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crypto: arm64/aes - fix handling sub-block CTS-CBC inputs

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In the new arm64 CTS-CBC implementation, return an error code rather
than crashing on inputs shorter than AES_BLOCK_SIZE bytes.  Also set
cra_blocksize to AES_BLOCK_SIZE (like is done in the cts template) to
indicate the minimum input size.

Fixes: dd597fb33f ("crypto: arm64/aes-blk - add support for CTS-CBC mode")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2018-10-02 22:22:15 -07:00 committed by Herbert Xu
parent 52813ab249
commit 7ff9036a62
1 changed files with 9 additions and 4 deletions
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13
arch/arm64/crypto/aes-glue.c
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@ -243,8 +243,11 @@ static int cts_cbc_encrypt(struct skcipher_request *req)
skcipher_request_set_tfm(&rctx->subreq, tfm);
if (req->cryptlen == AES_BLOCK_SIZE)
if (req->cryptlen <= AES_BLOCK_SIZE) {
if (req->cryptlen < AES_BLOCK_SIZE)
return -EINVAL;
cbc_blocks = 1;
}
if (cbc_blocks > 0) {
unsigned int blocks;
@ -305,8 +308,11 @@ static int cts_cbc_decrypt(struct skcipher_request *req)
skcipher_request_set_tfm(&rctx->subreq, tfm);
if (req->cryptlen == AES_BLOCK_SIZE)
if (req->cryptlen <= AES_BLOCK_SIZE) {
if (req->cryptlen < AES_BLOCK_SIZE)
return -EINVAL;
cbc_blocks = 1;
}
if (cbc_blocks > 0) {
unsigned int blocks;
@ -486,14 +492,13 @@ static struct skcipher_alg aes_algs[] = { {
.cra_driver_name = "__cts-cbc-aes-" MODE,
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = 1,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.chunksize = AES_BLOCK_SIZE,
.walksize = 2 * AES_BLOCK_SIZE,
.setkey = skcipher_aes_setkey,
.encrypt = cts_cbc_encrypt,