blob: 6f80cc3b5c84b3726758de786ced9b2446dea2e3 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/printk.h>
#include <linux/crypto.h>
#include <linux/rtnetlink.h>
#include <crypto/aead.h>
#include <crypto/authenc.h>
#include <crypto/des.h>
#include <crypto/sha.h>
#include <crypto/internal/aead.h>
#include <crypto/scatterwalk.h>
#include <crypto/gcm.h>
#include "nitrox_dev.h"
#include "nitrox_common.h"
#include "nitrox_req.h"
#define GCM_AES_SALT_SIZE 4
union gph_p3 {
struct {
#ifdef __BIG_ENDIAN_BITFIELD
u16 iv_offset : 8;
u16 auth_offset : 8;
#else
u16 auth_offset : 8;
u16 iv_offset : 8;
#endif
};
u16 param;
};
static int nitrox_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
int aes_keylen;
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct flexi_crypto_context *fctx;
union fc_ctx_flags flags;
aes_keylen = flexi_aes_keylen(keylen);
if (aes_keylen < 0) {
crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
/* fill crypto context */
fctx = nctx->u.fctx;
flags.f = be64_to_cpu(fctx->flags.f);
flags.w0.aes_keylen = aes_keylen;
fctx->flags.f = cpu_to_be64(flags.f);
/* copy enc key to context */
memset(&fctx->crypto, 0, sizeof(fctx->crypto));
memcpy(fctx->crypto.u.key, key, keylen);
return 0;
}
static int nitrox_aead_setauthsize(struct crypto_aead *aead,
unsigned int authsize)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct flexi_crypto_context *fctx = nctx->u.fctx;
union fc_ctx_flags flags;
flags.f = be64_to_cpu(fctx->flags.f);
flags.w0.mac_len = authsize;
fctx->flags.f = cpu_to_be64(flags.f);
aead->authsize = authsize;
return 0;
}
static int nitrox_aes_gcm_setauthsize(struct crypto_aead *aead,
unsigned int authsize)
{
switch (authsize) {
case 4:
case 8:
case 12:
case 13:
case 14:
case 15:
case 16:
break;
default:
return -EINVAL;
}
return nitrox_aead_setauthsize(aead, authsize);
}
static int alloc_src_sglist(struct nitrox_kcrypt_request *nkreq,
struct scatterlist *src, char *iv, int ivsize,
int buflen)
{
int nents = sg_nents_for_len(src, buflen);
int ret;
if (nents < 0)
return nents;
/* IV entry */
nents += 1;
/* Allocate buffer to hold IV and input scatterlist array */
ret = alloc_src_req_buf(nkreq, nents, ivsize);
if (ret)
return ret;
nitrox_creq_copy_iv(nkreq->src, iv, ivsize);
nitrox_creq_set_src_sg(nkreq, nents, ivsize, src, buflen);
return 0;
}
static int alloc_dst_sglist(struct nitrox_kcrypt_request *nkreq,
struct scatterlist *dst, int ivsize, int buflen)
{
int nents = sg_nents_for_len(dst, buflen);
int ret;
if (nents < 0)
return nents;
/* IV, ORH, COMPLETION entries */
nents += 3;
/* Allocate buffer to hold ORH, COMPLETION and output scatterlist
* array
*/
ret = alloc_dst_req_buf(nkreq, nents);
if (ret)
return ret;
nitrox_creq_set_orh(nkreq);
nitrox_creq_set_comp(nkreq);
nitrox_creq_set_dst_sg(nkreq, nents, ivsize, dst, buflen);
return 0;
}
static void free_src_sglist(struct nitrox_kcrypt_request *nkreq)
{
kfree(nkreq->src);
}
static void free_dst_sglist(struct nitrox_kcrypt_request *nkreq)
{
kfree(nkreq->dst);
}
static int nitrox_set_creq(struct nitrox_aead_rctx *rctx)
{
struct se_crypto_request *creq = &rctx->nkreq.creq;
union gph_p3 param3;
int ret;
creq->flags = rctx->flags;
creq->gfp = (rctx->flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL :
GFP_ATOMIC;
creq->ctrl.value = 0;
creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
creq->ctrl.s.arg = rctx->ctrl_arg;
creq->gph.param0 = cpu_to_be16(rctx->cryptlen);
creq->gph.param1 = cpu_to_be16(rctx->cryptlen + rctx->assoclen);
creq->gph.param2 = cpu_to_be16(rctx->ivsize + rctx->assoclen);
param3.iv_offset = 0;
param3.auth_offset = rctx->ivsize;
creq->gph.param3 = cpu_to_be16(param3.param);
creq->ctx_handle = rctx->ctx_handle;
creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
ret = alloc_src_sglist(&rctx->nkreq, rctx->src, rctx->iv, rctx->ivsize,
rctx->srclen);
if (ret)
return ret;
ret = alloc_dst_sglist(&rctx->nkreq, rctx->dst, rctx->ivsize,
rctx->dstlen);
if (ret) {
free_src_sglist(&rctx->nkreq);
return ret;
}
return 0;
}
static void nitrox_aead_callback(void *arg, int err)
{
struct aead_request *areq = arg;
struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
free_src_sglist(&rctx->nkreq);
free_dst_sglist(&rctx->nkreq);
if (err) {
pr_err_ratelimited("request failed status 0x%0x\n", err);
err = -EINVAL;
}
areq->base.complete(&areq->base, err);
}
static inline bool nitrox_aes_gcm_assoclen_supported(unsigned int assoclen)
{
if (assoclen <= 512)
return true;
return false;
}
static int nitrox_aes_gcm_enc(struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
struct se_crypto_request *creq = &rctx->nkreq.creq;
struct flexi_crypto_context *fctx = nctx->u.fctx;
int ret;
if (!nitrox_aes_gcm_assoclen_supported(areq->assoclen))
return -EINVAL;
memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
rctx->cryptlen = areq->cryptlen;
rctx->assoclen = areq->assoclen;
rctx->srclen = areq->assoclen + areq->cryptlen;
rctx->dstlen = rctx->srclen + aead->authsize;
rctx->iv = &areq->iv[GCM_AES_SALT_SIZE];
rctx->ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
rctx->flags = areq->base.flags;
rctx->ctx_handle = nctx->u.ctx_handle;
rctx->src = areq->src;
rctx->dst = areq->dst;
rctx->ctrl_arg = ENCRYPT;
ret = nitrox_set_creq(rctx);
if (ret)
return ret;
/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
areq);
}
static int nitrox_aes_gcm_dec(struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
struct se_crypto_request *creq = &rctx->nkreq.creq;
struct flexi_crypto_context *fctx = nctx->u.fctx;
int ret;
if (!nitrox_aes_gcm_assoclen_supported(areq->assoclen))
return -EINVAL;
memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
rctx->cryptlen = areq->cryptlen - aead->authsize;
rctx->assoclen = areq->assoclen;
rctx->srclen = areq->cryptlen + areq->assoclen;
rctx->dstlen = rctx->srclen - aead->authsize;
rctx->iv = &areq->iv[GCM_AES_SALT_SIZE];
rctx->ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
rctx->flags = areq->base.flags;
rctx->ctx_handle = nctx->u.ctx_handle;
rctx->src = areq->src;
rctx->dst = areq->dst;
rctx->ctrl_arg = DECRYPT;
ret = nitrox_set_creq(rctx);
if (ret)
return ret;
/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
areq);
}
static int nitrox_aead_init(struct crypto_aead *aead)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct crypto_ctx_hdr *chdr;
/* get the first device */
nctx->ndev = nitrox_get_first_device();
if (!nctx->ndev)
return -ENODEV;
/* allocate nitrox crypto context */
chdr = crypto_alloc_context(nctx->ndev);
if (!chdr) {
nitrox_put_device(nctx->ndev);
return -ENOMEM;
}
nctx->chdr = chdr;
nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
sizeof(struct ctx_hdr));
nctx->u.fctx->flags.f = 0;
return 0;
}
static int nitrox_gcm_common_init(struct crypto_aead *aead)
{
int ret;
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
union fc_ctx_flags *flags;
ret = nitrox_aead_init(aead);
if (ret)
return ret;
flags = &nctx->u.fctx->flags;
flags->w0.cipher_type = CIPHER_AES_GCM;
flags->w0.hash_type = AUTH_NULL;
flags->w0.iv_source = IV_FROM_DPTR;
/* ask microcode to calculate ipad/opad */
flags->w0.auth_input_type = 1;
flags->f = be64_to_cpu(flags->f);
return 0;
}
static int nitrox_aes_gcm_init(struct crypto_aead *aead)
{
int ret;
ret = nitrox_gcm_common_init(aead);
if (ret)
return ret;
crypto_aead_set_reqsize(aead,
sizeof(struct aead_request) +
sizeof(struct nitrox_aead_rctx));
return 0;
}
static void nitrox_aead_exit(struct crypto_aead *aead)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
/* free the nitrox crypto context */
if (nctx->u.ctx_handle) {
struct flexi_crypto_context *fctx = nctx->u.fctx;
memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
crypto_free_context((void *)nctx->chdr);
}
nitrox_put_device(nctx->ndev);
nctx->u.ctx_handle = 0;
nctx->ndev = NULL;
}
static int nitrox_rfc4106_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct flexi_crypto_context *fctx = nctx->u.fctx;
int ret;
if (keylen < GCM_AES_SALT_SIZE)
return -EINVAL;
keylen -= GCM_AES_SALT_SIZE;
ret = nitrox_aes_gcm_setkey(aead, key, keylen);
if (ret)
return ret;
memcpy(fctx->crypto.iv, key + keylen, GCM_AES_SALT_SIZE);
return 0;
}
static int nitrox_rfc4106_setauthsize(struct crypto_aead *aead,
unsigned int authsize)
{
switch (authsize) {
case 8:
case 12:
case 16:
break;
default:
return -EINVAL;
}
return nitrox_aead_setauthsize(aead, authsize);
}
static int nitrox_rfc4106_set_aead_rctx_sglist(struct aead_request *areq)
{
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx(areq);
struct nitrox_aead_rctx *aead_rctx = &rctx->base;
unsigned int assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
struct scatterlist *sg;
if (areq->assoclen != 16 && areq->assoclen != 20)
return -EINVAL;
scatterwalk_map_and_copy(rctx->assoc, areq->src, 0, assoclen, 0);
sg_init_table(rctx->src, 3);
sg_set_buf(rctx->src, rctx->assoc, assoclen);
sg = scatterwalk_ffwd(rctx->src + 1, areq->src, areq->assoclen);
if (sg != rctx->src + 1)
sg_chain(rctx->src, 2, sg);
if (areq->src != areq->dst) {
sg_init_table(rctx->dst, 3);
sg_set_buf(rctx->dst, rctx->assoc, assoclen);
sg = scatterwalk_ffwd(rctx->dst + 1, areq->dst, areq->assoclen);
if (sg != rctx->dst + 1)
sg_chain(rctx->dst, 2, sg);
}
aead_rctx->src = rctx->src;
aead_rctx->dst = (areq->src == areq->dst) ? rctx->src : rctx->dst;
return 0;
}
static void nitrox_rfc4106_callback(void *arg, int err)
{
struct aead_request *areq = arg;
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx(areq);
struct nitrox_kcrypt_request *nkreq = &rctx->base.nkreq;
free_src_sglist(nkreq);
free_dst_sglist(nkreq);
if (err) {
pr_err_ratelimited("request failed status 0x%0x\n", err);
err = -EINVAL;
}
areq->base.complete(&areq->base, err);
}
static int nitrox_rfc4106_enc(struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx(areq);
struct nitrox_aead_rctx *aead_rctx = &rctx->base;
struct se_crypto_request *creq = &aead_rctx->nkreq.creq;
int ret;
aead_rctx->cryptlen = areq->cryptlen;
aead_rctx->assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
aead_rctx->srclen = aead_rctx->assoclen + aead_rctx->cryptlen;
aead_rctx->dstlen = aead_rctx->srclen + aead->authsize;
aead_rctx->iv = areq->iv;
aead_rctx->ivsize = GCM_RFC4106_IV_SIZE;
aead_rctx->flags = areq->base.flags;
aead_rctx->ctx_handle = nctx->u.ctx_handle;
aead_rctx->ctrl_arg = ENCRYPT;
ret = nitrox_rfc4106_set_aead_rctx_sglist(areq);
if (ret)
return ret;
ret = nitrox_set_creq(aead_rctx);
if (ret)
return ret;
/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq,
nitrox_rfc4106_callback, areq);
}
static int nitrox_rfc4106_dec(struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx(areq);
struct nitrox_aead_rctx *aead_rctx = &rctx->base;
struct se_crypto_request *creq = &aead_rctx->nkreq.creq;
int ret;
aead_rctx->cryptlen = areq->cryptlen - aead->authsize;
aead_rctx->assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
aead_rctx->srclen =
areq->cryptlen - GCM_RFC4106_IV_SIZE + areq->assoclen;
aead_rctx->dstlen = aead_rctx->srclen - aead->authsize;
aead_rctx->iv = areq->iv;
aead_rctx->ivsize = GCM_RFC4106_IV_SIZE;
aead_rctx->flags = areq->base.flags;
aead_rctx->ctx_handle = nctx->u.ctx_handle;
aead_rctx->ctrl_arg = DECRYPT;
ret = nitrox_rfc4106_set_aead_rctx_sglist(areq);
if (ret)
return ret;
ret = nitrox_set_creq(aead_rctx);
if (ret)
return ret;
/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq,
nitrox_rfc4106_callback, areq);
}
static int nitrox_rfc4106_init(struct crypto_aead *aead)
{
int ret;
ret = nitrox_gcm_common_init(aead);
if (ret)
return ret;
crypto_aead_set_reqsize(aead, sizeof(struct aead_request) +
sizeof(struct nitrox_rfc4106_rctx));
return 0;
}
static struct aead_alg nitrox_aeads[] = { {
.base = {
.cra_name = "gcm(aes)",
.cra_driver_name = "n5_aes_gcm",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.setkey = nitrox_aes_gcm_setkey,
.setauthsize = nitrox_aes_gcm_setauthsize,
.encrypt = nitrox_aes_gcm_enc,
.decrypt = nitrox_aes_gcm_dec,
.init = nitrox_aes_gcm_init,
.exit = nitrox_aead_exit,
.ivsize = GCM_AES_IV_SIZE,
.maxauthsize = AES_BLOCK_SIZE,
}, {
.base = {
.cra_name = "rfc4106(gcm(aes))",
.cra_driver_name = "n5_rfc4106",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.setkey = nitrox_rfc4106_setkey,
.setauthsize = nitrox_rfc4106_setauthsize,
.encrypt = nitrox_rfc4106_enc,
.decrypt = nitrox_rfc4106_dec,
.init = nitrox_rfc4106_init,
.exit = nitrox_aead_exit,
.ivsize = GCM_RFC4106_IV_SIZE,
.maxauthsize = AES_BLOCK_SIZE,
} };
int nitrox_register_aeads(void)
{
return crypto_register_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
}
void nitrox_unregister_aeads(void)
{
crypto_unregister_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
}