// SPDX-License-Identifier: GPL-2.0-only
/* Glue code for DES encryption optimized for sparc64 crypto opcodes.
*
* Copyright (C) 2012 David S. Miller <[email protected]>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/algapi.h>
#include <crypto/internal/des.h>
#include <crypto/internal/skcipher.h>
#include <asm/fpumacro.h>
#include <asm/pstate.h>
#include <asm/elf.h>
#include "opcodes.h"
struct des_sparc64_ctx {
u64 encrypt_expkey[DES_EXPKEY_WORDS / 2];
u64 decrypt_expkey[DES_EXPKEY_WORDS / 2];
};
struct des3_ede_sparc64_ctx {
u64 encrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
u64 decrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
};
static void encrypt_to_decrypt(u64 *d, const u64 *e)
{
const u64 *s = e + (DES_EXPKEY_WORDS / 2) - 1;
int i;
for (i = 0; i < DES_EXPKEY_WORDS / 2; i++)
*d++ = *s--;
}
extern void des_sparc64_key_expand(const u32 *input_key, u64 *key);
static int des_set_key(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct des_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
int err;
/* Even though we have special instructions for key expansion,
* we call des_verify_key() so that we don't have to write our own
* weak key detection code.
*/
err = crypto_des_verify_key(tfm, key);
if (err)
return err;
des_sparc64_key_expand((const u32 *) key, &dctx->encrypt_expkey[0]);
encrypt_to_decrypt(&dctx->decrypt_expkey[0], &dctx->encrypt_expkey[0]);
return 0;
}
static int des_set_key_skcipher(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
return des_set_key(crypto_skcipher_tfm(tfm), key, keylen);
}
extern void des_sparc64_crypt(const u64 *key, const u64 *input,
u64 *output);
static void sparc_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
const u64 *K = ctx->encrypt_expkey;
des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}
static void sparc_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
const u64 *K = ctx->decrypt_expkey;
des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}
extern void des_sparc64_load_keys(const u64 *key);
extern void des_sparc64_ecb_crypt(const u64 *input, u64 *output,
unsigned int len);
static int __ecb_crypt(struct skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct des_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, true);
if (err)
return err;
if (encrypt)
des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
else
des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
while ((nbytes = walk.nbytes) != 0) {
des_sparc64_ecb_crypt(walk.src.virt.addr, walk.dst.virt.addr,
round_down(nbytes, DES_BLOCK_SIZE));
err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
}
fprs_write(0);
return err;
}
static int ecb_encrypt(struct skcipher_request *req)
{
return __ecb_crypt(req, true);
}
static int ecb_decrypt(struct skcipher_request *req)
{
return __ecb_crypt(req, false);
}
extern void des_sparc64_cbc_encrypt(const u64 *input, u64 *output,
unsigned int len, u64 *iv);
extern void des_sparc64_cbc_decrypt(const u64 *input, u64 *output,
unsigned int len, u64 *iv);
static int __cbc_crypt(struct skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct des_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, true);
if (err)
return err;
if (encrypt)
des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
else
des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
while ((nbytes = walk.nbytes) != 0) {
if (encrypt)
des_sparc64_cbc_encrypt(walk.src.virt.addr,
walk.dst.virt.addr,
round_down(nbytes,
DES_BLOCK_SIZE),
walk.iv);
else
des_sparc64_cbc_decrypt(walk.src.virt.addr,
walk.dst.virt.addr,
round_down(nbytes,
DES_BLOCK_SIZE),
walk.iv);
err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
}
fprs_write(0);
return err;
}
static int cbc_encrypt(struct skcipher_request *req)
{
return __cbc_crypt(req, true);
}
static int cbc_decrypt(struct skcipher_request *req)
{
return __cbc_crypt(req, false);
}
static int des3_ede_set_key(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct des3_ede_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
u64 k1[DES_EXPKEY_WORDS / 2];
u64 k2[DES_EXPKEY_WORDS / 2];
u64 k3[DES_EXPKEY_WORDS / 2];
int err;
err = crypto_des3_ede_verify_key(tfm, key);
if (err)
return err;
des_sparc64_key_expand((const u32 *)key, k1);
key += DES_KEY_SIZE;
des_sparc64_key_expand((const u32 *)key, k2);
key += DES_KEY_SIZE;
des_sparc64_key_expand((const u32 *)key, k3);
memcpy(&dctx->encrypt_expkey[0], &k1[0], sizeof(k1));
encrypt_to_decrypt(&dctx->encrypt_expkey[DES_EXPKEY_WORDS / 2], &k2[0]);
memcpy(&dctx->encrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
&k3[0], sizeof(k3));
encrypt_to_decrypt(&dctx->decrypt_expkey[0], &k3[0]);
memcpy(&dctx->decrypt_expkey[DES_EXPKEY_WORDS / 2],
&k2[0], sizeof(k2));
encrypt_to_decrypt(&dctx->decrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
&k1[0]);
return 0;
}
static int des3_ede_set_key_skcipher(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
return des3_ede_set_key(crypto_skcipher_tfm(tfm), key, keylen);
}
extern void des3_ede_sparc64_crypt(const u64 *key, const u64 *input,
u64 *output);
static void sparc_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
const u64 *K = ctx->encrypt_expkey;
des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}
static void sparc_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
const u64 *K = ctx->decrypt_expkey;
des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}
extern void des3_ede_sparc64_load_keys(const u64 *key);
extern void des3_ede_sparc64_ecb_crypt(const u64 *expkey, const u64 *input,
u64 *output, unsigned int len);
static int __ecb3_crypt(struct skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct des3_ede_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
const u64 *K;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, true);
if (err)
return err;
if (encrypt)
K = &ctx->encrypt_expkey[0];
else
K = &ctx->decrypt_expkey[0];
des3_ede_sparc64_load_keys(K);
while ((nbytes = walk.nbytes) != 0) {
des3_ede_sparc64_ecb_crypt(K, walk.src.virt.addr,
walk.dst.virt.addr,
round_down(nbytes, DES_BLOCK_SIZE));
err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
}
fprs_write(0);
return err;
}
static int ecb3_encrypt(struct skcipher_request *req)
{
return __ecb3_crypt(req, true);
}
static int ecb3_decrypt(struct skcipher_request *req)
{
return __ecb3_crypt(req, false);
}
extern void des3_ede_sparc64_cbc_encrypt(const u64 *expkey, const u64 *input,
u64 *output, unsigned int len,
u64 *iv);
extern void des3_ede_sparc64_cbc_decrypt(const u64 *expkey, const u64 *input,
u64 *output, unsigned int len,
u64 *iv);
static int __cbc3_crypt(struct skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct des3_ede_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
const u64 *K;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, true);
if (err)
return err;
if (encrypt)
K = &ctx->encrypt_expkey[0];
else
K = &ctx->decrypt_expkey[0];
des3_ede_sparc64_load_keys(K);
while ((nbytes = walk.nbytes) != 0) {
if (encrypt)
des3_ede_sparc64_cbc_encrypt(K, walk.src.virt.addr,
walk.dst.virt.addr,
round_down(nbytes,
DES_BLOCK_SIZE),
walk.iv);
else
des3_ede_sparc64_cbc_decrypt(K, walk.src.virt.addr,
walk.dst.virt.addr,
round_down(nbytes,
DES_BLOCK_SIZE),
walk.iv);
err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
}
fprs_write(0);
return err;
}
static int cbc3_encrypt(struct skcipher_request *req)
{
return __cbc3_crypt(req, true);
}
static int cbc3_decrypt(struct skcipher_request *req)
{
return __cbc3_crypt(req, false);
}
static struct crypto_alg cipher_algs[] = {
{
.cra_name = "des",
.cra_driver_name = "des-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct des_sparc64_ctx),
.cra_alignmask = 7,
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey = des_set_key,
.cia_encrypt = sparc_des_encrypt,
.cia_decrypt = sparc_des_decrypt
}
}
}, {
.cra_name = "des3_ede",
.cra_driver_name = "des3_ede-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct des3_ede_sparc64_ctx),
.cra_alignmask = 7,
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = DES3_EDE_KEY_SIZE,
.cia_max_keysize = DES3_EDE_KEY_SIZE,
.cia_setkey = des3_ede_set_key,
.cia_encrypt = sparc_des3_ede_encrypt,
.cia_decrypt = sparc_des3_ede_decrypt
}
}
}
};
static struct skcipher_alg skcipher_algs[] = {
{
.base.cra_name = "ecb(des)",
.base.cra_driver_name = "ecb-des-sparc64",
.base.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct des_sparc64_ctx),
.base.cra_alignmask = 7,
.base.cra_module = THIS_MODULE,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.setkey = des_set_key_skcipher,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
}, {
.base.cra_name = "cbc(des)",
.base.cra_driver_name = "cbc-des-sparc64",
.base.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct des_sparc64_ctx),
.base.cra_alignmask = 7,
.base.cra_module = THIS_MODULE,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = des_set_key_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "ecb(des3_ede)",
.base.cra_driver_name = "ecb-des3_ede-sparc64",
.base.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct des3_ede_sparc64_ctx),
.base.cra_alignmask = 7,
.base.cra_module = THIS_MODULE,
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.setkey = des3_ede_set_key_skcipher,
.encrypt = ecb3_encrypt,
.decrypt = ecb3_decrypt,
}, {
.base.cra_name = "cbc(des3_ede)",
.base.cra_driver_name = "cbc-des3_ede-sparc64",
.base.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct des3_ede_sparc64_ctx),
.base.cra_alignmask = 7,
.base.cra_module = THIS_MODULE,
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
.setkey = des3_ede_set_key_skcipher,
.encrypt = cbc3_encrypt,
.decrypt = cbc3_decrypt,
}
};
static bool __init sparc64_has_des_opcode(void)
{
unsigned long cfr;
if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
return false;
__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
if (!(cfr & CFR_DES))
return false;
return true;
}
static int __init des_sparc64_mod_init(void)
{
int err;
if (!sparc64_has_des_opcode()) {
pr_info("sparc64 des opcodes not available.\n");
return -ENODEV;
}
pr_info("Using sparc64 des opcodes optimized DES implementation\n");
err = crypto_register_algs(cipher_algs, ARRAY_SIZE(cipher_algs));
if (err)
return err;
err = crypto_register_skciphers(skcipher_algs,
ARRAY_SIZE(skcipher_algs));
if (err)
crypto_unregister_algs(cipher_algs, ARRAY_SIZE(cipher_algs));
return err;
}
static void __exit des_sparc64_mod_fini(void)
{
crypto_unregister_algs(cipher_algs, ARRAY_SIZE(cipher_algs));
crypto_unregister_skciphers(skcipher_algs, ARRAY_SIZE(skcipher_algs));
}
module_init(des_sparc64_mod_init);
module_exit(des_sparc64_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms, sparc64 des opcode accelerated");
MODULE_ALIAS_CRYPTO("des");
MODULE_ALIAS_CRYPTO("des3_ede");
#include "crop_devid.c"
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