spawn *spawn; struct crypto_alg *cipher_alg; int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); if (err) return ERR_PTR(err);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return ERR_PTR(-ENOMEM); spawn = skcipher_instance_ctx(inst);
err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst), crypto_attr_alg_name(tb[1]), 0, mask); if (err) goto err_free_inst; cipher_alg = crypto_spawn_cipher_alg(spawn);
err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, cipher_alg); if (err) goto err_free_inst;
inst->free = skcipher_free_instance_simple;
/* Default algorithm properties, can be overridden */ inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; inst->alg.base.cra_priority = cipher_alg->cra_priority; inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; inst->alg.ivsize = cipher_alg->cra_blocksize;
/* Use skcipher_ctx_simple by default, can be overridden */ inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); inst->alg.setkey = skcipher_setkey_simple; inst->alg.init = skcipher_init_tfm_simple; inst->alg.exit = skcipher_exit_tfm_simple;
return inst;
err_free_inst: skcipher_free_instance_simple(inst); return ERR_PTR(err);}EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Symmetric key cipher type");MODULE_IMPORT_NS("CRYPTO_INTERNAL");