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crypto: s390 - add System z hardware support for CTR mode 

This patch adds System z hardware acceleration support for AES, DES
and 3DES in CTR mode. The hardware support is available starting with
System z196.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gerald Schaefer 2011-05-04 15:09:44 +10:00 committed by Herbert Xu
parent 9996e3421c
commit 0200f3ecc1
4 changed files with 383 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

146
arch/s390/crypto/aes_s390.c
View File

@ -31,7 +31,8 @@
#define AES_KEYLEN_192 2
#define AES_KEYLEN_256 4
static char keylen_flag = 0;
static u8 *ctrblk;
static char keylen_flag;
struct s390_aes_ctx {
u8 iv[AES_BLOCK_SIZE];
@ -724,9 +725,128 @@ static struct crypto_alg xts_aes_alg = {
}
};
static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
switch (key_len) {
case 16:
sctx->enc = KMCTR_AES_128_ENCRYPT;
sctx->dec = KMCTR_AES_128_DECRYPT;
break;
case 24:
sctx->enc = KMCTR_AES_192_ENCRYPT;
sctx->dec = KMCTR_AES_192_DECRYPT;
break;
case 32:
sctx->enc = KMCTR_AES_256_ENCRYPT;
sctx->dec = KMCTR_AES_256_DECRYPT;
break;
}
return aes_set_key(tfm, in_key, key_len);
}
static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)
{
int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
unsigned int i, n, nbytes;
u8 buf[AES_BLOCK_SIZE];
u8 *out, *in;
if (!walk->nbytes)
return ret;
memcpy(ctrblk, walk->iv, AES_BLOCK_SIZE);
while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
while (nbytes >= AES_BLOCK_SIZE) {
/* only use complete blocks, max. PAGE_SIZE */
n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
nbytes & ~(AES_BLOCK_SIZE - 1);
for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {
memcpy(ctrblk + i, ctrblk + i - AES_BLOCK_SIZE,
AES_BLOCK_SIZE);
crypto_inc(ctrblk + i, AES_BLOCK_SIZE);
}
ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk);
BUG_ON(ret < 0 || ret != n);
if (n > AES_BLOCK_SIZE)
memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE,
AES_BLOCK_SIZE);
crypto_inc(ctrblk, AES_BLOCK_SIZE);
out += n;
in += n;
nbytes -= n;
}
ret = blkcipher_walk_done(desc, walk, nbytes);
}
/*
* final block may be < AES_BLOCK_SIZE, copy only nbytes
*/
if (nbytes) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
ret = crypt_s390_kmctr(func, sctx->key, buf, in,
AES_BLOCK_SIZE, ctrblk);
BUG_ON(ret < 0 || ret != AES_BLOCK_SIZE);
memcpy(out, buf, nbytes);
crypto_inc(ctrblk, AES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
}
memcpy(walk->iv, ctrblk, AES_BLOCK_SIZE);
return ret;
}
static int ctr_aes_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_aes_crypt(desc, sctx->enc, sctx, &walk);
}
static int ctr_aes_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_aes_crypt(desc, sctx->dec, sctx, &walk);
}
static struct crypto_alg ctr_aes_alg = {
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct s390_aes_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(ctr_aes_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ctr_aes_set_key,
.encrypt = ctr_aes_encrypt,
.decrypt = ctr_aes_decrypt,
}
}
};
static int __init aes_s390_init(void)
{
unsigned long long facility_bits[2];
int ret;
if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
@ -765,9 +885,29 @@ static int __init aes_s390_init(void)
goto xts_aes_err;
}
if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
crypt_s390_func_available(KMCTR_AES_192_ENCRYPT,
CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
crypt_s390_func_available(KMCTR_AES_256_ENCRYPT,
CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;
goto ctr_aes_err;
}
ret = crypto_register_alg(&ctr_aes_alg);
if (ret) {
free_page((unsigned long) ctrblk);
goto ctr_aes_err;
}
}
out:
return ret;
ctr_aes_err:
crypto_unregister_alg(&xts_aes_alg);
xts_aes_err:
crypto_unregister_alg(&cbc_aes_alg);
cbc_aes_err:
@ -780,6 +920,8 @@ aes_err:
static void __exit aes_s390_fini(void)
{
crypto_unregister_alg(&ctr_aes_alg);
free_page((unsigned long) ctrblk);
crypto_unregister_alg(&xts_aes_alg);
crypto_unregister_alg(&cbc_aes_alg);
crypto_unregister_alg(&ecb_aes_alg);

66
arch/s390/crypto/crypt_s390.h
View File

@ -34,7 +34,8 @@ enum crypt_s390_operations {
CRYPT_S390_KMC = 0x0200,
CRYPT_S390_KIMD = 0x0300,
CRYPT_S390_KLMD = 0x0400,
CRYPT_S390_KMAC = 0x0500
CRYPT_S390_KMAC = 0x0500,
CRYPT_S390_KMCTR = 0x0600
};
/*
@ -82,6 +83,26 @@ enum crypt_s390_kmc_func {
KMC_PRNG = CRYPT_S390_KMC | 0x43,
};
/*
* function codes for KMCTR (CIPHER MESSAGE WITH COUNTER)
* instruction
*/
enum crypt_s390_kmctr_func {
KMCTR_QUERY = CRYPT_S390_KMCTR | 0x0,
KMCTR_DEA_ENCRYPT = CRYPT_S390_KMCTR | 0x1,
KMCTR_DEA_DECRYPT = CRYPT_S390_KMCTR | 0x1 | 0x80,
KMCTR_TDEA_128_ENCRYPT = CRYPT_S390_KMCTR | 0x2,
KMCTR_TDEA_128_DECRYPT = CRYPT_S390_KMCTR | 0x2 | 0x80,
KMCTR_TDEA_192_ENCRYPT = CRYPT_S390_KMCTR | 0x3,
KMCTR_TDEA_192_DECRYPT = CRYPT_S390_KMCTR | 0x3 | 0x80,
KMCTR_AES_128_ENCRYPT = CRYPT_S390_KMCTR | 0x12,
KMCTR_AES_128_DECRYPT = CRYPT_S390_KMCTR | 0x12 | 0x80,
KMCTR_AES_192_ENCRYPT = CRYPT_S390_KMCTR | 0x13,
KMCTR_AES_192_DECRYPT = CRYPT_S390_KMCTR | 0x13 | 0x80,
KMCTR_AES_256_ENCRYPT = CRYPT_S390_KMCTR | 0x14,
KMCTR_AES_256_DECRYPT = CRYPT_S390_KMCTR | 0x14 | 0x80,
};
/*
* function codes for KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST)
* instruction
@ -292,6 +313,45 @@ static inline int crypt_s390_kmac(long func, void *param,
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/**
* crypt_s390_kmctr:
* @func: the function code passed to KMCTR; see crypt_s390_kmctr_func
* @param: address of parameter block; see POP for details on each func
* @dest: address of destination memory area
* @src: address of source memory area
* @src_len: length of src operand in bytes
* @counter: address of counter value
*
* Executes the KMCTR (CIPHER MESSAGE WITH COUNTER) operation of the CPU.
*
* Returns -1 for failure, 0 for the query func, number of processed
* bytes for encryption/decryption funcs
*/
static inline int crypt_s390_kmctr(long func, void *param, u8 *dest,
const u8 *src, long src_len, u8 *counter)
{
register long __func asm("0") = func & CRYPT_S390_FUNC_MASK;
register void *__param asm("1") = param;
register const u8 *__src asm("2") = src;
register long __src_len asm("3") = src_len;
register u8 *__dest asm("4") = dest;
register u8 *__ctr asm("6") = counter;
int ret = -1;
asm volatile(
"0: .insn rrf,0xb92d0000,%3,%1,%4,0 \n" /* KMCTR opcode */
"1: brc 1,0b \n" /* handle partial completion */
" la %0,0\n"
"2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b)
: "+d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest),
"+a" (__ctr)
: "d" (__func), "a" (__param) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/**
* crypt_s390_func_available:
* @func: the function code of the specific function; 0 if op in general
@ -329,6 +389,10 @@ static inline int crypt_s390_func_available(int func,
case CRYPT_S390_KMAC:
ret = crypt_s390_kmac(KMAC_QUERY, &status, NULL, 0);
break;
case CRYPT_S390_KMCTR:
ret = crypt_s390_kmctr(KMCTR_QUERY, &status, NULL, NULL, 0,
NULL);
break;
default:
return 0;
}

169
arch/s390/crypto/des_s390.c
View File

@ -3,7 +3,7 @@
*
* s390 implementation of the DES Cipher Algorithm.
*
* Copyright IBM Corp. 2003,2007
* Copyright IBM Corp. 2003,2011
* Author(s): Thomas Spatzier
* Jan Glauber (jan.glauber@de.ibm.com)
*
@ -24,6 +24,8 @@
#define DES3_KEY_SIZE (3 * DES_KEY_SIZE)
static u8 *ctrblk;
struct s390_des_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_KEY_SIZE];
@ -370,6 +372,143 @@ static struct crypto_alg cbc_des3_alg = {
}
};
static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
struct s390_des_ctx *ctx, struct blkcipher_walk *walk)
{
int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
unsigned int i, n, nbytes;
u8 buf[DES_BLOCK_SIZE];
u8 *out, *in;
memcpy(ctrblk, walk->iv, DES_BLOCK_SIZE);
while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
while (nbytes >= DES_BLOCK_SIZE) {
/* align to block size, max. PAGE_SIZE */
n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
nbytes & ~(DES_BLOCK_SIZE - 1);
for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {
memcpy(ctrblk + i, ctrblk + i - DES_BLOCK_SIZE,
DES_BLOCK_SIZE);
crypto_inc(ctrblk + i, DES_BLOCK_SIZE);
}
ret = crypt_s390_kmctr(func, ctx->key, out, in, n, ctrblk);
BUG_ON((ret < 0) || (ret != n));
if (n > DES_BLOCK_SIZE)
memcpy(ctrblk, ctrblk + n - DES_BLOCK_SIZE,
DES_BLOCK_SIZE);
crypto_inc(ctrblk, DES_BLOCK_SIZE);
out += n;
in += n;
nbytes -= n;
}
ret = blkcipher_walk_done(desc, walk, nbytes);
}
/* final block may be < DES_BLOCK_SIZE, copy only nbytes */
if (nbytes) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
ret = crypt_s390_kmctr(func, ctx->key, buf, in,
DES_BLOCK_SIZE, ctrblk);
BUG_ON(ret < 0 || ret != DES_BLOCK_SIZE);
memcpy(out, buf, nbytes);
crypto_inc(ctrblk, DES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
}
memcpy(walk->iv, ctrblk, DES_BLOCK_SIZE);
return ret;
}
static int ctr_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, KMCTR_DEA_ENCRYPT, ctx, &walk);
}
static int ctr_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, KMCTR_DEA_DECRYPT, ctx, &walk);
}
static struct crypto_alg ctr_des_alg = {
.cra_name = "ctr(des)",
.cra_driver_name = "ctr-des-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct s390_des_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(ctr_des_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = des_setkey,
.encrypt = ctr_des_encrypt,
.decrypt = ctr_des_decrypt,
}
}
};
static int ctr_des3_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, KMCTR_TDEA_192_ENCRYPT, ctx, &walk);
}
static int ctr_des3_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, KMCTR_TDEA_192_DECRYPT, ctx, &walk);
}
static struct crypto_alg ctr_des3_alg = {
.cra_name = "ctr(des3_ede)",
.cra_driver_name = "ctr-des3_ede-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct s390_des_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(ctr_des3_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES3_KEY_SIZE,
.max_keysize = DES3_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = des3_setkey,
.encrypt = ctr_des3_encrypt,
.decrypt = ctr_des3_decrypt,
}
}
};
static int __init des_s390_init(void)
{
int ret;
@ -396,9 +535,32 @@ static int __init des_s390_init(void)
ret = crypto_register_alg(&cbc_des3_alg);
if (ret)
goto cbc_des3_err;
if (crypt_s390_func_available(KMCTR_DEA_ENCRYPT,
CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
crypt_s390_func_available(KMCTR_TDEA_192_ENCRYPT,
CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
ret = crypto_register_alg(&ctr_des_alg);
if (ret)
goto ctr_des_err;
ret = crypto_register_alg(&ctr_des3_alg);
if (ret)
goto ctr_des3_err;
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;
goto ctr_mem_err;
}
}
out:
return ret;
ctr_mem_err:
crypto_unregister_alg(&ctr_des3_alg);
ctr_des3_err:
crypto_unregister_alg(&ctr_des_alg);
ctr_des_err:
crypto_unregister_alg(&cbc_des3_alg);
cbc_des3_err:
crypto_unregister_alg(&ecb_des3_alg);
ecb_des3_err:
@ -415,6 +577,11 @@ des_err:
static void __exit des_s390_exit(void)
{
if (ctrblk) {
crypto_unregister_alg(&ctr_des_alg);
crypto_unregister_alg(&ctr_des3_alg);
free_page((unsigned long) ctrblk);
}
crypto_unregister_alg(&cbc_des3_alg);
crypto_unregister_alg(&ecb_des3_alg);
crypto_unregister_alg(&des3_alg);

8
drivers/crypto/Kconfig
View File

@ -119,9 +119,12 @@ config CRYPTO_DES_S390
select CRYPTO_ALGAPI
select CRYPTO_BLKCIPHER
help
This us the s390 hardware accelerated implementation of the
This is the s390 hardware accelerated implementation of the
DES cipher algorithm (FIPS 46-2), and Triple DES EDE (FIPS 46-3).
As of z990 the ECB and CBC mode are hardware accelerated.
As of z196 the CTR mode is hardware accelerated.
config CRYPTO_AES_S390
tristate "AES cipher algorithms"
depends on S390
@ -135,7 +138,8 @@ config CRYPTO_AES_S390
for 128 bit keys.
As of z10 the ECB and CBC modes are hardware accelerated
for all AES key sizes.
As of z196 the XTS mode is hardware accelerated for 256 and
As of z196 the CTR mode is hardware accelerated for all AES
key sizes and XTS mode is hardware accelerated for 256 and
512 bit keys.
config S390_PRNG