163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* s390 implementation of the GHASH algorithm for GCM (Galois/Counter Mode).
|
|
*
|
|
* Copyright IBM Corp. 2011
|
|
* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
|
|
*/
|
|
|
|
#include <crypto/internal/hash.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "crypt_s390.h"
|
|
|
|
#define GHASH_BLOCK_SIZE 16
|
|
#define GHASH_DIGEST_SIZE 16
|
|
|
|
struct ghash_ctx {
|
|
u8 icv[16];
|
|
u8 key[16];
|
|
};
|
|
|
|
struct ghash_desc_ctx {
|
|
u8 buffer[GHASH_BLOCK_SIZE];
|
|
u32 bytes;
|
|
};
|
|
|
|
static int ghash_init(struct shash_desc *desc)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
memset(dctx, 0, sizeof(*dctx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_setkey(struct crypto_shash *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
|
|
|
|
if (keylen != GHASH_BLOCK_SIZE) {
|
|
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy(ctx->key, key, GHASH_BLOCK_SIZE);
|
|
memset(ctx->icv, 0, GHASH_BLOCK_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_update(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
|
|
unsigned int n;
|
|
u8 *buf = dctx->buffer;
|
|
int ret;
|
|
|
|
if (dctx->bytes) {
|
|
u8 *pos = buf + (GHASH_BLOCK_SIZE - dctx->bytes);
|
|
|
|
n = min(srclen, dctx->bytes);
|
|
dctx->bytes -= n;
|
|
srclen -= n;
|
|
|
|
memcpy(pos, src, n);
|
|
src += n;
|
|
|
|
if (!dctx->bytes) {
|
|
ret = crypt_s390_kimd(KIMD_GHASH, ctx, buf,
|
|
GHASH_BLOCK_SIZE);
|
|
BUG_ON(ret != GHASH_BLOCK_SIZE);
|
|
}
|
|
}
|
|
|
|
n = srclen & ~(GHASH_BLOCK_SIZE - 1);
|
|
if (n) {
|
|
ret = crypt_s390_kimd(KIMD_GHASH, ctx, src, n);
|
|
BUG_ON(ret != n);
|
|
src += n;
|
|
srclen -= n;
|
|
}
|
|
|
|
if (srclen) {
|
|
dctx->bytes = GHASH_BLOCK_SIZE - srclen;
|
|
memcpy(buf, src, srclen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
|
|
{
|
|
u8 *buf = dctx->buffer;
|
|
int ret;
|
|
|
|
if (dctx->bytes) {
|
|
u8 *pos = buf + (GHASH_BLOCK_SIZE - dctx->bytes);
|
|
|
|
memset(pos, 0, dctx->bytes);
|
|
|
|
ret = crypt_s390_kimd(KIMD_GHASH, ctx, buf, GHASH_BLOCK_SIZE);
|
|
BUG_ON(ret != GHASH_BLOCK_SIZE);
|
|
}
|
|
|
|
dctx->bytes = 0;
|
|
}
|
|
|
|
static int ghash_final(struct shash_desc *desc, u8 *dst)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
|
|
|
|
ghash_flush(ctx, dctx);
|
|
memcpy(dst, ctx->icv, GHASH_BLOCK_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg ghash_alg = {
|
|
.digestsize = GHASH_DIGEST_SIZE,
|
|
.init = ghash_init,
|
|
.update = ghash_update,
|
|
.final = ghash_final,
|
|
.setkey = ghash_setkey,
|
|
.descsize = sizeof(struct ghash_desc_ctx),
|
|
.base = {
|
|
.cra_name = "ghash",
|
|
.cra_driver_name = "ghash-s390",
|
|
.cra_priority = CRYPT_S390_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_blocksize = GHASH_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct ghash_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(ghash_alg.base.cra_list),
|
|
},
|
|
};
|
|
|
|
static int __init ghash_mod_init(void)
|
|
{
|
|
if (!crypt_s390_func_available(KIMD_GHASH,
|
|
CRYPT_S390_MSA | CRYPT_S390_MSA4))
|
|
return -EOPNOTSUPP;
|
|
|
|
return crypto_register_shash(&ghash_alg);
|
|
}
|
|
|
|
static void __exit ghash_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&ghash_alg);
|
|
}
|
|
|
|
module_init(ghash_mod_init);
|
|
module_exit(ghash_mod_exit);
|
|
|
|
MODULE_ALIAS("ghash");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("GHASH Message Digest Algorithm, s390 implementation");
|