You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
3.5 KiB
103 lines
3.5 KiB
![]()
6 years ago
|
From 584201f1895d915c1aa523bc86afdc126e94beca Mon Sep 17 00:00:00 2001
|
||
|
From: Christian Lamparter <chunkeey@gmail.com>
|
||
|
Date: Thu, 19 Apr 2018 18:41:56 +0200
|
||
|
Subject: [PATCH 7/8] crypto: crypto4xx - extend aead fallback checks
|
||
|
|
||
|
1020 bytes is the limit for associated data. Any more
|
||
|
and it will no longer fit into hash_crypto_offset anymore.
|
||
|
|
||
|
The hardware will not process aead requests with plaintext
|
||
|
that have less than AES_BLOCK_SIZE bytes. When decrypting
|
||
|
aead requests the authsize has to be taken in account as
|
||
|
well, as it is part of the cryptlen. Otherwise the hardware
|
||
|
will think it has been misconfigured and will return:
|
||
|
|
||
|
aead return err status = 0x98
|
||
|
|
||
|
For rtc4543(gcm(aes)), the hardware has a dedicated GMAC
|
||
|
mode as part of the hash function set.
|
||
|
|
||
|
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
|
||
|
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
|
||
|
---
|
||
|
drivers/crypto/amcc/crypto4xx_alg.c | 30 +++++++++++++++--------------
|
||
|
1 file changed, 16 insertions(+), 14 deletions(-)
|
||
|
|
||
|
--- a/drivers/crypto/amcc/crypto4xx_alg.c
|
||
|
+++ b/drivers/crypto/amcc/crypto4xx_alg.c
|
||
|
@@ -321,6 +321,7 @@ int crypto4xx_decrypt_ctr(struct skciphe
|
||
|
}
|
||
|
|
||
|
static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
|
||
|
+ unsigned int len,
|
||
|
bool is_ccm, bool decrypt)
|
||
|
{
|
||
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
||
|
@@ -330,14 +331,14 @@ static inline bool crypto4xx_aead_need_f
|
||
|
return true;
|
||
|
|
||
|
/*
|
||
|
- * hardware does not handle cases where cryptlen
|
||
|
- * is less than a block
|
||
|
+ * hardware does not handle cases where plaintext
|
||
|
+ * is less than a block.
|
||
|
*/
|
||
|
- if (req->cryptlen < AES_BLOCK_SIZE)
|
||
|
+ if (len < AES_BLOCK_SIZE)
|
||
|
return true;
|
||
|
|
||
|
- /* assoc len needs to be a multiple of 4 */
|
||
|
- if (req->assoclen & 0x3)
|
||
|
+ /* assoc len needs to be a multiple of 4 and <= 1020 */
|
||
|
+ if (req->assoclen & 0x3 || req->assoclen > 1020)
|
||
|
return true;
|
||
|
|
||
|
/* CCM supports only counter field length of 2 and 4 bytes */
|
||
|
@@ -449,17 +450,17 @@ static int crypto4xx_crypt_aes_ccm(struc
|
||
|
{
|
||
|
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
|
||
|
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
||
|
- unsigned int len = req->cryptlen;
|
||
|
__le32 iv[16];
|
||
|
u32 tmp_sa[SA_AES128_CCM_LEN + 4];
|
||
|
struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
|
||
|
-
|
||
|
- if (crypto4xx_aead_need_fallback(req, true, decrypt))
|
||
|
- return crypto4xx_aead_fallback(req, ctx, decrypt);
|
||
|
+ unsigned int len = req->cryptlen;
|
||
|
|
||
|
if (decrypt)
|
||
|
len -= crypto_aead_authsize(aead);
|
||
|
|
||
|
+ if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
|
||
|
+ return crypto4xx_aead_fallback(req, ctx, decrypt);
|
||
|
+
|
||
|
memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
|
||
|
sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
|
||
|
|
||
|
@@ -605,18 +606,19 @@ static inline int crypto4xx_crypt_aes_gc
|
||
|
bool decrypt)
|
||
|
{
|
||
|
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
|
||
|
- unsigned int len = req->cryptlen;
|
||
|
+ struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
|
||
|
__le32 iv[4];
|
||
|
+ unsigned int len = req->cryptlen;
|
||
|
+
|
||
|
+ if (decrypt)
|
||
|
+ len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
|
||
|
|
||
|
- if (crypto4xx_aead_need_fallback(req, false, decrypt))
|
||
|
+ if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
|
||
|
return crypto4xx_aead_fallback(req, ctx, decrypt);
|
||
|
|
||
|
crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
|
||
|
iv[3] = cpu_to_le32(1);
|
||
|
|
||
|
- if (decrypt)
|
||
|
- len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
|
||
|
-
|
||
|
return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
|
||
|
len, iv, sizeof(iv),
|
||
|
decrypt ? ctx->sa_in : ctx->sa_out,
|