[CRYPTO] hifn_795x: Detect weak keys

HIFN driver update to use DES weak key checks (exported in this patch).
Signed-off-by: NEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

crypto/des_generic.c

@@ -628,7 +628,7 @@ static const u32 S8[64] = {
  *   Choice 1 has operated on the key.
  *
  */
-static unsigned long ekey(u32 *pe, const u8 *k)
+unsigned long des_ekey(u32 *pe, const u8 *k)
 {
 	/* K&R: long is at least 32 bits */
 	unsigned long a, b, c, d, w;
@@ -703,6 +703,7 @@ static unsigned long ekey(u32 *pe, const u8 *k)
 	/* Zero if weak key */
 	return w;
 }
+EXPORT_SYMBOL_GPL(des_ekey);
 
 /*
  * Decryption key expansion
@@ -786,7 +787,7 @@ static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
 	int ret;
 
 	/* Expand to tmp */
-	ret = ekey(tmp, key);
+	ret = des_ekey(tmp, key);
 
 	if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
 		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
@@ -873,9 +874,9 @@ static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
 		return -EINVAL;
 	}
 
-	ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
+	des_ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
 	dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
-	ekey(expkey, key);
+	des_ekey(expkey, key);
 
 	return 0;
 }

drivers/crypto/Kconfig

@@ -85,9 +85,9 @@ config ZCRYPT_MONOLITHIC
 
 config CRYPTO_DEV_HIFN_795X
 	tristate "Driver HIFN 795x crypto accelerator chips"
+	select CRYPTO_DES
 	select CRYPTO_ALGAPI
 	select CRYPTO_ABLKCIPHER
-	select CRYPTO_BLKCIPHER
 	help
 	  This option allows you to have support for HIFN 795x crypto adapters.
 

drivers/crypto/hifn_795x.c

@@ -29,6 +29,7 @@
 #include <linux/crypto.h>
 
 #include <crypto/algapi.h>
+#include <crypto/des.h>
 
 #include <asm/kmap_types.h>
 
@@ -1924,6 +1925,16 @@ static int hifn_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 		return -1;
 	}
 
+	if (len == HIFN_DES_KEY_LENGTH) {
+		u32 tmp[DES_EXPKEY_WORDS];
+		int ret = des_ekey(tmp, key);
+		
+		if (unlikely(ret == 0) && (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
+			tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
+			return -EINVAL;
+		}
+	}
+
 	dev->flags &= ~HIFN_FLAG_OLD_KEY;
 
 	memcpy(ctx->key, key, len);