crypto: stm32/cryp - add weak key check for DES

Add weak key test for des functions calling the generic
des_ekey.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/stm32/Kconfig b/drivers/crypto/stm32/Kconfig
index 63aa78c..4491e21 100644 (file)
--- a/drivers/crypto/stm32/Kconfig
+++ b/drivers/crypto/stm32/Kconfig
@@ -24,6 +24,7 @@ config CRYPTO_DEV_STM32_CRYP
        depends on ARCH_STM32
        select CRYPTO_HASH
        select CRYPTO_ENGINE
+       select CRYPTO_DES
        help
           This enables support for the CRYP (AES/DES/TDES) hw accelerator which
          can be found on STMicroelectronics STM32 SOC.

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index 5785f3e..cfcb640 100644 (file)
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -753,10 +753,19 @@ static int stm32_cryp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 static int stm32_cryp_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
                                 unsigned int keylen)
 {
+       u32 tmp[DES_EXPKEY_WORDS];
+
        if (keylen != DES_KEY_SIZE)
                return -EINVAL;
-       else
-               return stm32_cryp_setkey(tfm, key, keylen);
+
+       if ((crypto_ablkcipher_get_flags(tfm) &
+            CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) &&
+           unlikely(!des_ekey(tmp, key))) {
+               crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
+               return -EINVAL;
+       }
+
+       return stm32_cryp_setkey(tfm, key, keylen);
 }
 
 static int stm32_cryp_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,