gcm.c 34.3 KB
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/*
 * 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>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/internal/hash.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/hash.h>
#include "internal.h"
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#include <linux/completion.h>
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#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

struct gcm_instance_ctx {
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	struct crypto_skcipher_spawn ctr;
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	struct crypto_ahash_spawn ghash;
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};

struct crypto_gcm_ctx {
	struct crypto_ablkcipher *ctr;
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	struct crypto_ahash *ghash;
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};

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struct crypto_rfc4106_ctx {
	struct crypto_aead *child;
	u8 nonce[4];
};

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struct crypto_rfc4543_ctx {
	struct crypto_aead *child;
	u8 nonce[4];
};

struct crypto_rfc4543_req_ctx {
	u8 auth_tag[16];
	struct scatterlist cipher[1];
	struct scatterlist payload[2];
	struct scatterlist assoc[2];
	struct aead_request subreq;
};

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struct crypto_gcm_ghash_ctx {
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	unsigned int cryptlen;
	struct scatterlist *src;
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	void (*complete)(struct aead_request *req, int err);
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};

struct crypto_gcm_req_priv_ctx {
	u8 auth_tag[16];
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	u8 iauth_tag[16];
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	struct scatterlist src[2];
	struct scatterlist dst[2];
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	struct crypto_gcm_ghash_ctx ghash_ctx;
	union {
		struct ahash_request ahreq;
		struct ablkcipher_request abreq;
	} u;
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};

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struct crypto_gcm_setkey_result {
	int err;
	struct completion completion;
};

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static void *gcm_zeroes;

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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);
}

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static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
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{
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	struct crypto_gcm_setkey_result *result = req->data;
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	if (err == -EINPROGRESS)
		return;

	result->err = err;
	complete(&result->completion);
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}

static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
			     unsigned int keylen)
{
	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
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	struct crypto_ahash *ghash = ctx->ghash;
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	struct crypto_ablkcipher *ctr = ctx->ctr;
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	struct {
		be128 hash;
		u8 iv[8];

		struct crypto_gcm_setkey_result result;

		struct scatterlist sg[1];
		struct ablkcipher_request req;
	} *data;
	int err;
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	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)
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		return err;
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	crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
				       CRYPTO_TFM_RES_MASK);

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	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;
	}

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	if (err)
		goto out;

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	crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
	crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
			       CRYPTO_TFM_REQ_MASK);
	err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
	crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
			      CRYPTO_TFM_RES_MASK);
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out:
	kfree(data);
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	return err;
}

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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;
}

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static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
				  struct aead_request *req,
				  unsigned int cryptlen)
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{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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	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;
	}
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	ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
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	ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
				     cryptlen + sizeof(pctx->auth_tag),
				     req->iv);
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}

static inline unsigned int gcm_remain(unsigned int len)
{
	len &= 0xfU;
	return len ? 16 - len : 0;
}

static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
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static int gcm_hash_update(struct aead_request *req,
			   struct crypto_gcm_req_priv_ctx *pctx,
			   crypto_completion_t complete,
			   struct scatterlist *src,
			   unsigned int len)
{
	struct ahash_request *ahreq = &pctx->u.ahreq;
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	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   complete, req);
	ahash_request_set_crypt(ahreq, src, NULL, len);

	return crypto_ahash_update(ahreq);
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}

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static int gcm_hash_remain(struct aead_request *req,
			   struct crypto_gcm_req_priv_ctx *pctx,
			   unsigned int remain,
			   crypto_completion_t complete)
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{
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	struct ahash_request *ahreq = &pctx->u.ahreq;

	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   complete, req);
	sg_init_one(pctx->src, gcm_zeroes, remain);
	ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);

	return crypto_ahash_update(ahreq);
}

static int gcm_hash_len(struct aead_request *req,
			struct crypto_gcm_req_priv_ctx *pctx)
{
	struct ahash_request *ahreq = &pctx->u.ahreq;
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
	u128 lengths;

	lengths.a = cpu_to_be64(req->assoclen * 8);
	lengths.b = cpu_to_be64(gctx->cryptlen * 8);
	memcpy(pctx->iauth_tag, &lengths, 16);
	sg_init_one(pctx->src, pctx->iauth_tag, 16);
	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   gcm_hash_len_done, req);
	ahash_request_set_crypt(ahreq, pctx->src,
				NULL, sizeof(lengths));

	return crypto_ahash_update(ahreq);
}

static int gcm_hash_final(struct aead_request *req,
			  struct crypto_gcm_req_priv_ctx *pctx)
{
	struct ahash_request *ahreq = &pctx->u.ahreq;

	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   gcm_hash_final_done, req);
	ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);

	return crypto_ahash_final(ahreq);
}

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static void __gcm_hash_final_done(struct aead_request *req, int err)
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{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;

	if (!err)
		crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
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	gctx->complete(req, err);
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}

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static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
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{
	struct aead_request *req = areq->data;
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	__gcm_hash_final_done(req, err);
}

static void __gcm_hash_len_done(struct aead_request *req, int err)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);

	if (!err) {
		err = gcm_hash_final(req, pctx);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
	}

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	__gcm_hash_final_done(req, err);
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}

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static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
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{
	struct aead_request *req = areq->data;
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	__gcm_hash_len_done(req, err);
}

static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);

	if (!err) {
		err = gcm_hash_len(req, pctx);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
	}

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	__gcm_hash_len_done(req, err);
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}

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static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
				       int err)
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{
	struct aead_request *req = areq->data;
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	__gcm_hash_crypt_remain_done(req, err);
}

static void __gcm_hash_crypt_done(struct aead_request *req, int err)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
	unsigned int remain;

	if (!err) {
		remain = gcm_remain(gctx->cryptlen);
		BUG_ON(!remain);
		err = gcm_hash_remain(req, pctx, remain,
				      gcm_hash_crypt_remain_done);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
	}

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	__gcm_hash_crypt_remain_done(req, err);
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}

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static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
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{
	struct aead_request *req = areq->data;
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	__gcm_hash_crypt_done(req, err);
}

static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
	crypto_completion_t complete;
	unsigned int remain = 0;

	if (!err && gctx->cryptlen) {
		remain = gcm_remain(gctx->cryptlen);
		complete = remain ? gcm_hash_crypt_done :
			gcm_hash_crypt_remain_done;
		err = gcm_hash_update(req, pctx, complete,
				      gctx->src, gctx->cryptlen);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
	}

	if (remain)
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		__gcm_hash_crypt_done(req, err);
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	else
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		__gcm_hash_crypt_remain_done(req, err);
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}

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static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
				       int err)
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{
	struct aead_request *req = areq->data;
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	__gcm_hash_assoc_remain_done(req, err);
}

static void __gcm_hash_assoc_done(struct aead_request *req, int err)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
	unsigned int remain;

	if (!err) {
		remain = gcm_remain(req->assoclen);
		BUG_ON(!remain);
		err = gcm_hash_remain(req, pctx, remain,
				      gcm_hash_assoc_remain_done);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
	}

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	__gcm_hash_assoc_remain_done(req, err);
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}

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static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
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{
	struct aead_request *req = areq->data;
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	__gcm_hash_assoc_done(req, err);
}

static void __gcm_hash_init_done(struct aead_request *req, int err)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
	crypto_completion_t complete;
	unsigned int remain = 0;

	if (!err && req->assoclen) {
		remain = gcm_remain(req->assoclen);
		complete = remain ? gcm_hash_assoc_done :
			gcm_hash_assoc_remain_done;
		err = gcm_hash_update(req, pctx, complete,
				      req->assoc, req->assoclen);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
	}

	if (remain)
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		__gcm_hash_assoc_done(req, err);
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	else
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		__gcm_hash_assoc_remain_done(req, err);
}

static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
{
	struct aead_request *req = areq->data;

	__gcm_hash_init_done(req, err);
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}

static int gcm_hash(struct aead_request *req,
		    struct crypto_gcm_req_priv_ctx *pctx)
{
	struct ahash_request *ahreq = &pctx->u.ahreq;
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
	struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	unsigned int remain;
	crypto_completion_t complete;
	int err;

	ahash_request_set_tfm(ahreq, ctx->ghash);

	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   gcm_hash_init_done, req);
	err = crypto_ahash_init(ahreq);
	if (err)
		return err;
	remain = gcm_remain(req->assoclen);
	complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
	err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
	if (err)
		return err;
	if (remain) {
		err = gcm_hash_remain(req, pctx, remain,
				      gcm_hash_assoc_remain_done);
		if (err)
			return err;
	}
	remain = gcm_remain(gctx->cryptlen);
	complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
	err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
	if (err)
		return err;
	if (remain) {
		err = gcm_hash_remain(req, pctx, remain,
				      gcm_hash_crypt_remain_done);
		if (err)
			return err;
	}
	err = gcm_hash_len(req, pctx);
	if (err)
		return err;
	err = gcm_hash_final(req, pctx);
	if (err)
		return err;

	return 0;
}

static void gcm_enc_copy_hash(struct aead_request *req,
			      struct crypto_gcm_req_priv_ctx *pctx)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	u8 *auth_tag = pctx->auth_tag;
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	scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
				 crypto_aead_authsize(aead), 1);
}

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static void gcm_enc_hash_done(struct aead_request *req, int err)
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{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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	if (!err)
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		gcm_enc_copy_hash(req, pctx);
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	aead_request_complete(req, err);
}

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static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
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{
	struct aead_request *req = areq->data;
	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);

	if (!err) {
		err = gcm_hash(req, pctx);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
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		else if (!err) {
			crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
			gcm_enc_copy_hash(req, pctx);
		}
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	}

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	aead_request_complete(req, err);
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}

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static int crypto_gcm_encrypt(struct aead_request *req)
{
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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	struct ablkcipher_request *abreq = &pctx->u.abreq;
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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	int err;

	crypto_gcm_init_crypt(abreq, req, req->cryptlen);
	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
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					gcm_encrypt_done, req);

	gctx->src = req->dst;
	gctx->cryptlen = req->cryptlen;
	gctx->complete = gcm_enc_hash_done;
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	err = crypto_ablkcipher_encrypt(abreq);
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	if (err)
		return err;

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	err = gcm_hash(req, pctx);
	if (err)
		return err;

	crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
	gcm_enc_copy_hash(req, pctx);

	return 0;
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}

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static int crypto_gcm_verify(struct aead_request *req,
			     struct crypto_gcm_req_priv_ctx *pctx)
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{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	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;

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	crypto_xor(auth_tag, iauth_tag, 16);
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	scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
	return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
}

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static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
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{
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	struct aead_request *req = areq->data;
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	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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	if (!err)
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		err = crypto_gcm_verify(req, pctx);
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	aead_request_complete(req, err);
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}

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static void gcm_dec_hash_done(struct aead_request *req, int err)
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{
	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
	struct ablkcipher_request *abreq = &pctx->u.abreq;
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;

	if (!err) {
		ablkcipher_request_set_callback(abreq, aead_request_flags(req),
						gcm_decrypt_done, req);
		crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
		err = crypto_ablkcipher_decrypt(abreq);
		if (err == -EINPROGRESS || err == -EBUSY)
			return;
605 606
		else if (!err)
			err = crypto_gcm_verify(req, pctx);
607 608
	}

609
	aead_request_complete(req, err);
610 611
}

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static int crypto_gcm_decrypt(struct aead_request *req)
{
H
Herbert Xu 已提交
614
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
615
	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
616 617
	struct ablkcipher_request *abreq = &pctx->u.abreq;
	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
H
Herbert Xu 已提交
618
	unsigned int authsize = crypto_aead_authsize(aead);
619
	unsigned int cryptlen = req->cryptlen;
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620 621
	int err;

H
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622
	if (cryptlen < authsize)
M
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623
		return -EINVAL;
H
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624
	cryptlen -= authsize;
M
Mikko Herranen 已提交
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626 627 628
	gctx->src = req->src;
	gctx->cryptlen = cryptlen;
	gctx->complete = gcm_dec_hash_done;
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630 631 632
	err = gcm_hash(req, pctx);
	if (err)
		return err;
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633

634 635 636
	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
					gcm_decrypt_done, req);
	crypto_gcm_init_crypt(abreq, req, cryptlen);
637 638 639
	err = crypto_ablkcipher_decrypt(abreq);
	if (err)
		return err;
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641
	return crypto_gcm_verify(req, pctx);
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}

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;
650
	struct crypto_ahash *ghash;
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651 652 653
	unsigned long align;
	int err;

654 655 656 657
	ghash = crypto_spawn_ahash(&ictx->ghash);
	if (IS_ERR(ghash))
		return PTR_ERR(ghash);

658
	ctr = crypto_spawn_skcipher(&ictx->ctr);
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	err = PTR_ERR(ctr);
	if (IS_ERR(ctr))
661
		goto err_free_hash;
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662 663

	ctx->ctr = ctr;
664
	ctx->ghash = ghash;
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666
	align = crypto_tfm_alg_alignmask(tfm);
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	align &= ~(crypto_tfm_ctx_alignment() - 1);
668
	tfm->crt_aead.reqsize = align +
669 670 671 672 673
		offsetof(struct crypto_gcm_req_priv_ctx, u) +
		max(sizeof(struct ablkcipher_request) +
		    crypto_ablkcipher_reqsize(ctr),
		    sizeof(struct ahash_request) +
		    crypto_ahash_reqsize(ghash));
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	return 0;
676 677 678 679

err_free_hash:
	crypto_free_ahash(ghash);
	return err;
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680 681 682 683 684 685
}

static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);

686
	crypto_free_ahash(ctx->ghash);
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	crypto_free_ablkcipher(ctx->ctr);
}

690 691
static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
						       const char *full_name,
692 693
						       const char *ctr_name,
						       const char *ghash_name)
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{
695
	struct crypto_attr_type *algt;
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	struct crypto_instance *inst;
	struct crypto_alg *ctr;
698 699
	struct crypto_alg *ghash_alg;
	struct ahash_alg *ghash_ahash_alg;
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	struct gcm_instance_ctx *ctx;
	int err;

703 704
	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
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		return ERR_CAST(algt);
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707 708
	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return ERR_PTR(-EINVAL);
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710 711 712 713
	ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
				    CRYPTO_ALG_TYPE_HASH,
				    CRYPTO_ALG_TYPE_AHASH_MASK);
	if (IS_ERR(ghash_alg))
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		return ERR_CAST(ghash_alg);
715 716

	err = -ENOMEM;
717 718
	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst)
719
		goto out_put_ghash;
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721
	ctx = crypto_instance_ctx(inst);
722 723 724 725 726 727
	ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
	err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
				      inst);
	if (err)
		goto err_free_inst;

728 729 730 731 732
	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)
733
		goto err_drop_ghash;
734 735

	ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
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737
	/* We only support 16-byte blocks. */
738
	if (ctr->cra_ablkcipher.ivsize != 16)
739 740 741 742 743
		goto out_put_ctr;

	/* Not a stream cipher? */
	err = -EINVAL;
	if (ctr->cra_blocksize != 1)
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		goto out_put_ctr;

	err = -ENAMETOOLONG;
747
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
748 749
		     "gcm_base(%s,%s)", ctr->cra_driver_name,
		     ghash_alg->cra_driver_name) >=
750
	    CRYPTO_MAX_ALG_NAME)
751
		goto out_put_ctr;
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753 754
	memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);

755 756
	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
	inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
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	inst->alg.cra_priority = ctr->cra_priority;
758
	inst->alg.cra_blocksize = 1;
759
	inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
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	inst->alg.cra_type = &crypto_aead_type;
761
	inst->alg.cra_aead.ivsize = 16;
762
	inst->alg.cra_aead.maxauthsize = 16;
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	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;
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	inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
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	inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
	inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;

out:
772
	crypto_mod_put(ghash_alg);
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	return inst;
774 775 776

out_put_ctr:
	crypto_drop_skcipher(&ctx->ctr);
777 778
err_drop_ghash:
	crypto_drop_ahash(&ctx->ghash);
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err_free_inst:
	kfree(inst);
781
out_put_ghash:
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	inst = ERR_PTR(err);
	goto out;
}

786 787 788 789 790 791 792 793
static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
{
	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]);
	if (IS_ERR(cipher_name))
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		return ERR_CAST(cipher_name);
795 796 797 798 799 800 801 802 803

	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);

804
	return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
805 806
}

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static void crypto_gcm_free(struct crypto_instance *inst)
{
	struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);

811
	crypto_drop_skcipher(&ctx->ctr);
812
	crypto_drop_ahash(&ctx->ghash);
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	kfree(inst);
}

static struct crypto_template crypto_gcm_tmpl = {
	.name = "gcm",
	.alloc = crypto_gcm_alloc,
	.free = crypto_gcm_free,
	.module = THIS_MODULE,
};

823 824 825
static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
{
	const char *ctr_name;
826
	const char *ghash_name;
827 828 829 830
	char full_name[CRYPTO_MAX_ALG_NAME];

	ctr_name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(ctr_name))
J
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831
		return ERR_CAST(ctr_name);
832

833 834
	ghash_name = crypto_attr_alg_name(tb[2]);
	if (IS_ERR(ghash_name))
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835
		return ERR_CAST(ghash_name);
836 837 838

	if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
		     ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
839 840
		return ERR_PTR(-ENAMETOOLONG);

841
	return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
842 843 844 845 846 847 848 849 850
}

static struct crypto_template crypto_gcm_base_tmpl = {
	.name = "gcm_base",
	.alloc = crypto_gcm_base_alloc,
	.free = crypto_gcm_free,
	.module = THIS_MODULE,
};

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Herbert Xu 已提交
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
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);
	if (IS_ERR(algt))
J
Julia Lawall 已提交
968
		return ERR_CAST(algt);
H
Herbert Xu 已提交
969 970 971 972 973 974

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return ERR_PTR(-EINVAL);

	ccm_name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(ccm_name))
J
Julia Lawall 已提交
975
		return ERR_CAST(ccm_name);
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Herbert Xu 已提交
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053

	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,
};

1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_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 crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
				 unsigned int keylen)
{
	struct crypto_rfc4543_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_rfc4543_setauthsize(struct crypto_aead *parent,
				      unsigned int authsize)
{
	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);

	if (authsize != 16)
		return -EINVAL;

	return crypto_aead_setauthsize(ctx->child, authsize);
}

static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
						 int enc)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
	struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
	struct aead_request *subreq = &rctx->subreq;
	struct scatterlist *dst = req->dst;
	struct scatterlist *cipher = rctx->cipher;
	struct scatterlist *payload = rctx->payload;
	struct scatterlist *assoc = rctx->assoc;
	unsigned int authsize = crypto_aead_authsize(aead);
	unsigned int assoclen = req->assoclen;
	struct page *dstp;
	u8 *vdst;
	u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
			   crypto_aead_alignmask(ctx->child) + 1);

	memcpy(iv, ctx->nonce, 4);
	memcpy(iv + 4, req->iv, 8);

	/* construct cipher/plaintext */
	if (enc)
		memset(rctx->auth_tag, 0, authsize);
	else
		scatterwalk_map_and_copy(rctx->auth_tag, dst,
					 req->cryptlen - authsize,
					 authsize, 0);

	sg_init_one(cipher, rctx->auth_tag, authsize);

	/* construct the aad */
	dstp = sg_page(dst);
	vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;

	sg_init_table(payload, 2);
	sg_set_buf(payload, req->iv, 8);
1133
	scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
1134 1135 1136 1137 1138
	assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);

	sg_init_table(assoc, 2);
	sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
		    req->assoc->offset);
1139
	scatterwalk_crypto_chain(assoc, payload, 0, 2);
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216

	aead_request_set_tfm(subreq, ctx->child);
	aead_request_set_callback(subreq, req->base.flags, req->base.complete,
				  req->base.data);
	aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
	aead_request_set_assoc(subreq, assoc, assoclen);

	return subreq;
}

static int crypto_rfc4543_encrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
	struct aead_request *subreq;
	int err;

	subreq = crypto_rfc4543_crypt(req, 1);
	err = crypto_aead_encrypt(subreq);
	if (err)
		return err;

	scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
				 crypto_aead_authsize(aead), 1);

	return 0;
}

static int crypto_rfc4543_decrypt(struct aead_request *req)
{
	req = crypto_rfc4543_crypt(req, 0);

	return crypto_aead_decrypt(req);
}

static int crypto_rfc4543_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_rfc4543_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 crypto_rfc4543_req_ctx) +
				ALIGN(crypto_aead_reqsize(aead),
				      crypto_tfm_ctx_alignment()) +
				align + 16;

	return 0;
}

static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_aead(ctx->child);
}

static struct crypto_instance *crypto_rfc4543_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);
	if (IS_ERR(algt))
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Julia Lawall 已提交
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		return ERR_CAST(algt);
1218 1219 1220 1221 1222 1223

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return ERR_PTR(-EINVAL);

	ccm_name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(ccm_name))
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Julia Lawall 已提交
1224
		return ERR_CAST(ccm_name);
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302

	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,
		     "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
	    snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "rfc4543(%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_rfc4543_ctx);

	inst->alg.cra_init = crypto_rfc4543_init_tfm;
	inst->alg.cra_exit = crypto_rfc4543_exit_tfm;

	inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
	inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
	inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
	inst->alg.cra_aead.decrypt = crypto_rfc4543_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_rfc4543_free(struct crypto_instance *inst)
{
	crypto_drop_spawn(crypto_instance_ctx(inst));
	kfree(inst);
}

static struct crypto_template crypto_rfc4543_tmpl = {
	.name = "rfc4543",
	.alloc = crypto_rfc4543_alloc,
	.free = crypto_rfc4543_free,
	.module = THIS_MODULE,
};

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Mikko Herranen 已提交
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static int __init crypto_gcm_module_init(void)
{
1305 1306
	int err;

1307 1308 1309 1310
	gcm_zeroes = kzalloc(16, GFP_KERNEL);
	if (!gcm_zeroes)
		return -ENOMEM;

1311 1312 1313 1314 1315 1316 1317 1318
	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;

H
Herbert Xu 已提交
1319 1320 1321 1322
	err = crypto_register_template(&crypto_rfc4106_tmpl);
	if (err)
		goto out_undo_gcm;

1323 1324 1325 1326
	err = crypto_register_template(&crypto_rfc4543_tmpl);
	if (err)
		goto out_undo_rfc4106;

1327
	return 0;
1328

1329 1330
out_undo_rfc4106:
	crypto_unregister_template(&crypto_rfc4106_tmpl);
H
Herbert Xu 已提交
1331 1332
out_undo_gcm:
	crypto_unregister_template(&crypto_gcm_tmpl);
1333 1334
out_undo_base:
	crypto_unregister_template(&crypto_gcm_base_tmpl);
1335 1336 1337
out:
	kfree(gcm_zeroes);
	return err;
M
Mikko Herranen 已提交
1338 1339 1340 1341
}

static void __exit crypto_gcm_module_exit(void)
{
1342
	kfree(gcm_zeroes);
1343
	crypto_unregister_template(&crypto_rfc4543_tmpl);
H
Herbert Xu 已提交
1344
	crypto_unregister_template(&crypto_rfc4106_tmpl);
M
Mikko Herranen 已提交
1345
	crypto_unregister_template(&crypto_gcm_tmpl);
1346
	crypto_unregister_template(&crypto_gcm_base_tmpl);
M
Mikko Herranen 已提交
1347 1348 1349 1350 1351 1352 1353 1354
}

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>");
1355
MODULE_ALIAS("gcm_base");
H
Herbert Xu 已提交
1356
MODULE_ALIAS("rfc4106");
1357
MODULE_ALIAS("rfc4543");