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From 0138c3c13809250338d7cfba6f4ca3b2da02b2c8 Mon Sep 17 00:00:00 2001
From: Eneas U de Queiroz <cotequeiroz@gmail.com>
Date: Thu, 21 Nov 2019 14:28:23 -0300
Subject: [PATCH] crypto: qce - fix xts-aes-qce key sizes
XTS-mode uses two keys, so the keysizes should be doubled in
skcipher_def, and halved when checking if it is AES-128/192/256.
Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -168,7 +168,7 @@ static int qce_skcipher_setkey(struct cr
return -EINVAL;
if (IS_AES(flags)) {
- switch (keylen) {
+ switch (IS_XTS(flags) ? keylen >> 1 : keylen) {
case AES_KEYSIZE_128:
case AES_KEYSIZE_256:
break;
@@ -203,13 +203,15 @@ static int qce_skcipher_crypt(struct skc
struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
+ int keylen;
int ret;
rctx->flags = tmpl->alg_flags;
rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
+ keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
- if (IS_AES(rctx->flags) && ctx->enc_keylen != AES_KEYSIZE_128 &&
- ctx->enc_keylen != AES_KEYSIZE_256) {
+ if (IS_AES(rctx->flags) && keylen != AES_KEYSIZE_128 &&
+ keylen != AES_KEYSIZE_256) {
SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
skcipher_request_set_tfm(subreq, ctx->fallback);
@@ -302,8 +304,8 @@ static const struct qce_skcipher_def skc
.drv_name = "xts-aes-qce",
.blocksize = AES_BLOCK_SIZE,
.ivsize = AES_BLOCK_SIZE,
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
+ .min_keysize = AES_MIN_KEY_SIZE * 2,
+ .max_keysize = AES_MAX_KEY_SIZE * 2,
},
{
.flags = QCE_ALG_DES | QCE_MODE_ECB,
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