[CRYPTO] ctr: Refactor into ctr and rfc3686
As discussed previously, this patch moves the basic CTR functionality into a chainable algorithm called ctr. The IPsec-specific variant of it is now placed on top with the name rfc3686. So ctr(aes) gives a chainable cipher with IV size 16 while the IPsec variant will be called rfc3686(ctr(aes)). This patch also adjusts gcm accordingly. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
Родитель
653ebd9c85
Коммит
5311f248b7
334
crypto/ctr.c
334
crypto/ctr.c
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@ -11,6 +11,7 @@
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*/
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#include <crypto/algapi.h>
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#include <crypto/ctr.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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@ -19,16 +20,13 @@
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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struct ctr_instance_ctx {
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struct crypto_spawn alg;
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unsigned int noncesize;
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unsigned int ivsize;
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unsigned int countersize;
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};
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struct crypto_ctr_ctx {
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struct crypto_cipher *child;
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u8 *nonce;
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};
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struct crypto_rfc3686_ctx {
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struct crypto_blkcipher *child;
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u8 nonce[CTR_RFC3686_NONCE_SIZE];
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};
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static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
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@ -36,18 +34,7 @@ static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
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{
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_cipher *child = ctx->child;
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struct ctr_instance_ctx *ictx =
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crypto_instance_ctx(crypto_tfm_alg_instance(parent));
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unsigned int noncelen = ictx->noncesize;
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int err = 0;
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/* the nonce is stored in bytes at end of key */
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if (keylen < noncelen)
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return -EINVAL;
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memcpy(ctx->nonce, key + (keylen - noncelen), noncelen);
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keylen -= noncelen;
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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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@ -60,11 +47,13 @@ static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
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}
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static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm, u8 *ctrblk,
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unsigned int countersize)
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struct crypto_cipher *tfm)
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{
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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u8 *keystream = ctrblk + bsize;
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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u8 *ctrblk = walk->iv;
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u8 tmp[bsize + alignmask];
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u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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@ -72,15 +61,17 @@ static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
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crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
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crypto_xor(keystream, src, nbytes);
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memcpy(dst, keystream, nbytes);
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crypto_inc(ctrblk, bsize);
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}
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static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm, u8 *ctrblk,
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unsigned int countersize)
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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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unsigned int bsize = crypto_cipher_blocksize(tfm);
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u8 *ctrblk = walk->iv;
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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@ -91,7 +82,7 @@ static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
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crypto_xor(dst, src, bsize);
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/* increment counter in counterblock */
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crypto_inc(ctrblk + bsize - countersize, countersize);
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crypto_inc(ctrblk, bsize);
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src += bsize;
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dst += bsize;
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@ -101,15 +92,17 @@ static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
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}
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static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm, u8 *ctrblk,
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unsigned int countersize)
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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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unsigned int bsize = crypto_cipher_blocksize(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *ctrblk = walk->iv;
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u8 *src = walk->src.virt.addr;
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u8 *keystream = ctrblk + bsize;
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u8 tmp[bsize + alignmask];
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u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
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do {
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/* create keystream */
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@ -117,7 +110,7 @@ static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
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crypto_xor(src, keystream, bsize);
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/* increment counter in counterblock */
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crypto_inc(ctrblk + bsize - countersize, countersize);
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crypto_inc(ctrblk, bsize);
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src += bsize;
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} while ((nbytes -= bsize) >= bsize);
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@ -134,41 +127,22 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc,
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struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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unsigned int bsize = crypto_cipher_blocksize(child);
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struct ctr_instance_ctx *ictx =
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crypto_instance_ctx(crypto_tfm_alg_instance(&tfm->base));
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unsigned long alignmask = crypto_cipher_alignmask(child) |
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(__alignof__(u32) - 1);
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u8 cblk[bsize * 2 + alignmask];
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u8 *counterblk = (u8 *)ALIGN((unsigned long)cblk, alignmask + 1);
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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_block(desc, &walk, bsize);
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/* set up counter block */
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memset(counterblk, 0 , bsize);
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memcpy(counterblk, ctx->nonce, ictx->noncesize);
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memcpy(counterblk + ictx->noncesize, walk.iv, ictx->ivsize);
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/* initialize counter portion of counter block */
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crypto_inc(counterblk + bsize - ictx->countersize, ictx->countersize);
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while (walk.nbytes >= bsize) {
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if (walk.src.virt.addr == walk.dst.virt.addr)
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nbytes = crypto_ctr_crypt_inplace(&walk, child,
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counterblk,
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ictx->countersize);
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nbytes = crypto_ctr_crypt_inplace(&walk, child);
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else
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nbytes = crypto_ctr_crypt_segment(&walk, child,
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counterblk,
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ictx->countersize);
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nbytes = crypto_ctr_crypt_segment(&walk, child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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if (walk.nbytes) {
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crypto_ctr_crypt_final(&walk, child, counterblk,
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ictx->countersize);
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crypto_ctr_crypt_final(&walk, child);
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err = blkcipher_walk_done(desc, &walk, 0);
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}
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@ -178,15 +152,11 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc,
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static int crypto_ctr_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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struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct crypto_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_cipher *cipher;
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ctx->nonce = kzalloc(ictx->noncesize, GFP_KERNEL);
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if (!ctx->nonce)
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return -ENOMEM;
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cipher = crypto_spawn_cipher(&ictx->alg);
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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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@ -199,7 +169,6 @@ static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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kfree(ctx->nonce);
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crypto_free_cipher(ctx->child);
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}
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@ -207,10 +176,6 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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struct ctr_instance_ctx *ictx;
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unsigned int noncesize;
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unsigned int ivsize;
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unsigned int countersize;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
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@ -222,71 +187,28 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
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if (IS_ERR(alg))
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return ERR_PTR(PTR_ERR(alg));
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err = crypto_attr_u32(tb[2], &noncesize);
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if (err)
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goto out_put_alg;
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err = crypto_attr_u32(tb[3], &ivsize);
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if (err)
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goto out_put_alg;
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err = crypto_attr_u32(tb[4], &countersize);
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if (err)
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goto out_put_alg;
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/* verify size of nonce + iv + counter
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* counter must be >= 4 bytes.
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*/
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/* Block size must be >= 4 bytes. */
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err = -EINVAL;
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if (((noncesize + ivsize + countersize) < alg->cra_blocksize) ||
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((noncesize + ivsize) > alg->cra_blocksize) ||
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(countersize > alg->cra_blocksize) || (countersize < 4))
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if (alg->cra_blocksize < 4)
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goto out_put_alg;
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/* If this is false we'd fail the alignment of crypto_inc. */
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if ((alg->cra_blocksize - countersize) % 4)
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if (alg->cra_blocksize % 4)
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goto out_put_alg;
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inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
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err = -ENOMEM;
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if (!inst)
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goto out_put_alg;
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inst = crypto_alloc_instance("ctr", alg);
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if (IS_ERR(inst))
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goto out;
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
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"ctr(%s,%u,%u,%u)", alg->cra_name, noncesize,
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ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
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goto err_free_inst;
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}
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"ctr(%s,%u,%u,%u)", alg->cra_driver_name, noncesize,
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ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
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goto err_free_inst;
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}
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ictx = crypto_instance_ctx(inst);
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ictx->noncesize = noncesize;
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ictx->ivsize = ivsize;
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ictx->countersize = countersize;
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err = crypto_init_spawn(&ictx->alg, alg, inst,
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CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
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if (err)
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goto err_free_inst;
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err = 0;
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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 = 1;
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inst->alg.cra_alignmask = alg->cra_alignmask | (__alignof__(u32) - 1);
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inst->alg.cra_type = &crypto_blkcipher_type;
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inst->alg.cra_blkcipher.ivsize = ivsize;
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inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize
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+ noncesize;
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inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize
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+ noncesize;
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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.cra_ctxsize = sizeof(struct crypto_ctr_ctx);
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@ -297,24 +219,18 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
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inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
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inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;
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err_free_inst:
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if (err)
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kfree(inst);
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out:
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crypto_mod_put(alg);
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return inst;
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out_put_alg:
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crypto_mod_put(alg);
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if (err)
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inst = ERR_PTR(err);
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return inst;
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inst = ERR_PTR(err);
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goto out;
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}
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static void crypto_ctr_free(struct crypto_instance *inst)
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{
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struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
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crypto_drop_spawn(&ictx->alg);
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crypto_drop_spawn(crypto_instance_ctx(inst));
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kfree(inst);
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}
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@ -325,13 +241,174 @@ static struct crypto_template crypto_ctr_tmpl = {
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.module = THIS_MODULE,
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};
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static int crypto_rfc3686_setkey(struct crypto_tfm *parent, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_blkcipher *child = ctx->child;
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int err;
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/* the nonce is stored in bytes at end of key */
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if (keylen < CTR_RFC3686_NONCE_SIZE)
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return -EINVAL;
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memcpy(ctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
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CTR_RFC3686_NONCE_SIZE);
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keylen -= CTR_RFC3686_NONCE_SIZE;
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crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_blkcipher_setkey(child, key, keylen);
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crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
|
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CRYPTO_TFM_RES_MASK);
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|
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return err;
|
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}
|
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|
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static int crypto_rfc3686_crypt(struct blkcipher_desc *desc,
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struct scatterlist *dst,
|
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struct scatterlist *src, unsigned int nbytes)
|
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{
|
||||
struct crypto_blkcipher *tfm = desc->tfm;
|
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struct crypto_rfc3686_ctx *ctx = crypto_blkcipher_ctx(tfm);
|
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struct crypto_blkcipher *child = ctx->child;
|
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unsigned long alignmask = crypto_blkcipher_alignmask(tfm);
|
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u8 ivblk[CTR_RFC3686_BLOCK_SIZE + alignmask];
|
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u8 *iv = PTR_ALIGN(ivblk + 0, alignmask + 1);
|
||||
u8 *info = desc->info;
|
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int err;
|
||||
|
||||
/* set up counter block */
|
||||
memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
|
||||
memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);
|
||||
|
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/* initialize counter portion of counter block */
|
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*(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
|
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cpu_to_be32(1);
|
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|
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desc->tfm = child;
|
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desc->info = iv;
|
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err = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
|
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desc->tfm = tfm;
|
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desc->info = info;
|
||||
|
||||
return err;
|
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}
|
||||
|
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static int crypto_rfc3686_init_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
||||
struct crypto_spawn *spawn = crypto_instance_ctx(inst);
|
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struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
|
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struct crypto_blkcipher *cipher;
|
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|
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cipher = crypto_spawn_blkcipher(spawn);
|
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if (IS_ERR(cipher))
|
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return PTR_ERR(cipher);
|
||||
|
||||
ctx->child = cipher;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void crypto_rfc3686_exit_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
|
||||
crypto_free_blkcipher(ctx->child);
|
||||
}
|
||||
|
||||
static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
|
||||
{
|
||||
struct crypto_instance *inst;
|
||||
struct crypto_alg *alg;
|
||||
int err;
|
||||
|
||||
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
|
||||
if (err)
|
||||
return ERR_PTR(err);
|
||||
|
||||
alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
CRYPTO_ALG_TYPE_MASK);
|
||||
err = PTR_ERR(alg);
|
||||
if (IS_ERR(alg))
|
||||
return ERR_PTR(err);
|
||||
|
||||
/* We only support 16-byte blocks. */
|
||||
err = -EINVAL;
|
||||
if (alg->cra_blkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
|
||||
goto out_put_alg;
|
||||
|
||||
/* Not a stream cipher? */
|
||||
if (alg->cra_blocksize != 1)
|
||||
goto out_put_alg;
|
||||
|
||||
inst = crypto_alloc_instance("rfc3686", alg);
|
||||
if (IS_ERR(inst))
|
||||
goto out;
|
||||
|
||||
inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
|
||||
inst->alg.cra_priority = alg->cra_priority;
|
||||
inst->alg.cra_blocksize = 1;
|
||||
inst->alg.cra_alignmask = alg->cra_alignmask;
|
||||
inst->alg.cra_type = &crypto_blkcipher_type;
|
||||
|
||||
inst->alg.cra_blkcipher.ivsize = CTR_RFC3686_IV_SIZE;
|
||||
inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize
|
||||
+ CTR_RFC3686_NONCE_SIZE;
|
||||
inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize
|
||||
+ CTR_RFC3686_NONCE_SIZE;
|
||||
|
||||
inst->alg.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);
|
||||
|
||||
inst->alg.cra_init = crypto_rfc3686_init_tfm;
|
||||
inst->alg.cra_exit = crypto_rfc3686_exit_tfm;
|
||||
|
||||
inst->alg.cra_blkcipher.setkey = crypto_rfc3686_setkey;
|
||||
inst->alg.cra_blkcipher.encrypt = crypto_rfc3686_crypt;
|
||||
inst->alg.cra_blkcipher.decrypt = crypto_rfc3686_crypt;
|
||||
|
||||
out:
|
||||
crypto_mod_put(alg);
|
||||
return inst;
|
||||
|
||||
out_put_alg:
|
||||
inst = ERR_PTR(err);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static struct crypto_template crypto_rfc3686_tmpl = {
|
||||
.name = "rfc3686",
|
||||
.alloc = crypto_rfc3686_alloc,
|
||||
.free = crypto_ctr_free,
|
||||
.module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init crypto_ctr_module_init(void)
|
||||
{
|
||||
return crypto_register_template(&crypto_ctr_tmpl);
|
||||
int err;
|
||||
|
||||
err = crypto_register_template(&crypto_ctr_tmpl);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = crypto_register_template(&crypto_rfc3686_tmpl);
|
||||
if (err)
|
||||
goto out_drop_ctr;
|
||||
|
||||
out:
|
||||
return err;
|
||||
|
||||
out_drop_ctr:
|
||||
crypto_unregister_template(&crypto_ctr_tmpl);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static void __exit crypto_ctr_module_exit(void)
|
||||
{
|
||||
crypto_unregister_template(&crypto_rfc3686_tmpl);
|
||||
crypto_unregister_template(&crypto_ctr_tmpl);
|
||||
}
|
||||
|
||||
|
|
@ -340,3 +417,4 @@ module_exit(crypto_ctr_module_exit);
|
|||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("CTR Counter block mode");
|
||||
MODULE_ALIAS("rfc3686");
|
||||
|
|
|
|||
|
|
@ -160,7 +160,7 @@ static void crypto_gcm_ghash_final_xor(struct crypto_gcm_ghash_ctx *ctx,
|
|||
|
||||
static inline void crypto_gcm_set_counter(u8 *counterblock, u32 value)
|
||||
{
|
||||
*((u32 *)&counterblock[12]) = cpu_to_be32(value);
|
||||
*((u32 *)&counterblock[12]) = cpu_to_be32(value + 1);
|
||||
}
|
||||
|
||||
static int crypto_gcm_encrypt_counter(struct crypto_aead *aead, u8 *block,
|
||||
|
|
@ -400,9 +400,8 @@ static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
|
|||
return inst;
|
||||
|
||||
inst = ERR_PTR(ENAMETOOLONG);
|
||||
if (snprintf(
|
||||
ctr_name, CRYPTO_MAX_ALG_NAME,
|
||||
"ctr(%s,0,16,4)", cipher->cra_name) >= CRYPTO_MAX_ALG_NAME)
|
||||
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
|
||||
cipher->cra_name) >= CRYPTO_MAX_ALG_NAME)
|
||||
return inst;
|
||||
|
||||
ctr = crypto_alg_mod_lookup(ctr_name, CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
|
|
|
|||
|
|
@ -1193,9 +1193,9 @@ static void do_test(void)
|
|||
AES_XTS_ENC_TEST_VECTORS);
|
||||
test_cipher("xts(aes)", DECRYPT, aes_xts_dec_tv_template,
|
||||
AES_XTS_DEC_TEST_VECTORS);
|
||||
test_cipher("ctr(aes,4,8,4)", ENCRYPT, aes_ctr_enc_tv_template,
|
||||
test_cipher("rfc3686(ctr(aes))", ENCRYPT, aes_ctr_enc_tv_template,
|
||||
AES_CTR_ENC_TEST_VECTORS);
|
||||
test_cipher("ctr(aes,4,8,4)", DECRYPT, aes_ctr_dec_tv_template,
|
||||
test_cipher("rfc3686(ctr(aes))", DECRYPT, aes_ctr_dec_tv_template,
|
||||
AES_CTR_DEC_TEST_VECTORS);
|
||||
test_aead("gcm(aes)", ENCRYPT, aes_gcm_enc_tv_template,
|
||||
AES_GCM_ENC_TEST_VECTORS);
|
||||
|
|
@ -1394,9 +1394,9 @@ static void do_test(void)
|
|||
AES_XTS_ENC_TEST_VECTORS);
|
||||
test_cipher("xts(aes)", DECRYPT, aes_xts_dec_tv_template,
|
||||
AES_XTS_DEC_TEST_VECTORS);
|
||||
test_cipher("ctr(aes,4,8,4)", ENCRYPT, aes_ctr_enc_tv_template,
|
||||
test_cipher("rfc3686(ctr(aes))", ENCRYPT, aes_ctr_enc_tv_template,
|
||||
AES_CTR_ENC_TEST_VECTORS);
|
||||
test_cipher("ctr(aes,4,8,4)", DECRYPT, aes_ctr_dec_tv_template,
|
||||
test_cipher("rfc3686(ctr(aes))", DECRYPT, aes_ctr_dec_tv_template,
|
||||
AES_CTR_DEC_TEST_VECTORS);
|
||||
break;
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,20 @@
|
|||
/*
|
||||
* CTR: Counter mode
|
||||
*
|
||||
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the Free
|
||||
* Software Foundation; either version 2 of the License, or (at your option)
|
||||
* any later version.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _CRYPTO_CTR_H
|
||||
#define _CRYPTO_CTR_H
|
||||
|
||||
#define CTR_RFC3686_NONCE_SIZE 4
|
||||
#define CTR_RFC3686_IV_SIZE 8
|
||||
#define CTR_RFC3686_BLOCK_SIZE 16
|
||||
|
||||
#endif /* _CRYPTO_CTR_H */
|
||||
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