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authorTero Kristo <t-kristo@ti.com>2017-05-24 10:35:24 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2017-06-10 07:04:14 +0300
commita636fdce55c6ad12b07436424ceffad1045714db (patch)
tree00923fcec0914633ec6c462778f085012892b1b1 /drivers/crypto/omap-des.c
parent619ce700583f0f193bfb1487ca393b8ad2141a9a (diff)
downloadlinux-a636fdce55c6ad12b07436424ceffad1045714db.tar.xz
crypto: omap-des - add check for weak keys
OMAP DES crypto accelerator itself is unable to detect weak keys, so add a specific call to the generic des driver to check the key strength if requested. Signed-off-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/omap-des.c')
-rw-r--r--drivers/crypto/omap-des.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index a6f65532fd16..0d68f77ea53a 100644
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -699,16 +699,28 @@ static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode)
/* ********************** ALG API ************************************ */
-static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+static int omap_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
unsigned int keylen)
{
- struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+ struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+ struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
return -EINVAL;
pr_debug("enter, keylen: %d\n", keylen);
+ /* Do we need to test against weak key? */
+ if (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY) {
+ u32 tmp[DES_EXPKEY_WORDS];
+ int ret = des_ekey(tmp, key);
+
+ if (!ret) {
+ tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
+ return -EINVAL;
+ }
+ }
+
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;