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crypto: skcipher - Make use of internal state
This patch adds code to the skcipher/lskcipher API to make use of the internal state if present. In particular, the skcipher lskcipher wrapper will allocate a buffer for the IV/state and feed that to the underlying lskcipher algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
0ae4dcc1eb
commit
662ea18d08
3 changed files with 139 additions and 8 deletions
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@ -90,6 +90,7 @@ static int crypto_lskcipher_crypt_unaligned(
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u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src,
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u8 *dst, unsigned len, u8 *iv, u32 flags))
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{
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unsigned statesize = crypto_lskcipher_statesize(tfm);
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unsigned ivsize = crypto_lskcipher_ivsize(tfm);
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unsigned bs = crypto_lskcipher_blocksize(tfm);
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unsigned cs = crypto_lskcipher_chunksize(tfm);
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@ -104,7 +105,7 @@ static int crypto_lskcipher_crypt_unaligned(
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if (!tiv)
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return -ENOMEM;
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memcpy(tiv, iv, ivsize);
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memcpy(tiv, iv, ivsize + statesize);
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p = kmalloc(PAGE_SIZE, GFP_ATOMIC);
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err = -ENOMEM;
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@ -132,7 +133,7 @@ static int crypto_lskcipher_crypt_unaligned(
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err = len ? -EINVAL : 0;
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out:
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memcpy(iv, tiv, ivsize);
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memcpy(iv, tiv, ivsize + statesize);
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kfree_sensitive(p);
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kfree_sensitive(tiv);
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return err;
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@ -197,25 +198,45 @@ EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);
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static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
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int (*crypt)(struct crypto_lskcipher *tfm,
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const u8 *src, u8 *dst,
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unsigned len, u8 *iv,
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unsigned len, u8 *ivs,
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u32 flags))
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{
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struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
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struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
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u8 *ivs = skcipher_request_ctx(req);
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struct crypto_lskcipher *tfm = *ctx;
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struct skcipher_walk walk;
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unsigned ivsize;
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u32 flags;
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int err;
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ivsize = crypto_lskcipher_ivsize(tfm);
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ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1);
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flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT)
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flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
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else
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memcpy(ivs, req->iv, ivsize);
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if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
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flags |= CRYPTO_LSKCIPHER_FLAG_FINAL;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes) {
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err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
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walk.nbytes, walk.iv,
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walk.nbytes == walk.total ?
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CRYPTO_LSKCIPHER_FLAG_FINAL : 0);
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walk.nbytes, ivs,
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flags & ~(walk.nbytes == walk.total ?
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0 : CRYPTO_LSKCIPHER_FLAG_FINAL));
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err = skcipher_walk_done(&walk, err);
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flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
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}
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if (flags & CRYPTO_LSKCIPHER_FLAG_FINAL)
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memcpy(req->iv, ivs, ivsize);
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return err;
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}
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@ -278,6 +299,7 @@ static void __maybe_unused crypto_lskcipher_show(
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seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize);
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seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize);
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seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize);
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seq_printf(m, "statesize : %u\n", skcipher->co.statesize);
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}
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static int __maybe_unused crypto_lskcipher_report(
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@ -698,6 +698,64 @@ int crypto_skcipher_decrypt(struct skcipher_request *req)
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}
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EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt);
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static int crypto_lskcipher_export(struct skcipher_request *req, void *out)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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u8 *ivs = skcipher_request_ctx(req);
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ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
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memcpy(out, ivs + crypto_skcipher_ivsize(tfm),
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crypto_skcipher_statesize(tfm));
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return 0;
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}
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static int crypto_lskcipher_import(struct skcipher_request *req, const void *in)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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u8 *ivs = skcipher_request_ctx(req);
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ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
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memcpy(ivs + crypto_skcipher_ivsize(tfm), in,
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crypto_skcipher_statesize(tfm));
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return 0;
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}
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static int skcipher_noexport(struct skcipher_request *req, void *out)
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{
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return 0;
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}
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static int skcipher_noimport(struct skcipher_request *req, const void *in)
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{
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return 0;
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}
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int crypto_skcipher_export(struct skcipher_request *req, void *out)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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if (alg->co.base.cra_type != &crypto_skcipher_type)
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return crypto_lskcipher_export(req, out);
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return alg->export(req, out);
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}
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EXPORT_SYMBOL_GPL(crypto_skcipher_export);
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int crypto_skcipher_import(struct skcipher_request *req, const void *in)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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if (alg->co.base.cra_type != &crypto_skcipher_type)
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return crypto_lskcipher_import(req, in);
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return alg->import(req, in);
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}
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EXPORT_SYMBOL_GPL(crypto_skcipher_import);
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static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
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@ -713,8 +771,17 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
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skcipher_set_needkey(skcipher);
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if (tfm->__crt_alg->cra_type != &crypto_skcipher_type)
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if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) {
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unsigned am = crypto_skcipher_alignmask(skcipher);
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unsigned reqsize;
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reqsize = am & ~(crypto_tfm_ctx_alignment() - 1);
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reqsize += crypto_skcipher_ivsize(skcipher);
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reqsize += crypto_skcipher_statesize(skcipher);
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crypto_skcipher_set_reqsize(skcipher, reqsize);
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return crypto_init_lskcipher_ops_sg(tfm);
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}
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if (alg->exit)
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skcipher->base.exit = crypto_skcipher_exit_tfm;
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@ -756,6 +823,7 @@ static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
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seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
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seq_printf(m, "chunksize : %u\n", skcipher->chunksize);
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seq_printf(m, "walksize : %u\n", skcipher->walksize);
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seq_printf(m, "statesize : %u\n", skcipher->statesize);
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}
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static int __maybe_unused crypto_skcipher_report(
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@ -870,7 +938,9 @@ int skcipher_prepare_alg_common(struct skcipher_alg_common *alg)
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struct crypto_istat_cipher *istat = skcipher_get_stat_common(alg);
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struct crypto_alg *base = &alg->base;
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if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8)
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if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
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alg->statesize > PAGE_SIZE / 2 ||
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(alg->ivsize + alg->statesize) > PAGE_SIZE / 2)
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return -EINVAL;
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if (!alg->chunksize)
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@ -899,6 +969,12 @@ static int skcipher_prepare_alg(struct skcipher_alg *alg)
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if (!alg->walksize)
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alg->walksize = alg->chunksize;
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if (!alg->statesize) {
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alg->import = skcipher_noimport;
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alg->export = skcipher_noexport;
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} else if (!(alg->import && alg->export))
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return -EINVAL;
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base->cra_type = &crypto_skcipher_type;
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base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
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@ -746,6 +746,39 @@ int crypto_skcipher_encrypt(struct skcipher_request *req);
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*/
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int crypto_skcipher_decrypt(struct skcipher_request *req);
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/**
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* crypto_skcipher_export() - export partial state
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* @req: reference to the skcipher_request handle that holds all information
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* needed to perform the operation
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* @out: output buffer of sufficient size that can hold the state
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*
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* Export partial state of the transformation. This function dumps the
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* entire state of the ongoing transformation into a provided block of
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* data so it can be @import 'ed back later on. This is useful in case
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* you want to save partial result of the transformation after
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* processing certain amount of data and reload this partial result
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* multiple times later on for multiple re-use. No data processing
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* happens at this point.
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*
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* Return: 0 if the cipher operation was successful; < 0 if an error occurred
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*/
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int crypto_skcipher_export(struct skcipher_request *req, void *out);
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/**
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* crypto_skcipher_import() - import partial state
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* @req: reference to the skcipher_request handle that holds all information
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* needed to perform the operation
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* @in: buffer holding the state
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*
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* Import partial state of the transformation. This function loads the
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* entire state of the ongoing transformation from a provided block of
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* data so the transformation can continue from this point onward. No
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* data processing happens at this point.
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*
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* Return: 0 if the cipher operation was successful; < 0 if an error occurred
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*/
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int crypto_skcipher_import(struct skcipher_request *req, const void *in);
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/**
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* crypto_lskcipher_encrypt() - encrypt plaintext
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* @tfm: lskcipher handle
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