Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 958 insertions, 0 deletions

diff --git a/crypto/ccm.c b/crypto/ccm.c
new file mode 100644
index 000000000..6b815ece5
--- /dev/null
+++ b/crypto/ccm.c
@@ -0,0 +1,958 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * CCM: Counter with CBC-MAC
+ *
+ * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
+ */
+
+#include <crypto/internal/aead.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+struct ccm_instance_ctx {
+	struct crypto_skcipher_spawn ctr;
+	struct crypto_ahash_spawn mac;
+};
+
+struct crypto_ccm_ctx {
+	struct crypto_ahash *mac;
+	struct crypto_skcipher *ctr;
+};
+
+struct crypto_rfc4309_ctx {
+	struct crypto_aead *child;
+	u8 nonce[3];
+};
+
+struct crypto_rfc4309_req_ctx {
+	struct scatterlist src[3];
+	struct scatterlist dst[3];
+	struct aead_request subreq;
+};
+
+struct crypto_ccm_req_priv_ctx {
+	u8 odata[16];
+	u8 idata[16];
+	u8 auth_tag[16];
+	u32 flags;
+	struct scatterlist src[3];
+	struct scatterlist dst[3];
+	union {
+		struct ahash_request ahreq;
+		struct skcipher_request skreq;
+	};
+};
+
+struct cbcmac_tfm_ctx {
+	struct crypto_cipher *child;
+};
+
+struct cbcmac_desc_ctx {
+	unsigned int len;
+};
+
+static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_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 int set_msg_len(u8 *block, unsigned int msglen, int csize)
+{
+	__be32 data;
+
+	memset(block, 0, csize);
+	block += csize;
+
+	if (csize >= 4)
+		csize = 4;
+	else if (msglen > (1 << (8 * csize)))
+		return -EOVERFLOW;
+
+	data = cpu_to_be32(msglen);
+	memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
+
+	return 0;
+}
+
+static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
+			     unsigned int keylen)
+{
+	struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+	struct crypto_skcipher *ctr = ctx->ctr;
+	struct crypto_ahash *mac = ctx->mac;
+	int err;
+
+	crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
+				       CRYPTO_TFM_REQ_MASK);
+	err = crypto_skcipher_setkey(ctr, key, keylen);
+	if (err)
+		return err;
+
+	crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
+	crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
+				    CRYPTO_TFM_REQ_MASK);
+	return crypto_ahash_setkey(mac, key, keylen);
+}
+
+static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
+				  unsigned int authsize)
+{
+	switch (authsize) {
+	case 4:
+	case 6:
+	case 8:
+	case 10:
+	case 12:
+	case 14:
+	case 16:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int format_input(u8 *info, struct aead_request *req,
+			unsigned int cryptlen)
+{
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	unsigned int lp = req->iv[0];
+	unsigned int l = lp + 1;
+	unsigned int m;
+
+	m = crypto_aead_authsize(aead);
+
+	memcpy(info, req->iv, 16);
+
+	/* format control info per RFC 3610 and
+	 * NIST Special Publication 800-38C
+	 */
+	*info |= (8 * ((m - 2) / 2));
+	if (req->assoclen)
+		*info |= 64;
+
+	return set_msg_len(info + 16 - l, cryptlen, l);
+}
+
+static int format_adata(u8 *adata, unsigned int a)
+{
+	int len = 0;
+
+	/* add control info for associated data
+	 * RFC 3610 and NIST Special Publication 800-38C
+	 */
+	if (a < 65280) {
+		*(__be16 *)adata = cpu_to_be16(a);
+		len = 2;
+	} else  {
+		*(__be16 *)adata = cpu_to_be16(0xfffe);
+		*(__be32 *)&adata[2] = cpu_to_be32(a);
+		len = 6;
+	}
+
+	return len;
+}
+
+static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
+			   unsigned int cryptlen)
+{
+	struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+	struct ahash_request *ahreq = &pctx->ahreq;
+	unsigned int assoclen = req->assoclen;
+	struct scatterlist sg[3];
+	u8 *odata = pctx->odata;
+	u8 *idata = pctx->idata;
+	int ilen, err;
+
+	/* format control data for input */
+	err = format_input(odata, req, cryptlen);
+	if (err)
+		goto out;
+
+	sg_init_table(sg, 3);
+	sg_set_buf(&sg[0], odata, 16);
+
+	/* format associated data and compute into mac */
+	if (assoclen) {
+		ilen = format_adata(idata, assoclen);
+		sg_set_buf(&sg[1], idata, ilen);
+		sg_chain(sg, 3, req->src);
+	} else {
+		ilen = 0;
+		sg_chain(sg, 2, req->src);
+	}
+
+	ahash_request_set_tfm(ahreq, ctx->mac);
+	ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
+	ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
+	err = crypto_ahash_init(ahreq);
+	if (err)
+		goto out;
+	err = crypto_ahash_update(ahreq);
+	if (err)
+		goto out;
+
+	/* we need to pad the MAC input to a round multiple of the block size */
+	ilen = 16 - (assoclen + ilen) % 16;
+	if (ilen < 16) {
+		memset(idata, 0, ilen);
+		sg_init_table(sg, 2);
+		sg_set_buf(&sg[0], idata, ilen);
+		if (plain)
+			sg_chain(sg, 2, plain);
+		plain = sg;
+		cryptlen += ilen;
+	}
+
+	ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
+	err = crypto_ahash_finup(ahreq);
+out:
+	return err;
+}
+
+static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
+{
+	struct aead_request *req = areq->data;
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+	u8 *odata = pctx->odata;
+
+	if (!err)
+		scatterwalk_map_and_copy(odata, req->dst,
+					 req->assoclen + req->cryptlen,
+					 crypto_aead_authsize(aead), 1);
+	aead_request_complete(req, err);
+}
+
+static inline int crypto_ccm_check_iv(const u8 *iv)
+{
+	/* 2 <= L <= 8, so 1 <= L' <= 7. */
+	if (1 > iv[0] || iv[0] > 7)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
+{
+	struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+	struct scatterlist *sg;
+	u8 *iv = req->iv;
+	int err;
+
+	err = crypto_ccm_check_iv(iv);
+	if (err)
+		return err;
+
+	pctx->flags = aead_request_flags(req);
+
+	 /* Note: rfc 3610 and NIST 800-38C require counter of
+	 * zero to encrypt auth tag.
+	 */
+	memset(iv + 15 - iv[0], 0, iv[0] + 1);
+
+	sg_init_table(pctx->src, 3);
+	sg_set_buf(pctx->src, tag, 16);
+	sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
+	if (sg != pctx->src + 1)
+		sg_chain(pctx->src, 2, sg);
+
+	if (req->src != req->dst) {
+		sg_init_table(pctx->dst, 3);
+		sg_set_buf(pctx->dst, tag, 16);
+		sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
+		if (sg != pctx->dst + 1)
+			sg_chain(pctx->dst, 2, sg);
+	}
+
+	return 0;
+}
+
+static int crypto_ccm_encrypt(struct aead_request *req)
+{
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+	struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+	struct skcipher_request *skreq = &pctx->skreq;
+	struct scatterlist *dst;
+	unsigned int cryptlen = req->cryptlen;
+	u8 *odata = pctx->odata;
+	u8 *iv = req->iv;
+	int err;
+
+	err = crypto_ccm_init_crypt(req, odata);
+	if (err)
+		return err;
+
+	err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
+	if (err)
+		return err;
+
+	dst = pctx->src;
+	if (req->src != req->dst)
+		dst = pctx->dst;
+
+	skcipher_request_set_tfm(skreq, ctx->ctr);
+	skcipher_request_set_callback(skreq, pctx->flags,
+				      crypto_ccm_encrypt_done, req);
+	skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
+	err = crypto_skcipher_encrypt(skreq);
+	if (err)
+		return err;
+
+	/* copy authtag to end of dst */
+	scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
+				 crypto_aead_authsize(aead), 1);
+	return err;
+}
+
+static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
+				   int err)
+{
+	struct aead_request *req = areq->data;
+	struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	unsigned int authsize = crypto_aead_authsize(aead);
+	unsigned int cryptlen = req->cryptlen - authsize;
+	struct scatterlist *dst;
+
+	pctx->flags = 0;
+
+	dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
+
+	if (!err) {
+		err = crypto_ccm_auth(req, dst, cryptlen);
+		if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
+			err = -EBADMSG;
+	}
+	aead_request_complete(req, err);
+}
+
+static int crypto_ccm_decrypt(struct aead_request *req)
+{
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
+	struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
+	struct skcipher_request *skreq = &pctx->skreq;
+	struct scatterlist *dst;
+	unsigned int authsize = crypto_aead_authsize(aead);
+	unsigned int cryptlen = req->cryptlen;
+	u8 *authtag = pctx->auth_tag;
+	u8 *odata = pctx->odata;
+	u8 *iv = pctx->idata;
+	int err;
+
+	cryptlen -= authsize;
+
+	err = crypto_ccm_init_crypt(req, authtag);
+	if (err)
+		return err;
+
+	scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
+				 authsize, 0);
+
+	dst = pctx->src;
+	if (req->src != req->dst)
+		dst = pctx->dst;
+
+	memcpy(iv, req->iv, 16);
+
+	skcipher_request_set_tfm(skreq, ctx->ctr);
+	skcipher_request_set_callback(skreq, pctx->flags,
+				      crypto_ccm_decrypt_done, req);
+	skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
+	err = crypto_skcipher_decrypt(skreq);
+	if (err)
+		return err;
+
+	err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
+	if (err)
+		return err;
+
+	/* verify */
+	if (crypto_memneq(authtag, odata, authsize))
+		return -EBADMSG;
+
+	return err;
+}
+
+static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
+{
+	struct aead_instance *inst = aead_alg_instance(tfm);
+	struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
+	struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
+	struct crypto_ahash *mac;
+	struct crypto_skcipher *ctr;
+	unsigned long align;
+	int err;
+
+	mac = crypto_spawn_ahash(&ictx->mac);
+	if (IS_ERR(mac))
+		return PTR_ERR(mac);
+
+	ctr = crypto_spawn_skcipher(&ictx->ctr);
+	err = PTR_ERR(ctr);
+	if (IS_ERR(ctr))
+		goto err_free_mac;
+
+	ctx->mac = mac;
+	ctx->ctr = ctr;
+
+	align = crypto_aead_alignmask(tfm);
+	align &= ~(crypto_tfm_ctx_alignment() - 1);
+	crypto_aead_set_reqsize(
+		tfm,
+		align + sizeof(struct crypto_ccm_req_priv_ctx) +
+		max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr)));
+
+	return 0;
+
+err_free_mac:
+	crypto_free_ahash(mac);
+	return err;
+}
+
+static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
+{
+	struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
+
+	crypto_free_ahash(ctx->mac);
+	crypto_free_skcipher(ctx->ctr);
+}
+
+static void crypto_ccm_free(struct aead_instance *inst)
+{
+	struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
+
+	crypto_drop_ahash(&ctx->mac);
+	crypto_drop_skcipher(&ctx->ctr);
+	kfree(inst);
+}
+
+static int crypto_ccm_create_common(struct crypto_template *tmpl,
+				    struct rtattr **tb,
+				    const char *ctr_name,
+				    const char *mac_name)
+{
+	u32 mask;
+	struct aead_instance *inst;
+	struct ccm_instance_ctx *ictx;
+	struct skcipher_alg *ctr;
+	struct hash_alg_common *mac;
+	int err;
+
+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
+	if (err)
+		return err;
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+	ictx = aead_instance_ctx(inst);
+
+	err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst),
+				mac_name, 0, mask | CRYPTO_ALG_ASYNC);
+	if (err)
+		goto err_free_inst;
+	mac = crypto_spawn_ahash_alg(&ictx->mac);
+
+	err = -EINVAL;
+	if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
+	    mac->digestsize != 16)
+		goto err_free_inst;
+
+	err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst),
+				   ctr_name, 0, mask);
+	if (err)
+		goto err_free_inst;
+	ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
+
+	/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
+	err = -EINVAL;
+	if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
+	    crypto_skcipher_alg_ivsize(ctr) != 16 ||
+	    ctr->base.cra_blocksize != 1)
+		goto err_free_inst;
+
+	/* ctr and cbcmac must use the same underlying block cipher. */
+	if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
+		goto err_free_inst;
+
+	err = -ENAMETOOLONG;
+	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
+		     "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
+		goto err_free_inst;
+
+	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+		     "ccm_base(%s,%s)", ctr->base.cra_driver_name,
+		     mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+		goto err_free_inst;
+
+	inst->alg.base.cra_priority = (mac->base.cra_priority +
+				       ctr->base.cra_priority) / 2;
+	inst->alg.base.cra_blocksize = 1;
+	inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
+				       ctr->base.cra_alignmask;
+	inst->alg.ivsize = 16;
+	inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
+	inst->alg.maxauthsize = 16;
+	inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
+	inst->alg.init = crypto_ccm_init_tfm;
+	inst->alg.exit = crypto_ccm_exit_tfm;
+	inst->alg.setkey = crypto_ccm_setkey;
+	inst->alg.setauthsize = crypto_ccm_setauthsize;
+	inst->alg.encrypt = crypto_ccm_encrypt;
+	inst->alg.decrypt = crypto_ccm_decrypt;
+
+	inst->free = crypto_ccm_free;
+
+	err = aead_register_instance(tmpl, inst);
+	if (err) {
+err_free_inst:
+		crypto_ccm_free(inst);
+	}
+	return err;
+}
+
+static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	const char *cipher_name;
+	char ctr_name[CRYPTO_MAX_ALG_NAME];
+	char mac_name[CRYPTO_MAX_ALG_NAME];
+
+	cipher_name = crypto_attr_alg_name(tb[1]);
+	if (IS_ERR(cipher_name))
+		return PTR_ERR(cipher_name);
+
+	if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
+		     cipher_name) >= CRYPTO_MAX_ALG_NAME)
+		return -ENAMETOOLONG;
+
+	if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
+		     cipher_name) >= CRYPTO_MAX_ALG_NAME)
+		return -ENAMETOOLONG;
+
+	return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
+}
+
+static int crypto_ccm_base_create(struct crypto_template *tmpl,
+				  struct rtattr **tb)
+{
+	const char *ctr_name;
+	const char *mac_name;
+
+	ctr_name = crypto_attr_alg_name(tb[1]);
+	if (IS_ERR(ctr_name))
+		return PTR_ERR(ctr_name);
+
+	mac_name = crypto_attr_alg_name(tb[2]);
+	if (IS_ERR(mac_name))
+		return PTR_ERR(mac_name);
+
+	return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
+}
+
+static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
+				 unsigned int keylen)
+{
+	struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
+	struct crypto_aead *child = ctx->child;
+
+	if (keylen < 3)
+		return -EINVAL;
+
+	keylen -= 3;
+	memcpy(ctx->nonce, key + keylen, 3);
+
+	crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+	crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
+				     CRYPTO_TFM_REQ_MASK);
+	return crypto_aead_setkey(child, key, keylen);
+}
+
+static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
+				      unsigned int authsize)
+{
+	struct crypto_rfc4309_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_rfc4309_crypt(struct aead_request *req)
+{
+	struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
+	struct aead_request *subreq = &rctx->subreq;
+	struct crypto_aead *aead = crypto_aead_reqtfm(req);
+	struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
+	struct crypto_aead *child = ctx->child;
+	struct scatterlist *sg;
+	u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
+			   crypto_aead_alignmask(child) + 1);
+
+	/* L' */
+	iv[0] = 3;
+
+	memcpy(iv + 1, ctx->nonce, 3);
+	memcpy(iv + 4, req->iv, 8);
+
+	scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
+
+	sg_init_table(rctx->src, 3);
+	sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
+	sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
+	if (sg != rctx->src + 1)
+		sg_chain(rctx->src, 2, sg);
+
+	if (req->src != req->dst) {
+		sg_init_table(rctx->dst, 3);
+		sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
+		sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
+		if (sg != rctx->dst + 1)
+			sg_chain(rctx->dst, 2, sg);
+	}
+
+	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, rctx->src,
+			       req->src == req->dst ? rctx->src : rctx->dst,
+			       req->cryptlen, iv);
+	aead_request_set_ad(subreq, req->assoclen - 8);
+
+	return subreq;
+}
+
+static int crypto_rfc4309_encrypt(struct aead_request *req)
+{
+	if (req->assoclen != 16 && req->assoclen != 20)
+		return -EINVAL;
+
+	req = crypto_rfc4309_crypt(req);
+
+	return crypto_aead_encrypt(req);
+}
+
+static int crypto_rfc4309_decrypt(struct aead_request *req)
+{
+	if (req->assoclen != 16 && req->assoclen != 20)
+		return -EINVAL;
+
+	req = crypto_rfc4309_crypt(req);
+
+	return crypto_aead_decrypt(req);
+}
+
+static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
+{
+	struct aead_instance *inst = aead_alg_instance(tfm);
+	struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
+	struct crypto_rfc4309_ctx *ctx = crypto_aead_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);
+	crypto_aead_set_reqsize(
+		tfm,
+		sizeof(struct crypto_rfc4309_req_ctx) +
+		ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
+		align + 32);
+
+	return 0;
+}
+
+static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
+{
+	struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
+
+	crypto_free_aead(ctx->child);
+}
+
+static void crypto_rfc4309_free(struct aead_instance *inst)
+{
+	crypto_drop_aead(aead_instance_ctx(inst));
+	kfree(inst);
+}
+
+static int crypto_rfc4309_create(struct crypto_template *tmpl,
+				 struct rtattr **tb)
+{
+	u32 mask;
+	struct aead_instance *inst;
+	struct crypto_aead_spawn *spawn;
+	struct aead_alg *alg;
+	int err;
+
+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
+	if (err)
+		return err;
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+
+	spawn = aead_instance_ctx(inst);
+	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
+			       crypto_attr_alg_name(tb[1]), 0, mask);
+	if (err)
+		goto err_free_inst;
+
+	alg = crypto_spawn_aead_alg(spawn);
+
+	err = -EINVAL;
+
+	/* We only support 16-byte blocks. */
+	if (crypto_aead_alg_ivsize(alg) != 16)
+		goto err_free_inst;
+
+	/* Not a stream cipher? */
+	if (alg->base.cra_blocksize != 1)
+		goto err_free_inst;
+
+	err = -ENAMETOOLONG;
+	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
+		     "rfc4309(%s)", alg->base.cra_name) >=
+	    CRYPTO_MAX_ALG_NAME ||
+	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+		     "rfc4309(%s)", alg->base.cra_driver_name) >=
+	    CRYPTO_MAX_ALG_NAME)
+		goto err_free_inst;
+
+	inst->alg.base.cra_priority = alg->base.cra_priority;
+	inst->alg.base.cra_blocksize = 1;
+	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
+
+	inst->alg.ivsize = 8;
+	inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
+	inst->alg.maxauthsize = 16;
+
+	inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
+
+	inst->alg.init = crypto_rfc4309_init_tfm;
+	inst->alg.exit = crypto_rfc4309_exit_tfm;
+
+	inst->alg.setkey = crypto_rfc4309_setkey;
+	inst->alg.setauthsize = crypto_rfc4309_setauthsize;
+	inst->alg.encrypt = crypto_rfc4309_encrypt;
+	inst->alg.decrypt = crypto_rfc4309_decrypt;
+
+	inst->free = crypto_rfc4309_free;
+
+	err = aead_register_instance(tmpl, inst);
+	if (err) {
+err_free_inst:
+		crypto_rfc4309_free(inst);
+	}
+	return err;
+}
+
+static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
+				     const u8 *inkey, unsigned int keylen)
+{
+	struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
+
+	return crypto_cipher_setkey(ctx->child, inkey, keylen);
+}
+
+static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
+{
+	struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
+	int bs = crypto_shash_digestsize(pdesc->tfm);
+	u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
+
+	ctx->len = 0;
+	memset(dg, 0, bs);
+
+	return 0;
+}
+
+static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
+				       unsigned int len)
+{
+	struct crypto_shash *parent = pdesc->tfm;
+	struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
+	struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
+	struct crypto_cipher *tfm = tctx->child;
+	int bs = crypto_shash_digestsize(parent);
+	u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
+
+	while (len > 0) {
+		unsigned int l = min(len, bs - ctx->len);
+
+		crypto_xor(dg + ctx->len, p, l);
+		ctx->len +=l;
+		len -= l;
+		p += l;
+
+		if (ctx->len == bs) {
+			crypto_cipher_encrypt_one(tfm, dg, dg);
+			ctx->len = 0;
+		}
+	}
+
+	return 0;
+}
+
+static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
+{
+	struct crypto_shash *parent = pdesc->tfm;
+	struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
+	struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
+	struct crypto_cipher *tfm = tctx->child;
+	int bs = crypto_shash_digestsize(parent);
+	u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
+
+	if (ctx->len)
+		crypto_cipher_encrypt_one(tfm, dg, dg);
+
+	memcpy(out, dg, bs);
+	return 0;
+}
+
+static int cbcmac_init_tfm(struct crypto_tfm *tfm)
+{
+	struct crypto_cipher *cipher;
+	struct crypto_instance *inst = (void *)tfm->__crt_alg;
+	struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
+	struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	cipher = crypto_spawn_cipher(spawn);
+	if (IS_ERR(cipher))
+		return PTR_ERR(cipher);
+
+	ctx->child = cipher;
+
+	return 0;
+};
+
+static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
+{
+	struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
+	crypto_free_cipher(ctx->child);
+}
+
+static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	struct shash_instance *inst;
+	struct crypto_cipher_spawn *spawn;
+	struct crypto_alg *alg;
+	u32 mask;
+	int err;
+
+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
+	if (err)
+		return err;
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+	spawn = shash_instance_ctx(inst);
+
+	err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
+				 crypto_attr_alg_name(tb[1]), 0, mask);
+	if (err)
+		goto err_free_inst;
+	alg = crypto_spawn_cipher_alg(spawn);
+
+	err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
+	if (err)
+		goto err_free_inst;
+
+	inst->alg.base.cra_priority = alg->cra_priority;
+	inst->alg.base.cra_blocksize = 1;
+
+	inst->alg.digestsize = alg->cra_blocksize;
+	inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
+				   alg->cra_alignmask + 1) +
+			     alg->cra_blocksize;
+
+	inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
+	inst->alg.base.cra_init = cbcmac_init_tfm;
+	inst->alg.base.cra_exit = cbcmac_exit_tfm;
+
+	inst->alg.init = crypto_cbcmac_digest_init;
+	inst->alg.update = crypto_cbcmac_digest_update;
+	inst->alg.final = crypto_cbcmac_digest_final;
+	inst->alg.setkey = crypto_cbcmac_digest_setkey;
+
+	inst->free = shash_free_singlespawn_instance;
+
+	err = shash_register_instance(tmpl, inst);
+	if (err) {
+err_free_inst:
+		shash_free_singlespawn_instance(inst);
+	}
+	return err;
+}
+
+static struct crypto_template crypto_ccm_tmpls[] = {
+	{
+		.name = "cbcmac",
+		.create = cbcmac_create,
+		.module = THIS_MODULE,
+	}, {
+		.name = "ccm_base",
+		.create = crypto_ccm_base_create,
+		.module = THIS_MODULE,
+	}, {
+		.name = "ccm",
+		.create = crypto_ccm_create,
+		.module = THIS_MODULE,
+	}, {
+		.name = "rfc4309",
+		.create = crypto_rfc4309_create,
+		.module = THIS_MODULE,
+	},
+};
+
+static int __init crypto_ccm_module_init(void)
+{
+	return crypto_register_templates(crypto_ccm_tmpls,
+					 ARRAY_SIZE(crypto_ccm_tmpls));
+}
+
+static void __exit crypto_ccm_module_exit(void)
+{
+	crypto_unregister_templates(crypto_ccm_tmpls,
+				    ARRAY_SIZE(crypto_ccm_tmpls));
+}
+
+subsys_initcall(crypto_ccm_module_init);
+module_exit(crypto_ccm_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Counter with CBC MAC");
+MODULE_ALIAS_CRYPTO("ccm_base");
+MODULE_ALIAS_CRYPTO("rfc4309");
+MODULE_ALIAS_CRYPTO("ccm");
+MODULE_ALIAS_CRYPTO("cbcmac");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);