Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5311f248b7764ba8b59e6d477355f766e5609686
Commit:     5311f248b7764ba8b59e6d477355f766e5609686
Parent:     653ebd9c8510a7d647ed23e66e1338f848ebdbab
Author:     Herbert Xu <[EMAIL PROTECTED]>
AuthorDate: Mon Dec 17 21:34:32 2007 +0800
Committer:  Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Fri Jan 11 08:16:41 2008 +1100

    [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 <[EMAIL PROTECTED]>
---
 crypto/ctr.c         |  334 +++++++++++++++++++++++++++++++-------------------
 crypto/gcm.c         |    7 +-
 crypto/tcrypt.c      |    8 +-
 include/crypto/ctr.h |   20 +++
 4 files changed, 233 insertions(+), 136 deletions(-)

diff --git a/crypto/ctr.c b/crypto/ctr.c
index 57da7d0..1052b31 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -11,6 +11,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/ctr.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -19,16 +20,13 @@
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 
-struct ctr_instance_ctx {
-       struct crypto_spawn alg;
-       unsigned int noncesize;
-       unsigned int ivsize;
-       unsigned int countersize;
-};
-
 struct crypto_ctr_ctx {
        struct crypto_cipher *child;
-       u8 *nonce;
+};
+
+struct crypto_rfc3686_ctx {
+       struct crypto_blkcipher *child;
+       u8 nonce[CTR_RFC3686_NONCE_SIZE];
 };
 
 static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
@@ -36,18 +34,7 @@ static int crypto_ctr_setkey(struct crypto_tfm *parent, 
const u8 *key,
 {
        struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
        struct crypto_cipher *child = ctx->child;
-       struct ctr_instance_ctx *ictx =
-               crypto_instance_ctx(crypto_tfm_alg_instance(parent));
-       unsigned int noncelen = ictx->noncesize;
-       int err = 0;
-
-       /* the nonce is stored in bytes at end of key */
-       if (keylen < noncelen)
-               return  -EINVAL;
-
-       memcpy(ctx->nonce, key + (keylen - noncelen), noncelen);
-
-       keylen -=  noncelen;
+       int err;
 
        crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
        crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
@@ -60,11 +47,13 @@ static int crypto_ctr_setkey(struct crypto_tfm *parent, 
const u8 *key,
 }
 
 static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
-                                  struct crypto_cipher *tfm, u8 *ctrblk,
-                                  unsigned int countersize)
+                                  struct crypto_cipher *tfm)
 {
        unsigned int bsize = crypto_cipher_blocksize(tfm);
-       u8 *keystream = ctrblk + bsize;
+       unsigned long alignmask = crypto_cipher_alignmask(tfm);
+       u8 *ctrblk = walk->iv;
+       u8 tmp[bsize + alignmask];
+       u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
        u8 *src = walk->src.virt.addr;
        u8 *dst = walk->dst.virt.addr;
        unsigned int nbytes = walk->nbytes;
@@ -72,15 +61,17 @@ static void crypto_ctr_crypt_final(struct blkcipher_walk 
*walk,
        crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
        crypto_xor(keystream, src, nbytes);
        memcpy(dst, keystream, nbytes);
+
+       crypto_inc(ctrblk, bsize);
 }
 
 static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
-                                   struct crypto_cipher *tfm, u8 *ctrblk,
-                                   unsigned int countersize)
+                                   struct crypto_cipher *tfm)
 {
        void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
                   crypto_cipher_alg(tfm)->cia_encrypt;
        unsigned int bsize = crypto_cipher_blocksize(tfm);
+       u8 *ctrblk = walk->iv;
        u8 *src = walk->src.virt.addr;
        u8 *dst = walk->dst.virt.addr;
        unsigned int nbytes = walk->nbytes;
@@ -91,7 +82,7 @@ static int crypto_ctr_crypt_segment(struct blkcipher_walk 
*walk,
                crypto_xor(dst, src, bsize);
 
                /* increment counter in counterblock */
-               crypto_inc(ctrblk + bsize - countersize, countersize);
+               crypto_inc(ctrblk, bsize);
 
                src += bsize;
                dst += bsize;
@@ -101,15 +92,17 @@ static int crypto_ctr_crypt_segment(struct blkcipher_walk 
*walk,
 }
 
 static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
-                                   struct crypto_cipher *tfm, u8 *ctrblk,
-                                   unsigned int countersize)
+                                   struct crypto_cipher *tfm)
 {
        void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
                   crypto_cipher_alg(tfm)->cia_encrypt;
        unsigned int bsize = crypto_cipher_blocksize(tfm);
+       unsigned long alignmask = crypto_cipher_alignmask(tfm);
        unsigned int nbytes = walk->nbytes;
+       u8 *ctrblk = walk->iv;
        u8 *src = walk->src.virt.addr;
-       u8 *keystream = ctrblk + bsize;
+       u8 tmp[bsize + alignmask];
+       u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
 
        do {
                /* create keystream */
@@ -117,7 +110,7 @@ static int crypto_ctr_crypt_inplace(struct blkcipher_walk 
*walk,
                crypto_xor(src, keystream, bsize);
 
                /* increment counter in counterblock */
-               crypto_inc(ctrblk + bsize - countersize, countersize);
+               crypto_inc(ctrblk, bsize);
 
                src += bsize;
        } while ((nbytes -= bsize) >= bsize);
@@ -134,41 +127,22 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc,
        struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
        struct crypto_cipher *child = ctx->child;
        unsigned int bsize = crypto_cipher_blocksize(child);
-       struct ctr_instance_ctx *ictx =
-               crypto_instance_ctx(crypto_tfm_alg_instance(&tfm->base));
-       unsigned long alignmask = crypto_cipher_alignmask(child) |
-                                 (__alignof__(u32) - 1);
-       u8 cblk[bsize * 2 + alignmask];
-       u8 *counterblk = (u8 *)ALIGN((unsigned long)cblk, alignmask + 1);
        int err;
 
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt_block(desc, &walk, bsize);
 
-       /* set up counter block */
-       memset(counterblk, 0 , bsize);
-       memcpy(counterblk, ctx->nonce, ictx->noncesize);
-       memcpy(counterblk + ictx->noncesize, walk.iv, ictx->ivsize);
-
-       /* initialize counter portion of counter block */
-       crypto_inc(counterblk + bsize - ictx->countersize, ictx->countersize);
-
        while (walk.nbytes >= bsize) {
                if (walk.src.virt.addr == walk.dst.virt.addr)
-                       nbytes = crypto_ctr_crypt_inplace(&walk, child,
-                                                         counterblk,
-                                                         ictx->countersize);
+                       nbytes = crypto_ctr_crypt_inplace(&walk, child);
                else
-                       nbytes = crypto_ctr_crypt_segment(&walk, child,
-                                                         counterblk,
-                                                         ictx->countersize);
+                       nbytes = crypto_ctr_crypt_segment(&walk, child);
 
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
 
        if (walk.nbytes) {
-               crypto_ctr_crypt_final(&walk, child, counterblk,
-                                      ictx->countersize);
+               crypto_ctr_crypt_final(&walk, child);
                err = blkcipher_walk_done(desc, &walk, 0);
        }
 
@@ -178,15 +152,11 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc,
 static int crypto_ctr_init_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_instance *inst = (void *)tfm->__crt_alg;
-       struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
+       struct crypto_spawn *spawn = crypto_instance_ctx(inst);
        struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
        struct crypto_cipher *cipher;
 
-       ctx->nonce = kzalloc(ictx->noncesize, GFP_KERNEL);
-       if (!ctx->nonce)
-               return -ENOMEM;
-
-       cipher = crypto_spawn_cipher(&ictx->alg);
+       cipher = crypto_spawn_cipher(spawn);
        if (IS_ERR(cipher))
                return PTR_ERR(cipher);
 
@@ -199,7 +169,6 @@ static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       kfree(ctx->nonce);
        crypto_free_cipher(ctx->child);
 }
 
@@ -207,10 +176,6 @@ static struct crypto_instance *crypto_ctr_alloc(struct 
rtattr **tb)
 {
        struct crypto_instance *inst;
        struct crypto_alg *alg;
-       struct ctr_instance_ctx *ictx;
-       unsigned int noncesize;
-       unsigned int ivsize;
-       unsigned int countersize;
        int err;
 
        err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
@@ -222,71 +187,28 @@ static struct crypto_instance *crypto_ctr_alloc(struct 
rtattr **tb)
        if (IS_ERR(alg))
                return ERR_PTR(PTR_ERR(alg));
 
-       err = crypto_attr_u32(tb[2], &noncesize);
-       if (err)
-               goto out_put_alg;
-
-       err = crypto_attr_u32(tb[3], &ivsize);
-       if (err)
-               goto out_put_alg;
-
-       err = crypto_attr_u32(tb[4], &countersize);
-       if (err)
-               goto out_put_alg;
-
-       /* verify size of nonce + iv + counter
-        * counter must be >= 4 bytes.
-        */
+       /* Block size must be >= 4 bytes. */
        err = -EINVAL;
-       if (((noncesize + ivsize + countersize) < alg->cra_blocksize) ||
-           ((noncesize + ivsize) > alg->cra_blocksize) ||
-           (countersize > alg->cra_blocksize) || (countersize < 4))
+       if (alg->cra_blocksize < 4)
                goto out_put_alg;
 
        /* If this is false we'd fail the alignment of crypto_inc. */
-       if ((alg->cra_blocksize - countersize) % 4)
+       if (alg->cra_blocksize % 4)
                goto out_put_alg;
 
-       inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
-       err = -ENOMEM;
-       if (!inst)
-               goto out_put_alg;
-
-       err = -ENAMETOOLONG;
-       if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
-                    "ctr(%s,%u,%u,%u)", alg->cra_name, noncesize,
-                    ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
-               goto err_free_inst;
-       }
-
-       if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
-                    "ctr(%s,%u,%u,%u)", alg->cra_driver_name, noncesize,
-                    ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
-               goto err_free_inst;
-       }
-
-       ictx = crypto_instance_ctx(inst);
-       ictx->noncesize = noncesize;
-       ictx->ivsize = ivsize;
-       ictx->countersize = countersize;
-
-       err = crypto_init_spawn(&ictx->alg, alg, inst,
-               CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
-       if (err)
-               goto err_free_inst;
+       inst = crypto_alloc_instance("ctr", alg);
+       if (IS_ERR(inst))
+               goto out;
 
-       err = 0;
        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 | (__alignof__(u32) - 1);
        inst->alg.cra_type = &crypto_blkcipher_type;
 
-       inst->alg.cra_blkcipher.ivsize = ivsize;
-       inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize
-                                             + noncesize;
-       inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize
-                                             + noncesize;
+       inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
+       inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
+       inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
 
        inst->alg.cra_ctxsize = sizeof(struct crypto_ctr_ctx);
 
@@ -297,24 +219,18 @@ static struct crypto_instance *crypto_ctr_alloc(struct 
rtattr **tb)
        inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
        inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;
 
-err_free_inst:
-       if (err)
-               kfree(inst);
-
-out_put_alg:
+out:
        crypto_mod_put(alg);
-
-       if (err)
-               inst = ERR_PTR(err);
-
        return inst;
+
+out_put_alg:
+       inst = ERR_PTR(err);
+       goto out;
 }
 
 static void crypto_ctr_free(struct crypto_instance *inst)
 {
-       struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
-
-       crypto_drop_spawn(&ictx->alg);
+       crypto_drop_spawn(crypto_instance_ctx(inst));
        kfree(inst);
 }
 
@@ -325,13 +241,174 @@ static struct crypto_template crypto_ctr_tmpl = {
        .module = THIS_MODULE,
 };
 
+static int crypto_rfc3686_setkey(struct crypto_tfm *parent, const u8 *key,
+                                unsigned int keylen)
+{
+       struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(parent);
+       struct crypto_blkcipher *child = ctx->child;
+       int err;
+
+       /* the nonce is stored in bytes at end of key */
+       if (keylen < CTR_RFC3686_NONCE_SIZE)
+               return -EINVAL;
+
+       memcpy(ctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
+              CTR_RFC3686_NONCE_SIZE);
+
+       keylen -= CTR_RFC3686_NONCE_SIZE;
+
+       crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+       crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
+                                         CRYPTO_TFM_REQ_MASK);
+       err = crypto_blkcipher_setkey(child, key, keylen);
+       crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
+                                    CRYPTO_TFM_RES_MASK);
+
+       return err;
+}
+
+static int crypto_rfc3686_crypt(struct blkcipher_desc *desc,
+                               struct scatterlist *dst,
+                               struct scatterlist *src, unsigned int nbytes)
+{
+       struct crypto_blkcipher *tfm = desc->tfm;
+       struct crypto_rfc3686_ctx *ctx = crypto_blkcipher_ctx(tfm);
+       struct crypto_blkcipher *child = ctx->child;
+       unsigned long alignmask = crypto_blkcipher_alignmask(tfm);
+       u8 ivblk[CTR_RFC3686_BLOCK_SIZE + alignmask];
+       u8 *iv = PTR_ALIGN(ivblk + 0, alignmask + 1);
+       u8 *info = desc->info;
+       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);
+
+       /* initialize counter portion of counter block */
+       *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
+               cpu_to_be32(1);
+
+       desc->tfm = child;
+       desc->info = iv;
+       err = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
+       desc->tfm = tfm;
+       desc->info = info;
+
+       return err;
+}
+
+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);
+       struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
+       struct crypto_blkcipher *cipher;
+
+       cipher = crypto_spawn_blkcipher(spawn);
+       if (IS_ERR(cipher))
+               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");
diff --git a/crypto/gcm.c b/crypto/gcm.c
index 0818317..c54d478 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -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,
diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index 0cfb8eb..1142b49 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -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;
 
diff --git a/include/crypto/ctr.h b/include/crypto/ctr.h
new file mode 100644
index 0000000..4180fc0
--- /dev/null
+++ b/include/crypto/ctr.h
@@ -0,0 +1,20 @@
+/*
+ * CTR: Counter mode
+ *
+ * Copyright (c) 2007 Herbert Xu <[EMAIL PROTECTED]>
+ *
+ * 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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