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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-08-18 12:59:46 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-08-29 11:05:09 +0200
commit69c0e360f990c2dc737681f40a361195066cef02 (patch)
treee5e5ff1ff6f09e21b28752b948283589803d81eb /arch/s390/crypto/des_s390.c
parentd863d5945f2be0abfcd9d36b1a7c605f3eaef517 (diff)
s390/crypto: cpacf function detection
The CPACF code makes some assumptions about the availablity of hardware support. E.g. if the machine supports KM(AES-256) without chaining it is assumed that KMC(AES-256) with chaining is available as well. For the existing CPUs this is true but the architecturally correct way is to check each CPACF functions on its own. This is what the query function of each instructions is all about. Reviewed-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/crypto/des_s390.c')
-rw-r--r--arch/s390/crypto/des_s390.c77
1 files changed, 46 insertions, 31 deletions
diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c
index b77a546f1e76..965587eefc39 100644
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -27,6 +27,8 @@
static u8 *ctrblk;
static DEFINE_SPINLOCK(ctrblk_lock);
+static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
+
struct s390_des_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_KEY_SIZE];
@@ -36,12 +38,12 @@ static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int key_len)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
- u32 *flags = &tfm->crt_flags;
u32 tmp[DES_EXPKEY_WORDS];
/* check for weak keys */
- if (!des_ekey(tmp, key) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
- *flags |= CRYPTO_TFM_RES_WEAK_KEY;
+ if (!des_ekey(tmp, key) &&
+ (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
+ tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
@@ -238,13 +240,12 @@ static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int key_len)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
- u32 *flags = &tfm->crt_flags;
if (!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
DES_KEY_SIZE)) &&
- (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
- *flags |= CRYPTO_TFM_RES_WEAK_KEY;
+ (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
+ tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
memcpy(ctx->key, key, key_len);
@@ -554,39 +555,53 @@ static int __init des_s390_init(void)
{
int ret;
- if (!cpacf_query(CPACF_KM, CPACF_KM_DEA) ||
- !cpacf_query(CPACF_KM, CPACF_KM_TDEA_192))
- return -EOPNOTSUPP;
-
- ret = des_s390_register_alg(&des_alg);
- if (ret)
- goto out_err;
- ret = des_s390_register_alg(&ecb_des_alg);
- if (ret)
- goto out_err;
- ret = des_s390_register_alg(&cbc_des_alg);
- if (ret)
- goto out_err;
- ret = des_s390_register_alg(&des3_alg);
- if (ret)
- goto out_err;
- ret = des_s390_register_alg(&ecb_des3_alg);
- if (ret)
- goto out_err;
- ret = des_s390_register_alg(&cbc_des3_alg);
- if (ret)
- goto out_err;
-
- if (cpacf_query(CPACF_KMCTR, CPACF_KMCTR_DEA) &&
- cpacf_query(CPACF_KMCTR, CPACF_KMCTR_TDEA_192)) {
+ /* Query available functions for KM, KMC and KMCTR */
+ cpacf_query(CPACF_KM, &km_functions);
+ cpacf_query(CPACF_KMC, &kmc_functions);
+ cpacf_query(CPACF_KMCTR, &kmctr_functions);
+
+ if (cpacf_test_func(&km_functions, CPACF_KM_DEA)) {
+ ret = des_s390_register_alg(&des_alg);
+ if (ret)
+ goto out_err;
+ ret = des_s390_register_alg(&ecb_des_alg);
+ if (ret)
+ goto out_err;
+ }
+ if (cpacf_test_func(&kmc_functions, CPACF_KMC_DEA)) {
+ ret = des_s390_register_alg(&cbc_des_alg);
+ if (ret)
+ goto out_err;
+ }
+ if (cpacf_test_func(&km_functions, CPACF_KM_TDEA_192)) {
+ ret = des_s390_register_alg(&des3_alg);
+ if (ret)
+ goto out_err;
+ ret = des_s390_register_alg(&ecb_des3_alg);
+ if (ret)
+ goto out_err;
+ }
+ if (cpacf_test_func(&kmc_functions, CPACF_KMC_TDEA_192)) {
+ ret = des_s390_register_alg(&cbc_des3_alg);
+ if (ret)
+ goto out_err;
+ }
+
+ if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA) ||
+ cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;
goto out_err;
}
+ }
+
+ if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA)) {
ret = des_s390_register_alg(&ctr_des_alg);
if (ret)
goto out_err;
+ }
+ if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
ret = des_s390_register_alg(&ctr_des3_alg);
if (ret)
goto out_err;