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/* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes.
*
* Copyright (C) 2012 David S. Miller <davem@davemloft.net>
*/
#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 <asm/fpumacro.h>
#include <asm/pstate.h>
#include <asm/elf.h>
#include "opcodes.h"
#define CAMELLIA_MIN_KEY_SIZE 16
#define CAMELLIA_MAX_KEY_SIZE 32
#define CAMELLIA_BLOCK_SIZE 16
#define CAMELLIA_TABLE_BYTE_LEN 272
struct camellia_sparc64_ctx {
u64 encrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
u64 decrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
int key_len;
};
extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key,
unsigned int key_len, u64 *decrypt_key);
static int camellia_set_key(struct crypto_tfm *tfm, const u8 *_in_key,
unsigned int key_len)
{
struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
const u32 *in_key = (const u32 *) _in_key;
u32 *flags = &tfm->crt_flags;
if (key_len != 16 && key_len != 24 && key_len != 32) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
ctx->key_len = key_len;
camellia_sparc64_key_expand(in_key, &ctx->encrypt_key[0],
key_len, &ctx->decrypt_key[0]);
return 0;
}
extern void camellia_sparc64_crypt(const u64 *key, const u32 *input,
u32 *output, unsigned int key_len);
static void camellia_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
camellia_sparc64_crypt(&ctx->encrypt_key[0],
(const u32 *) src,
(u32 *) dst, ctx->key_len);
}
static void camellia_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
camellia_sparc64_crypt(&ctx->decrypt_key[0],
(const u32 *) src,
(u32 *) dst, ctx->key_len);
}
extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len);
typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len,
const u64 *key);
extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds;
extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds;
#define CAMELLIA_BLOCK_MASK (~(CAMELLIA_BLOCK_SIZE - 1))
static int __ecb_crypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes, bool encrypt)
{
struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
ecb_crypt_op *op;
const u64 *key;
int err;
op = camellia_sparc64_ecb_crypt_3_grand_rounds;
if (ctx->key_len != 16)
op = camellia_sparc64_ecb_crypt_4_grand_rounds;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
if (encrypt)
key = &ctx->encrypt_key[0];
else
key = &ctx->decrypt_key[0];
camellia_sparc64_load_keys(key, ctx->key_len);
while ((nbytes = walk.nbytes)) {
unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
if (likely(block_len)) {
const u64 *src64;
u64 *dst64;
src64 = (const u64 *)walk.src.virt.addr;
dst64 = (u64 *) walk.dst.virt.addr;
op(src64, dst64, block_len, key);
}
nbytes &= CAMELLIA_BLOCK_SIZE - 1;
err = blkcipher_walk_done(desc, &walk, nbytes);
}
fprs_write(0);
return err;
}
static int ecb_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
return __ecb_crypt(desc, dst, src, nbytes, true);
}
static int ecb_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
return __ecb_crypt(desc, dst, src, nbytes, false);
}
typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
const u64 *key, u64 *iv);
extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
static int cbc_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
cbc_crypt_op *op;
const u64 *key;
int err;
op = camellia_sparc64_cbc_encrypt_3_grand_rounds;
if (ctx->key_len != 16)
op = camellia_sparc64_cbc_encrypt_4_grand_rounds;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
key = &ctx->encrypt_key[0];
camellia_sparc64_load_keys(key, ctx->key_len);
while ((nbytes = walk.nbytes)) {
unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
if (likely(block_len)) {
const u64 *src64;
u64 *dst64;
src64 = (const u64 *)walk.src.virt.addr;
dst64 = (u64 *) walk.dst.virt.addr;
op(src64, dst64, block_len, key,
(u64 *) walk.iv);
}
nbytes &= CAMELLIA_BLOCK_SIZE - 1;
err = blkcipher_walk_done(desc, &walk, nbytes);
}
fprs_write(0);
return err;
}
static int cbc_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
cbc_crypt_op *op;
const u64 *key;
int err;
op = camellia_sparc64_cbc_decrypt_3_grand_rounds;
if (ctx->key_len != 16)
op = camellia_sparc64_cbc_decrypt_4_grand_rounds;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
key = &ctx->decrypt_key[0];
camellia_sparc64_load_keys(key, ctx->key_len);
while ((nbytes = walk.nbytes)) {
unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
if (likely(block_len)) {
const u64 *src64;
u64 *dst64;
src64 = (const u64 *)walk.src.virt.addr;
dst64 = (u64 *) walk.dst.virt.addr;
op(src64, dst64, block_len, key,
(u64 *) walk.iv);
}
nbytes &= CAMELLIA_BLOCK_SIZE - 1;
err = blkcipher_walk_done(desc, &walk, nbytes);
}
fprs_write(0);
return err;
}
static struct crypto_alg algs[] = { {
.cra_name = "camellia",
.cra_driver_name = "camellia-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct camellia_sparc64_ctx),
.cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = CAMELLIA_MIN_KEY_SIZE,
.cia_max_keysize = CAMELLIA_MAX_KEY_SIZE,
.cia_setkey = camellia_set_key,
.cia_encrypt = camellia_encrypt,
.cia_decrypt = camellia_decrypt
}
}
}, {
.cra_name = "ecb(camellia)",
.cra_driver_name = "ecb-camellia-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct camellia_sparc64_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = CAMELLIA_MIN_KEY_SIZE,
.max_keysize = CAMELLIA_MAX_KEY_SIZE,
.setkey = camellia_set_key,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
},
},
}, {
.cra_name = "cbc(camellia)",
.cra_driver_name = "cbc-camellia-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct camellia_sparc64_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = CAMELLIA_MIN_KEY_SIZE,
.max_keysize = CAMELLIA_MAX_KEY_SIZE,
.setkey = camellia_set_key,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
},
},
}
};
static bool __init sparc64_has_camellia_opcode(void)
{
unsigned long cfr;
if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
return false;
__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
if (!(cfr & CFR_CAMELLIA))
return false;
return true;
}
static int __init camellia_sparc64_mod_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(algs); i++)
INIT_LIST_HEAD(&algs[i].cra_list);
if (sparc64_has_camellia_opcode()) {
pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n");
return crypto_register_algs(algs, ARRAY_SIZE(algs));
}
pr_info("sparc64 camellia opcodes not available.\n");
return -ENODEV;
}
static void __exit camellia_sparc64_mod_fini(void)
{
crypto_unregister_algs(algs, ARRAY_SIZE(algs));
}
module_init(camellia_sparc64_mod_init);
module_exit(camellia_sparc64_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
MODULE_ALIAS_CRYPTO("aes");
#include "crop_devid.c"
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