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crypto: cbc - Convert to skcipher
This patch converts cbc over to the skcipher interface. It also rearranges the code to allow it to be reused by drivers. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
da40e7a4ba
commit
79c65d179a
240
crypto/cbc.c
240
crypto/cbc.c
@ -10,42 +10,39 @@
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/skcipher.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/log2.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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struct crypto_cbc_ctx {
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struct crypto_cipher *child;
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};
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static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
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static int crypto_cbc_setkey(struct crypto_skcipher *parent, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(parent);
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struct crypto_cipher *child = ctx->child;
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int err;
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crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
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crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_cipher_setkey(child, key, keylen);
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crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
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crypto_skcipher_set_flags(parent, crypto_cipher_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 crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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static inline int crypto_cbc_encrypt_segment(
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struct skcipher_walk *walk, struct crypto_skcipher *tfm,
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void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_encrypt;
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int bsize = crypto_cipher_blocksize(tfm);
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unsigned int bsize = crypto_skcipher_blocksize(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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@ -53,7 +50,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
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do {
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crypto_xor(iv, src, bsize);
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fn(crypto_cipher_tfm(tfm), dst, iv);
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fn(tfm, iv, dst);
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memcpy(iv, dst, bsize);
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src += bsize;
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@ -63,20 +60,18 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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static inline int crypto_cbc_encrypt_inplace(
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struct skcipher_walk *walk, struct crypto_skcipher *tfm,
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void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_encrypt;
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int bsize = crypto_cipher_blocksize(tfm);
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unsigned int bsize = crypto_skcipher_blocksize(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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u8 *iv = walk->iv;
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do {
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crypto_xor(src, iv, bsize);
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fn(crypto_cipher_tfm(tfm), src, src);
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fn(tfm, src, src);
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iv = src;
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src += bsize;
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@ -87,44 +82,52 @@ static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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static inline int crypto_cbc_encrypt_walk(struct skcipher_request *req,
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void (*fn)(struct crypto_skcipher *,
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const u8 *, u8 *))
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{
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struct blkcipher_walk walk;
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struct crypto_blkcipher *tfm = desc->tfm;
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struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct skcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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while (walk.nbytes) {
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if (walk.src.virt.addr == walk.dst.virt.addr)
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nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child);
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err = crypto_cbc_encrypt_inplace(&walk, tfm, fn);
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else
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nbytes = crypto_cbc_encrypt_segment(desc, &walk, child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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err = crypto_cbc_encrypt_segment(&walk, tfm, fn);
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err = skcipher_walk_done(&walk, err);
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}
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return err;
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}
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static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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static inline void crypto_cbc_encrypt_one(struct crypto_skcipher *tfm,
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const u8 *src, u8 *dst)
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_decrypt;
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int bsize = crypto_cipher_blocksize(tfm);
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struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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crypto_cipher_encrypt_one(ctx->child, dst, src);
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}
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static int crypto_cbc_encrypt(struct skcipher_request *req)
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{
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return crypto_cbc_encrypt_walk(req, crypto_cbc_encrypt_one);
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}
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static inline int crypto_cbc_decrypt_segment(
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struct skcipher_walk *walk, struct crypto_skcipher *tfm,
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void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
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{
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unsigned int bsize = crypto_skcipher_blocksize(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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u8 *iv = walk->iv;
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do {
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fn(crypto_cipher_tfm(tfm), dst, src);
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fn(tfm, src, dst);
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crypto_xor(dst, iv, bsize);
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iv = src;
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@ -137,13 +140,11 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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static inline int crypto_cbc_decrypt_inplace(
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struct skcipher_walk *walk, struct crypto_skcipher *tfm,
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void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_decrypt;
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int bsize = crypto_cipher_blocksize(tfm);
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unsigned int bsize = crypto_skcipher_blocksize(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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u8 last_iv[bsize];
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@ -153,7 +154,7 @@ static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
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memcpy(last_iv, src, bsize);
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for (;;) {
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fn(crypto_cipher_tfm(tfm), src, src);
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fn(tfm, src, src);
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if ((nbytes -= bsize) < bsize)
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break;
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crypto_xor(src, src - bsize, bsize);
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@ -166,35 +167,46 @@ static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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static inline int crypto_cbc_decrypt_blocks(
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struct skcipher_walk *walk, struct crypto_skcipher *tfm,
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void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
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{
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struct blkcipher_walk walk;
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struct crypto_blkcipher *tfm = desc->tfm;
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struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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if (walk->src.virt.addr == walk->dst.virt.addr)
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return crypto_cbc_decrypt_inplace(walk, tfm, fn);
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else
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return crypto_cbc_decrypt_segment(walk, tfm, fn);
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}
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static inline void crypto_cbc_decrypt_one(struct crypto_skcipher *tfm,
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const u8 *src, u8 *dst)
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{
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struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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crypto_cipher_decrypt_one(ctx->child, dst, src);
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}
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static int crypto_cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct skcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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if (walk.src.virt.addr == walk.dst.virt.addr)
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nbytes = crypto_cbc_decrypt_inplace(desc, &walk, child);
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else
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nbytes = crypto_cbc_decrypt_segment(desc, &walk, child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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while (walk.nbytes) {
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err = crypto_cbc_decrypt_blocks(&walk, tfm,
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crypto_cbc_decrypt_one);
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err = skcipher_walk_done(&walk, err);
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}
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return err;
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}
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static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
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static int crypto_cbc_init_tfm(struct crypto_skcipher *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
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struct skcipher_instance *inst = skcipher_alg_instance(tfm);
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struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
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struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_cipher *cipher;
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cipher = crypto_spawn_cipher(spawn);
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@ -205,72 +217,94 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
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return 0;
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}
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static void crypto_cbc_exit_tfm(struct crypto_tfm *tfm)
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static void crypto_cbc_exit_tfm(struct crypto_skcipher *tfm)
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{
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struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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crypto_free_cipher(ctx->child);
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}
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static struct crypto_instance *crypto_cbc_alloc(struct rtattr **tb)
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static void crypto_cbc_free(struct skcipher_instance *inst)
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{
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struct crypto_instance *inst;
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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 crypto_cbc_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_spawn *spawn;
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struct crypto_alg *alg;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER);
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if (err)
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return ERR_PTR(err);
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return err;
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inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
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if (!inst)
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return -ENOMEM;
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alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
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CRYPTO_ALG_TYPE_MASK);
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err = PTR_ERR(alg);
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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goto err_free_inst;
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inst = ERR_PTR(-EINVAL);
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spawn = skcipher_instance_ctx(inst);
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err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
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CRYPTO_ALG_TYPE_MASK);
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crypto_mod_put(alg);
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if (err)
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goto err_free_inst;
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err = crypto_inst_setname(skcipher_crypto_instance(inst), "cbc", alg);
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if (err)
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goto err_drop_spawn;
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err = -EINVAL;
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if (!is_power_of_2(alg->cra_blocksize))
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goto out_put_alg;
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goto err_drop_spawn;
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inst = crypto_alloc_instance("cbc", alg);
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if (IS_ERR(inst))
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goto out_put_alg;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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inst->alg.cra_type = &crypto_blkcipher_type;
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inst->alg.base.cra_priority = alg->cra_priority;
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inst->alg.base.cra_blocksize = alg->cra_blocksize;
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inst->alg.base.cra_alignmask = alg->cra_alignmask;
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/* We access the data as u32s when xoring. */
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inst->alg.cra_alignmask |= __alignof__(u32) - 1;
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inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;
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inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
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inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
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inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
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inst->alg.ivsize = alg->cra_blocksize;
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inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
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inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;
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inst->alg.cra_ctxsize = sizeof(struct crypto_cbc_ctx);
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_cbc_ctx);
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inst->alg.cra_init = crypto_cbc_init_tfm;
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inst->alg.cra_exit = crypto_cbc_exit_tfm;
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inst->alg.init = crypto_cbc_init_tfm;
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inst->alg.exit = crypto_cbc_exit_tfm;
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inst->alg.cra_blkcipher.setkey = crypto_cbc_setkey;
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inst->alg.cra_blkcipher.encrypt = crypto_cbc_encrypt;
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inst->alg.cra_blkcipher.decrypt = crypto_cbc_decrypt;
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inst->alg.setkey = crypto_cbc_setkey;
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inst->alg.encrypt = crypto_cbc_encrypt;
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inst->alg.decrypt = crypto_cbc_decrypt;
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out_put_alg:
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crypto_mod_put(alg);
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return inst;
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}
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inst->free = crypto_cbc_free;
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static void crypto_cbc_free(struct crypto_instance *inst)
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{
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crypto_drop_spawn(crypto_instance_ctx(inst));
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err = skcipher_register_instance(tmpl, inst);
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if (err)
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goto err_drop_spawn;
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out:
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return err;
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err_drop_spawn:
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crypto_drop_spawn(spawn);
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err_free_inst:
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kfree(inst);
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goto out;
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}
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static struct crypto_template crypto_cbc_tmpl = {
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.name = "cbc",
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.alloc = crypto_cbc_alloc,
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.free = crypto_cbc_free,
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.create = crypto_cbc_create,
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.module = THIS_MODULE,
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};
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