blob: ce330278ef8a4d66449dba92d3b76aa6f620287b [file] [log] [blame]
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <crypto/aes.h>
#include <crypto/skcipher.h>
#include <crypto/ctr.h>
#include <crypto/des.h>
#include <crypto/xts.h>
#include "nitrox_dev.h"
#include "nitrox_common.h"
#include "nitrox_req.h"
#define PRIO 4001
struct nitrox_cipher {
const char *name;
enum flexi_cipher value;
};
/**
* supported cipher list
*/
static const struct nitrox_cipher flexi_cipher_table[] = {
{ "null", CIPHER_NULL },
{ "cbc(des3_ede)", CIPHER_3DES_CBC },
{ "ecb(des3_ede)", CIPHER_3DES_ECB },
{ "cbc(aes)", CIPHER_AES_CBC },
{ "ecb(aes)", CIPHER_AES_ECB },
{ "cfb(aes)", CIPHER_AES_CFB },
{ "rfc3686(ctr(aes))", CIPHER_AES_CTR },
{ "xts(aes)", CIPHER_AES_XTS },
{ "cts(cbc(aes))", CIPHER_AES_CBC_CTS },
{ NULL, CIPHER_INVALID }
};
static enum flexi_cipher flexi_cipher_type(const char *name)
{
const struct nitrox_cipher *cipher = flexi_cipher_table;
while (cipher->name) {
if (!strcmp(cipher->name, name))
break;
cipher++;
}
return cipher->value;
}
static int flexi_aes_keylen(int keylen)
{
int aes_keylen;
switch (keylen) {
case AES_KEYSIZE_128:
aes_keylen = 1;
break;
case AES_KEYSIZE_192:
aes_keylen = 2;
break;
case AES_KEYSIZE_256:
aes_keylen = 3;
break;
default:
aes_keylen = -EINVAL;
break;
}
return aes_keylen;
}
static int nitrox_skcipher_init(struct crypto_skcipher *tfm)
{
struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
void *fctx;
/* get the first device */
nctx->ndev = nitrox_get_first_device();
if (!nctx->ndev)
return -ENODEV;
/* allocate nitrox crypto context */
fctx = crypto_alloc_context(nctx->ndev);
if (!fctx) {
nitrox_put_device(nctx->ndev);
return -ENOMEM;
}
nctx->u.ctx_handle = (uintptr_t)fctx;
crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(tfm) +
sizeof(struct nitrox_kcrypt_request));
return 0;
}
static void nitrox_skcipher_exit(struct crypto_skcipher *tfm)
{
struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
/* free the nitrox crypto context */
if (nctx->u.ctx_handle) {
struct flexi_crypto_context *fctx = nctx->u.fctx;
memset(&fctx->crypto, 0, sizeof(struct crypto_keys));
memset(&fctx->auth, 0, sizeof(struct auth_keys));
crypto_free_context((void *)fctx);
}
nitrox_put_device(nctx->ndev);
nctx->u.ctx_handle = 0;
nctx->ndev = NULL;
}
static inline int nitrox_skcipher_setkey(struct crypto_skcipher *cipher,
int aes_keylen, const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
struct flexi_crypto_context *fctx;
enum flexi_cipher cipher_type;
const char *name;
name = crypto_tfm_alg_name(tfm);
cipher_type = flexi_cipher_type(name);
if (unlikely(cipher_type == CIPHER_INVALID)) {
pr_err("unsupported cipher: %s\n", name);
return -EINVAL;
}
/* fill crypto context */
fctx = nctx->u.fctx;
fctx->flags = 0;
fctx->w0.cipher_type = cipher_type;
fctx->w0.aes_keylen = aes_keylen;
fctx->w0.iv_source = IV_FROM_DPTR;
fctx->flags = cpu_to_be64(*(u64 *)&fctx->w0);
/* copy the key to context */
memcpy(fctx->crypto.u.key, key, keylen);
return 0;
}
static int nitrox_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
unsigned int keylen)
{
int aes_keylen;
aes_keylen = flexi_aes_keylen(keylen);
if (aes_keylen < 0) {
crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
}
static void nitrox_skcipher_callback(struct skcipher_request *skreq,
int err)
{
if (err) {
pr_err_ratelimited("request failed status 0x%0x\n", err);
err = -EINVAL;
}
skcipher_request_complete(skreq, err);
}
static int nitrox_skcipher_crypt(struct skcipher_request *skreq, bool enc)
{
struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
int ivsize = crypto_skcipher_ivsize(cipher);
struct se_crypto_request *creq;
creq = &nkreq->creq;
creq->flags = skreq->base.flags;
creq->gfp = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
GFP_KERNEL : GFP_ATOMIC;
/* fill the request */
creq->ctrl.value = 0;
creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
creq->ctrl.s.arg = (enc ? ENCRYPT : DECRYPT);
/* param0: length of the data to be encrypted */
creq->gph.param0 = cpu_to_be16(skreq->cryptlen);
creq->gph.param1 = 0;
/* param2: encryption data offset */
creq->gph.param2 = cpu_to_be16(ivsize);
creq->gph.param3 = 0;
creq->ctx_handle = nctx->u.ctx_handle;
creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
/* copy the iv */
memcpy(creq->iv, skreq->iv, ivsize);
creq->ivsize = ivsize;
creq->src = skreq->src;
creq->dst = skreq->dst;
nkreq->nctx = nctx;
nkreq->skreq = skreq;
/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq,
nitrox_skcipher_callback, skreq);
}
static int nitrox_aes_encrypt(struct skcipher_request *skreq)
{
return nitrox_skcipher_crypt(skreq, true);
}
static int nitrox_aes_decrypt(struct skcipher_request *skreq)
{
return nitrox_skcipher_crypt(skreq, false);
}
static int nitrox_3des_setkey(struct crypto_skcipher *cipher,
const u8 *key, unsigned int keylen)
{
if (keylen != DES3_EDE_KEY_SIZE) {
crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
return nitrox_skcipher_setkey(cipher, 0, key, keylen);
}
static int nitrox_3des_encrypt(struct skcipher_request *skreq)
{
return nitrox_skcipher_crypt(skreq, true);
}
static int nitrox_3des_decrypt(struct skcipher_request *skreq)
{
return nitrox_skcipher_crypt(skreq, false);
}
static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
const u8 *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
struct flexi_crypto_context *fctx;
int aes_keylen, ret;
ret = xts_check_key(tfm, key, keylen);
if (ret)
return ret;
keylen /= 2;
aes_keylen = flexi_aes_keylen(keylen);
if (aes_keylen < 0) {
crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
fctx = nctx->u.fctx;
/* copy KEY2 */
memcpy(fctx->auth.u.key2, (key + keylen), keylen);
return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
}
static int nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher *cipher,
const u8 *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
struct flexi_crypto_context *fctx;
int aes_keylen;
if (keylen < CTR_RFC3686_NONCE_SIZE)
return -EINVAL;
fctx = nctx->u.fctx;
memcpy(fctx->crypto.iv, key + (keylen - CTR_RFC3686_NONCE_SIZE),
CTR_RFC3686_NONCE_SIZE);
keylen -= CTR_RFC3686_NONCE_SIZE;
aes_keylen = flexi_aes_keylen(keylen);
if (aes_keylen < 0) {
crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
}
static struct skcipher_alg nitrox_skciphers[] = { {
.base = {
.cra_name = "cbc(aes)",
.cra_driver_name = "n5_cbc(aes)",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = nitrox_aes_setkey,
.encrypt = nitrox_aes_encrypt,
.decrypt = nitrox_aes_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}, {
.base = {
.cra_name = "ecb(aes)",
.cra_driver_name = "n5_ecb(aes)",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = nitrox_aes_setkey,
.encrypt = nitrox_aes_encrypt,
.decrypt = nitrox_aes_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}, {
.base = {
.cra_name = "cfb(aes)",
.cra_driver_name = "n5_cfb(aes)",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = nitrox_aes_setkey,
.encrypt = nitrox_aes_encrypt,
.decrypt = nitrox_aes_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}, {
.base = {
.cra_name = "xts(aes)",
.cra_driver_name = "n5_xts(aes)",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.min_keysize = 2 * AES_MIN_KEY_SIZE,
.max_keysize = 2 * AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = nitrox_aes_xts_setkey,
.encrypt = nitrox_aes_encrypt,
.decrypt = nitrox_aes_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}, {
.base = {
.cra_name = "rfc3686(ctr(aes))",
.cra_driver_name = "n5_rfc3686(ctr(aes))",
.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,
},
.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
.ivsize = CTR_RFC3686_IV_SIZE,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
.setkey = nitrox_aes_ctr_rfc3686_setkey,
.encrypt = nitrox_aes_encrypt,
.decrypt = nitrox_aes_decrypt,
}, {
.base = {
.cra_name = "cts(cbc(aes))",
.cra_driver_name = "n5_cts(cbc(aes))",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
},
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = nitrox_aes_setkey,
.encrypt = nitrox_aes_encrypt,
.decrypt = nitrox_aes_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}, {
.base = {
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "n5_cbc(des3_ede)",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
.setkey = nitrox_3des_setkey,
.encrypt = nitrox_3des_encrypt,
.decrypt = nitrox_3des_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}, {
.base = {
.cra_name = "ecb(des3_ede)",
.cra_driver_name = "n5_ecb(des3_ede)",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
.setkey = nitrox_3des_setkey,
.encrypt = nitrox_3des_encrypt,
.decrypt = nitrox_3des_decrypt,
.init = nitrox_skcipher_init,
.exit = nitrox_skcipher_exit,
}
};
int nitrox_crypto_register(void)
{
return crypto_register_skciphers(nitrox_skciphers,
ARRAY_SIZE(nitrox_skciphers));
}
void nitrox_crypto_unregister(void)
{
crypto_unregister_skciphers(nitrox_skciphers,
ARRAY_SIZE(nitrox_skciphers));
}