crypto: pcbc - Convert to skcipher
This patch converts lrw over to the skcipher interface. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
266d051601
commit
043a44001b
201
crypto/pcbc.c
201
crypto/pcbc.c
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@ -14,40 +14,37 @@
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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/module.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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struct crypto_pcbc_ctx {
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struct crypto_cipher *child;
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};
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static int crypto_pcbc_setkey(struct crypto_tfm *parent, const u8 *key,
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static int crypto_pcbc_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_pcbc_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_pcbc_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_TFM_REQ_MASK);
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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_TFM_RES_MASK);
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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_pcbc_encrypt_segment(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
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struct skcipher_walk *walk,
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struct crypto_cipher *tfm)
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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 nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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@ -56,7 +53,7 @@ static int crypto_pcbc_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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crypto_cipher_encrypt_one(tfm, dst, iv);
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memcpy(iv, dst, bsize);
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crypto_xor(iv, src, bsize);
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@ -67,12 +64,10 @@ static int crypto_pcbc_encrypt_segment(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_pcbc_encrypt_inplace(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
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struct skcipher_walk *walk,
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struct crypto_cipher *tfm)
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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 nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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@ -82,7 +77,7 @@ static int crypto_pcbc_encrypt_inplace(struct blkcipher_desc *desc,
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do {
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memcpy(tmpbuf, src, bsize);
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crypto_xor(iv, src, bsize);
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fn(crypto_cipher_tfm(tfm), src, iv);
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crypto_cipher_encrypt_one(tfm, src, iv);
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memcpy(iv, tmpbuf, bsize);
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crypto_xor(iv, src, bsize);
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@ -94,38 +89,34 @@ static int crypto_pcbc_encrypt_inplace(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_pcbc_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 int crypto_pcbc_encrypt(struct skcipher_request *req)
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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_pcbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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struct skcipher_walk walk;
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unsigned int nbytes;
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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_pcbc_encrypt_inplace(desc, &walk,
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nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
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child);
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else
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nbytes = crypto_pcbc_encrypt_segment(desc, &walk,
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nbytes = crypto_pcbc_encrypt_segment(req, &walk,
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child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static int crypto_pcbc_decrypt_segment(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
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struct skcipher_walk *walk,
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struct crypto_cipher *tfm)
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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 nbytes = walk->nbytes;
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u8 *src = walk->src.virt.addr;
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@ -133,7 +124,7 @@ static int crypto_pcbc_decrypt_segment(struct blkcipher_desc *desc,
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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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crypto_cipher_decrypt_one(tfm, dst, src);
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crypto_xor(dst, iv, bsize);
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memcpy(iv, src, bsize);
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crypto_xor(iv, dst, bsize);
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@ -147,21 +138,19 @@ static int crypto_pcbc_decrypt_segment(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_pcbc_decrypt_inplace(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
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struct skcipher_walk *walk,
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struct crypto_cipher *tfm)
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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 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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u8 tmpbuf[bsize];
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u8 tmpbuf[bsize] __attribute__ ((aligned(__alignof__(u32))));
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do {
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memcpy(tmpbuf, src, bsize);
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fn(crypto_cipher_tfm(tfm), src, src);
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crypto_cipher_decrypt_one(tfm, src, src);
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crypto_xor(src, iv, bsize);
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memcpy(iv, tmpbuf, bsize);
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crypto_xor(iv, src, bsize);
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@ -174,37 +163,35 @@ static int crypto_pcbc_decrypt_inplace(struct blkcipher_desc *desc,
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return nbytes;
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}
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static int crypto_pcbc_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 int crypto_pcbc_decrypt(struct skcipher_request *req)
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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_pcbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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struct skcipher_walk walk;
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unsigned int nbytes;
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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_pcbc_decrypt_inplace(desc, &walk,
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nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
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child);
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else
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nbytes = crypto_pcbc_decrypt_segment(desc, &walk,
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nbytes = crypto_pcbc_decrypt_segment(req, &walk,
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child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static int crypto_pcbc_init_tfm(struct crypto_tfm *tfm)
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static int crypto_pcbc_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_pcbc_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_pcbc_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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@ -215,68 +202,98 @@ static int crypto_pcbc_init_tfm(struct crypto_tfm *tfm)
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return 0;
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}
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static void crypto_pcbc_exit_tfm(struct crypto_tfm *tfm)
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static void crypto_pcbc_exit_tfm(struct crypto_skcipher *tfm)
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{
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struct crypto_pcbc_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_pcbc_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_pcbc_alloc(struct rtattr **tb)
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static void crypto_pcbc_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_pcbc_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_attr_type *algt;
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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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if (err)
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return ERR_PTR(err);
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return PTR_ERR(algt);
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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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if (((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) &
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~CRYPTO_ALG_INTERNAL)
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return -EINVAL;
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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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(algt->type & CRYPTO_ALG_INTERNAL),
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CRYPTO_ALG_TYPE_MASK |
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(algt->mask & CRYPTO_ALG_INTERNAL));
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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 = crypto_alloc_instance("pcbc", alg);
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if (IS_ERR(inst))
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goto out_put_alg;
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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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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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err = crypto_inst_setname(skcipher_crypto_instance(inst), "pcbc", alg);
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if (err)
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goto err_drop_spawn;
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inst->alg.base.cra_flags = alg->cra_flags & CRYPTO_ALG_INTERNAL;
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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_pcbc_ctx);
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);
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inst->alg.cra_init = crypto_pcbc_init_tfm;
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inst->alg.cra_exit = crypto_pcbc_exit_tfm;
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inst->alg.init = crypto_pcbc_init_tfm;
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inst->alg.exit = crypto_pcbc_exit_tfm;
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inst->alg.cra_blkcipher.setkey = crypto_pcbc_setkey;
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inst->alg.cra_blkcipher.encrypt = crypto_pcbc_encrypt;
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inst->alg.cra_blkcipher.decrypt = crypto_pcbc_decrypt;
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inst->alg.setkey = crypto_pcbc_setkey;
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inst->alg.encrypt = crypto_pcbc_encrypt;
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inst->alg.decrypt = crypto_pcbc_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_pcbc_free;
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static void crypto_pcbc_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_pcbc_tmpl = {
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.name = "pcbc",
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.alloc = crypto_pcbc_alloc,
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.free = crypto_pcbc_free,
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.create = crypto_pcbc_create,
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.module = THIS_MODULE,
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};
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