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

Message ID E1hEVQA-0006li-Ty@gondobar (mailing list archive)
State Accepted
Delegated to: Herbert Xu
Headers show
Series Forbid 2-key 3DES in FIPS mode | expand

Commit Message

Herbert Xu April 11, 2019, 8:50 a.m. UTC 
This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.
   
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

 arch/sparc/crypto/des_glue.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)
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Patch

diff --git a/arch/sparc/crypto/des_glue.c b/arch/sparc/crypto/des_glue.c
index 4884315daff4..453a4cf5492a 100644
--- a/arch/sparc/crypto/des_glue.c
+++ b/arch/sparc/crypto/des_glue.c
@@ -201,18 +201,15 @@  static int des3_ede_set_key(struct crypto_tfm *tfm, const u8 *key,
 			    unsigned int keylen)
 {
 	struct des3_ede_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
-	const u32 *K = (const u32 *)key;
 	u32 *flags = &tfm->crt_flags;
 	u64 k1[DES_EXPKEY_WORDS / 2];
 	u64 k2[DES_EXPKEY_WORDS / 2];
 	u64 k3[DES_EXPKEY_WORDS / 2];
+	int err;
 
-	if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
-		     !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
-		     (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
-		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
-		return -EINVAL;
-	}
+	err = __des3_verify_key(flags, key);
+	if (unlikely(err))
+		return err;
 
 	des_sparc64_key_expand((const u32 *)key, k1);
 	key += DES_KEY_SIZE;