157 lines
3.1 KiB
C
157 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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 <linux/cpufeature.h>
|
|
#include <asm/cpacf.h>
|
|
|
|
#define GHASH_BLOCK_SIZE 16
|
|
#define GHASH_DIGEST_SIZE 16
|
|
|
|
struct ghash_ctx {
|
|
u8 key[GHASH_BLOCK_SIZE];
|
|
};
|
|
|
|
struct ghash_desc_ctx {
|
|
u8 icv[GHASH_BLOCK_SIZE];
|
|
u8 key[GHASH_BLOCK_SIZE];
|
|
u8 buffer[GHASH_BLOCK_SIZE];
|
|
u32 bytes;
|
|
};
|
|
|
|
static int ghash_init(struct shash_desc *desc)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
|
|
|
|
memset(dctx, 0, sizeof(*dctx));
|
|
memcpy(dctx->key, ctx->key, GHASH_BLOCK_SIZE);
|
|
|
|
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);
|
|
|
|
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);
|
|
unsigned int n;
|
|
u8 *buf = dctx->buffer;
|
|
|
|
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) {
|
|
cpacf_kimd(CPACF_KIMD_GHASH, dctx, buf,
|
|
GHASH_BLOCK_SIZE);
|
|
}
|
|
}
|
|
|
|
n = srclen & ~(GHASH_BLOCK_SIZE - 1);
|
|
if (n) {
|
|
cpacf_kimd(CPACF_KIMD_GHASH, dctx, src, n);
|
|
src += n;
|
|
srclen -= n;
|
|
}
|
|
|
|
if (srclen) {
|
|
dctx->bytes = GHASH_BLOCK_SIZE - srclen;
|
|
memcpy(buf, src, srclen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_flush(struct ghash_desc_ctx *dctx)
|
|
{
|
|
u8 *buf = dctx->buffer;
|
|
|
|
if (dctx->bytes) {
|
|
u8 *pos = buf + (GHASH_BLOCK_SIZE - dctx->bytes);
|
|
|
|
memset(pos, 0, dctx->bytes);
|
|
cpacf_kimd(CPACF_KIMD_GHASH, dctx, buf, GHASH_BLOCK_SIZE);
|
|
dctx->bytes = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ghash_final(struct shash_desc *desc, u8 *dst)
|
|
{
|
|
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
int ret;
|
|
|
|
ret = ghash_flush(dctx);
|
|
if (!ret)
|
|
memcpy(dst, dctx->icv, GHASH_BLOCK_SIZE);
|
|
return ret;
|
|
}
|
|
|
|
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 = 300,
|
|
.cra_blocksize = GHASH_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct ghash_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init ghash_mod_init(void)
|
|
{
|
|
if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_GHASH))
|
|
return -EOPNOTSUPP;
|
|
|
|
return crypto_register_shash(&ghash_alg);
|
|
}
|
|
|
|
static void __exit ghash_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&ghash_alg);
|
|
}
|
|
|
|
module_cpu_feature_match(MSA, ghash_mod_init);
|
|
module_exit(ghash_mod_exit);
|
|
|
|
MODULE_ALIAS_CRYPTO("ghash");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("GHASH Message Digest Algorithm, s390 implementation");
|