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authorHerbert Xu <herbert@gondor.apana.org.au>2019-04-11 11:50:56 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-04-18 17:14:58 +0300
commitd7198ce46d10712b6fdd66e35237d7d0d51afcd6 (patch)
tree786ec13831f3e366c6612b85a3a4a8818c8bed71 /crypto
parent694e0db6600c12f8172efb51cd4b4bbade958562 (diff)
downloadlinux-d7198ce46d10712b6fdd66e35237d7d0d51afcd6.tar.xz
crypto: des_generic - Forbid 2-key in 3DES and add helpers
This patch adds a requirement to the generic 3DES implementation such that 2-key 3DES (K1 == K3) is no longer allowed in FIPS mode. We will also provide helpers that may be used by drivers that implement 3DES to make the same check. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/des_generic.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/crypto/des_generic.c b/crypto/des_generic.c
index 1e6621665dd9..ebec1fb08c45 100644
--- a/crypto/des_generic.c
+++ b/crypto/des_generic.c
@@ -862,14 +862,11 @@ static void des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key,
unsigned int keylen)
{
- const u32 *K = (const u32 *)key;
+ 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_ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;