diff options
| author | Matthew Rosato <mjrosato@linux.vnet.ibm.com> | 2016-12-15 14:54:30 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-01-31 10:46:02 +0100 |
| commit | f3d3584faf29e8901e00794f4e5f770b9f1eb7a6 (patch) | |
| tree | 344a325f027c62ce1bb0aba45a32651bf5959568 /arch/s390/crypto | |
| parent | 9437964885f84cd0c584e2d30ffbf7a5a84b77e4 (diff) | |
s390/crypto: Check des3_ede keys for uniqueness in fips mode
Triple-DES implementations will soon be required to check
for uniqueness of keys with fips mode enabled. Add checks
to ensure none of the 3 keys match.
Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/crypto')
| -rw-r--r-- | arch/s390/crypto/des_s390.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c index 8b83144206eb..0d296662bbf0 100644 --- a/arch/s390/crypto/des_s390.c +++ b/arch/s390/crypto/des_s390.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/cpufeature.h> #include <linux/crypto.h> +#include <linux/fips.h> #include <crypto/algapi.h> #include <crypto/des.h> #include <asm/cpacf.h> @@ -221,6 +222,8 @@ static struct crypto_alg cbc_des_alg = { * same as DES. Implementers MUST reject keys that exhibit this * property. * + * In fips mode additinally check for all 3 keys are unique. + * */ static int des3_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len) @@ -234,6 +237,17 @@ static int des3_setkey(struct crypto_tfm *tfm, const u8 *key, tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY; return -EINVAL; } + + /* in fips mode, ensure k1 != k2 and k2 != k3 and k1 != k3 */ + if (fips_enabled && + !(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) && + crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2], + DES_KEY_SIZE) && + crypto_memneq(key, &key[DES_KEY_SIZE * 2], DES_KEY_SIZE))) { + tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY; + return -EINVAL; + } + memcpy(ctx->key, key, key_len); return 0; } |