Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[~shefty/rdma-dev.git] / crypto / ctr.c
index 095dcb6..f2b94f2 100644 (file)
@@ -12,6 +12,7 @@
 
 #include <crypto/algapi.h>
 #include <crypto/ctr.h>
+#include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -25,10 +26,15 @@ struct crypto_ctr_ctx {
 };
 
 struct crypto_rfc3686_ctx {
-       struct crypto_blkcipher *child;
+       struct crypto_ablkcipher *child;
        u8 nonce[CTR_RFC3686_NONCE_SIZE];
 };
 
+struct crypto_rfc3686_req_ctx {
+       u8 iv[CTR_RFC3686_BLOCK_SIZE];
+       struct ablkcipher_request subreq CRYPTO_MINALIGN_ATTR;
+};
+
 static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
                             unsigned int keylen)
 {
@@ -243,11 +249,11 @@ 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)
+static int crypto_rfc3686_setkey(struct crypto_ablkcipher *parent,
+                                const u8 *key, unsigned int keylen)
 {
-       struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(parent);
-       struct crypto_blkcipher *child = ctx->child;
+       struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(parent);
+       struct crypto_ablkcipher *child = ctx->child;
        int err;
 
        /* the nonce is stored in bytes at end of key */
@@ -259,59 +265,64 @@ static int crypto_rfc3686_setkey(struct crypto_tfm *parent, const u8 *key,
 
        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);
+       crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+       crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
+                                   CRYPTO_TFM_REQ_MASK);
+       err = crypto_ablkcipher_setkey(child, key, keylen);
+       crypto_ablkcipher_set_flags(parent, crypto_ablkcipher_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)
+static int crypto_rfc3686_crypt(struct ablkcipher_request *req)
 {
-       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;
+       struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
+       struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+       struct crypto_ablkcipher *child = ctx->child;
+       unsigned long align = crypto_ablkcipher_alignmask(tfm);
+       struct crypto_rfc3686_req_ctx *rctx =
+               (void *)PTR_ALIGN((u8 *)ablkcipher_request_ctx(req), align + 1);
+       struct ablkcipher_request *subreq = &rctx->subreq;
+       u8 *iv = rctx->iv;
 
        /* set up counter block */
        memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
-       memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);
+       memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->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;
+       ablkcipher_request_set_tfm(subreq, child);
+       ablkcipher_request_set_callback(subreq, req->base.flags,
+                                       req->base.complete, req->base.data);
+       ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->nbytes,
+                                    iv);
 
-       return err;
+       return crypto_ablkcipher_encrypt(subreq);
 }
 
 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_skcipher_spawn *spawn = crypto_instance_ctx(inst);
        struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
-       struct crypto_blkcipher *cipher;
+       struct crypto_ablkcipher *cipher;
+       unsigned long align;
 
-       cipher = crypto_spawn_blkcipher(spawn);
+       cipher = crypto_spawn_skcipher(spawn);
        if (IS_ERR(cipher))
                return PTR_ERR(cipher);
 
        ctx->child = cipher;
 
+       align = crypto_tfm_alg_alignmask(tfm);
+       align &= ~(crypto_tfm_ctx_alignment() - 1);
+       tfm->crt_ablkcipher.reqsize = align +
+               sizeof(struct crypto_rfc3686_req_ctx) +
+               crypto_ablkcipher_reqsize(cipher);
+
        return 0;
 }
 
@@ -319,73 +330,108 @@ static void crypto_rfc3686_exit_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       crypto_free_blkcipher(ctx->child);
+       crypto_free_ablkcipher(ctx->child);
 }
 
 static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
 {
+       struct crypto_attr_type *algt;
        struct crypto_instance *inst;
        struct crypto_alg *alg;
+       struct crypto_skcipher_spawn *spawn;
+       const char *cipher_name;
        int err;
 
-       err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
+       algt = crypto_get_attr_type(tb);
+       if (IS_ERR(algt))
+               return ERR_CAST(algt);
+
+       if ((algt->type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & algt->mask)
+               return ERR_PTR(-EINVAL);
+
+       cipher_name = crypto_attr_alg_name(tb[1]);
+       if (IS_ERR(cipher_name))
+               return ERR_CAST(cipher_name);
+
+       inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+       if (!inst)
+               return ERR_PTR(-ENOMEM);
+
+       spawn = crypto_instance_ctx(inst);
+
+       crypto_set_skcipher_spawn(spawn, inst);
+       err = crypto_grab_skcipher(spawn, cipher_name, 0,
+                                  crypto_requires_sync(algt->type,
+                                                       algt->mask));
        if (err)
-               return ERR_PTR(err);
+               goto err_free_inst;
 
-       alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_BLKCIPHER,
-                                 CRYPTO_ALG_TYPE_MASK);
-       if (IS_ERR(alg))
-               return ERR_CAST(alg);
+       alg = crypto_skcipher_spawn_alg(spawn);
 
        /* We only support 16-byte blocks. */
        err = -EINVAL;
-       if (alg->cra_blkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
-               goto out_put_alg;
+       if (alg->cra_ablkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
+               goto err_drop_spawn;
 
        /* Not a stream cipher? */
        if (alg->cra_blocksize != 1)
-               goto out_put_alg;
+               goto err_drop_spawn;
 
-       inst = crypto_alloc_instance("rfc3686", alg);
-       if (IS_ERR(inst))
-               goto out;
+       err = -ENAMETOOLONG;
+       if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)",
+                    alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
+               goto err_drop_spawn;
+       if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+                    "rfc3686(%s)", alg->cra_driver_name) >=
+                       CRYPTO_MAX_ALG_NAME)
+               goto err_drop_spawn;
 
-       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_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+                             (alg->cra_flags & CRYPTO_ALG_ASYNC);
+       inst->alg.cra_type = &crypto_ablkcipher_type;
+
+       inst->alg.cra_ablkcipher.ivsize = CTR_RFC3686_IV_SIZE;
+       inst->alg.cra_ablkcipher.min_keysize =
+               alg->cra_ablkcipher.min_keysize + CTR_RFC3686_NONCE_SIZE;
+       inst->alg.cra_ablkcipher.max_keysize =
+               alg->cra_ablkcipher.max_keysize + CTR_RFC3686_NONCE_SIZE;
 
-       inst->alg.cra_blkcipher.geniv = "seqiv";
+       inst->alg.cra_ablkcipher.geniv = "seqiv";
+
+       inst->alg.cra_ablkcipher.setkey = crypto_rfc3686_setkey;
+       inst->alg.cra_ablkcipher.encrypt = crypto_rfc3686_crypt;
+       inst->alg.cra_ablkcipher.decrypt = crypto_rfc3686_crypt;
 
        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;
+err_drop_spawn:
+       crypto_drop_skcipher(spawn);
+err_free_inst:
+       kfree(inst);
+       return ERR_PTR(err);
+}
+
+static void crypto_rfc3686_free(struct crypto_instance *inst)
+{
+       struct crypto_skcipher_spawn *spawn = crypto_instance_ctx(inst);
+
+       crypto_drop_skcipher(spawn);
+       kfree(inst);
 }
 
 static struct crypto_template crypto_rfc3686_tmpl = {
        .name = "rfc3686",
        .alloc = crypto_rfc3686_alloc,
-       .free = crypto_ctr_free,
+       .free = crypto_rfc3686_free,
        .module = THIS_MODULE,
 };