crypto: crc32 - add crc32 pclmulqdq implementation and wrappers for table implementation
[linux-3.10.git] / crypto / blkcipher.c
index 7a3e1a3..a8d85a1 100644 (file)
@@ -14,8 +14,8 @@
  *
  */
 
+#include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
-#include <linux/crypto.h>
 #include <linux/errno.h>
 #include <linux/hardirq.h>
 #include <linux/kernel.h>
@@ -24,6 +24,8 @@
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
 
 #include "internal.h"
 
@@ -41,22 +43,22 @@ static int blkcipher_walk_first(struct blkcipher_desc *desc,
 
 static inline void blkcipher_map_src(struct blkcipher_walk *walk)
 {
-       walk->src.virt.addr = scatterwalk_map(&walk->in, 0);
+       walk->src.virt.addr = scatterwalk_map(&walk->in);
 }
 
 static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
 {
-       walk->dst.virt.addr = scatterwalk_map(&walk->out, 1);
+       walk->dst.virt.addr = scatterwalk_map(&walk->out);
 }
 
 static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
 {
-       scatterwalk_unmap(walk->src.virt.addr, 0);
+       scatterwalk_unmap(walk->src.virt.addr);
 }
 
 static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
 {
-       scatterwalk_unmap(walk->dst.virt.addr, 1);
+       scatterwalk_unmap(walk->dst.virt.addr);
 }
 
 /* Get a spot of the specified length that does not straddle a page.
@@ -89,9 +91,9 @@ static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
                memcpy(walk->dst.virt.addr, walk->page, n);
                blkcipher_unmap_dst(walk);
        } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
-               blkcipher_unmap_src(walk);
                if (walk->flags & BLKCIPHER_WALK_DIFF)
                        blkcipher_unmap_dst(walk);
+               blkcipher_unmap_src(walk);
        }
 
        scatterwalk_advance(&walk->in, n);
@@ -124,6 +126,7 @@ int blkcipher_walk_done(struct blkcipher_desc *desc,
        scatterwalk_done(&walk->in, 0, nbytes);
        scatterwalk_done(&walk->out, 1, nbytes);
 
+err:
        walk->total = nbytes;
        walk->nbytes = nbytes;
 
@@ -132,7 +135,6 @@ int blkcipher_walk_done(struct blkcipher_desc *desc,
                return blkcipher_walk_next(desc, walk);
        }
 
-err:
        if (walk->iv != desc->info)
                memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
        if (walk->buffer != walk->page)
@@ -450,6 +452,11 @@ static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
        crt->setkey = async_setkey;
        crt->encrypt = async_encrypt;
        crt->decrypt = async_decrypt;
+       if (!alg->ivsize) {
+               crt->givencrypt = skcipher_null_givencrypt;
+               crt->givdecrypt = skcipher_null_givdecrypt;
+       }
+       crt->base = __crypto_ablkcipher_cast(tfm);
        crt->ivsize = alg->ivsize;
 
        return 0;
@@ -487,6 +494,35 @@ static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
                return crypto_init_blkcipher_ops_async(tfm);
 }
 
+#ifdef CONFIG_NET
+static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+       struct crypto_report_blkcipher rblkcipher;
+
+       snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "blkcipher");
+       snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
+                alg->cra_blkcipher.geniv ?: "<default>");
+
+       rblkcipher.blocksize = alg->cra_blocksize;
+       rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
+       rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
+       rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
+
+       if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
+                   sizeof(struct crypto_report_blkcipher), &rblkcipher))
+               goto nla_put_failure;
+       return 0;
+
+nla_put_failure:
+       return -EMSGSIZE;
+}
+#else
+static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+       return -ENOSYS;
+}
+#endif
+
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
        __attribute__ ((unused));
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
@@ -506,8 +542,191 @@ const struct crypto_type crypto_blkcipher_type = {
 #ifdef CONFIG_PROC_FS
        .show = crypto_blkcipher_show,
 #endif
+       .report = crypto_blkcipher_report,
 };
 EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
 
+static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
+                               const char *name, u32 type, u32 mask)
+{
+       struct crypto_alg *alg;
+       int err;
+
+       type = crypto_skcipher_type(type);
+       mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
+
+       alg = crypto_alg_mod_lookup(name, type, mask);
+       if (IS_ERR(alg))
+               return PTR_ERR(alg);
+
+       err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
+       crypto_mod_put(alg);
+       return err;
+}
+
+struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
+                                            struct rtattr **tb, u32 type,
+                                            u32 mask)
+{
+       struct {
+               int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
+                             unsigned int keylen);
+               int (*encrypt)(struct ablkcipher_request *req);
+               int (*decrypt)(struct ablkcipher_request *req);
+
+               unsigned int min_keysize;
+               unsigned int max_keysize;
+               unsigned int ivsize;
+
+               const char *geniv;
+       } balg;
+       const char *name;
+       struct crypto_skcipher_spawn *spawn;
+       struct crypto_attr_type *algt;
+       struct crypto_instance *inst;
+       struct crypto_alg *alg;
+       int err;
+
+       algt = crypto_get_attr_type(tb);
+       err = PTR_ERR(algt);
+       if (IS_ERR(algt))
+               return ERR_PTR(err);
+
+       if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
+           algt->mask)
+               return ERR_PTR(-EINVAL);
+
+       name = crypto_attr_alg_name(tb[1]);
+       err = PTR_ERR(name);
+       if (IS_ERR(name))
+               return ERR_PTR(err);
+
+       inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+       if (!inst)
+               return ERR_PTR(-ENOMEM);
+
+       spawn = crypto_instance_ctx(inst);
+
+       /* Ignore async algorithms if necessary. */
+       mask |= crypto_requires_sync(algt->type, algt->mask);
+
+       crypto_set_skcipher_spawn(spawn, inst);
+       err = crypto_grab_nivcipher(spawn, name, type, mask);
+       if (err)
+               goto err_free_inst;
+
+       alg = crypto_skcipher_spawn_alg(spawn);
+
+       if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+           CRYPTO_ALG_TYPE_BLKCIPHER) {
+               balg.ivsize = alg->cra_blkcipher.ivsize;
+               balg.min_keysize = alg->cra_blkcipher.min_keysize;
+               balg.max_keysize = alg->cra_blkcipher.max_keysize;
+
+               balg.setkey = async_setkey;
+               balg.encrypt = async_encrypt;
+               balg.decrypt = async_decrypt;
+
+               balg.geniv = alg->cra_blkcipher.geniv;
+       } else {
+               balg.ivsize = alg->cra_ablkcipher.ivsize;
+               balg.min_keysize = alg->cra_ablkcipher.min_keysize;
+               balg.max_keysize = alg->cra_ablkcipher.max_keysize;
+
+               balg.setkey = alg->cra_ablkcipher.setkey;
+               balg.encrypt = alg->cra_ablkcipher.encrypt;
+               balg.decrypt = alg->cra_ablkcipher.decrypt;
+
+               balg.geniv = alg->cra_ablkcipher.geniv;
+       }
+
+       err = -EINVAL;
+       if (!balg.ivsize)
+               goto err_drop_alg;
+
+       /*
+        * This is only true if we're constructing an algorithm with its
+        * default IV generator.  For the default generator we elide the
+        * template name and double-check the IV generator.
+        */
+       if (algt->mask & CRYPTO_ALG_GENIV) {
+               if (!balg.geniv)
+                       balg.geniv = crypto_default_geniv(alg);
+               err = -EAGAIN;
+               if (strcmp(tmpl->name, balg.geniv))
+                       goto err_drop_alg;
+
+               memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+               memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
+                      CRYPTO_MAX_ALG_NAME);
+       } else {
+               err = -ENAMETOOLONG;
+               if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+                            "%s(%s)", tmpl->name, alg->cra_name) >=
+                   CRYPTO_MAX_ALG_NAME)
+                       goto err_drop_alg;
+               if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+                            "%s(%s)", tmpl->name, alg->cra_driver_name) >=
+                   CRYPTO_MAX_ALG_NAME)
+                       goto err_drop_alg;
+       }
+
+       inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV;
+       inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
+       inst->alg.cra_priority = alg->cra_priority;
+       inst->alg.cra_blocksize = alg->cra_blocksize;
+       inst->alg.cra_alignmask = alg->cra_alignmask;
+       inst->alg.cra_type = &crypto_givcipher_type;
+
+       inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
+       inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
+       inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
+       inst->alg.cra_ablkcipher.geniv = balg.geniv;
+
+       inst->alg.cra_ablkcipher.setkey = balg.setkey;
+       inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
+       inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
+
+out:
+       return inst;
+
+err_drop_alg:
+       crypto_drop_skcipher(spawn);
+err_free_inst:
+       kfree(inst);
+       inst = ERR_PTR(err);
+       goto out;
+}
+EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
+
+void skcipher_geniv_free(struct crypto_instance *inst)
+{
+       crypto_drop_skcipher(crypto_instance_ctx(inst));
+       kfree(inst);
+}
+EXPORT_SYMBOL_GPL(skcipher_geniv_free);
+
+int skcipher_geniv_init(struct crypto_tfm *tfm)
+{
+       struct crypto_instance *inst = (void *)tfm->__crt_alg;
+       struct crypto_ablkcipher *cipher;
+
+       cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
+       if (IS_ERR(cipher))
+               return PTR_ERR(cipher);
+
+       tfm->crt_ablkcipher.base = cipher;
+       tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(skcipher_geniv_init);
+
+void skcipher_geniv_exit(struct crypto_tfm *tfm)
+{
+       crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
+}
+EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Generic block chaining cipher type");