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crypto: mediatek - add mtk_aes_gcm_tag_verify()

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This patch adds mtk_aes_gcm_tag_verify() which is used to compare
authenticated tag.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ryder Lee 2017-03-09 10:11:18 +08:00 committed by Herbert Xu
parent 5041d714fc
commit 98b10235f3
2 changed files with 24 additions and 2 deletions
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24
drivers/crypto/mediatek/mtk-aes.c
View File

@ -70,6 +70,8 @@
#define AES_FLAGS_ENCRYPT BIT(4)
#define AES_FLAGS_BUSY BIT(5)
#define AES_AUTH_TAG_ERR cpu_to_le32(BIT(26))
/**
* Command token(CT) is a set of hardware instructions that
* are used to control engine's processing flow of AES.
@ -306,6 +308,9 @@ static int mtk_aes_xmit(struct mtk_cryp *cryp, struct mtk_aes_rec *aes)
}
res->hdr |= MTK_DESC_LAST;
/* Pointer to current result descriptor */
ring->res_prev = res;
/* Prepare enough space for authenticated tag */
if (aes->flags & AES_FLAGS_GCM)
res->hdr += AES_BLOCK_SIZE;
@ -799,6 +804,19 @@ mtk_aes_gcm_ctx_cast(struct mtk_aes_base_ctx *ctx)
return container_of(ctx, struct mtk_aes_gcm_ctx, base);
}
/*
* Engine will verify and compare tag automatically, so we just need
* to check returned status which stored in the result descriptor.
*/
static int mtk_aes_gcm_tag_verify(struct mtk_cryp *cryp,
struct mtk_aes_rec *aes)
{
u32 status = cryp->ring[aes->id]->res_prev->ct;
return mtk_aes_complete(cryp, aes, (status & AES_AUTH_TAG_ERR) ?
-EBADMSG : 0);
}
/* Initialize transform information of GCM mode */
static void mtk_aes_gcm_info_init(struct mtk_cryp *cryp,
struct mtk_aes_rec *aes,
@ -902,6 +920,8 @@ static int mtk_aes_gcm_start(struct mtk_cryp *cryp, struct mtk_aes_rec *aes)
if (aes->flags & AES_FLAGS_ENCRYPT) {
u32 tag[4];
aes->resume = mtk_aes_transfer_complete;
/* Compute total process length. */
aes->total = len + gctx->authsize;
/* Compute text length. */
@ -909,10 +929,10 @@ static int mtk_aes_gcm_start(struct mtk_cryp *cryp, struct mtk_aes_rec *aes)
/* Hardware will append authenticated tag to output buffer */
scatterwalk_map_and_copy(tag, req->dst, len, gctx->authsize, 1);
} else {
aes->resume = mtk_aes_gcm_tag_verify;
aes->total = len;
gctx->textlen = req->cryptlen - gctx->authsize;
}
aes->resume = mtk_aes_transfer_complete;
return mtk_aes_gcm_dma(cryp, aes, req->src, req->dst, len);
}
@ -925,7 +945,7 @@ static int mtk_aes_gcm_crypt(struct aead_request *req, u64 mode)
rctx->mode = AES_FLAGS_GCM | mode;
return mtk_aes_handle_queue(ctx->cryp, !!(mode & AES_FLAGS_ENCRYPT),
&req->base);
&req->base);
}
static void mtk_gcm_setkey_done(struct crypto_async_request *req, int err)

2
drivers/crypto/mediatek/mtk-platform.h
View File

@ -88,6 +88,7 @@ struct mtk_desc {
* @cmd_dma: DMA address of command descriptor ring
* @res_base: pointer to result descriptor ring base
* @res_next: pointer to the next result descriptor
* @res_prev: pointer to the previous result descriptor
* @res_dma: DMA address of result descriptor ring
*
* A descriptor ring is a circular buffer that is used to manage
@ -100,6 +101,7 @@ struct mtk_ring {
dma_addr_t cmd_dma;
struct mtk_desc *res_base;
struct mtk_desc *res_next;
struct mtk_desc *res_prev;
dma_addr_t res_dma;
};