mirror of
https://github.com/adulau/aha.git
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crypto: xcbc - Switch to shash
This patch converts the xcbc algorithm to the new shash type. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
8bd1209cff
commit
3106caab61
1 changed files with 79 additions and 140 deletions
219
crypto/xcbc.c
219
crypto/xcbc.c
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@ -19,15 +19,9 @@
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* Kazunori Miyazawa <miyazawa@linux-ipv6.org>
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*/
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#include <crypto/scatterwalk.h>
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#include <linux/crypto.h>
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#include <crypto/internal/hash.h>
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#include <linux/err.h>
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#include <linux/hardirq.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/scatterlist.h>
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static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
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0x02020202, 0x02020202, 0x02020202, 0x02020202,
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@ -66,10 +60,10 @@ static void xor_128(u8 *a, const u8 *b, unsigned int bs)
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((u32 *)a)[3] ^= ((u32 *)b)[3];
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}
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static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent,
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static int _crypto_xcbc_digest_setkey(struct crypto_shash *parent,
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struct crypto_xcbc_ctx *ctx)
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{
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int bs = crypto_hash_blocksize(parent);
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int bs = crypto_shash_blocksize(parent);
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int err = 0;
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u8 key1[bs];
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@ -81,10 +75,10 @@ static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent,
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return crypto_cipher_setkey(ctx->child, key1, bs);
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}
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static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
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static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
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const u8 *inkey, unsigned int keylen)
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{
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
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struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
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if (keylen != crypto_cipher_blocksize(ctx->child))
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return -EINVAL;
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@ -96,10 +90,10 @@ static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
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return _crypto_xcbc_digest_setkey(parent, ctx);
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}
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static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
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static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
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{
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(pdesc->tfm);
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int bs = crypto_hash_blocksize(pdesc->tfm);
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struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(pdesc->tfm);
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int bs = crypto_shash_blocksize(pdesc->tfm);
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ctx->len = 0;
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memset(ctx->odds, 0, bs);
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@ -108,102 +102,55 @@ static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
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return 0;
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}
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static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
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struct scatterlist *sg,
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unsigned int nbytes)
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static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
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unsigned int len)
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{
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struct crypto_hash *parent = pdesc->tfm;
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
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struct crypto_shash *parent = pdesc->tfm;
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struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
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struct crypto_cipher *tfm = ctx->child;
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int bs = crypto_hash_blocksize(parent);
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int bs = crypto_shash_blocksize(parent);
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for (;;) {
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struct page *pg = sg_page(sg);
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unsigned int offset = sg->offset;
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unsigned int slen = sg->length;
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/* checking the data can fill the block */
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if ((ctx->len + len) <= bs) {
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memcpy(ctx->odds + ctx->len, p, len);
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ctx->len += len;
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return 0;
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}
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if (unlikely(slen > nbytes))
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slen = nbytes;
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/* filling odds with new data and encrypting it */
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memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
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len -= bs - ctx->len;
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p += bs - ctx->len;
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nbytes -= slen;
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ctx->xor(ctx->prev, ctx->odds, bs);
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crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
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while (slen > 0) {
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unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
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char *p = crypto_kmap(pg, 0) + offset;
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/* clearing the length */
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ctx->len = 0;
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/* checking the data can fill the block */
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if ((ctx->len + len) <= bs) {
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memcpy(ctx->odds + ctx->len, p, len);
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ctx->len += len;
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slen -= len;
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/* encrypting the rest of data */
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while (len > bs) {
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ctx->xor(ctx->prev, p, bs);
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crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
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p += bs;
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len -= bs;
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}
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/* checking the rest of the page */
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if (len + offset >= PAGE_SIZE) {
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offset = 0;
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pg++;
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} else
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offset += len;
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crypto_kunmap(p, 0);
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crypto_yield(pdesc->flags);
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continue;
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}
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/* filling odds with new data and encrypting it */
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memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
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len -= bs - ctx->len;
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p += bs - ctx->len;
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ctx->xor(ctx->prev, ctx->odds, bs);
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crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
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/* clearing the length */
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ctx->len = 0;
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/* encrypting the rest of data */
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while (len > bs) {
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ctx->xor(ctx->prev, p, bs);
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crypto_cipher_encrypt_one(tfm, ctx->prev,
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ctx->prev);
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p += bs;
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len -= bs;
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}
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/* keeping the surplus of blocksize */
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if (len) {
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memcpy(ctx->odds, p, len);
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ctx->len = len;
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}
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crypto_kunmap(p, 0);
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crypto_yield(pdesc->flags);
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slen -= min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
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offset = 0;
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pg++;
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}
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if (!nbytes)
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break;
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sg = scatterwalk_sg_next(sg);
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/* keeping the surplus of blocksize */
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if (len) {
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memcpy(ctx->odds, p, len);
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ctx->len = len;
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}
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return 0;
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}
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static int crypto_xcbc_digest_update(struct hash_desc *pdesc,
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struct scatterlist *sg,
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unsigned int nbytes)
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static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
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{
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if (WARN_ON_ONCE(in_irq()))
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return -EDEADLK;
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return crypto_xcbc_digest_update2(pdesc, sg, nbytes);
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}
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static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
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{
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struct crypto_hash *parent = pdesc->tfm;
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
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struct crypto_shash *parent = pdesc->tfm;
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struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
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struct crypto_cipher *tfm = ctx->child;
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int bs = crypto_hash_blocksize(parent);
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int bs = crypto_shash_blocksize(parent);
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int err = 0;
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if (ctx->len == bs) {
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@ -248,24 +195,13 @@ static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
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return 0;
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}
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static int crypto_xcbc_digest(struct hash_desc *pdesc,
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struct scatterlist *sg, unsigned int nbytes, u8 *out)
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{
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if (WARN_ON_ONCE(in_irq()))
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return -EDEADLK;
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crypto_xcbc_digest_init(pdesc);
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crypto_xcbc_digest_update2(pdesc, sg, nbytes);
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return crypto_xcbc_digest_final(pdesc, out);
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}
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static int xcbc_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_cipher *cipher;
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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_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm));
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int bs = crypto_hash_blocksize(__crypto_hash_cast(tfm));
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struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
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int bs = crypto_tfm_alg_blocksize(tfm);
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cipher = crypto_spawn_cipher(spawn);
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if (IS_ERR(cipher))
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@ -289,70 +225,73 @@ static int xcbc_init_tfm(struct crypto_tfm *tfm)
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static void xcbc_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm));
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struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(ctx->child);
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}
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static struct crypto_instance *xcbc_alloc(struct rtattr **tb)
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static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct crypto_instance *inst;
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struct shash_instance *inst;
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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_HASH);
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
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if (err)
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return ERR_PTR(err);
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return err;
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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 (IS_ERR(alg))
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return ERR_CAST(alg);
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return PTR_ERR(alg);
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switch(alg->cra_blocksize) {
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case 16:
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break;
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default:
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inst = ERR_PTR(-EINVAL);
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goto out_put_alg;
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}
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inst = crypto_alloc_instance("xcbc", alg);
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inst = shash_alloc_instance("xcbc", 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_HASH;
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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_hash_type;
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err = crypto_init_spawn(shash_instance_ctx(inst), alg,
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shash_crypto_instance(inst),
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CRYPTO_ALG_TYPE_MASK);
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if (err)
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goto out_free_inst;
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inst->alg.cra_hash.digestsize = alg->cra_blocksize;
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inst->alg.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
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ALIGN(inst->alg.cra_blocksize * 3, sizeof(void *));
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inst->alg.cra_init = xcbc_init_tfm;
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inst->alg.cra_exit = xcbc_exit_tfm;
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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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inst->alg.cra_hash.init = crypto_xcbc_digest_init;
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inst->alg.cra_hash.update = crypto_xcbc_digest_update;
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inst->alg.cra_hash.final = crypto_xcbc_digest_final;
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inst->alg.cra_hash.digest = crypto_xcbc_digest;
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inst->alg.cra_hash.setkey = crypto_xcbc_digest_setkey;
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inst->alg.digestsize = alg->cra_blocksize;
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
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ALIGN(alg->cra_blocksize * 3,
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sizeof(void *));
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inst->alg.base.cra_init = xcbc_init_tfm;
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inst->alg.base.cra_exit = xcbc_exit_tfm;
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inst->alg.init = crypto_xcbc_digest_init;
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inst->alg.update = crypto_xcbc_digest_update;
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inst->alg.final = crypto_xcbc_digest_final;
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inst->alg.setkey = crypto_xcbc_digest_setkey;
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err = shash_register_instance(tmpl, inst);
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if (err) {
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out_free_inst:
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shash_free_instance(shash_crypto_instance(inst));
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}
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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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static void xcbc_free(struct crypto_instance *inst)
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{
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crypto_drop_spawn(crypto_instance_ctx(inst));
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kfree(inst);
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return err;
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}
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static struct crypto_template crypto_xcbc_tmpl = {
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.name = "xcbc",
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.alloc = xcbc_alloc,
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.free = xcbc_free,
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.create = xcbc_create,
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.free = shash_free_instance,
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.module = THIS_MODULE,
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};
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