[linux-2.6-block.git] / drivers / crypto / ccp / ccp-crypto-aes-cmac.c

/*
 * AMD Cryptographic Coprocessor (CCP) AES CMAC crypto API support
 *
 * Copyright (C) 2013 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 *
 * 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 <linux/module.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>

#include "ccp-crypto.h"

static int ccp_aes_cmac_complete(struct crypto_async_request *async_req,
				 int ret)
{
	struct ahash_request *req = ahash_request_cast(async_req);
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	unsigned int digest_size = crypto_ahash_digestsize(tfm);

	if (ret)
		goto e_free;

	if (rctx->hash_rem) {
		/* Save remaining data to buffer */
		unsigned int offset = rctx->nbytes - rctx->hash_rem;

		scatterwalk_map_and_copy(rctx->buf, rctx->src,
					 offset, rctx->hash_rem, 0);
		rctx->buf_count = rctx->hash_rem;
	} else {
		rctx->buf_count = 0;
	}

	/* Update result area if supplied */
	if (req->result)
		memcpy(req->result, rctx->iv, digest_size);

e_free:
	sg_free_table(&rctx->data_sg);

	return ret;
}

static int ccp_do_cmac_update(struct ahash_request *req, unsigned int nbytes,
			      unsigned int final)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	struct scatterlist *sg, *cmac_key_sg = NULL;
	unsigned int block_size =
		crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
	unsigned int need_pad, sg_count;
	gfp_t gfp;
	u64 len;
	int ret;

	if (!ctx->u.aes.key_len)
		return -EINVAL;

	if (nbytes)
		rctx->null_msg = 0;

	len = (u64)rctx->buf_count + (u64)nbytes;

	if (!final && (len <= block_size)) {
		scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
					 0, nbytes, 0);
		rctx->buf_count += nbytes;

		return 0;
	}

	rctx->src = req->src;
	rctx->nbytes = nbytes;

	rctx->final = final;
	rctx->hash_rem = final ? 0 : len & (block_size - 1);
	rctx->hash_cnt = len - rctx->hash_rem;
	if (!final && !rctx->hash_rem) {
		/* CCP can't do zero length final, so keep some data around */
		rctx->hash_cnt -= block_size;
		rctx->hash_rem = block_size;
	}

	if (final && (rctx->null_msg || (len & (block_size - 1))))
		need_pad = 1;
	else
		need_pad = 0;

	sg_init_one(&rctx->iv_sg, rctx->iv, sizeof(rctx->iv));

	/* Build the data scatterlist table - allocate enough entries for all
	 * possible data pieces (buffer, input data, padding)
	 */
	sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2;
	gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
		GFP_KERNEL : GFP_ATOMIC;
	ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
	if (ret)
		return ret;

	sg = NULL;
	if (rctx->buf_count) {
		sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
		if (!sg) {
			ret = -EINVAL;
			goto e_free;
		}
	}

	if (nbytes) {
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
		if (!sg) {
			ret = -EINVAL;
			goto e_free;
		}
	}

	if (need_pad) {
		int pad_length = block_size - (len & (block_size - 1));

		rctx->hash_cnt += pad_length;

		memset(rctx->pad, 0, sizeof(rctx->pad));
		rctx->pad[0] = 0x80;
		sg_init_one(&rctx->pad_sg, rctx->pad, pad_length);
		sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg);
		if (!sg) {
			ret = -EINVAL;
			goto e_free;
		}
	}
	if (sg) {
		sg_mark_end(sg);
		sg = rctx->data_sg.sgl;
	}

	/* Initialize the K1/K2 scatterlist */
	if (final)
		cmac_key_sg = (need_pad) ? &ctx->u.aes.k2_sg
					 : &ctx->u.aes.k1_sg;

	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	INIT_LIST_HEAD(&rctx->cmd.entry);
	rctx->cmd.engine = CCP_ENGINE_AES;
	rctx->cmd.u.aes.type = ctx->u.aes.type;
	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
	rctx->cmd.u.aes.action = CCP_AES_ACTION_ENCRYPT;
	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
	rctx->cmd.u.aes.iv = &rctx->iv_sg;
	rctx->cmd.u.aes.iv_len = AES_BLOCK_SIZE;
	rctx->cmd.u.aes.src = sg;
	rctx->cmd.u.aes.src_len = rctx->hash_cnt;
	rctx->cmd.u.aes.dst = NULL;
	rctx->cmd.u.aes.cmac_key = cmac_key_sg;
	rctx->cmd.u.aes.cmac_key_len = ctx->u.aes.kn_len;
	rctx->cmd.u.aes.cmac_final = final;

	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);

	return ret;

e_free:
	sg_free_table(&rctx->data_sg);

	return ret;
}

static int ccp_aes_cmac_init(struct ahash_request *req)
{
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);

	memset(rctx, 0, sizeof(*rctx));

	rctx->null_msg = 1;

	return 0;
}

static int ccp_aes_cmac_update(struct ahash_request *req)
{
	return ccp_do_cmac_update(req, req->nbytes, 0);
}

static int ccp_aes_cmac_final(struct ahash_request *req)
{
	return ccp_do_cmac_update(req, 0, 1);
}

static int ccp_aes_cmac_finup(struct ahash_request *req)
{
	return ccp_do_cmac_update(req, req->nbytes, 1);
}

static int ccp_aes_cmac_digest(struct ahash_request *req)
{
	int ret;

	ret = ccp_aes_cmac_init(req);
	if (ret)
		return ret;

	return ccp_aes_cmac_finup(req);
}

static int ccp_aes_cmac_export(struct ahash_request *req, void *out)
{
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	struct ccp_aes_cmac_exp_ctx state;

	state.null_msg = rctx->null_msg;
	memcpy(state.iv, rctx->iv, sizeof(state.iv));
	state.buf_count = rctx->buf_count;
	memcpy(state.buf, rctx->buf, sizeof(state.buf));

	/* 'out' may not be aligned so memcpy from local variable */
	memcpy(out, &state, sizeof(state));

	return 0;
}

static int ccp_aes_cmac_import(struct ahash_request *req, const void *in)
{
	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	struct ccp_aes_cmac_exp_ctx state;

	/* 'in' may not be aligned so memcpy to local variable */
	memcpy(&state, in, sizeof(state));

	memset(rctx, 0, sizeof(*rctx));
	rctx->null_msg = state.null_msg;
	memcpy(rctx->iv, state.iv, sizeof(rctx->iv));
	rctx->buf_count = state.buf_count;
	memcpy(rctx->buf, state.buf, sizeof(rctx->buf));

	return 0;
}

static int ccp_aes_cmac_setkey(struct crypto_ahash *tfm, const u8 *key,
			       unsigned int key_len)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
	struct ccp_crypto_ahash_alg *alg =
		ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
	u64 k0_hi, k0_lo, k1_hi, k1_lo, k2_hi, k2_lo;
	u64 rb_hi = 0x00, rb_lo = 0x87;
	__be64 *gk;
	int ret;

	switch (key_len) {
	case AES_KEYSIZE_128:
		ctx->u.aes.type = CCP_AES_TYPE_128;
		break;
	case AES_KEYSIZE_192:
		ctx->u.aes.type = CCP_AES_TYPE_192;
		break;
	case AES_KEYSIZE_256:
		ctx->u.aes.type = CCP_AES_TYPE_256;
		break;
	default:
		crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}
	ctx->u.aes.mode = alg->mode;

	/* Set to zero until complete */
	ctx->u.aes.key_len = 0;

	/* Set the key for the AES cipher used to generate the keys */
	ret = crypto_cipher_setkey(ctx->u.aes.tfm_cipher, key, key_len);
	if (ret)
		return ret;

	/* Encrypt a block of zeroes - use key area in context */
	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
	crypto_cipher_encrypt_one(ctx->u.aes.tfm_cipher, ctx->u.aes.key,
				  ctx->u.aes.key);

	/* Generate K1 and K2 */
	k0_hi = be64_to_cpu(*((__be64 *)ctx->u.aes.key));
	k0_lo = be64_to_cpu(*((__be64 *)ctx->u.aes.key + 1));

	k1_hi = (k0_hi << 1) | (k0_lo >> 63);
	k1_lo = k0_lo << 1;
	if (ctx->u.aes.key[0] & 0x80) {
		k1_hi ^= rb_hi;
		k1_lo ^= rb_lo;
	}
	gk = (__be64 *)ctx->u.aes.k1;
	*gk = cpu_to_be64(k1_hi);
	gk++;
	*gk = cpu_to_be64(k1_lo);

	k2_hi = (k1_hi << 1) | (k1_lo >> 63);
	k2_lo = k1_lo << 1;
	if (ctx->u.aes.k1[0] & 0x80) {
		k2_hi ^= rb_hi;
		k2_lo ^= rb_lo;
	}
	gk = (__be64 *)ctx->u.aes.k2;
	*gk = cpu_to_be64(k2_hi);
	gk++;
	*gk = cpu_to_be64(k2_lo);

	ctx->u.aes.kn_len = sizeof(ctx->u.aes.k1);
	sg_init_one(&ctx->u.aes.k1_sg, ctx->u.aes.k1, sizeof(ctx->u.aes.k1));
	sg_init_one(&ctx->u.aes.k2_sg, ctx->u.aes.k2, sizeof(ctx->u.aes.k2));

	/* Save the supplied key */
	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
	memcpy(ctx->u.aes.key, key, key_len);
	ctx->u.aes.key_len = key_len;
	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);

	return ret;
}

static int ccp_aes_cmac_cra_init(struct crypto_tfm *tfm)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
	struct crypto_cipher *cipher_tfm;

	ctx->complete = ccp_aes_cmac_complete;
	ctx->u.aes.key_len = 0;

	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_aes_cmac_req_ctx));

	cipher_tfm = crypto_alloc_cipher("aes", 0,
					 CRYPTO_ALG_ASYNC |
					 CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(cipher_tfm)) {
		pr_warn("could not load aes cipher driver\n");
		return PTR_ERR(cipher_tfm);
	}
	ctx->u.aes.tfm_cipher = cipher_tfm;

	return 0;
}

static void ccp_aes_cmac_cra_exit(struct crypto_tfm *tfm)
{
	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);

	if (ctx->u.aes.tfm_cipher)
		crypto_free_cipher(ctx->u.aes.tfm_cipher);
	ctx->u.aes.tfm_cipher = NULL;
}

int ccp_register_aes_cmac_algs(struct list_head *head)
{
	struct ccp_crypto_ahash_alg *ccp_alg;
	struct ahash_alg *alg;
	struct hash_alg_common *halg;
	struct crypto_alg *base;
	int ret;

	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	if (!ccp_alg)
		return -ENOMEM;

	INIT_LIST_HEAD(&ccp_alg->entry);
	ccp_alg->mode = CCP_AES_MODE_CMAC;

	alg = &ccp_alg->alg;
	alg->init = ccp_aes_cmac_init;
	alg->update = ccp_aes_cmac_update;
	alg->final = ccp_aes_cmac_final;
	alg->finup = ccp_aes_cmac_finup;
	alg->digest = ccp_aes_cmac_digest;
	alg->export = ccp_aes_cmac_export;
	alg->import = ccp_aes_cmac_import;
	alg->setkey = ccp_aes_cmac_setkey;

	halg = &alg->halg;
	halg->digestsize = AES_BLOCK_SIZE;
	halg->statesize = sizeof(struct ccp_aes_cmac_exp_ctx);

	base = &halg->base;
	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)");
	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "cmac-aes-ccp");
	base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
			  CRYPTO_ALG_KERN_DRIVER_ONLY |
			  CRYPTO_ALG_NEED_FALLBACK;
	base->cra_blocksize = AES_BLOCK_SIZE;
	base->cra_ctxsize = sizeof(struct ccp_ctx);
	base->cra_priority = CCP_CRA_PRIORITY;
	base->cra_type = &crypto_ahash_type;
	base->cra_init = ccp_aes_cmac_cra_init;
	base->cra_exit = ccp_aes_cmac_cra_exit;
	base->cra_module = THIS_MODULE;

	ret = crypto_register_ahash(alg);
	if (ret) {
		pr_err("%s ahash algorithm registration error (%d)\n",
		       base->cra_name, ret);
		kfree(ccp_alg);
		return ret;
	}

	list_add(&ccp_alg->entry, head);

	return 0;
}
Commit	Line	Data
7c185371 TL	1	/*
	2	* AMD Cryptographic Coprocessor (CCP) AES CMAC crypto API support
	3	*
	4	* Copyright (C) 2013 Advanced Micro Devices, Inc.
	5	*
	6	* Author: Tom Lendacky <thomas.lendacky@amd.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/sched.h>
	15	#include <linux/delay.h>
	16	#include <linux/scatterlist.h>
	17	#include <linux/crypto.h>
	18	#include <crypto/algapi.h>
	19	#include <crypto/aes.h>
	20	#include <crypto/hash.h>
	21	#include <crypto/internal/hash.h>
	22	#include <crypto/scatterwalk.h>
	23
	24	#include "ccp-crypto.h"
	25
7c185371 TL	26	static int ccp_aes_cmac_complete(struct crypto_async_request *async_req,
	27	int ret)
	28	{
	29	struct ahash_request *req = ahash_request_cast(async_req);
	30	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	31	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	32	unsigned int digest_size = crypto_ahash_digestsize(tfm);
	33
	34	if (ret)
	35	goto e_free;
	36
	37	if (rctx->hash_rem) {
	38	/* Save remaining data to buffer */
81a59f00	39	unsigned int offset = rctx->nbytes - rctx->hash_rem;
8db88467	40
81a59f00 TL	41	scatterwalk_map_and_copy(rctx->buf, rctx->src,
81a59f00 TL	42	offset, rctx->hash_rem, 0);
7c185371	43	rctx->buf_count = rctx->hash_rem;
8db88467	44	} else {
7c185371	45	rctx->buf_count = 0;
8db88467	46	}
7c185371	47
393897c5 TL	48	/* Update result area if supplied */
	49	if (req->result)
	50	memcpy(req->result, rctx->iv, digest_size);
7c185371 TL	51
	52	e_free:
	53	sg_free_table(&rctx->data_sg);
	54
	55	return ret;
	56	}
	57
	58	static int ccp_do_cmac_update(struct ahash_request *req, unsigned int nbytes,
	59	unsigned int final)
	60	{
	61	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	62	struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
	63	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	64	struct scatterlist sg, cmac_key_sg = NULL;
	65	unsigned int block_size =
	66	crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
81a59f00	67	unsigned int need_pad, sg_count;
5258de8a	68	gfp_t gfp;
81a59f00	69	u64 len;
7c185371 TL	70	int ret;
7c185371 TL	71
369f3dab	72	if (!ctx->u.aes.key_len)
7c185371	73	return -EINVAL;
7c185371 TL	74
	75	if (nbytes)
	76	rctx->null_msg = 0;
	77
81a59f00 TL	78	len = (u64)rctx->buf_count + (u64)nbytes;
	79
	80	if (!final && (len <= block_size)) {
7c185371 TL	81	scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
	82	0, nbytes, 0);
	83	rctx->buf_count += nbytes;
	84
	85	return 0;
	86	}
	87
81a59f00 TL	88	rctx->src = req->src;
81a59f00 TL	89	rctx->nbytes = nbytes;
7c185371 TL	90
7c185371 TL	91	rctx->final = final;
81a59f00 TL	92	rctx->hash_rem = final ? 0 : len & (block_size - 1);
	93	rctx->hash_cnt = len - rctx->hash_rem;
	94	if (!final && !rctx->hash_rem) {
7c185371 TL	95	/* CCP can't do zero length final, so keep some data around */
	96	rctx->hash_cnt -= block_size;
	97	rctx->hash_rem = block_size;
	98	}
	99
	100	if (final && (rctx->null_msg \|\| (len & (block_size - 1))))
	101	need_pad = 1;
	102	else
	103	need_pad = 0;
	104
	105	sg_init_one(&rctx->iv_sg, rctx->iv, sizeof(rctx->iv));
	106
	107	/* Build the data scatterlist table - allocate enough entries for all
	108	* possible data pieces (buffer, input data, padding)
	109	*/
	110	sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2;
5258de8a TL	111	gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
	112	GFP_KERNEL : GFP_ATOMIC;
	113	ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
7c185371 TL	114	if (ret)
	115	return ret;
	116
	117	sg = NULL;
	118	if (rctx->buf_count) {
	119	sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
	120	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
355eba5d TL	121	if (!sg) {
	122	ret = -EINVAL;
	123	goto e_free;
	124	}
7c185371 TL	125	}
7c185371 TL	126
355eba5d	127	if (nbytes) {
7c185371	128	sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
355eba5d TL	129	if (!sg) {
	130	ret = -EINVAL;
	131	goto e_free;
	132	}
	133	}
7c185371 TL	134
	135	if (need_pad) {
	136	int pad_length = block_size - (len & (block_size - 1));
	137
	138	rctx->hash_cnt += pad_length;
	139
	140	memset(rctx->pad, 0, sizeof(rctx->pad));
	141	rctx->pad[0] = 0x80;
	142	sg_init_one(&rctx->pad_sg, rctx->pad, pad_length);
	143	sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg);
355eba5d TL	144	if (!sg) {
	145	ret = -EINVAL;
	146	goto e_free;
	147	}
7c185371	148	}
77dc4a51	149	if (sg) {
7c185371	150	sg_mark_end(sg);
77dc4a51 TL	151	sg = rctx->data_sg.sgl;
77dc4a51 TL	152	}
7c185371 TL	153
	154	/* Initialize the K1/K2 scatterlist */
	155	if (final)
	156	cmac_key_sg = (need_pad) ? &ctx->u.aes.k2_sg
	157	: &ctx->u.aes.k1_sg;
	158
	159	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
	160	INIT_LIST_HEAD(&rctx->cmd.entry);
	161	rctx->cmd.engine = CCP_ENGINE_AES;
	162	rctx->cmd.u.aes.type = ctx->u.aes.type;
	163	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
	164	rctx->cmd.u.aes.action = CCP_AES_ACTION_ENCRYPT;
	165	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
	166	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
	167	rctx->cmd.u.aes.iv = &rctx->iv_sg;
	168	rctx->cmd.u.aes.iv_len = AES_BLOCK_SIZE;
77dc4a51	169	rctx->cmd.u.aes.src = sg;
7c185371 TL	170	rctx->cmd.u.aes.src_len = rctx->hash_cnt;
	171	rctx->cmd.u.aes.dst = NULL;
	172	rctx->cmd.u.aes.cmac_key = cmac_key_sg;
	173	rctx->cmd.u.aes.cmac_key_len = ctx->u.aes.kn_len;
	174	rctx->cmd.u.aes.cmac_final = final;
	175
	176	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
	177
355eba5d TL	178	return ret;
	179
	180	e_free:
	181	sg_free_table(&rctx->data_sg);
	182
7c185371 TL	183	return ret;
	184	}
	185
	186	static int ccp_aes_cmac_init(struct ahash_request *req)
	187	{
	188	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
	189
	190	memset(rctx, 0, sizeof(*rctx));
	191
	192	rctx->null_msg = 1;
	193
	194	return 0;
	195	}
	196
	197	static int ccp_aes_cmac_update(struct ahash_request *req)
	198	{
	199	return ccp_do_cmac_update(req, req->nbytes, 0);
	200	}
	201
	202	static int ccp_aes_cmac_final(struct ahash_request *req)
	203	{
	204	return ccp_do_cmac_update(req, 0, 1);
	205	}
	206
	207	static int ccp_aes_cmac_finup(struct ahash_request *req)
	208	{
	209	return ccp_do_cmac_update(req, req->nbytes, 1);
	210	}
	211
	212	static int ccp_aes_cmac_digest(struct ahash_request *req)
	213	{
	214	int ret;
	215
	216	ret = ccp_aes_cmac_init(req);
	217	if (ret)
	218	return ret;
	219
82d1585b	220	return ccp_aes_cmac_finup(req);
7c185371 TL	221	}
7c185371 TL	222
952bce97 TL	223	static int ccp_aes_cmac_export(struct ahash_request req, void out)
	224	{
	225	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
b31dde2a	226	struct ccp_aes_cmac_exp_ctx state;
952bce97	227
b31dde2a TL	228	state.null_msg = rctx->null_msg;
	229	memcpy(state.iv, rctx->iv, sizeof(state.iv));
	230	state.buf_count = rctx->buf_count;
	231	memcpy(state.buf, rctx->buf, sizeof(state.buf));
	232
	233	/* 'out' may not be aligned so memcpy from local variable */
	234	memcpy(out, &state, sizeof(state));
952bce97 TL	235
	236	return 0;
	237	}
	238
	239	static int ccp_aes_cmac_import(struct ahash_request req, const void in)
	240	{
	241	struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
b31dde2a TL	242	struct ccp_aes_cmac_exp_ctx state;
	243
	244	/* 'in' may not be aligned so memcpy to local variable */
	245	memcpy(&state, in, sizeof(state));
952bce97	246
ce0ae266	247	memset(rctx, 0, sizeof(*rctx));
b31dde2a TL	248	rctx->null_msg = state.null_msg;
	249	memcpy(rctx->iv, state.iv, sizeof(rctx->iv));
	250	rctx->buf_count = state.buf_count;
	251	memcpy(rctx->buf, state.buf, sizeof(rctx->buf));
952bce97 TL	252
	253	return 0;
	254	}
	255
7c185371	256	static int ccp_aes_cmac_setkey(struct crypto_ahash tfm, const u8 key,
8db88467	257	unsigned int key_len)
7c185371 TL	258	{
	259	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
	260	struct ccp_crypto_ahash_alg *alg =
	261	ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
	262	u64 k0_hi, k0_lo, k1_hi, k1_lo, k2_hi, k2_lo;
	263	u64 rb_hi = 0x00, rb_lo = 0x87;
	264	__be64 *gk;
	265	int ret;
	266
	267	switch (key_len) {
	268	case AES_KEYSIZE_128:
	269	ctx->u.aes.type = CCP_AES_TYPE_128;
	270	break;
	271	case AES_KEYSIZE_192:
	272	ctx->u.aes.type = CCP_AES_TYPE_192;
	273	break;
	274	case AES_KEYSIZE_256:
	275	ctx->u.aes.type = CCP_AES_TYPE_256;
	276	break;
	277	default:
	278	crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	279	return -EINVAL;
	280	}
	281	ctx->u.aes.mode = alg->mode;
	282
	283	/* Set to zero until complete */
	284	ctx->u.aes.key_len = 0;
	285
	286	/* Set the key for the AES cipher used to generate the keys */
	287	ret = crypto_cipher_setkey(ctx->u.aes.tfm_cipher, key, key_len);
	288	if (ret)
	289	return ret;
	290
	291	/* Encrypt a block of zeroes - use key area in context */
	292	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
	293	crypto_cipher_encrypt_one(ctx->u.aes.tfm_cipher, ctx->u.aes.key,
	294	ctx->u.aes.key);
	295
	296	/* Generate K1 and K2 */
	297	k0_hi = be64_to_cpu(((__be64 )ctx->u.aes.key));
	298	k0_lo = be64_to_cpu(((__be64 )ctx->u.aes.key + 1));
	299
	300	k1_hi = (k0_hi << 1) \| (k0_lo >> 63);
	301	k1_lo = k0_lo << 1;
	302	if (ctx->u.aes.key[0] & 0x80) {
	303	k1_hi ^= rb_hi;
	304	k1_lo ^= rb_lo;
	305	}
	306	gk = (__be64 *)ctx->u.aes.k1;
	307	*gk = cpu_to_be64(k1_hi);
	308	gk++;
	309	*gk = cpu_to_be64(k1_lo);
	310
	311	k2_hi = (k1_hi << 1) \| (k1_lo >> 63);
	312	k2_lo = k1_lo << 1;
	313	if (ctx->u.aes.k1[0] & 0x80) {
	314	k2_hi ^= rb_hi;
	315	k2_lo ^= rb_lo;
	316	}
	317	gk = (__be64 *)ctx->u.aes.k2;
	318	*gk = cpu_to_be64(k2_hi);
	319	gk++;
	320	*gk = cpu_to_be64(k2_lo);
	321
322	ctx->u.aes.kn_len = sizeof(ctx->u.aes.k1);
323	sg_init_one(&ctx->u.aes.k1_sg, ctx->u.aes.k1, sizeof(ctx->u.aes.k1));
324	sg_init_one(&ctx->u.aes.k2_sg, ctx->u.aes.k2, sizeof(ctx->u.aes.k2));
325
326	/* Save the supplied key */
327	memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key));
328	memcpy(ctx->u.aes.key, key, key_len);
329	ctx->u.aes.key_len = key_len;
330	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
331
332	return ret;
333	}
334
335	static int ccp_aes_cmac_cra_init(struct crypto_tfm *tfm)
336	{
337	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
338	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
339	struct crypto_cipher *cipher_tfm;
340
341	ctx->complete = ccp_aes_cmac_complete;
342	ctx->u.aes.key_len = 0;
343
344	crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_aes_cmac_req_ctx));
345
346	cipher_tfm = crypto_alloc_cipher("aes", 0,
8db88467 TL	347	CRYPTO_ALG_ASYNC \|
8db88467 TL	348	CRYPTO_ALG_NEED_FALLBACK);
7c185371 TL	349	if (IS_ERR(cipher_tfm)) {
	350	pr_warn("could not load aes cipher driver\n");
	351	return PTR_ERR(cipher_tfm);
	352	}
	353	ctx->u.aes.tfm_cipher = cipher_tfm;
	354
	355	return 0;
	356	}
	357
	358	static void ccp_aes_cmac_cra_exit(struct crypto_tfm *tfm)
	359	{
	360	struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
	361
	362	if (ctx->u.aes.tfm_cipher)
	363	crypto_free_cipher(ctx->u.aes.tfm_cipher);
	364	ctx->u.aes.tfm_cipher = NULL;
	365	}
	366
	367	int ccp_register_aes_cmac_algs(struct list_head *head)
	368	{
	369	struct ccp_crypto_ahash_alg *ccp_alg;
	370	struct ahash_alg *alg;
	371	struct hash_alg_common *halg;
	372	struct crypto_alg *base;
	373	int ret;
	374
	375	ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
	376	if (!ccp_alg)
	377	return -ENOMEM;
	378
	379	INIT_LIST_HEAD(&ccp_alg->entry);
	380	ccp_alg->mode = CCP_AES_MODE_CMAC;
	381
	382	alg = &ccp_alg->alg;
	383	alg->init = ccp_aes_cmac_init;
	384	alg->update = ccp_aes_cmac_update;
	385	alg->final = ccp_aes_cmac_final;
	386	alg->finup = ccp_aes_cmac_finup;
	387	alg->digest = ccp_aes_cmac_digest;
952bce97 TL	388	alg->export = ccp_aes_cmac_export;
952bce97 TL	389	alg->import = ccp_aes_cmac_import;
7c185371 TL	390	alg->setkey = ccp_aes_cmac_setkey;
	391
	392	halg = &alg->halg;
	393	halg->digestsize = AES_BLOCK_SIZE;
d1662165	394	halg->statesize = sizeof(struct ccp_aes_cmac_exp_ctx);
7c185371 TL	395
	396	base = &halg->base;
	397	snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)");
	398	snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "cmac-aes-ccp");
	399	base->cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC \|
	400	CRYPTO_ALG_KERN_DRIVER_ONLY \|
	401	CRYPTO_ALG_NEED_FALLBACK;
	402	base->cra_blocksize = AES_BLOCK_SIZE;
	403	base->cra_ctxsize = sizeof(struct ccp_ctx);
	404	base->cra_priority = CCP_CRA_PRIORITY;
	405	base->cra_type = &crypto_ahash_type;
	406	base->cra_init = ccp_aes_cmac_cra_init;
	407	base->cra_exit = ccp_aes_cmac_cra_exit;
	408	base->cra_module = THIS_MODULE;
	409
	410	ret = crypto_register_ahash(alg);
	411	if (ret) {
	412	pr_err("%s ahash algorithm registration error (%d)\n",
8db88467	413	base->cra_name, ret);
7c185371 TL	414	kfree(ccp_alg);
	415	return ret;
	416	}
	417
	418	list_add(&ccp_alg->entry, head);
	419
	420	return 0;
	421	}