crypto: mediatek - fix incorrect crypto key setting

Record crypto key to context during setkey and set the key to
transform state buffer in encrypt/decrypt process.
Signed-off-by: Vic Wu <vic.wu@mediatek.com>
Tested-by: John Crispin <john@phrozen.og>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/mediatek/mtk-aes.c

@@ -105,6 +105,7 @@ struct mtk_aes_reqctx {
 struct mtk_aes_base_ctx {
 	struct mtk_cryp *cryp;
 	u32 keylen;
+	__le32 key[12];
 	__le32 keymode;
 
 	mtk_aes_fn start;
@@ -534,6 +535,8 @@ static int mtk_aes_handle_queue(struct mtk_cryp *cryp, u8 id,
 		backlog->complete(backlog, -EINPROGRESS);
 
 	ctx = crypto_tfm_ctx(areq->tfm);
+	/* Write key into state buffer */
+	memcpy(ctx->info.state, ctx->key, sizeof(ctx->key));
 
 	aes->areq = areq;
 	aes->ctx = ctx;
@@ -653,7 +656,7 @@ static int mtk_aes_setkey(struct crypto_ablkcipher *tfm,
 	}
 
 	ctx->keylen = SIZE_IN_WORDS(keylen);
-	mtk_aes_write_state_le(ctx->info.state, (const u32 *)key, keylen);
+	mtk_aes_write_state_le(ctx->key, (const u32 *)key, keylen);
 
 	return 0;
 }
@@ -1070,10 +1073,8 @@ static int mtk_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
 	if (err)
 		goto out;
 
-	/* Write key into state buffer */
-	mtk_aes_write_state_le(ctx->info.state, (const u32 *)key, keylen);
-	/* Write key(H) into state buffer */
-	mtk_aes_write_state_be(ctx->info.state + ctx->keylen, data->hash,
+	mtk_aes_write_state_le(ctx->key, (const u32 *)key, keylen);
+	mtk_aes_write_state_be(ctx->key + ctx->keylen, data->hash,
 			       AES_BLOCK_SIZE);
 out:
 	kzfree(data);