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crypto: inside-secure - Added support for CRC32 

This patch adds support for the CRC32 "hash" algorithm

Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Pascal van Leeuwen 2019-09-09 13:10:29 +02:00 committed by Herbert Xu
parent 54ecb8f702
commit a7cf865846
3 changed files with 111 additions and 7 deletions
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1
drivers/crypto/inside-secure/safexcel.c
View File

@ -1169,6 +1169,7 @@ static struct safexcel_alg_template *safexcel_algs[] = {
&safexcel_alg_xts_aes,
&safexcel_alg_gcm,
&safexcel_alg_ccm,
&safexcel_alg_crc32,
};
static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)

2
drivers/crypto/inside-secure/safexcel.h
View File

@ -362,6 +362,7 @@ struct safexcel_context_record {
#define CONTEXT_CONTROL_DIGEST_XCM (0x2 << 21)
#define CONTEXT_CONTROL_DIGEST_HMAC (0x3 << 21)
#define CONTEXT_CONTROL_CRYPTO_ALG_MD5 (0x0 << 23)
#define CONTEXT_CONTROL_CRYPTO_ALG_CRC32 (0x0 << 23)
#define CONTEXT_CONTROL_CRYPTO_ALG_SHA1 (0x2 << 23)
#define CONTEXT_CONTROL_CRYPTO_ALG_SHA224 (0x4 << 23)
#define CONTEXT_CONTROL_CRYPTO_ALG_SHA256 (0x3 << 23)
@ -853,5 +854,6 @@ extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha512_ctr_aes;
extern struct safexcel_alg_template safexcel_alg_xts_aes;
extern struct safexcel_alg_template safexcel_alg_gcm;
extern struct safexcel_alg_template safexcel_alg_ccm;
extern struct safexcel_alg_template safexcel_alg_crc32;
#endif

115
drivers/crypto/inside-secure/safexcel_hash.c
View File

@ -82,23 +82,31 @@ static void safexcel_context_control(struct safexcel_ahash_ctx *ctx,
struct safexcel_crypto_priv *priv = ctx->priv;
u64 count = 0;
cdesc->control_data.control0 |= ctx->alg;
cdesc->control_data.control0 = ctx->alg;
/*
* Copy the input digest if needed, and setup the context
* fields. Do this now as we need it to setup the first command
* descriptor.
*/
if (!req->processed) {
if (unlikely(req->digest == CONTEXT_CONTROL_DIGEST_XCM)) {
ctx->base.ctxr->data[0] = req->state[0];
cdesc->control_data.control0 |= req->digest |
CONTEXT_CONTROL_TYPE_HASH_OUT |
CONTEXT_CONTROL_SIZE(4);
return;
} else if (!req->processed) {
/* First - and possibly only - block of basic hash only */
if (req->finish) {
cdesc->control_data.control0 |=
cdesc->control_data.control0 |= req->digest |
CONTEXT_CONTROL_TYPE_HASH_OUT |
CONTEXT_CONTROL_RESTART_HASH |
/* ensure its not 0! */
CONTEXT_CONTROL_SIZE(1);
} else {
cdesc->control_data.control0 |=
cdesc->control_data.control0 |= req->digest |
CONTEXT_CONTROL_TYPE_HASH_OUT |
CONTEXT_CONTROL_RESTART_HASH |
CONTEXT_CONTROL_NO_FINISH_HASH |
@ -238,8 +246,13 @@ static int safexcel_handle_req_result(struct safexcel_crypto_priv *priv,
return 1;
}
memcpy(areq->result, sreq->state,
crypto_ahash_digestsize(ahash));
if (unlikely(sreq->digest == CONTEXT_CONTROL_DIGEST_XCM)) {
/* Undo final XOR with 0xffffffff ...*/
*(u32 *)areq->result = ~sreq->state[0];
} else {
memcpy(areq->result, sreq->state,
crypto_ahash_digestsize(ahash));
}
}
cache_len = safexcel_queued_len(sreq);
@ -599,7 +612,7 @@ static int safexcel_ahash_enqueue(struct ahash_request *areq)
/* invalidate for HMAC continuation finish */
(req->finish && (req->processed != req->block_sz)) ||
/* invalidate for HMAC finish with odigest changed */
(req->finish &&
(req->finish && req->hmac &&
memcmp(ctx->base.ctxr->data + (req->state_sz>>2),
ctx->opad, req->state_sz))))
/*
@ -692,6 +705,12 @@ static int safexcel_ahash_final(struct ahash_request *areq)
memcpy(areq->result, sha512_zero_message_hash,
SHA512_DIGEST_SIZE);
return 0;
} else if (unlikely(req->digest == CONTEXT_CONTROL_DIGEST_XCM &&
ctx->alg == CONTEXT_CONTROL_CRYPTO_ALG_MD5 &&
req->len == sizeof(u32) && !areq->nbytes)) {
/* Zero length CRC32 */
memcpy(areq->result, ctx->ipad, sizeof(u32));
return 0;
} else if (unlikely(req->hmac &&
(req->len == req->block_sz) &&
@ -1740,3 +1759,85 @@ struct safexcel_alg_template safexcel_alg_hmac_md5 = {
},
},
};
static int safexcel_crc32_cra_init(struct crypto_tfm *tfm)
{
struct safexcel_ahash_ctx *ctx = crypto_tfm_ctx(tfm);
int ret = safexcel_ahash_cra_init(tfm);
/* Default 'key' is all zeroes */
memset(ctx->ipad, 0, sizeof(u32));
return ret;
}
static int safexcel_crc32_init(struct ahash_request *areq)
{
struct safexcel_ahash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(areq));
struct safexcel_ahash_req *req = ahash_request_ctx(areq);
memset(req, 0, sizeof(*req));
/* Start from loaded key */
req->state[0] = cpu_to_le32(~ctx->ipad[0]);
/* Set processed to non-zero to enable invalidation detection */
req->len = sizeof(u32);
req->processed = sizeof(u32);
ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_CRC32;
req->digest = CONTEXT_CONTROL_DIGEST_XCM;
req->state_sz = sizeof(u32);
req->block_sz = sizeof(u32);
return 0;
}
static int safexcel_crc32_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
struct safexcel_ahash_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
if (keylen != sizeof(u32)) {
crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
memcpy(ctx->ipad, key, sizeof(u32));
return 0;
}
static int safexcel_crc32_digest(struct ahash_request *areq)
{
return safexcel_crc32_init(areq) ?: safexcel_ahash_finup(areq);
}
struct safexcel_alg_template safexcel_alg_crc32 = {
.type = SAFEXCEL_ALG_TYPE_AHASH,
.algo_mask = 0,
.alg.ahash = {
.init = safexcel_crc32_init,
.update = safexcel_ahash_update,
.final = safexcel_ahash_final,
.finup = safexcel_ahash_finup,
.digest = safexcel_crc32_digest,
.setkey = safexcel_crc32_setkey,
.export = safexcel_ahash_export,
.import = safexcel_ahash_import,
.halg = {
.digestsize = sizeof(u32),
.statesize = sizeof(struct safexcel_ahash_export_state),
.base = {
.cra_name = "crc32",
.cra_driver_name = "safexcel-crc32",
.cra_priority = SAFEXCEL_CRA_PRIORITY,
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct safexcel_ahash_ctx),
.cra_init = safexcel_crc32_cra_init,
.cra_exit = safexcel_ahash_cra_exit,
.cra_module = THIS_MODULE,
},
},
},
};