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[CRYPTO] cbc: Use crypto_xor
This patch replaces the custom xor in CBC with the generic crypto_xor. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
7613636def
commit
3c7f076da5
1 changed files with 16 additions and 77 deletions
93
crypto/cbc.c
93
crypto/cbc.c
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@ -20,7 +20,6 @@
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struct crypto_cbc_ctx {
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struct crypto_cipher *child;
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void (*xor)(u8 *dst, const u8 *src, unsigned int bs);
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};
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static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
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@ -41,9 +40,7 @@ static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
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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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void (*xor)(u8 *, const u8 *,
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unsigned int))
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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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@ -54,7 +51,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
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u8 *iv = walk->iv;
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do {
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xor(iv, src, bsize);
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crypto_xor(iv, src, bsize);
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fn(crypto_cipher_tfm(tfm), dst, iv);
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memcpy(iv, dst, bsize);
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@ -67,9 +64,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
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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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void (*xor)(u8 *, const u8 *,
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unsigned int))
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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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@ -79,7 +74,7 @@ static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
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u8 *iv = walk->iv;
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do {
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xor(src, iv, bsize);
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crypto_xor(src, iv, bsize);
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fn(crypto_cipher_tfm(tfm), src, src);
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iv = src;
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@ -99,7 +94,6 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
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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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void (*xor)(u8 *, const u8 *, unsigned int bs) = ctx->xor;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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@ -107,11 +101,9 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
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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_encrypt_inplace(desc, &walk, child,
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xor);
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nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child);
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else
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nbytes = crypto_cbc_encrypt_segment(desc, &walk, child,
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xor);
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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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}
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@ -120,9 +112,7 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
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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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void (*xor)(u8 *, const u8 *,
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unsigned int))
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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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@ -134,7 +124,7 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
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do {
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fn(crypto_cipher_tfm(tfm), dst, src);
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xor(dst, iv, bsize);
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crypto_xor(dst, iv, bsize);
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iv = src;
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src += bsize;
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@ -148,9 +138,7 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
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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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void (*xor)(u8 *, const u8 *,
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unsigned int))
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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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@ -171,11 +159,11 @@ static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
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fn(crypto_cipher_tfm(tfm), src, src);
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if ((nbytes -= bsize) < bsize)
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break;
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xor(src, src - bsize, bsize);
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crypto_xor(src, src - bsize, bsize);
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src -= bsize;
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}
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xor(src, first_iv, bsize);
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crypto_xor(src, first_iv, bsize);
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return nbytes;
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}
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@ -188,7 +176,6 @@ static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
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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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void (*xor)(u8 *, const u8 *, unsigned int bs) = ctx->xor;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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@ -196,48 +183,15 @@ static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
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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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xor);
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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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xor);
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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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}
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return err;
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}
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static void xor_byte(u8 *a, const u8 *b, unsigned int bs)
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{
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do {
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*a++ ^= *b++;
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} while (--bs);
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}
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static void xor_quad(u8 *dst, const u8 *src, unsigned int bs)
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{
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u32 *a = (u32 *)dst;
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u32 *b = (u32 *)src;
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do {
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*a++ ^= *b++;
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} while ((bs -= 4));
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}
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static void xor_64(u8 *a, const u8 *b, unsigned int bs)
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{
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((u32 *)a)[0] ^= ((u32 *)b)[0];
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((u32 *)a)[1] ^= ((u32 *)b)[1];
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}
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static void xor_128(u8 *a, const u8 *b, unsigned int bs)
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{
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((u32 *)a)[0] ^= ((u32 *)b)[0];
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((u32 *)a)[1] ^= ((u32 *)b)[1];
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((u32 *)a)[2] ^= ((u32 *)b)[2];
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((u32 *)a)[3] ^= ((u32 *)b)[3];
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}
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static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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@ -245,22 +199,6 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
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struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_cipher *cipher;
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switch (crypto_tfm_alg_blocksize(tfm)) {
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case 8:
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ctx->xor = xor_64;
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break;
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case 16:
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ctx->xor = xor_128;
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break;
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default:
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if (crypto_tfm_alg_blocksize(tfm) % 4)
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ctx->xor = xor_byte;
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else
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ctx->xor = xor_quad;
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}
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cipher = crypto_spawn_cipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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@ -300,8 +238,9 @@ static struct crypto_instance *crypto_cbc_alloc(struct rtattr **tb)
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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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if (!(alg->cra_blocksize % 4))
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inst->alg.cra_alignmask |= 3;
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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.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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