path: root/include
diff options
authorEric Biggers <ebiggers@google.com>2019-12-30 21:19:36 -0600
committerHerbert Xu <herbert@gondor.apana.org.au>2020-01-09 11:30:53 +0800
commit674f368a952c48ede71784935a799a5205b92b6c (patch)
treee8610dafbeb92ae5f91d53579e071e8ff58303e4 /include
parentcrypto: remove CRYPTO_TFM_RES_BAD_BLOCK_LEN (diff)
The CRYPTO_TFM_RES_BAD_KEY_LEN flag was apparently meant as a way to make the ->setkey() functions provide more information about errors. However, no one actually checks for this flag, which makes it pointless. Also, many algorithms fail to set this flag when given a bad length key. Reviewing just the generic implementations, this is the case for aes-fixed-time, cbcmac, echainiv, nhpoly1305, pcrypt, rfc3686, rfc4309, rfc7539, rfc7539esp, salsa20, seqiv, and xcbc. But there are probably many more in arch/*/crypto/ and drivers/crypto/. Some algorithms can even set this flag when the key is the correct length. For example, authenc and authencesn set it when the key payload is malformed in any way (not just a bad length), the atmel-sha and ccree drivers can set it if a memory allocation fails, and the chelsio driver sets it for bad auth tag lengths, not just bad key lengths. So even if someone actually wanted to start checking this flag (which seems unlikely, since it's been unused for a long time), there would be a lot of work needed to get it working correctly. But it would probably be much better to go back to the drawing board and just define different return values, like -EINVAL if the key is invalid for the algorithm vs. -EKEYREJECTED if the key was rejected by a policy like "no weak keys". That would be much simpler, less error-prone, and easier to test. So just remove this flag. Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Horia Geantă <horia.geanta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include')
5 files changed, 6 insertions, 16 deletions
diff --git a/include/crypto/cast6.h b/include/crypto/cast6.h
index 4c8d0c72f78d..38f490cd50a8 100644
--- a/include/crypto/cast6.h
+++ b/include/crypto/cast6.h
@@ -15,8 +15,7 @@ struct cast6_ctx {
u8 Kr[12][4];
-int __cast6_setkey(struct cast6_ctx *ctx, const u8 *key,
- unsigned int keylen, u32 *flags);
+int __cast6_setkey(struct cast6_ctx *ctx, const u8 *key, unsigned int keylen);
int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen);
void __cast6_encrypt(const void *ctx, u8 *dst, const u8 *src);
diff --git a/include/crypto/internal/des.h b/include/crypto/internal/des.h
index f62a2bb1866b..355ddaae3806 100644
--- a/include/crypto/internal/des.h
+++ b/include/crypto/internal/des.h
@@ -120,20 +120,16 @@ static inline int verify_skcipher_des3_key(struct crypto_skcipher *tfm,
static inline int verify_aead_des_key(struct crypto_aead *tfm, const u8 *key,
int keylen)
- if (keylen != DES_KEY_SIZE) {
- crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ if (keylen != DES_KEY_SIZE)
return -EINVAL;
- }
return crypto_des_verify_key(crypto_aead_tfm(tfm), key);
static inline int verify_aead_des3_key(struct crypto_aead *tfm, const u8 *key,
int keylen)
- if (keylen != DES3_EDE_KEY_SIZE) {
- crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ if (keylen != DES3_EDE_KEY_SIZE)
return -EINVAL;
- }
return crypto_des3_ede_verify_key(crypto_aead_tfm(tfm), key);
diff --git a/include/crypto/twofish.h b/include/crypto/twofish.h
index 2e2c09673d88..f6b307a58554 100644
--- a/include/crypto/twofish.h
+++ b/include/crypto/twofish.h
@@ -19,7 +19,7 @@ struct twofish_ctx {
int __twofish_setkey(struct twofish_ctx *ctx, const u8 *key,
- unsigned int key_len, u32 *flags);
+ unsigned int key_len);
int twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len);
diff --git a/include/crypto/xts.h b/include/crypto/xts.h
index 15ae7fdc0478..57b2c52928db 100644
--- a/include/crypto/xts.h
+++ b/include/crypto/xts.h
@@ -17,10 +17,8 @@ static inline int xts_check_key(struct crypto_tfm *tfm,
* key consists of keys of equal size concatenated, therefore
* the length must be even.
- if (keylen % 2) {
+ if (keylen % 2)
return -EINVAL;
- }
/* ensure that the AES and tweak key are not identical */
if (fips_enabled &&
@@ -39,10 +37,8 @@ static inline int xts_verify_key(struct crypto_skcipher *tfm,
* key consists of keys of equal size concatenated, therefore
* the length must be even.
- if (keylen % 2) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ if (keylen % 2)
return -EINVAL;
- }
/* ensure that the AES and tweak key are not identical */
if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 719a301af3f2..61fccc7d0efb 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -113,7 +113,6 @@
#define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
#define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400
#define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
-#define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000
* Miscellaneous stuff.