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Subject[PATCH v5 03/11] crypto: qce: skcipher: Return unsupported if key1 and key 2 are same for AES XTS algorithm
Date
Crypto engine does not support key1 = key2 for AES XTS algorithm; the
operation hangs the engines. Return -EINVAL in case key1 and key2 are the
same.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---
drivers/crypto/qce/skcipher.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index a2d3da0ad95f..12955dcd53dd 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -167,16 +167,33 @@ static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key,
struct crypto_tfm *tfm = crypto_skcipher_tfm(ablk);
struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
unsigned long flags = to_cipher_tmpl(ablk)->alg_flags;
+ unsigned int __keylen;
int ret;

if (!key || !keylen)
return -EINVAL;

- switch (IS_XTS(flags) ? keylen >> 1 : keylen) {
+ /*
+ * AES XTS key1 = key2 not supported by crypto engine.
+ * Revisit to request a fallback cipher in this case.
+ */
+ if (IS_XTS(flags)) {
+ __keylen = keylen >> 1;
+ if (!memcmp(key, key + __keylen, __keylen))
+ return -ENOKEY;
+ } else {
+ __keylen = keylen;
+ }
+
+ switch (__keylen) {
case AES_KEYSIZE_128:
case AES_KEYSIZE_256:
memcpy(ctx->enc_key, key, keylen);
break;
+ case AES_KEYSIZE_192:
+ break;
+ default:
+ return -EINVAL;
}

ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
--
2.25.1
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