[linux-2.6-block.git] / drivers / crypto / nx / nx-aes-ccm.c

/**
 * AES CCM routines supporting the Power 7+ Nest Accelerators driver
 *
 * Copyright (C) 2012 International Business Machines Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 only.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Author: Kent Yoder <yoder1@us.ibm.com>
 */

#include <crypto/internal/aead.h>
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/scatterwalk.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <asm/vio.h>

#include "nx_csbcpb.h"
#include "nx.h"


static int ccm_aes_nx_set_key(struct crypto_aead *tfm,
			      const u8           *in_key,
			      unsigned int        key_len)
{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
	struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;

	nx_ctx_init(nx_ctx, HCOP_FC_AES);

	switch (key_len) {
	case AES_KEYSIZE_128:
		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
		NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128);
		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
		break;
	default:
		return -EINVAL;
	}

	csbcpb->cpb.hdr.mode = NX_MODE_AES_CCM;
	memcpy(csbcpb->cpb.aes_ccm.key, in_key, key_len);

	csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_CCA;
	memcpy(csbcpb_aead->cpb.aes_cca.key, in_key, key_len);

	return 0;

}

static int ccm4309_aes_nx_set_key(struct crypto_aead *tfm,
				  const u8           *in_key,
				  unsigned int        key_len)
{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);

	if (key_len < 3)
		return -EINVAL;

	key_len -= 3;

	memcpy(nx_ctx->priv.ccm.nonce, in_key + key_len, 3);

	return ccm_aes_nx_set_key(tfm, in_key, key_len);
}

static int ccm_aes_nx_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;
	}

	crypto_aead_crt(tfm)->authsize = authsize;

	return 0;
}

static int ccm4309_aes_nx_setauthsize(struct crypto_aead *tfm,
				      unsigned int authsize)
{
	switch (authsize) {
	case 8:
	case 12:
	case 16:
		break;
	default:
		return -EINVAL;
	}

	crypto_aead_crt(tfm)->authsize = authsize;

	return 0;
}

/* taken from crypto/ccm.c */
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 > (unsigned int)(1 << (8 * csize)))
		return -EOVERFLOW;

	data = cpu_to_be32(msglen);
	memcpy(block - csize, (u8 *)&data + 4 - csize, csize);

	return 0;
}

/* taken from crypto/ccm.c */
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;
}

/* based on code from crypto/ccm.c */
static int generate_b0(u8 *iv, unsigned int assoclen, unsigned int authsize,
		       unsigned int cryptlen, u8 *b0)
{
	unsigned int l, lp, m = authsize;
	int rc;

	memcpy(b0, iv, 16);

	lp = b0[0];
	l = lp + 1;

	/* set m, bits 3-5 */
	*b0 |= (8 * ((m - 2) / 2));

	/* set adata, bit 6, if associated data is used */
	if (assoclen)
		*b0 |= 64;

	rc = set_msg_len(b0 + 16 - l, cryptlen, l);

	return rc;
}

static int generate_pat(u8                   *iv,
			struct aead_request  *req,
			struct nx_crypto_ctx *nx_ctx,
			unsigned int          authsize,
			unsigned int          nbytes,
			u8                   *out)
{
	struct nx_sg *nx_insg = nx_ctx->in_sg;
	struct nx_sg *nx_outsg = nx_ctx->out_sg;
	unsigned int iauth_len = 0;
	struct vio_pfo_op *op = NULL;
	u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
	int rc;

	/* zero the ctr value */
	memset(iv + 15 - iv[0], 0, iv[0] + 1);

	if (!req->assoclen) {
		b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
	} else if (req->assoclen <= 14) {
		/* if associated data is 14 bytes or less, we do 1 GCM
		 * operation on 2 AES blocks, B0 (stored in the csbcpb) and B1,
		 * which is fed in through the source buffers here */
		b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
		b1 = nx_ctx->priv.ccm.iauth_tag;
		iauth_len = req->assoclen;

		nx_insg = nx_build_sg_list(nx_insg, b1, 16, nx_ctx->ap->sglen);
		nx_outsg = nx_build_sg_list(nx_outsg, tmp, 16,
					    nx_ctx->ap->sglen);

		/* inlen should be negative, indicating to phyp that its a
		 * pointer to an sg list */
		nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
					sizeof(struct nx_sg);
		nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) *
					sizeof(struct nx_sg);

		NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_ENDE_ENCRYPT;
		NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_INTERMEDIATE;

		op = &nx_ctx->op;
		result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
	} else if (req->assoclen <= 65280) {
		/* if associated data is less than (2^16 - 2^8), we construct
		 * B1 differently and feed in the associated data to a CCA
		 * operation */
		b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
		b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
		iauth_len = 14;

		/* remaining assoc data must have scatterlist built for it */
		nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen,
					    req->assoc, iauth_len,
					    req->assoclen - iauth_len);
		nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
						sizeof(struct nx_sg);

		op = &nx_ctx->op_aead;
		result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
	} else {
		/* if associated data is less than (2^32), we construct B1
		 * differently yet again and feed in the associated data to a
		 * CCA operation */
		pr_err("associated data len is %u bytes (returning -EINVAL)\n",
		       req->assoclen);
		rc = -EINVAL;
	}

	rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
	if (rc)
		goto done;

	if (b1) {
		memset(b1, 0, 16);
		*(u16 *)b1 = (u16)req->assoclen;

		scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
					 iauth_len, SCATTERWALK_FROM_SG);

		rc = nx_hcall_sync(nx_ctx, op,
				   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
		if (rc)
			goto done;

		atomic_inc(&(nx_ctx->stats->aes_ops));
		atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));

		memcpy(out, result, AES_BLOCK_SIZE);
	}
done:
	return rc;
}

static int ccm_nx_decrypt(struct aead_request   *req,
			  struct blkcipher_desc *desc)
{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
	unsigned int nbytes = req->cryptlen;
	unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
	struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
	int rc = -1;

	if (nbytes > nx_ctx->ap->databytelen)
		return -EINVAL;

	nbytes -= authsize;

	/* copy out the auth tag to compare with later */
	scatterwalk_map_and_copy(priv->oauth_tag,
				 req->src, nbytes, authsize,
				 SCATTERWALK_FROM_SG);

	rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
			  csbcpb->cpb.aes_ccm.in_pat_or_b0);
	if (rc)
		goto out;

	rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
			       csbcpb->cpb.aes_ccm.iv_or_ctr);
	if (rc)
		goto out;

	NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
	NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_INTERMEDIATE;

	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
			   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
	if (rc)
		goto out;

	atomic_inc(&(nx_ctx->stats->aes_ops));
	atomic64_add(csbcpb->csb.processed_byte_count,
		     &(nx_ctx->stats->aes_bytes));

	rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
		    authsize) ? -EBADMSG : 0;
out:
	return rc;
}

static int ccm_nx_encrypt(struct aead_request   *req,
			  struct blkcipher_desc *desc)
{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
	unsigned int nbytes = req->cryptlen;
	unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
	int rc = -1;

	if (nbytes > nx_ctx->ap->databytelen)
		return -EINVAL;

	rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
			  csbcpb->cpb.aes_ccm.in_pat_or_b0);
	if (rc)
		goto out;

	rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
			       csbcpb->cpb.aes_ccm.iv_or_ctr);
	if (rc)
		goto out;

	NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
	NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;

	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
			   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
	if (rc)
		goto out;

	atomic_inc(&(nx_ctx->stats->aes_ops));
	atomic64_add(csbcpb->csb.processed_byte_count,
		     &(nx_ctx->stats->aes_bytes));

	/* copy out the auth tag */
	scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
				 req->dst, nbytes, authsize,
				 SCATTERWALK_TO_SG);
out:
	return rc;
}

static int ccm4309_aes_nx_encrypt(struct aead_request *req)
{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
	struct blkcipher_desc desc;
	u8 *iv = nx_ctx->priv.ccm.iv;

	iv[0] = 3;
	memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
	memcpy(iv + 4, req->iv, 8);

	desc.info = iv;
	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;

	return ccm_nx_encrypt(req, &desc);
}

static int ccm_aes_nx_encrypt(struct aead_request *req)
{
	struct blkcipher_desc desc;
	int rc;

	desc.info = req->iv;
	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;

	rc = crypto_ccm_check_iv(desc.info);
	if (rc)
		return rc;

	return ccm_nx_encrypt(req, &desc);
}

static int ccm4309_aes_nx_decrypt(struct aead_request *req)
{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
	struct blkcipher_desc desc;
	u8 *iv = nx_ctx->priv.ccm.iv;

	iv[0] = 3;
	memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
	memcpy(iv + 4, req->iv, 8);

	desc.info = iv;
	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;

	return ccm_nx_decrypt(req, &desc);
}

static int ccm_aes_nx_decrypt(struct aead_request *req)
{
	struct blkcipher_desc desc;
	int rc;

	desc.info = req->iv;
	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;

	rc = crypto_ccm_check_iv(desc.info);
	if (rc)
		return rc;

	return ccm_nx_decrypt(req, &desc);
}

/* tell the block cipher walk routines that this is a stream cipher by
 * setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
 * during encrypt/decrypt doesn't solve this problem, because it calls
 * blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
 * but instead uses this tfm->blocksize. */
struct crypto_alg nx_ccm_aes_alg = {
	.cra_name        = "ccm(aes)",
	.cra_driver_name = "ccm-aes-nx",
	.cra_priority    = 300,
	.cra_flags       = CRYPTO_ALG_TYPE_AEAD |
			   CRYPTO_ALG_NEED_FALLBACK,
	.cra_blocksize   = 1,
	.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
	.cra_type        = &crypto_aead_type,
	.cra_module      = THIS_MODULE,
	.cra_init        = nx_crypto_ctx_aes_ccm_init,
	.cra_exit        = nx_crypto_ctx_exit,
	.cra_aead = {
		.ivsize      = AES_BLOCK_SIZE,
		.maxauthsize = AES_BLOCK_SIZE,
		.setkey      = ccm_aes_nx_set_key,
		.setauthsize = ccm_aes_nx_setauthsize,
		.encrypt     = ccm_aes_nx_encrypt,
		.decrypt     = ccm_aes_nx_decrypt,
	}
};

struct crypto_alg nx_ccm4309_aes_alg = {
	.cra_name        = "rfc4309(ccm(aes))",
	.cra_driver_name = "rfc4309-ccm-aes-nx",
	.cra_priority    = 300,
	.cra_flags       = CRYPTO_ALG_TYPE_AEAD |
			   CRYPTO_ALG_NEED_FALLBACK,
	.cra_blocksize   = 1,
	.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
	.cra_type        = &crypto_nivaead_type,
	.cra_module      = THIS_MODULE,
	.cra_init        = nx_crypto_ctx_aes_ccm_init,
	.cra_exit        = nx_crypto_ctx_exit,
	.cra_aead = {
		.ivsize      = 8,
		.maxauthsize = AES_BLOCK_SIZE,
		.setkey      = ccm4309_aes_nx_set_key,
		.setauthsize = ccm4309_aes_nx_setauthsize,
		.encrypt     = ccm4309_aes_nx_encrypt,
		.decrypt     = ccm4309_aes_nx_decrypt,
		.geniv       = "seqiv",
	}
};
Commit	Line	Data
a00bd6e6 KY	1	/**
	2	* AES CCM routines supporting the Power 7+ Nest Accelerators driver
	3	*
	4	* Copyright (C) 2012 International Business Machines Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 only.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*
	19	* Author: Kent Yoder <yoder1@us.ibm.com>
	20	*/
	21
	22	#include <crypto/internal/aead.h>
	23	#include <crypto/aes.h>
	24	#include <crypto/algapi.h>
	25	#include <crypto/scatterwalk.h>
	26	#include <linux/module.h>
	27	#include <linux/types.h>
	28	#include <linux/crypto.h>
	29	#include <asm/vio.h>
	30
	31	#include "nx_csbcpb.h"
	32	#include "nx.h"
	33
	34
	35	static int ccm_aes_nx_set_key(struct crypto_aead *tfm,
	36	const u8 *in_key,
	37	unsigned int key_len)
	38	{
	39	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
	40	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
	41	struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
	42
	43	nx_ctx_init(nx_ctx, HCOP_FC_AES);
	44
	45	switch (key_len) {
	46	case AES_KEYSIZE_128:
	47	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
	48	NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128);
	49	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
	50	break;
	51	default:
	52	return -EINVAL;
	53	}
	54
	55	csbcpb->cpb.hdr.mode = NX_MODE_AES_CCM;
	56	memcpy(csbcpb->cpb.aes_ccm.key, in_key, key_len);
	57
	58	csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_CCA;
	59	memcpy(csbcpb_aead->cpb.aes_cca.key, in_key, key_len);
	60
	61	return 0;
	62
	63	}
	64
65	static int ccm4309_aes_nx_set_key(struct crypto_aead *tfm,
66	const u8 *in_key,
67	unsigned int key_len)
68	{
69	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
70
71	if (key_len < 3)
72	return -EINVAL;
73
74	key_len -= 3;
75
76	memcpy(nx_ctx->priv.ccm.nonce, in_key + key_len, 3);
77
78	return ccm_aes_nx_set_key(tfm, in_key, key_len);
79	}
80
81	static int ccm_aes_nx_setauthsize(struct crypto_aead *tfm,
82	unsigned int authsize)
83	{
84	switch (authsize) {
85	case 4:
86	case 6:
87	case 8:
88	case 10:
89	case 12:
90	case 14:
91	case 16:
92	break;
93	default:
94	return -EINVAL;
95	}
96
97	crypto_aead_crt(tfm)->authsize = authsize;
98
99	return 0;
100	}
101
102	static int ccm4309_aes_nx_setauthsize(struct crypto_aead *tfm,
103	unsigned int authsize)
104	{
105	switch (authsize) {
106	case 8:
107	case 12:
108	case 16:
109	break;
110	default:
111	return -EINVAL;
112	}
113
114	crypto_aead_crt(tfm)->authsize = authsize;
115
116	return 0;
117	}
118
119	/* taken from crypto/ccm.c */
120	static int set_msg_len(u8 *block, unsigned int msglen, int csize)
121	{
122	__be32 data;
123
124	memset(block, 0, csize);
125	block += csize;
126
127	if (csize >= 4)
128	csize = 4;
129	else if (msglen > (unsigned int)(1 << (8 * csize)))
130	return -EOVERFLOW;
131
132	data = cpu_to_be32(msglen);
133	memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
134
135	return 0;
136	}
137
138	/* taken from crypto/ccm.c */
139	static inline int crypto_ccm_check_iv(const u8 *iv)
140	{
141	/* 2 <= L <= 8, so 1 <= L' <= 7. */
142	if (1 > iv[0] \|\| iv[0] > 7)
143	return -EINVAL;
144
145	return 0;
146	}
147
148	/* based on code from crypto/ccm.c */
149	static int generate_b0(u8 *iv, unsigned int assoclen, unsigned int authsize,
150	unsigned int cryptlen, u8 *b0)
151	{
152	unsigned int l, lp, m = authsize;
153	int rc;
154
155	memcpy(b0, iv, 16);
156
157	lp = b0[0];
158	l = lp + 1;
159
160	/* set m, bits 3-5 */
161	b0 \|= (8 ((m - 2) / 2));
162
163	/* set adata, bit 6, if associated data is used */
164	if (assoclen)
165	*b0 \|= 64;
166
167	rc = set_msg_len(b0 + 16 - l, cryptlen, l);
168
169	return rc;
170	}
171
172	static int generate_pat(u8 *iv,
173	struct aead_request *req,
174	struct nx_crypto_ctx *nx_ctx,
175	unsigned int authsize,
176	unsigned int nbytes,
177	u8 *out)
178	{
179	struct nx_sg *nx_insg = nx_ctx->in_sg;
180	struct nx_sg *nx_outsg = nx_ctx->out_sg;
181	unsigned int iauth_len = 0;
182	struct vio_pfo_op *op = NULL;
183	u8 tmp[16], b1 = NULL, b0 = NULL, *result = NULL;
184	int rc;
185
186	/* zero the ctr value */
187	memset(iv + 15 - iv[0], 0, iv[0] + 1);
188
189	if (!req->assoclen) {
190	b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
191	} else if (req->assoclen <= 14) {
192	/* if associated data is 14 bytes or less, we do 1 GCM
193	* operation on 2 AES blocks, B0 (stored in the csbcpb) and B1,
194	* which is fed in through the source buffers here */
195	b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
196	b1 = nx_ctx->priv.ccm.iauth_tag;
197	iauth_len = req->assoclen;
198
199	nx_insg = nx_build_sg_list(nx_insg, b1, 16, nx_ctx->ap->sglen);
200	nx_outsg = nx_build_sg_list(nx_outsg, tmp, 16,
201	nx_ctx->ap->sglen);
202
203	/* inlen should be negative, indicating to phyp that its a
204	* pointer to an sg list */
205	nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
206	sizeof(struct nx_sg);
207	nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) *
208	sizeof(struct nx_sg);
209
210	NX_CPB_FDM(nx_ctx->csbcpb) \|= NX_FDM_ENDE_ENCRYPT;
211	NX_CPB_FDM(nx_ctx->csbcpb) \|= NX_FDM_INTERMEDIATE;
212
213	op = &nx_ctx->op;
214	result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
215	} else if (req->assoclen <= 65280) {
216	/* if associated data is less than (2^16 - 2^8), we construct
217	* B1 differently and feed in the associated data to a CCA
218	* operation */
219	b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
220	b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
221	iauth_len = 14;
222
223	/* remaining assoc data must have scatterlist built for it */
224	nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen,
225	req->assoc, iauth_len,
226	req->assoclen - iauth_len);
227	nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
228	sizeof(struct nx_sg);
229
230	op = &nx_ctx->op_aead;
231	result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
232	} else {
233	/* if associated data is less than (2^32), we construct B1
234	* differently yet again and feed in the associated data to a
235	* CCA operation */
236	pr_err("associated data len is %u bytes (returning -EINVAL)\n",
237	req->assoclen);
238	rc = -EINVAL;
239	}
240
241	rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
242	if (rc)
243	goto done;
244
245	if (b1) {
246	memset(b1, 0, 16);
247	(u16 )b1 = (u16)req->assoclen;
248
249	scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
250	iauth_len, SCATTERWALK_FROM_SG);
251
252	rc = nx_hcall_sync(nx_ctx, op,
253	req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
254	if (rc)
255	goto done;
256
257	atomic_inc(&(nx_ctx->stats->aes_ops));
258	atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
259
260	memcpy(out, result, AES_BLOCK_SIZE);
261	}
262	done:
263	return rc;
264	}
265
266	static int ccm_nx_decrypt(struct aead_request *req,
267	struct blkcipher_desc *desc)
268	{
269	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
270	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
271	unsigned int nbytes = req->cryptlen;
272	unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
273	struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
274	int rc = -1;
275
276	if (nbytes > nx_ctx->ap->databytelen)
277	return -EINVAL;
278
279	nbytes -= authsize;
280
281	/* copy out the auth tag to compare with later */
282	scatterwalk_map_and_copy(priv->oauth_tag,
283	req->src, nbytes, authsize,
284	SCATTERWALK_FROM_SG);
285
286	rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
287	csbcpb->cpb.aes_ccm.in_pat_or_b0);
288	if (rc)
289	goto out;
290
291	rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
292	csbcpb->cpb.aes_ccm.iv_or_ctr);
293	if (rc)
294	goto out;
295
296	NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
297	NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_INTERMEDIATE;
298
299	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
300	req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
301	if (rc)
302	goto out;
303
304	atomic_inc(&(nx_ctx->stats->aes_ops));
305	atomic64_add(csbcpb->csb.processed_byte_count,
306	&(nx_ctx->stats->aes_bytes));
307
308	rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
309	authsize) ? -EBADMSG : 0;
310	out:
311	return rc;
312	}
313
314	static int ccm_nx_encrypt(struct aead_request *req,
315	struct blkcipher_desc *desc)
316	{
317	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
318	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
319	unsigned int nbytes = req->cryptlen;
320	unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
321	int rc = -1;
322
323	if (nbytes > nx_ctx->ap->databytelen)
324	return -EINVAL;
325
326	rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
327	csbcpb->cpb.aes_ccm.in_pat_or_b0);
328	if (rc)
329	goto out;
330
331	rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
332	csbcpb->cpb.aes_ccm.iv_or_ctr);
333	if (rc)
334	goto out;
335
336	NX_CPB_FDM(csbcpb) \|= NX_FDM_ENDE_ENCRYPT;
337	NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
338
339	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
340	req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
341	if (rc)
342	goto out;
343
344	atomic_inc(&(nx_ctx->stats->aes_ops));
345	atomic64_add(csbcpb->csb.processed_byte_count,
346	&(nx_ctx->stats->aes_bytes));
347
348	/* copy out the auth tag */
349	scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
350	req->dst, nbytes, authsize,
351	SCATTERWALK_TO_SG);
352	out:
353	return rc;
354	}
355
356	static int ccm4309_aes_nx_encrypt(struct aead_request *req)
357	{
358	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
359	struct blkcipher_desc desc;
360	u8 *iv = nx_ctx->priv.ccm.iv;
361
362	iv[0] = 3;
363	memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
364	memcpy(iv + 4, req->iv, 8);
365
366	desc.info = iv;
367	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
368
369	return ccm_nx_encrypt(req, &desc);
370	}
371
372	static int ccm_aes_nx_encrypt(struct aead_request *req)
373	{
374	struct blkcipher_desc desc;
375	int rc;
376
377	desc.info = req->iv;
378	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
379
380	rc = crypto_ccm_check_iv(desc.info);
381	if (rc)
382	return rc;
383
384	return ccm_nx_encrypt(req, &desc);
385	}
386
387	static int ccm4309_aes_nx_decrypt(struct aead_request *req)
388	{
389	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
390	struct blkcipher_desc desc;
391	u8 *iv = nx_ctx->priv.ccm.iv;
392
393	iv[0] = 3;
394	memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
395	memcpy(iv + 4, req->iv, 8);
396
397	desc.info = iv;
398	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
399
400	return ccm_nx_decrypt(req, &desc);
401	}
402
403	static int ccm_aes_nx_decrypt(struct aead_request *req)
404	{
405	struct blkcipher_desc desc;
406	int rc;
407
408	desc.info = req->iv;
409	desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
410
411	rc = crypto_ccm_check_iv(desc.info);
412	if (rc)
413	return rc;
414
415	return ccm_nx_decrypt(req, &desc);
416	}
417
418	/* tell the block cipher walk routines that this is a stream cipher by
419	* setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
420	* during encrypt/decrypt doesn't solve this problem, because it calls
421	* blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
422	* but instead uses this tfm->blocksize. */
423	struct crypto_alg nx_ccm_aes_alg = {
424	.cra_name = "ccm(aes)",
425	.cra_driver_name = "ccm-aes-nx",
426	.cra_priority = 300,
427	.cra_flags = CRYPTO_ALG_TYPE_AEAD \|
428	CRYPTO_ALG_NEED_FALLBACK,
429	.cra_blocksize = 1,
430	.cra_ctxsize = sizeof(struct nx_crypto_ctx),
431	.cra_type = &crypto_aead_type,
432	.cra_module = THIS_MODULE,
a00bd6e6 KY	433	.cra_init = nx_crypto_ctx_aes_ccm_init,
	434	.cra_exit = nx_crypto_ctx_exit,
	435	.cra_aead = {
	436	.ivsize = AES_BLOCK_SIZE,
	437	.maxauthsize = AES_BLOCK_SIZE,
	438	.setkey = ccm_aes_nx_set_key,
	439	.setauthsize = ccm_aes_nx_setauthsize,
	440	.encrypt = ccm_aes_nx_encrypt,
	441	.decrypt = ccm_aes_nx_decrypt,
	442	}
	443	};
	444
	445	struct crypto_alg nx_ccm4309_aes_alg = {
	446	.cra_name = "rfc4309(ccm(aes))",
	447	.cra_driver_name = "rfc4309-ccm-aes-nx",
	448	.cra_priority = 300,
	449	.cra_flags = CRYPTO_ALG_TYPE_AEAD \|
	450	CRYPTO_ALG_NEED_FALLBACK,
	451	.cra_blocksize = 1,
	452	.cra_ctxsize = sizeof(struct nx_crypto_ctx),
	453	.cra_type = &crypto_nivaead_type,
	454	.cra_module = THIS_MODULE,
a00bd6e6 KY	455	.cra_init = nx_crypto_ctx_aes_ccm_init,
	456	.cra_exit = nx_crypto_ctx_exit,
	457	.cra_aead = {
	458	.ivsize = 8,
	459	.maxauthsize = AES_BLOCK_SIZE,
	460	.setkey = ccm4309_aes_nx_set_key,
	461	.setauthsize = ccm4309_aes_nx_setauthsize,
	462	.encrypt = ccm4309_aes_nx_encrypt,
	463	.decrypt = ccm4309_aes_nx_decrypt,
	464	.geniv = "seqiv",
	465	}
	466	};