[PATCH 2/24] crypto: s390 - Forbid 2-key 3DES in FIPS mode

[Herbert Xu]

This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.
   
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
---

 arch/s390/crypto/des_s390.c |   21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c
index 0d15383d0ff1..1f9ab24dc048 100644
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -224,24 +224,11 @@ static int des3_setkey(struct crypto_tfm *tfm, const u8 
*key,
                       unsigned int key_len)
 {
        struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
+       int err;
 
-       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)) &&
-           (tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
-               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;
-       }
+       err = __des3_verify_key(&tfm->crt_flags, key);
+       if (unlikely(err))
+               return err;
 
        memcpy(ctx->key, key, key_len);
        return 0;