2.6.25

 crypto

diff --git a/crypto/gcm.c b/crypto/gcm.c
new file mode 100644
index 0000000..e70afd0
--- /dev/null
+++ b/crypto/gcm.c
@@ -0,0 +1,823 @@
+/*
+ * GCM: Galois/Counter Mode.
+ *
+ * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <crypto/gf128mul.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+struct gcm_instance_ctx {
+   struct crypto_skcipher_spawn ctr;
+};
+
+struct crypto_gcm_ctx {
+   struct crypto_ablkcipher *ctr;
+   struct gf128mul_4k *gf128;
+};
+
+struct crypto_rfc4106_ctx {
+   struct crypto_aead *child;
+   u8 nonce[4];
+};
+
+struct crypto_gcm_ghash_ctx {
+   u32 bytes;
+   u32 flags;
+   struct gf128mul_4k *gf128;
+   u8 buffer[16];
+};
+
+struct crypto_gcm_req_priv_ctx {
+   u8 auth_tag[16];
+   u8 iauth_tag[16];
+   struct scatterlist src[2];
+   struct scatterlist dst[2];
+   struct crypto_gcm_ghash_ctx ghash;
+   struct ablkcipher_request abreq;
+};
+
+struct crypto_gcm_setkey_result {
+   int err;
+   struct completion completion;
+};
+
+static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
+   struct aead_request *req)
+{
+   unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
+
+   return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
+}
+
+static void crypto_gcm_ghash_init(struct crypto_gcm_ghash_ctx *ctx, u32 flags,
+              struct gf128mul_4k *gf128)
+{
+   ctx->bytes = 0;
+   ctx->flags = flags;
+   ctx->gf128 = gf128;
+   memset(ctx->buffer, 0, 16);
+}
+
+static void crypto_gcm_ghash_update(struct crypto_gcm_ghash_ctx *ctx,
+                const u8 *src, unsigned int srclen)
+{
+   u8 *dst = ctx->buffer;
+
+   if (ctx->bytes) {
+      int n = min(srclen, ctx->bytes);
+      u8 *pos = dst + (16 - ctx->bytes);
+
+      ctx->bytes -= n;
+      srclen -= n;
+
+      while (n--)
+         *pos++ ^= *src++;
+
+      if (!ctx->bytes)
+         gf128mul_4k_lle((be128 *)dst, ctx->gf128);
+   }
+
+   while (srclen >= 16) {
+      crypto_xor(dst, src, 16);
+      gf128mul_4k_lle((be128 *)dst, ctx->gf128);
+      src += 16;
+      srclen -= 16;
+   }
+
+   if (srclen) {
+      ctx->bytes = 16 - srclen;
+      while (srclen--)
+         *dst++ ^= *src++;
+   }
+}
+
+static void crypto_gcm_ghash_update_sg(struct crypto_gcm_ghash_ctx *ctx,
+                   struct scatterlist *sg, int len)
+{
+   struct scatter_walk walk;
+   u8 *src;
+   int n;
+
+   if (!len)
+      return;
+
+   scatterwalk_start(&walk, sg);
+
+   while (len) {
+      n = scatterwalk_clamp(&walk, len);
+
+      if (!n) {
+         scatterwalk_start(&walk, scatterwalk_sg_next(walk.sg));
+         n = scatterwalk_clamp(&walk, len);
+      }
+
+      src = scatterwalk_map(&walk, 0);
+
+      crypto_gcm_ghash_update(ctx, src, n);
+      len -= n;
+
+      scatterwalk_unmap(src, 0);
+      scatterwalk_advance(&walk, n);
+      scatterwalk_done(&walk, 0, len);
+      if (len)
+         crypto_yield(ctx->flags);
+   }
+}
+
+static void crypto_gcm_ghash_flush(struct crypto_gcm_ghash_ctx *ctx)
+{
+   u8 *dst = ctx->buffer;
+
+   if (ctx->bytes) {
+      u8 *tmp = dst + (16 - ctx->bytes);
+
+      while (ctx->bytes--)
+         *tmp++ ^= 0;
+
+      gf128mul_4k_lle((be128 *)dst, ctx->gf128);
+   }
+
+   ctx->bytes = 0;
+}
+
+static void crypto_gcm_ghash_final_xor(struct crypto_gcm_ghash_ctx *ctx,
+                   unsigned int authlen,
+                   unsigned int cryptlen, u8 *dst)
+{
+   u8 *buf = ctx->buffer;
+   u128 lengths;
+
+   lengths.a = cpu_to_be64(authlen * 8);
+   lengths.b = cpu_to_be64(cryptlen * 8);
+
+   crypto_gcm_ghash_flush(ctx);
+   crypto_xor(buf, (u8 *)&lengths, 16);
+   gf128mul_4k_lle((be128 *)buf, ctx->gf128);
+   crypto_xor(dst, buf, 16);
+}
+
+static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
+{
+   struct crypto_gcm_setkey_result *result = req->data;
+
+   if (err == -EINPROGRESS)
+      return;
+
+   result->err = err;
+   complete(&result->completion);
+}
+
+static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
+              unsigned int keylen)
+{
+   struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
+   struct crypto_ablkcipher *ctr = ctx->ctr;
+   struct {
+      be128 hash;
+      u8 iv[8];
+
+      struct crypto_gcm_setkey_result result;
+
+      struct scatterlist sg[1];
+      struct ablkcipher_request req;
+   } *data;
+   int err;
+
+   crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
+   crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
+               CRYPTO_TFM_REQ_MASK);
+
+   err = crypto_ablkcipher_setkey(ctr, key, keylen);
+   if (err)
+      return err;
+
+   crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
+                   CRYPTO_TFM_RES_MASK);
+
+   data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
+             GFP_KERNEL);
+   if (!data)
+      return -ENOMEM;
+
+   init_completion(&data->result.completion);
+   sg_init_one(data->sg, &data->hash, sizeof(data->hash));
+   ablkcipher_request_set_tfm(&data->req, ctr);
+   ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
+                      CRYPTO_TFM_REQ_MAY_BACKLOG,
+               crypto_gcm_setkey_done,
+               &data->result);
+   ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
+                 sizeof(data->hash), data->iv);
+
+   err = crypto_ablkcipher_encrypt(&data->req);
+   if (err == -EINPROGRESS || err == -EBUSY) {
+      err = wait_for_completion_interruptible(
+         &data->result.completion);
+      if (!err)
+         err = data->result.err;
+   }
+
+   if (err)
+      goto out;
+
+   if (ctx->gf128 != NULL)
+      gf128mul_free_4k(ctx->gf128);
+
+   ctx->gf128 = gf128mul_init_4k_lle(&data->hash);
+
+   if (ctx->gf128 == NULL)
+      err = -ENOMEM;
+
+out:
+   kfree(data);
+   return err;
+}
+
+static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
+              unsigned int authsize)
+{
+   switch (authsize) {
+   case 4:
+   case 8:
+   case 12:
+   case 13:
+   case 14:
+   case 15:
+   case 16:
+      break;
+   default:
+      return -EINVAL;
+   }
+
+   return 0;
+}
+
+static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
+              struct aead_request *req,
+              unsigned int cryptlen)
+{
+   struct crypto_aead *aead = crypto_aead_reqtfm(req);
+   struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
+   struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+   u32 flags = req->base.tfm->crt_flags;
+   struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
+   struct scatterlist *dst;
+   __be32 counter = cpu_to_be32(1);
+
+   memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
+   memcpy(req->iv + 12, &counter, 4);
+
+   sg_init_table(pctx->src, 2);
+   sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
+   scatterwalk_sg_chain(pctx->src, 2, req->src);
+
+   dst = pctx->src;
+   if (req->src != req->dst) {
+      sg_init_table(pctx->dst, 2);
+      sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
+      scatterwalk_sg_chain(pctx->dst, 2, req->dst);
+      dst = pctx->dst;
+   }
+
+   ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
+   ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
+                 cryptlen + sizeof(pctx->auth_tag),
+                 req->iv);
+
+   crypto_gcm_ghash_init(ghash, flags, ctx->gf128);
+
+   crypto_gcm_ghash_update_sg(ghash, req->assoc, req->assoclen);
+   crypto_gcm_ghash_flush(ghash);
+}
+
+static int crypto_gcm_hash(struct aead_request *req)
+{
+   struct crypto_aead *aead = crypto_aead_reqtfm(req);
+   struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+   u8 *auth_tag = pctx->auth_tag;
+   struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
+
+   crypto_gcm_ghash_update_sg(ghash, req->dst, req->cryptlen);
+   crypto_gcm_ghash_final_xor(ghash, req->assoclen, req->cryptlen,
+               auth_tag);
+
+   scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
+             crypto_aead_authsize(aead), 1);
+   return 0;
+}
+
+static void crypto_gcm_encrypt_done(struct crypto_async_request *areq, int err)
+{
+   struct aead_request *req = areq->data;
+
+   if (!err)
+      err = crypto_gcm_hash(req);
+
+   aead_request_complete(req, err);
+}
+
+static int crypto_gcm_encrypt(struct aead_request *req)
+{
+   struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+   struct ablkcipher_request *abreq = &pctx->abreq;
+   int err;
+
+   crypto_gcm_init_crypt(abreq, req, req->cryptlen);
+   ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+               crypto_gcm_encrypt_done, req);
+
+   err = crypto_ablkcipher_encrypt(abreq);
+   if (err)
+      return err;
+
+   return crypto_gcm_hash(req);
+}
+
+static int crypto_gcm_verify(struct aead_request *req)
+{
+   struct crypto_aead *aead = crypto_aead_reqtfm(req);
+   struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+   struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
+   u8 *auth_tag = pctx->auth_tag;
+   u8 *iauth_tag = pctx->iauth_tag;
+   unsigned int authsize = crypto_aead_authsize(aead);
+   unsigned int cryptlen = req->cryptlen - authsize;
+
+   crypto_gcm_ghash_final_xor(ghash, req->assoclen, cryptlen, auth_tag);
+
+   authsize = crypto_aead_authsize(aead);
+   scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
+   return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
+}
+
+static void crypto_gcm_decrypt_done(struct crypto_async_request *areq, int err)
+{
+   struct aead_request *req = areq->data;
+
+   if (!err)
+      err = crypto_gcm_verify(req);
+
+   aead_request_complete(req, err);
+}
+
+static int crypto_gcm_decrypt(struct aead_request *req)
+{
+   struct crypto_aead *aead = crypto_aead_reqtfm(req);
+   struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+   struct ablkcipher_request *abreq = &pctx->abreq;
+   struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
+   unsigned int cryptlen = req->cryptlen;
+   unsigned int authsize = crypto_aead_authsize(aead);
+   int err;
+
+   if (cryptlen < authsize)
+      return -EINVAL;
+   cryptlen -= authsize;
+
+   crypto_gcm_init_crypt(abreq, req, cryptlen);
+   ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+               crypto_gcm_decrypt_done, req);
+
+   crypto_gcm_ghash_update_sg(ghash, req->src, cryptlen);
+
+   err = crypto_ablkcipher_decrypt(abreq);
+   if (err)
+      return err;
+
+   return crypto_gcm_verify(req);
+}
+
+static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
+{
+   struct crypto_instance *inst = (void *)tfm->__crt_alg;
+   struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
+   struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
+   struct crypto_ablkcipher *ctr;
+   unsigned long align;
+   int err;
+
+   ctr = crypto_spawn_skcipher(&ictx->ctr);
+   err = PTR_ERR(ctr);
+   if (IS_ERR(ctr))
+      return err;
+
+   ctx->ctr = ctr;
+   ctx->gf128 = NULL;
+
+   align = crypto_tfm_alg_alignmask(tfm);
+   align &= ~(crypto_tfm_ctx_alignment() - 1);
+   tfm->crt_aead.reqsize = align +
+            sizeof(struct crypto_gcm_req_priv_ctx) +
+            crypto_ablkcipher_reqsize(ctr);
+
+   return 0;
+}
+
+static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
+{
+   struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
+
+   if (ctx->gf128 != NULL)
+      gf128mul_free_4k(ctx->gf128);
+
+   crypto_free_ablkcipher(ctx->ctr);
+}
+
+static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
+                         const char *full_name,
+                         const char *ctr_name)
+{
+   struct crypto_attr_type *algt;
+   struct crypto_instance *inst;
+   struct crypto_alg *ctr;
+   struct gcm_instance_ctx *ctx;
+   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_AEAD) & algt->mask)
+      return ERR_PTR(-EINVAL);
+
+   inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+   if (!inst)
+      return ERR_PTR(-ENOMEM);
+
+   ctx = crypto_instance_ctx(inst);
+   crypto_set_skcipher_spawn(&ctx->ctr, inst);
+   err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
+               crypto_requires_sync(algt->type,
+                     algt->mask));
+   if (err)
+      goto err_free_inst;
+
+   ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
+
+   /* We only support 16-byte blocks. */
+   if (ctr->cra_ablkcipher.ivsize != 16)
+      goto out_put_ctr;
+
+   /* Not a stream cipher? */
+   err = -EINVAL;
+   if (ctr->cra_blocksize != 1)
+      goto out_put_ctr;
+
+   err = -ENAMETOOLONG;
+   if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+           "gcm_base(%s)", ctr->cra_driver_name) >=
+       CRYPTO_MAX_ALG_NAME)
+      goto out_put_ctr;
+
+   memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
+
+   inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+   inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
+   inst->alg.cra_priority = ctr->cra_priority;
+   inst->alg.cra_blocksize = 1;
+   inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
+   inst->alg.cra_type = &crypto_aead_type;
+   inst->alg.cra_aead.ivsize = 16;
+   inst->alg.cra_aead.maxauthsize = 16;
+   inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
+   inst->alg.cra_init = crypto_gcm_init_tfm;
+   inst->alg.cra_exit = crypto_gcm_exit_tfm;
+   inst->alg.cra_aead.setkey = crypto_gcm_setkey;
+   inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
+   inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
+   inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
+
+out:
+   return inst;
+
+out_put_ctr:
+   crypto_drop_skcipher(&ctx->ctr);
+err_free_inst:
+   kfree(inst);
+   inst = ERR_PTR(err);
+   goto out;
+}
+
+static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
+{
+   int err;
+   const char *cipher_name;
+   char ctr_name[CRYPTO_MAX_ALG_NAME];
+   char full_name[CRYPTO_MAX_ALG_NAME];
+
+   cipher_name = crypto_attr_alg_name(tb[1]);
+   err = PTR_ERR(cipher_name);
+   if (IS_ERR(cipher_name))
+      return ERR_PTR(err);
+
+   if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
+       CRYPTO_MAX_ALG_NAME)
+      return ERR_PTR(-ENAMETOOLONG);
+
+   if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
+       CRYPTO_MAX_ALG_NAME)
+      return ERR_PTR(-ENAMETOOLONG);
+
+   return crypto_gcm_alloc_common(tb, full_name, ctr_name);
+}
+
+static void crypto_gcm_free(struct crypto_instance *inst)
+{
+   struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
+
+   crypto_drop_skcipher(&ctx->ctr);
+   kfree(inst);
+}
+
+static struct crypto_template crypto_gcm_tmpl = {
+   .name = "gcm",
+   .alloc = crypto_gcm_alloc,
+   .free = crypto_gcm_free,
+   .module = THIS_MODULE,
+};
+
+static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
+{
+   int err;
+   const char *ctr_name;
+   char full_name[CRYPTO_MAX_ALG_NAME];
+
+   ctr_name = crypto_attr_alg_name(tb[1]);
+   err = PTR_ERR(ctr_name);
+   if (IS_ERR(ctr_name))
+      return ERR_PTR(err);
+
+   if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s)",
+           ctr_name) >= CRYPTO_MAX_ALG_NAME)
+      return ERR_PTR(-ENAMETOOLONG);
+
+   return crypto_gcm_alloc_common(tb, full_name, ctr_name);
+}
+
+static struct crypto_template crypto_gcm_base_tmpl = {
+   .name = "gcm_base",
+   .alloc = crypto_gcm_base_alloc,
+   .free = crypto_gcm_free,
+   .module = THIS_MODULE,
+};
+
+static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
+             unsigned int keylen)
+{
+   struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
+   struct crypto_aead *child = ctx->child;
+   int err;
+
+   if (keylen < 4)
+      return -EINVAL;
+
+   keylen -= 4;
+   memcpy(ctx->nonce, key + keylen, 4);
+
+   crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+   crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
+                 CRYPTO_TFM_REQ_MASK);
+   err = crypto_aead_setkey(child, key, keylen);
+   crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
+                  CRYPTO_TFM_RES_MASK);
+
+   return err;
+}
+
+static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
+                  unsigned int authsize)
+{
+   struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
+
+   switch (authsize) {
+   case 8:
+   case 12:
+   case 16:
+      break;
+   default:
+      return -EINVAL;
+   }
+
+   return crypto_aead_setauthsize(ctx->child, authsize);
+}
+
+static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
+{
+   struct aead_request *subreq = aead_request_ctx(req);
+   struct crypto_aead *aead = crypto_aead_reqtfm(req);
+   struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
+   struct crypto_aead *child = ctx->child;
+   u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
+            crypto_aead_alignmask(child) + 1);
+
+   memcpy(iv, ctx->nonce, 4);
+   memcpy(iv + 4, req->iv, 8);
+
+   aead_request_set_tfm(subreq, child);
+   aead_request_set_callback(subreq, req->base.flags, req->base.complete,
+              req->base.data);
+   aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
+   aead_request_set_assoc(subreq, req->assoc, req->assoclen);
+
+   return subreq;
+}
+
+static int crypto_rfc4106_encrypt(struct aead_request *req)
+{
+   req = crypto_rfc4106_crypt(req);
+
+   return crypto_aead_encrypt(req);
+}
+
+static int crypto_rfc4106_decrypt(struct aead_request *req)
+{
+   req = crypto_rfc4106_crypt(req);
+
+   return crypto_aead_decrypt(req);
+}
+
+static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
+{
+   struct crypto_instance *inst = (void *)tfm->__crt_alg;
+   struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
+   struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
+   struct crypto_aead *aead;
+   unsigned long align;
+
+   aead = crypto_spawn_aead(spawn);
+   if (IS_ERR(aead))
+      return PTR_ERR(aead);
+
+   ctx->child = aead;
+
+   align = crypto_aead_alignmask(aead);
+   align &= ~(crypto_tfm_ctx_alignment() - 1);
+   tfm->crt_aead.reqsize = sizeof(struct aead_request) +
+            ALIGN(crypto_aead_reqsize(aead),
+                  crypto_tfm_ctx_alignment()) +
+            align + 16;
+
+   return 0;
+}
+
+static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
+{
+   struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
+
+   crypto_free_aead(ctx->child);
+}
+
+static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
+{
+   struct crypto_attr_type *algt;
+   struct crypto_instance *inst;
+   struct crypto_aead_spawn *spawn;
+   struct crypto_alg *alg;
+   const char *ccm_name;
+   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_AEAD) & algt->mask)
+      return ERR_PTR(-EINVAL);
+
+   ccm_name = crypto_attr_alg_name(tb[1]);
+   err = PTR_ERR(ccm_name);
+   if (IS_ERR(ccm_name))
+      return ERR_PTR(err);
+
+   inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+   if (!inst)
+      return ERR_PTR(-ENOMEM);
+
+   spawn = crypto_instance_ctx(inst);
+   crypto_set_aead_spawn(spawn, inst);
+   err = crypto_grab_aead(spawn, ccm_name, 0,
+                crypto_requires_sync(algt->type, algt->mask));
+   if (err)
+      goto out_free_inst;
+
+   alg = crypto_aead_spawn_alg(spawn);
+
+   err = -EINVAL;
+
+   /* We only support 16-byte blocks. */
+   if (alg->cra_aead.ivsize != 16)
+      goto out_drop_alg;
+
+   /* Not a stream cipher? */
+   if (alg->cra_blocksize != 1)
+      goto out_drop_alg;
+
+   err = -ENAMETOOLONG;
+   if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+           "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
+       snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+           "rfc4106(%s)", alg->cra_driver_name) >=
+       CRYPTO_MAX_ALG_NAME)
+      goto out_drop_alg;
+
+   inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+   inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
+   inst->alg.cra_priority = alg->cra_priority;
+   inst->alg.cra_blocksize = 1;
+   inst->alg.cra_alignmask = alg->cra_alignmask;
+   inst->alg.cra_type = &crypto_nivaead_type;
+
+   inst->alg.cra_aead.ivsize = 8;
+   inst->alg.cra_aead.maxauthsize = 16;
+
+   inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
+
+   inst->alg.cra_init = crypto_rfc4106_init_tfm;
+   inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
+
+   inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
+   inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
+   inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
+   inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
+
+   inst->alg.cra_aead.geniv = "seqiv";
+
+out:
+   return inst;
+
+out_drop_alg:
+   crypto_drop_aead(spawn);
+out_free_inst:
+   kfree(inst);
+   inst = ERR_PTR(err);
+   goto out;
+}
+
+static void crypto_rfc4106_free(struct crypto_instance *inst)
+{
+   crypto_drop_spawn(crypto_instance_ctx(inst));
+   kfree(inst);
+}
+
+static struct crypto_template crypto_rfc4106_tmpl = {
+   .name = "rfc4106",
+   .alloc = crypto_rfc4106_alloc,
+   .free = crypto_rfc4106_free,
+   .module = THIS_MODULE,
+};
+
+static int __init crypto_gcm_module_init(void)
+{
+   int err;
+
+   err = crypto_register_template(&crypto_gcm_base_tmpl);
+   if (err)
+      goto out;
+
+   err = crypto_register_template(&crypto_gcm_tmpl);
+   if (err)
+      goto out_undo_base;
+
+   err = crypto_register_template(&crypto_rfc4106_tmpl);
+   if (err)
+      goto out_undo_gcm;
+
+out:
+   return err;
+
+out_undo_gcm:
+   crypto_unregister_template(&crypto_gcm_tmpl);
+out_undo_base:
+   crypto_unregister_template(&crypto_gcm_base_tmpl);
+   goto out;
+}
+
+static void __exit crypto_gcm_module_exit(void)
+{
+   crypto_unregister_template(&crypto_rfc4106_tmpl);
+   crypto_unregister_template(&crypto_gcm_tmpl);
+   crypto_unregister_template(&crypto_gcm_base_tmpl);
+}
+
+module_init(crypto_gcm_module_init);
+module_exit(crypto_gcm_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Galois/Counter Mode");
+MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
+MODULE_ALIAS("gcm_base");
+MODULE_ALIAS("rfc4106");