mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 17:23:55 +08:00
s390/crypto: add s390 platform specific aes gcm support.
This patch introduces gcm(aes) support into the aes_s390 kernel module. Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com> Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Harald Freudenberger
Martin Schwidefsky
parent
eecd49c462
commit
bf7fa03870
@ -4,9 +4,11 @@
|
||||
* s390 implementation of the AES Cipher Algorithm.
|
||||
*
|
||||
* s390 Version:
|
||||
* Copyright IBM Corp. 2005, 2007
|
||||
* Copyright IBM Corp. 2005, 2017
|
||||
* Author(s): Jan Glauber (jang@de.ibm.com)
|
||||
* Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
|
||||
* Patrick Steuer <patrick.steuer@de.ibm.com>
|
||||
* Harald Freudenberger <freude@de.ibm.com>
|
||||
*
|
||||
* Derived from "crypto/aes_generic.c"
|
||||
*
|
||||
@ -22,20 +24,25 @@
|
||||
|
||||
#include <crypto/aes.h>
|
||||
#include <crypto/algapi.h>
|
||||
#include <crypto/ghash.h>
|
||||
#include <crypto/internal/aead.h>
|
||||
#include <crypto/internal/skcipher.h>
|
||||
#include <crypto/scatterwalk.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/cpufeature.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/fips.h>
|
||||
#include <linux/string.h>
|
||||
#include <crypto/xts.h>
|
||||
#include <asm/cpacf.h>
|
||||
|
||||
static u8 *ctrblk;
|
||||
static DEFINE_SPINLOCK(ctrblk_lock);
|
||||
|
||||
static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
|
||||
static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
|
||||
kma_functions;
|
||||
|
||||
struct s390_aes_ctx {
|
||||
u8 key[AES_MAX_KEY_SIZE];
|
||||
@ -55,6 +62,17 @@ struct s390_xts_ctx {
|
||||
struct crypto_skcipher *fallback;
|
||||
};
|
||||
|
||||
struct gcm_sg_walk {
|
||||
struct scatter_walk walk;
|
||||
unsigned int walk_bytes;
|
||||
u8 *walk_ptr;
|
||||
unsigned int walk_bytes_remain;
|
||||
u8 buf[AES_BLOCK_SIZE];
|
||||
unsigned int buf_bytes;
|
||||
u8 *ptr;
|
||||
unsigned int nbytes;
|
||||
};
|
||||
|
||||
static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
@ -771,6 +789,267 @@ static struct crypto_alg ctr_aes_alg = {
|
||||
}
|
||||
};
|
||||
|
||||
static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
|
||||
unsigned int keylen)
|
||||
{
|
||||
struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
|
||||
|
||||
switch (keylen) {
|
||||
case AES_KEYSIZE_128:
|
||||
ctx->fc = CPACF_KMA_GCM_AES_128;
|
||||
break;
|
||||
case AES_KEYSIZE_192:
|
||||
ctx->fc = CPACF_KMA_GCM_AES_192;
|
||||
break;
|
||||
case AES_KEYSIZE_256:
|
||||
ctx->fc = CPACF_KMA_GCM_AES_256;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
memcpy(ctx->key, key, keylen);
|
||||
ctx->key_len = keylen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
|
||||
{
|
||||
switch (authsize) {
|
||||
case 4:
|
||||
case 8:
|
||||
case 12:
|
||||
case 13:
|
||||
case 14:
|
||||
case 15:
|
||||
case 16:
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void gcm_sg_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
|
||||
unsigned int len)
|
||||
{
|
||||
memset(gw, 0, sizeof(*gw));
|
||||
gw->walk_bytes_remain = len;
|
||||
scatterwalk_start(&gw->walk, sg);
|
||||
}
|
||||
|
||||
static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
|
||||
{
|
||||
int n;
|
||||
|
||||
/* minbytesneeded <= AES_BLOCK_SIZE */
|
||||
if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
|
||||
gw->ptr = gw->buf;
|
||||
gw->nbytes = gw->buf_bytes;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (gw->walk_bytes_remain == 0) {
|
||||
gw->ptr = NULL;
|
||||
gw->nbytes = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
|
||||
if (!gw->walk_bytes) {
|
||||
scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
|
||||
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
|
||||
gw->walk_bytes_remain);
|
||||
}
|
||||
gw->walk_ptr = scatterwalk_map(&gw->walk);
|
||||
|
||||
if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
|
||||
gw->ptr = gw->walk_ptr;
|
||||
gw->nbytes = gw->walk_bytes;
|
||||
goto out;
|
||||
}
|
||||
|
||||
while (1) {
|
||||
n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
|
||||
memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
|
||||
gw->buf_bytes += n;
|
||||
gw->walk_bytes_remain -= n;
|
||||
scatterwalk_unmap(&gw->walk);
|
||||
scatterwalk_advance(&gw->walk, n);
|
||||
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
|
||||
|
||||
if (gw->buf_bytes >= minbytesneeded) {
|
||||
gw->ptr = gw->buf;
|
||||
gw->nbytes = gw->buf_bytes;
|
||||
goto out;
|
||||
}
|
||||
|
||||
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
|
||||
gw->walk_bytes_remain);
|
||||
if (!gw->walk_bytes) {
|
||||
scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
|
||||
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
|
||||
gw->walk_bytes_remain);
|
||||
}
|
||||
gw->walk_ptr = scatterwalk_map(&gw->walk);
|
||||
}
|
||||
|
||||
out:
|
||||
return gw->nbytes;
|
||||
}
|
||||
|
||||
static void gcm_sg_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
|
||||
{
|
||||
int n;
|
||||
|
||||
if (gw->ptr == NULL)
|
||||
return;
|
||||
|
||||
if (gw->ptr == gw->buf) {
|
||||
n = gw->buf_bytes - bytesdone;
|
||||
if (n > 0) {
|
||||
memmove(gw->buf, gw->buf + bytesdone, n);
|
||||
gw->buf_bytes -= n;
|
||||
} else
|
||||
gw->buf_bytes = 0;
|
||||
} else {
|
||||
gw->walk_bytes_remain -= bytesdone;
|
||||
scatterwalk_unmap(&gw->walk);
|
||||
scatterwalk_advance(&gw->walk, bytesdone);
|
||||
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
|
||||
}
|
||||
}
|
||||
|
||||
static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
|
||||
{
|
||||
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
|
||||
struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
|
||||
unsigned int ivsize = crypto_aead_ivsize(tfm);
|
||||
unsigned int taglen = crypto_aead_authsize(tfm);
|
||||
unsigned int aadlen = req->assoclen;
|
||||
unsigned int pclen = req->cryptlen;
|
||||
int ret = 0;
|
||||
|
||||
unsigned int len, in_bytes, out_bytes,
|
||||
min_bytes, bytes, aad_bytes, pc_bytes;
|
||||
struct gcm_sg_walk gw_in, gw_out;
|
||||
u8 tag[GHASH_DIGEST_SIZE];
|
||||
|
||||
struct {
|
||||
u32 _[3]; /* reserved */
|
||||
u32 cv; /* Counter Value */
|
||||
u8 t[GHASH_DIGEST_SIZE];/* Tag */
|
||||
u8 h[AES_BLOCK_SIZE]; /* Hash-subkey */
|
||||
u64 taadl; /* Total AAD Length */
|
||||
u64 tpcl; /* Total Plain-/Cipher-text Length */
|
||||
u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
|
||||
u8 k[AES_MAX_KEY_SIZE]; /* Key */
|
||||
} param;
|
||||
|
||||
/*
|
||||
* encrypt
|
||||
* req->src: aad||plaintext
|
||||
* req->dst: aad||ciphertext||tag
|
||||
* decrypt
|
||||
* req->src: aad||ciphertext||tag
|
||||
* req->dst: aad||plaintext, return 0 or -EBADMSG
|
||||
* aad, plaintext and ciphertext may be empty.
|
||||
*/
|
||||
if (flags & CPACF_DECRYPT)
|
||||
pclen -= taglen;
|
||||
len = aadlen + pclen;
|
||||
|
||||
memset(¶m, 0, sizeof(param));
|
||||
param.cv = 1;
|
||||
param.taadl = aadlen * 8;
|
||||
param.tpcl = pclen * 8;
|
||||
memcpy(param.j0, req->iv, ivsize);
|
||||
*(u32 *)(param.j0 + ivsize) = 1;
|
||||
memcpy(param.k, ctx->key, ctx->key_len);
|
||||
|
||||
gcm_sg_walk_start(&gw_in, req->src, len);
|
||||
gcm_sg_walk_start(&gw_out, req->dst, len);
|
||||
|
||||
do {
|
||||
min_bytes = min_t(unsigned int,
|
||||
aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
|
||||
in_bytes = gcm_sg_walk_go(&gw_in, min_bytes);
|
||||
out_bytes = gcm_sg_walk_go(&gw_out, min_bytes);
|
||||
bytes = min(in_bytes, out_bytes);
|
||||
|
||||
if (aadlen + pclen <= bytes) {
|
||||
aad_bytes = aadlen;
|
||||
pc_bytes = pclen;
|
||||
flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
|
||||
} else {
|
||||
if (aadlen <= bytes) {
|
||||
aad_bytes = aadlen;
|
||||
pc_bytes = (bytes - aadlen) &
|
||||
~(AES_BLOCK_SIZE - 1);
|
||||
flags |= CPACF_KMA_LAAD;
|
||||
} else {
|
||||
aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
|
||||
pc_bytes = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (aad_bytes > 0)
|
||||
memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
|
||||
|
||||
cpacf_kma(ctx->fc | flags, ¶m,
|
||||
gw_out.ptr + aad_bytes,
|
||||
gw_in.ptr + aad_bytes, pc_bytes,
|
||||
gw_in.ptr, aad_bytes);
|
||||
|
||||
gcm_sg_walk_done(&gw_in, aad_bytes + pc_bytes);
|
||||
gcm_sg_walk_done(&gw_out, aad_bytes + pc_bytes);
|
||||
aadlen -= aad_bytes;
|
||||
pclen -= pc_bytes;
|
||||
} while (aadlen + pclen > 0);
|
||||
|
||||
if (flags & CPACF_DECRYPT) {
|
||||
scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
|
||||
if (crypto_memneq(tag, param.t, taglen))
|
||||
ret = -EBADMSG;
|
||||
} else
|
||||
scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
|
||||
|
||||
memzero_explicit(¶m, sizeof(param));
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int gcm_aes_encrypt(struct aead_request *req)
|
||||
{
|
||||
return gcm_aes_crypt(req, CPACF_ENCRYPT);
|
||||
}
|
||||
|
||||
static int gcm_aes_decrypt(struct aead_request *req)
|
||||
{
|
||||
return gcm_aes_crypt(req, CPACF_DECRYPT);
|
||||
}
|
||||
|
||||
static struct aead_alg gcm_aes_aead = {
|
||||
.setkey = gcm_aes_setkey,
|
||||
.setauthsize = gcm_aes_setauthsize,
|
||||
.encrypt = gcm_aes_encrypt,
|
||||
.decrypt = gcm_aes_decrypt,
|
||||
|
||||
.ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
|
||||
.maxauthsize = GHASH_DIGEST_SIZE,
|
||||
.chunksize = AES_BLOCK_SIZE,
|
||||
|
||||
.base = {
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
|
||||
.cra_blocksize = 1,
|
||||
.cra_ctxsize = sizeof(struct s390_aes_ctx),
|
||||
.cra_priority = 900,
|
||||
.cra_name = "gcm(aes)",
|
||||
.cra_driver_name = "gcm-aes-s390",
|
||||
.cra_module = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static struct crypto_alg *aes_s390_algs_ptr[5];
|
||||
static int aes_s390_algs_num;
|
||||
|
||||
@ -790,16 +1069,19 @@ static void aes_s390_fini(void)
|
||||
crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
|
||||
if (ctrblk)
|
||||
free_page((unsigned long) ctrblk);
|
||||
|
||||
crypto_unregister_aead(&gcm_aes_aead);
|
||||
}
|
||||
|
||||
static int __init aes_s390_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Query available functions for KM, KMC and KMCTR */
|
||||
/* Query available functions for KM, KMC, KMCTR and KMA */
|
||||
cpacf_query(CPACF_KM, &km_functions);
|
||||
cpacf_query(CPACF_KMC, &kmc_functions);
|
||||
cpacf_query(CPACF_KMCTR, &kmctr_functions);
|
||||
cpacf_query(CPACF_KMA, &kma_functions);
|
||||
|
||||
if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
|
||||
cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
|
||||
@ -840,6 +1122,14 @@ static int __init aes_s390_init(void)
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
|
||||
cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
|
||||
cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
|
||||
ret = crypto_register_aead(&gcm_aes_aead);
|
||||
if (ret)
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
out_err:
|
||||
aes_s390_fini();
|
||||
|
||||
Loading…
Reference in New Issue
Block a user