mirror of
https://github.com/adulau/aha.git
synced 2024-12-27 19:26:25 +00:00
[S390] crypto: cleanup.
Cleanup code and remove obsolete documentation. Signed-off-by: Jan Glauber <jan.glauber@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber
Martin Schwidefsky
parent
6d4740c89c
commit
131a395c18
3 changed files with 79 additions and 167 deletions
|
|
@ -1,83 +0,0 @@
|
|||
crypto-API support for z990 Message Security Assist (MSA) instructions
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
AUTHOR: Thomas Spatzier (tspat@de.ibm.com)
|
||||
|
||||
|
||||
1. Introduction crypto-API
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
See Documentation/crypto/api-intro.txt for an introduction/description of the
|
||||
kernel crypto API.
|
||||
According to api-intro.txt support for z990 crypto instructions has been added
|
||||
in the algorithm api layer of the crypto API. Several files containing z990
|
||||
optimized implementations of crypto algorithms are placed in the
|
||||
arch/s390/crypto directory.
|
||||
|
||||
|
||||
2. Probing for availability of MSA
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
It should be possible to use Kernels with the z990 crypto implementations both
|
||||
on machines with MSA available and on those without MSA (pre z990 or z990
|
||||
without MSA). Therefore a simple probing mechanism has been implemented:
|
||||
In the init function of each crypto module the availability of MSA and of the
|
||||
respective crypto algorithm in particular will be tested. If the algorithm is
|
||||
available the module will load and register its algorithm with the crypto API.
|
||||
|
||||
If the respective crypto algorithm is not available, the init function will
|
||||
return -ENOSYS. In that case a fallback to the standard software implementation
|
||||
of the crypto algorithm must be taken ( -> the standard crypto modules are
|
||||
also built when compiling the kernel).
|
||||
|
||||
|
||||
3. Ensuring z990 crypto module preference
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
If z990 crypto instructions are available the optimized modules should be
|
||||
preferred instead of standard modules.
|
||||
|
||||
3.1. compiled-in modules
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
For compiled-in modules it has to be ensured that the z990 modules are linked
|
||||
before the standard crypto modules. Then, on system startup the init functions
|
||||
of z990 crypto modules will be called first and query for availability of z990
|
||||
crypto instructions. If instruction is available, the z990 module will register
|
||||
its crypto algorithm implementation -> the load of the standard module will fail
|
||||
since the algorithm is already registered.
|
||||
If z990 crypto instruction is not available the load of the z990 module will
|
||||
fail -> the standard module will load and register its algorithm.
|
||||
|
||||
3.2. dynamic modules
|
||||
~~~~~~~~~~~~~~~~~~~~
|
||||
A system administrator has to take care of giving preference to z990 crypto
|
||||
modules. If MSA is available appropriate lines have to be added to
|
||||
/etc/modprobe.conf.
|
||||
|
||||
Example: z990 crypto instruction for SHA1 algorithm is available
|
||||
|
||||
add the following line to /etc/modprobe.conf (assuming the
|
||||
z990 crypto modules for SHA1 is called sha1_z990):
|
||||
|
||||
alias sha1 sha1_z990
|
||||
|
||||
-> when the sha1 algorithm is requested through the crypto API
|
||||
(which has a module autoloader) the z990 module will be loaded.
|
||||
|
||||
TBD: a userspace module probing mechanism
|
||||
something like 'probe sha1 sha1_z990 sha1' in modprobe.conf
|
||||
-> try module sha1_z990, if it fails to load standard module sha1
|
||||
the 'probe' statement is currently not supported in modprobe.conf
|
||||
|
||||
|
||||
4. Currently implemented z990 crypto algorithms
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
The following crypto algorithms with z990 MSA support are currently implemented.
|
||||
The name of each algorithm under which it is registered in crypto API and the
|
||||
name of the respective module is given in square brackets.
|
||||
|
||||
- SHA1 Digest Algorithm [sha1 -> sha1_z990]
|
||||
- DES Encrypt/Decrypt Algorithm (64bit key) [des -> des_z990]
|
||||
- Triple DES Encrypt/Decrypt Algorithm (128bit key) [des3_ede128 -> des_z990]
|
||||
- Triple DES Encrypt/Decrypt Algorithm (192bit key) [des3_ede -> des_z990]
|
||||
|
||||
In order to load, for example, the sha1_z990 module when the sha1 algorithm is
|
||||
requested (see 3.2.) add 'alias sha1 sha1_z990' to /etc/modprobe.conf.
|
||||
|
||||
|
|
@ -25,99 +25,100 @@
|
|||
*/
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <asm/scatterlist.h>
|
||||
#include <asm/byteorder.h>
|
||||
|
||||
#include "crypt_s390.h"
|
||||
|
||||
#define SHA1_DIGEST_SIZE 20
|
||||
#define SHA1_BLOCK_SIZE 64
|
||||
|
||||
struct crypt_s390_sha1_ctx {
|
||||
u64 count;
|
||||
struct s390_sha1_ctx {
|
||||
u64 count; /* message length */
|
||||
u32 state[5];
|
||||
u32 buf_len;
|
||||
u8 buffer[2 * SHA1_BLOCK_SIZE];
|
||||
u8 buf[2 * SHA1_BLOCK_SIZE];
|
||||
};
|
||||
|
||||
static void sha1_init(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypt_s390_sha1_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
|
||||
|
||||
ctx->state[0] = 0x67452301;
|
||||
ctx->state[1] = 0xEFCDAB89;
|
||||
ctx->state[2] = 0x98BADCFE;
|
||||
ctx->state[3] = 0x10325476;
|
||||
ctx->state[4] = 0xC3D2E1F0;
|
||||
|
||||
ctx->count = 0;
|
||||
ctx->buf_len = 0;
|
||||
sctx->state[0] = 0x67452301;
|
||||
sctx->state[1] = 0xEFCDAB89;
|
||||
sctx->state[2] = 0x98BADCFE;
|
||||
sctx->state[3] = 0x10325476;
|
||||
sctx->state[4] = 0xC3D2E1F0;
|
||||
sctx->count = 0;
|
||||
}
|
||||
|
||||
static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
|
||||
unsigned int len)
|
||||
{
|
||||
struct crypt_s390_sha1_ctx *sctx;
|
||||
long imd_len;
|
||||
struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
|
||||
unsigned int index;
|
||||
int ret;
|
||||
|
||||
sctx = crypto_tfm_ctx(tfm);
|
||||
sctx->count += len * 8; /* message bit length */
|
||||
/* how much is already in the buffer? */
|
||||
index = sctx->count & 0x3f;
|
||||
|
||||
/* anything in buffer yet? -> must be completed */
|
||||
if (sctx->buf_len && (sctx->buf_len + len) >= SHA1_BLOCK_SIZE) {
|
||||
/* complete full block and hash */
|
||||
memcpy(sctx->buffer + sctx->buf_len, data,
|
||||
SHA1_BLOCK_SIZE - sctx->buf_len);
|
||||
crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer,
|
||||
SHA1_BLOCK_SIZE);
|
||||
data += SHA1_BLOCK_SIZE - sctx->buf_len;
|
||||
len -= SHA1_BLOCK_SIZE - sctx->buf_len;
|
||||
sctx->buf_len = 0;
|
||||
sctx->count += len;
|
||||
|
||||
if (index + len < SHA1_BLOCK_SIZE)
|
||||
goto store;
|
||||
|
||||
/* process one stored block */
|
||||
if (index) {
|
||||
memcpy(sctx->buf + index, data, SHA1_BLOCK_SIZE - index);
|
||||
ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf,
|
||||
SHA1_BLOCK_SIZE);
|
||||
BUG_ON(ret != SHA1_BLOCK_SIZE);
|
||||
data += SHA1_BLOCK_SIZE - index;
|
||||
len -= SHA1_BLOCK_SIZE - index;
|
||||
}
|
||||
|
||||
/* rest of data contains full blocks? */
|
||||
imd_len = len & ~0x3ful;
|
||||
if (imd_len) {
|
||||
crypt_s390_kimd(KIMD_SHA_1, sctx->state, data, imd_len);
|
||||
data += imd_len;
|
||||
len -= imd_len;
|
||||
/* process as many blocks as possible */
|
||||
if (len >= SHA1_BLOCK_SIZE) {
|
||||
ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, data,
|
||||
len & ~(SHA1_BLOCK_SIZE - 1));
|
||||
BUG_ON(ret != (len & ~(SHA1_BLOCK_SIZE - 1)));
|
||||
data += ret;
|
||||
len -= ret;
|
||||
}
|
||||
/* anything left? store in buffer */
|
||||
if (len) {
|
||||
memcpy(sctx->buffer + sctx->buf_len , data, len);
|
||||
sctx->buf_len += len;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void pad_message(struct crypt_s390_sha1_ctx* sctx)
|
||||
{
|
||||
int index;
|
||||
|
||||
index = sctx->buf_len;
|
||||
sctx->buf_len = (sctx->buf_len < 56) ?
|
||||
SHA1_BLOCK_SIZE:2 * SHA1_BLOCK_SIZE;
|
||||
/* start pad with 1 */
|
||||
sctx->buffer[index] = 0x80;
|
||||
/* pad with zeros */
|
||||
index++;
|
||||
memset(sctx->buffer + index, 0x00, sctx->buf_len - index);
|
||||
/* append length */
|
||||
memcpy(sctx->buffer + sctx->buf_len - 8, &sctx->count,
|
||||
sizeof sctx->count);
|
||||
store:
|
||||
/* anything left? */
|
||||
if (len)
|
||||
memcpy(sctx->buf + index , data, len);
|
||||
}
|
||||
|
||||
/* Add padding and return the message digest. */
|
||||
static void sha1_final(struct crypto_tfm *tfm, u8 *out)
|
||||
{
|
||||
struct crypt_s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
|
||||
struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
|
||||
u64 bits;
|
||||
unsigned int index, end;
|
||||
int ret;
|
||||
|
||||
/* must perform manual padding */
|
||||
pad_message(sctx);
|
||||
crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, sctx->buf_len);
|
||||
index = sctx->count & 0x3f;
|
||||
end = (index < 56) ? SHA1_BLOCK_SIZE : (2 * SHA1_BLOCK_SIZE);
|
||||
|
||||
/* start pad with 1 */
|
||||
sctx->buf[index] = 0x80;
|
||||
|
||||
/* pad with zeros */
|
||||
index++;
|
||||
memset(sctx->buf + index, 0x00, end - index - 8);
|
||||
|
||||
/* append message length */
|
||||
bits = sctx->count * 8;
|
||||
memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
|
||||
|
||||
ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf, end);
|
||||
BUG_ON(ret != end);
|
||||
|
||||
/* copy digest to out */
|
||||
memcpy(out, sctx->state, SHA1_DIGEST_SIZE);
|
||||
|
||||
/* wipe context */
|
||||
memset(sctx, 0, sizeof *sctx);
|
||||
}
|
||||
|
|
@ -128,7 +129,7 @@ static struct crypto_alg alg = {
|
|||
.cra_priority = CRYPT_S390_PRIORITY,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
|
||||
.cra_blocksize = SHA1_BLOCK_SIZE,
|
||||
.cra_ctxsize = sizeof(struct crypt_s390_sha1_ctx),
|
||||
.cra_ctxsize = sizeof(struct s390_sha1_ctx),
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_list = LIST_HEAD_INIT(alg.cra_list),
|
||||
.cra_u = { .digest = {
|
||||
|
|
|
|||
|
|
@ -26,7 +26,7 @@
|
|||
#define SHA256_BLOCK_SIZE 64
|
||||
|
||||
struct s390_sha256_ctx {
|
||||
u64 count;
|
||||
u64 count; /* message length */
|
||||
u32 state[8];
|
||||
u8 buf[2 * SHA256_BLOCK_SIZE];
|
||||
};
|
||||
|
|
@ -54,10 +54,9 @@ static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
|
|||
int ret;
|
||||
|
||||
/* how much is already in the buffer? */
|
||||
index = sctx->count / 8 & 0x3f;
|
||||
index = sctx->count & 0x3f;
|
||||
|
||||
/* update message bit length */
|
||||
sctx->count += len * 8;
|
||||
sctx->count += len;
|
||||
|
||||
if ((index + len) < SHA256_BLOCK_SIZE)
|
||||
goto store;
|
||||
|
|
@ -87,12 +86,17 @@ store:
|
|||
memcpy(sctx->buf + index , data, len);
|
||||
}
|
||||
|
||||
static void pad_message(struct s390_sha256_ctx* sctx)
|
||||
/* Add padding and return the message digest */
|
||||
static void sha256_final(struct crypto_tfm *tfm, u8 *out)
|
||||
{
|
||||
int index, end;
|
||||
struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
|
||||
u64 bits;
|
||||
unsigned int index, end;
|
||||
int ret;
|
||||
|
||||
index = sctx->count / 8 & 0x3f;
|
||||
end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
|
||||
/* must perform manual padding */
|
||||
index = sctx->count & 0x3f;
|
||||
end = (index < 56) ? SHA256_BLOCK_SIZE : (2 * SHA256_BLOCK_SIZE);
|
||||
|
||||
/* start pad with 1 */
|
||||
sctx->buf[index] = 0x80;
|
||||
|
|
@ -102,21 +106,11 @@ static void pad_message(struct s390_sha256_ctx* sctx)
|
|||
memset(sctx->buf + index, 0x00, end - index - 8);
|
||||
|
||||
/* append message length */
|
||||
memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
|
||||
bits = sctx->count * 8;
|
||||
memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
|
||||
|
||||
sctx->count = end * 8;
|
||||
}
|
||||
|
||||
/* Add padding and return the message digest */
|
||||
static void sha256_final(struct crypto_tfm *tfm, u8 *out)
|
||||
{
|
||||
struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
|
||||
|
||||
/* must perform manual padding */
|
||||
pad_message(sctx);
|
||||
|
||||
crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
|
||||
sctx->count / 8);
|
||||
ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf, end);
|
||||
BUG_ON(ret != end);
|
||||
|
||||
/* copy digest to out */
|
||||
memcpy(out, sctx->state, SHA256_DIGEST_SIZE);
|
||||
|
|
|
|||
Loading…
Reference in a new issue