skein_mod.c revision be32284091554a41d4706e6653adeec1d9127a87
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2013 Saso Kiselkov. All rights reserved.
*/
#include <sys/modctl.h>
#include <sys/crypto/common.h>
#include <sys/crypto/spi.h>
#include <sys/strsun.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#define SKEIN_MODULE_IMPL
#include <sys/skein.h>
/*
* Like the sha2 module, we create the skein module with two modlinkages:
* - modlmisc to allow direct calls to Skein_* API functions.
* - modlcrypto to integrate well into the Kernel Crypto Framework (KCF).
*/
static struct modlmisc modlmisc = {
&mod_miscops,
"Skein Message-Digest Algorithm"
};
static struct modlcrypto modlcrypto = {
&mod_cryptoops,
"Skein Kernel SW Provider"
};
static struct modlinkage modlinkage = {
MODREV_1, &modlmisc, &modlcrypto, NULL
};
static crypto_mech_info_t skein_mech_info_tab[] = {
{CKM_SKEIN_256, SKEIN_256_MECH_INFO_TYPE,
CRYPTO_FG_DIGEST | CRYPTO_FG_DIGEST_ATOMIC,
0, 0, CRYPTO_KEYSIZE_UNIT_IN_BITS},
{CKM_SKEIN_256_MAC, SKEIN_256_MAC_MECH_INFO_TYPE,
CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC, 1, INT_MAX,
CRYPTO_KEYSIZE_UNIT_IN_BYTES},
{CKM_SKEIN_512, SKEIN_512_MECH_INFO_TYPE,
CRYPTO_FG_DIGEST | CRYPTO_FG_DIGEST_ATOMIC,
0, 0, CRYPTO_KEYSIZE_UNIT_IN_BITS},
{CKM_SKEIN_512_MAC, SKEIN_512_MAC_MECH_INFO_TYPE,
CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC, 1, INT_MAX,
CRYPTO_KEYSIZE_UNIT_IN_BYTES},
{CKM_SKEIN1024, SKEIN1024_MECH_INFO_TYPE,
CRYPTO_FG_DIGEST | CRYPTO_FG_DIGEST_ATOMIC,
0, 0, CRYPTO_KEYSIZE_UNIT_IN_BITS},
{CKM_SKEIN1024_MAC, SKEIN1024_MAC_MECH_INFO_TYPE,
CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC, 1, INT_MAX,
CRYPTO_KEYSIZE_UNIT_IN_BYTES}
};
static void skein_provider_status(crypto_provider_handle_t, uint_t *);
static crypto_control_ops_t skein_control_ops = {
skein_provider_status
};
static int skein_digest_init(crypto_ctx_t *, crypto_mechanism_t *,
crypto_req_handle_t);
static int skein_digest(crypto_ctx_t *, crypto_data_t *, crypto_data_t *,
crypto_req_handle_t);
static int skein_update(crypto_ctx_t *, crypto_data_t *, crypto_req_handle_t);
static int skein_final(crypto_ctx_t *, crypto_data_t *, crypto_req_handle_t);
static int skein_digest_atomic(crypto_provider_handle_t, crypto_session_id_t,
crypto_mechanism_t *, crypto_data_t *, crypto_data_t *,
crypto_req_handle_t);
static crypto_digest_ops_t skein_digest_ops = {
skein_digest_init,
skein_digest,
skein_update,
NULL,
skein_final,
skein_digest_atomic
};
static int skein_mac_init(crypto_ctx_t *, crypto_mechanism_t *, crypto_key_t *,
crypto_spi_ctx_template_t, crypto_req_handle_t);
static int skein_mac_atomic(crypto_provider_handle_t, crypto_session_id_t,
crypto_mechanism_t *, crypto_key_t *, crypto_data_t *, crypto_data_t *,
crypto_spi_ctx_template_t, crypto_req_handle_t);
static crypto_mac_ops_t skein_mac_ops = {
skein_mac_init,
NULL,
skein_update, /* using regular digest update is OK here */
skein_final, /* using regular digest final is OK here */
skein_mac_atomic,
NULL
};
static int skein_create_ctx_template(crypto_provider_handle_t,
crypto_mechanism_t *, crypto_key_t *, crypto_spi_ctx_template_t *,
size_t *, crypto_req_handle_t);
static int skein_free_context(crypto_ctx_t *);
static crypto_ctx_ops_t skein_ctx_ops = {
skein_create_ctx_template,
skein_free_context
};
static crypto_ops_t skein_crypto_ops = {
&skein_control_ops,
&skein_digest_ops,
NULL,
&skein_mac_ops,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
&skein_ctx_ops,
NULL,
NULL,
NULL
};
static crypto_provider_info_t skein_prov_info = {
CRYPTO_SPI_VERSION_4,
"Skein Software Provider",
CRYPTO_SW_PROVIDER,
{&modlinkage},
NULL,
&skein_crypto_ops,
sizeof (skein_mech_info_tab) / sizeof (crypto_mech_info_t),
skein_mech_info_tab
};
static crypto_kcf_provider_handle_t skein_prov_handle = NULL;
typedef struct skein_ctx {
skein_mech_type_t sc_mech_type;
size_t sc_digest_bitlen;
union {
Skein_256_Ctxt_t sc_256;
Skein_512_Ctxt_t sc_512;
Skein1024_Ctxt_t sc_1024;
} sc_u;
} skein_ctx_t;
#define SKEIN_CTX(_ctx_) ((skein_ctx_t *)((_ctx_)->cc_provider_private))
#define SKEIN_CTX_LVALUE(_ctx_) (_ctx_)->cc_provider_private
#define SKEIN_OP(_skein_ctx, _op, ...) \
do { \
skein_ctx_t *sc = (_skein_ctx); \
switch (sc->sc_mech_type) { \
case SKEIN_256_MECH_INFO_TYPE: \
case SKEIN_256_MAC_MECH_INFO_TYPE: \
(void) Skein_256_ ## _op(&sc->sc_u.sc_256, \
__VA_ARGS__); \
break; \
case SKEIN_512_MECH_INFO_TYPE: \
case SKEIN_512_MAC_MECH_INFO_TYPE: \
(void) Skein_512_ ## _op(&sc->sc_u.sc_512, \
__VA_ARGS__); \
break; \
case SKEIN1024_MECH_INFO_TYPE: \
case SKEIN1024_MAC_MECH_INFO_TYPE: \
(void) Skein1024_ ## _op(&sc->sc_u.sc_1024, \
__VA_ARGS__); \
break; \
} \
_NOTE(CONSTCOND) \
} while (0)
static int
skein_get_digest_bitlen(const crypto_mechanism_t *mechanism, size_t *result)
{
if (mechanism->cm_param != NULL) {
/*LINTED(E_BAD_PTR_CAST_ALIGN)*/
skein_param_t *param = (skein_param_t *)mechanism->cm_param;
if (mechanism->cm_param_len != sizeof (*param) ||
param->sp_digest_bitlen == 0) {
return (CRYPTO_MECHANISM_PARAM_INVALID);
}
*result = param->sp_digest_bitlen;
} else {
switch (mechanism->cm_type) {
case SKEIN_256_MECH_INFO_TYPE:
*result = 256;
break;
case SKEIN_512_MECH_INFO_TYPE:
*result = 512;
break;
case SKEIN1024_MECH_INFO_TYPE:
*result = 1024;
break;
default:
return (CRYPTO_MECHANISM_INVALID);
}
}
return (CRYPTO_SUCCESS);
}
int
_init(void)
{
int error;
if ((error = mod_install(&modlinkage)) != 0)
return (error);
/*
* Try to register with KCF - failure shouldn't unload us, since we
* still may want to continue providing misc/skein functionality.
*/
(void) crypto_register_provider(&skein_prov_info, &skein_prov_handle);
return (0);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
/*
* KCF software provider control entry points.
*/
/* ARGSUSED */
static void
skein_provider_status(crypto_provider_handle_t provider, uint_t *status)
{
*status = CRYPTO_PROVIDER_READY;
}
/*
* General Skein hashing helper functions.
*/
/*
* Performs an Update on a context with uio input data.
*/
static int
skein_digest_update_uio(skein_ctx_t *ctx, const crypto_data_t *data)
{
off_t offset = data->cd_offset;
size_t length = data->cd_length;
uint_t vec_idx;
size_t cur_len;
const uio_t *uio = data->cd_uio;
/* we support only kernel buffer */
if (uio->uio_segflg != UIO_SYSSPACE)
return (CRYPTO_ARGUMENTS_BAD);
/*
* Jump to the first iovec containing data to be
* digested.
*/
for (vec_idx = 0; vec_idx < uio->uio_iovcnt &&
offset >= uio->uio_iov[vec_idx].iov_len;
offset -= uio->uio_iov[vec_idx++].iov_len)
;
if (vec_idx == uio->uio_iovcnt) {
/*
* The caller specified an offset that is larger than the
* total size of the buffers it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
/*
* Now do the digesting on the iovecs.
*/
while (vec_idx < uio->uio_iovcnt && length > 0) {
cur_len = MIN(uio->uio_iov[vec_idx].iov_len - offset, length);
SKEIN_OP(ctx, Update, (uint8_t *)uio->uio_iov[vec_idx].iov_base
+ offset, cur_len);
length -= cur_len;
vec_idx++;
offset = 0;
}
if (vec_idx == uio->uio_iovcnt && length > 0) {
/*
* The end of the specified iovec's was reached but
* the length requested could not be processed, i.e.
* The caller requested to digest more data than it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
return (CRYPTO_SUCCESS);
}
/*
* Performs a Final on a context and writes to a uio digest output.
*/
static int
skein_digest_final_uio(skein_ctx_t *ctx, crypto_data_t *digest,
crypto_req_handle_t req)
{
off_t offset = digest->cd_offset;
uint_t vec_idx;
uio_t *uio = digest->cd_uio;
/* we support only kernel buffer */
if (uio->uio_segflg != UIO_SYSSPACE)
return (CRYPTO_ARGUMENTS_BAD);
/*
* Jump to the first iovec containing ptr to the digest to be returned.
*/
for (vec_idx = 0; offset >= uio->uio_iov[vec_idx].iov_len &&
vec_idx < uio->uio_iovcnt;
offset -= uio->uio_iov[vec_idx++].iov_len)
;
if (vec_idx == uio->uio_iovcnt) {
/*
* The caller specified an offset that is larger than the
* total size of the buffers it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
if (offset + CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen) <=
uio->uio_iov[vec_idx].iov_len) {
/* The computed digest will fit in the current iovec. */
SKEIN_OP(ctx, Final,
(uchar_t *)uio->uio_iov[vec_idx].iov_base + offset);
} else {
uint8_t *digest_tmp;
off_t scratch_offset = 0;
size_t length = CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen);
size_t cur_len;
digest_tmp = kmem_alloc(CRYPTO_BITS2BYTES(
ctx->sc_digest_bitlen), crypto_kmflag(req));
if (digest_tmp == NULL)
return (CRYPTO_HOST_MEMORY);
SKEIN_OP(ctx, Final, digest_tmp);
while (vec_idx < uio->uio_iovcnt && length > 0) {
cur_len = MIN(uio->uio_iov[vec_idx].iov_len - offset,
length);
bcopy(digest_tmp + scratch_offset,
uio->uio_iov[vec_idx].iov_base + offset, cur_len);
length -= cur_len;
vec_idx++;
scratch_offset += cur_len;
offset = 0;
}
kmem_free(digest_tmp, CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen));
if (vec_idx == uio->uio_iovcnt && length > 0) {
/*
* The end of the specified iovec's was reached but
* the length requested could not be processed, i.e.
* The caller requested to digest more data than it
* provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
}
return (CRYPTO_SUCCESS);
}
/*
* Performs an Update on a context with mblk input data.
*/
static int
skein_digest_update_mblk(skein_ctx_t *ctx, crypto_data_t *data)
{
off_t offset = data->cd_offset;
size_t length = data->cd_length;
mblk_t *mp;
size_t cur_len;
/* Jump to the first mblk_t containing data to be digested. */
for (mp = data->cd_mp; mp != NULL && offset >= MBLKL(mp);
offset -= MBLKL(mp), mp = mp->b_cont)
;
if (mp == NULL) {
/*
* The caller specified an offset that is larger than the
* total size of the buffers it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
/* Now do the digesting on the mblk chain. */
while (mp != NULL && length > 0) {
cur_len = MIN(MBLKL(mp) - offset, length);
SKEIN_OP(ctx, Update, mp->b_rptr + offset, cur_len);
length -= cur_len;
offset = 0;
mp = mp->b_cont;
}
if (mp == NULL && length > 0) {
/*
* The end of the mblk was reached but the length requested
* could not be processed, i.e. The caller requested
* to digest more data than it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
return (CRYPTO_SUCCESS);
}
/*
* Performs a Final on a context and writes to an mblk digest output.
*/
static int
skein_digest_final_mblk(skein_ctx_t *ctx, crypto_data_t *digest,
crypto_req_handle_t req)
{
off_t offset = digest->cd_offset;
mblk_t *mp;
/* Jump to the first mblk_t that will be used to store the digest. */
for (mp = digest->cd_mp; mp != NULL && offset >= MBLKL(mp);
offset -= MBLKL(mp), mp = mp->b_cont)
;
if (mp == NULL) {
/* caller specified offset is too large */
return (CRYPTO_DATA_LEN_RANGE);
}
if (offset + CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen) <= MBLKL(mp)) {
/* The digest will fit in the current mblk. */
SKEIN_OP(ctx, Final, mp->b_rptr + offset);
} else {
/* Split the digest up between the individual buffers. */
uint8_t *digest_tmp;
off_t scratch_offset = 0;
size_t length = CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen);
size_t cur_len;
digest_tmp = kmem_alloc(CRYPTO_BITS2BYTES(
ctx->sc_digest_bitlen), crypto_kmflag(req));
if (digest_tmp == NULL)
return (CRYPTO_HOST_MEMORY);
SKEIN_OP(ctx, Final, digest_tmp);
while (mp != NULL && length > 0) {
cur_len = MIN(MBLKL(mp) - offset, length);
bcopy(digest_tmp + scratch_offset,
mp->b_rptr + offset, cur_len);
length -= cur_len;
mp = mp->b_cont;
scratch_offset += cur_len;
offset = 0;
}
kmem_free(digest_tmp, CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen));
if (mp == NULL && length > 0) {
/* digest too long to fit in the mblk buffers */
return (CRYPTO_DATA_LEN_RANGE);
}
}
return (CRYPTO_SUCCESS);
}
/*
* KCF software provider digest entry points.
*/
/*
* Initializes a skein digest context to the configuration in `mechanism'.
* The mechanism cm_type must be one of SKEIN_*_MECH_INFO_TYPE. The cm_param
* field may contain a skein_param_t structure indicating the length of the
* digest the algorithm should produce. Otherwise the default output lengths
* are applied (32 bytes for Skein-256, 64 bytes for Skein-512 and 128 bytes
* for Skein-1024).
*/
static int
skein_digest_init(crypto_ctx_t *ctx, crypto_mechanism_t *mechanism,
crypto_req_handle_t req)
{
int error = CRYPTO_SUCCESS;
if (!VALID_SKEIN_DIGEST_MECH(mechanism->cm_type))
return (CRYPTO_MECHANISM_INVALID);
SKEIN_CTX_LVALUE(ctx) = kmem_alloc(sizeof (*SKEIN_CTX(ctx)),
crypto_kmflag(req));
if (SKEIN_CTX(ctx) == NULL)
return (CRYPTO_HOST_MEMORY);
SKEIN_CTX(ctx)->sc_mech_type = mechanism->cm_type;
error = skein_get_digest_bitlen(mechanism,
&SKEIN_CTX(ctx)->sc_digest_bitlen);
if (error != CRYPTO_SUCCESS)
goto errout;
SKEIN_OP(SKEIN_CTX(ctx), Init, SKEIN_CTX(ctx)->sc_digest_bitlen);
return (CRYPTO_SUCCESS);
errout:
bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
SKEIN_CTX_LVALUE(ctx) = NULL;
return (error);
}
/*
* Executes a skein_update and skein_digest on a pre-initialized crypto
* context in a single step. See the documentation to these functions to
* see what to pass here.
*/
static int
skein_digest(crypto_ctx_t *ctx, crypto_data_t *data, crypto_data_t *digest,
crypto_req_handle_t req)
{
int error = CRYPTO_SUCCESS;
ASSERT(SKEIN_CTX(ctx) != NULL);
if (digest->cd_length <
CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen)) {
digest->cd_length =
CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen);
return (CRYPTO_BUFFER_TOO_SMALL);
}
error = skein_update(ctx, data, req);
if (error != CRYPTO_SUCCESS) {
bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
SKEIN_CTX_LVALUE(ctx) = NULL;
digest->cd_length = 0;
return (error);
}
error = skein_final(ctx, digest, req);
return (error);
}
/*
* Performs a skein Update with the input message in `data' (successive calls
* can push more data). This is used both for digest and MAC operation.
* Supported input data formats are raw, uio and mblk.
*/
/*ARGSUSED*/
static int
skein_update(crypto_ctx_t *ctx, crypto_data_t *data, crypto_req_handle_t req)
{
int error = CRYPTO_SUCCESS;
ASSERT(SKEIN_CTX(ctx) != NULL);
switch (data->cd_format) {
case CRYPTO_DATA_RAW:
SKEIN_OP(SKEIN_CTX(ctx), Update,
(uint8_t *)data->cd_raw.iov_base + data->cd_offset,
data->cd_length);
break;
case CRYPTO_DATA_UIO:
error = skein_digest_update_uio(SKEIN_CTX(ctx), data);
break;
case CRYPTO_DATA_MBLK:
error = skein_digest_update_mblk(SKEIN_CTX(ctx), data);
break;
default:
error = CRYPTO_ARGUMENTS_BAD;
}
return (error);
}
/*
* Performs a skein Final, writing the output to `digest'. This is used both
* for digest and MAC operation.
* Supported output digest formats are raw, uio and mblk.
*/
/*ARGSUSED*/
static int
skein_final(crypto_ctx_t *ctx, crypto_data_t *digest, crypto_req_handle_t req)
{
int error = CRYPTO_SUCCESS;
ASSERT(SKEIN_CTX(ctx) != NULL);
if (digest->cd_length <
CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen)) {
digest->cd_length =
CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen);
return (CRYPTO_BUFFER_TOO_SMALL);
}
switch (digest->cd_format) {
case CRYPTO_DATA_RAW:
SKEIN_OP(SKEIN_CTX(ctx), Final,
(uint8_t *)digest->cd_raw.iov_base + digest->cd_offset);
break;
case CRYPTO_DATA_UIO:
error = skein_digest_final_uio(SKEIN_CTX(ctx), digest, req);
break;
case CRYPTO_DATA_MBLK:
error = skein_digest_final_mblk(SKEIN_CTX(ctx), digest, req);
break;
default:
error = CRYPTO_ARGUMENTS_BAD;
}
if (error == CRYPTO_SUCCESS)
digest->cd_length =
CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen);
else
digest->cd_length = 0;
bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
kmem_free(SKEIN_CTX(ctx), sizeof (*(SKEIN_CTX(ctx))));
SKEIN_CTX_LVALUE(ctx) = NULL;
return (error);
}
/*
* Performs a full skein digest computation in a single call, configuring the
* algorithm according to `mechanism', reading the input to be digested from
* `data' and writing the output to `digest'.
* Supported input/output formats are raw, uio and mblk.
*/
/*ARGSUSED*/
static int
skein_digest_atomic(crypto_provider_handle_t provider,
crypto_session_id_t session_id, crypto_mechanism_t *mechanism,
crypto_data_t *data, crypto_data_t *digest, crypto_req_handle_t req)
{
int error;
skein_ctx_t skein_ctx;
crypto_ctx_t ctx;
SKEIN_CTX_LVALUE(&ctx) = &skein_ctx;
/* Init */
if (!VALID_SKEIN_DIGEST_MECH(mechanism->cm_type))
return (CRYPTO_MECHANISM_INVALID);
skein_ctx.sc_mech_type = mechanism->cm_type;
error = skein_get_digest_bitlen(mechanism, &skein_ctx.sc_digest_bitlen);
if (error != CRYPTO_SUCCESS)
goto out;
SKEIN_OP(&skein_ctx, Init, skein_ctx.sc_digest_bitlen);
if ((error = skein_update(&ctx, data, digest)) != CRYPTO_SUCCESS)
goto out;
if ((error = skein_final(&ctx, data, digest)) != CRYPTO_SUCCESS)
goto out;
out:
if (error == CRYPTO_SUCCESS)
digest->cd_length =
CRYPTO_BITS2BYTES(skein_ctx.sc_digest_bitlen);
else
digest->cd_length = 0;
bzero(&skein_ctx, sizeof (skein_ctx));
return (error);
}
/*
* Helper function that builds a Skein MAC context from the provided
* mechanism and key.
*/
static int
skein_mac_ctx_build(skein_ctx_t *ctx, crypto_mechanism_t *mechanism,
crypto_key_t *key)
{
int error;
if (!VALID_SKEIN_MAC_MECH(mechanism->cm_type))
return (CRYPTO_MECHANISM_INVALID);
if (key->ck_format != CRYPTO_KEY_RAW)
return (CRYPTO_ARGUMENTS_BAD);
ctx->sc_mech_type = mechanism->cm_type;
error = skein_get_digest_bitlen(mechanism, &ctx->sc_digest_bitlen);
if (error != CRYPTO_SUCCESS)
return (error);
SKEIN_OP(ctx, InitExt, ctx->sc_digest_bitlen, 0, key->ck_data,
CRYPTO_BITS2BYTES(key->ck_length));
return (CRYPTO_SUCCESS);
}
/*
* KCF software provide mac entry points.
*/
/*
* Initializes a skein MAC context. You may pass a ctx_template, in which
* case the template will be reused to make initialization more efficient.
* Otherwise a new context will be constructed. The mechanism cm_type must
* be one of SKEIN_*_MAC_MECH_INFO_TYPE. Same as in skein_digest_init, you
* may pass a skein_param_t in cm_param to configure the length of the
* digest. The key must be in raw format.
*/
static int
skein_mac_init(crypto_ctx_t *ctx, crypto_mechanism_t *mechanism,
crypto_key_t *key, crypto_spi_ctx_template_t ctx_template,
crypto_req_handle_t req)
{
int error;
SKEIN_CTX_LVALUE(ctx) = kmem_alloc(sizeof (*SKEIN_CTX(ctx)),
crypto_kmflag(req));
if (SKEIN_CTX(ctx) == NULL)
return (CRYPTO_HOST_MEMORY);
if (ctx_template != NULL) {
bcopy(ctx_template, SKEIN_CTX(ctx),
sizeof (*SKEIN_CTX(ctx)));
} else {
error = skein_mac_ctx_build(SKEIN_CTX(ctx), mechanism, key);
if (error != CRYPTO_SUCCESS)
goto errout;
}
return (CRYPTO_SUCCESS);
errout:
bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
return (error);
}
/*
* The MAC update and final calls are reused from the regular digest code.
*/
/*ARGSUSED*/
/*
* Same as skein_digest_atomic, performs an atomic Skein MAC operation in
* one step. All the same properties apply to the arguments of this
* function as to those of the partial operations above.
*/
static int
skein_mac_atomic(crypto_provider_handle_t provider,
crypto_session_id_t session_id, crypto_mechanism_t *mechanism,
crypto_key_t *key, crypto_data_t *data, crypto_data_t *mac,
crypto_spi_ctx_template_t ctx_template, crypto_req_handle_t req)
{
/* faux crypto context just for skein_digest_{update,final} */
int error;
crypto_ctx_t ctx;
skein_ctx_t skein_ctx;
SKEIN_CTX_LVALUE(&ctx) = &skein_ctx;
if (ctx_template != NULL) {
bcopy(ctx_template, &skein_ctx, sizeof (skein_ctx));
} else {
error = skein_mac_ctx_build(&skein_ctx, mechanism, key);
if (error != CRYPTO_SUCCESS)
goto errout;
}
if ((error = skein_update(&ctx, data, req)) != CRYPTO_SUCCESS)
goto errout;
if ((error = skein_final(&ctx, mac, req)) != CRYPTO_SUCCESS)
goto errout;
return (CRYPTO_SUCCESS);
errout:
bzero(&skein_ctx, sizeof (skein_ctx));
return (error);
}
/*
* KCF software provider context management entry points.
*/
/*
* Constructs a context template for the Skein MAC algorithm. The same
* properties apply to the arguments of this function as to those of
* skein_mac_init.
*/
/*ARGSUSED*/
static int
skein_create_ctx_template(crypto_provider_handle_t provider,
crypto_mechanism_t *mechanism, crypto_key_t *key,
crypto_spi_ctx_template_t *ctx_template, size_t *ctx_template_size,
crypto_req_handle_t req)
{
int error;
skein_ctx_t *ctx_tmpl;
ctx_tmpl = kmem_alloc(sizeof (*ctx_tmpl), crypto_kmflag(req));
if (ctx_tmpl == NULL)
return (CRYPTO_HOST_MEMORY);
error = skein_mac_ctx_build(ctx_tmpl, mechanism, key);
if (error != CRYPTO_SUCCESS)
goto errout;
*ctx_template = ctx_tmpl;
*ctx_template_size = sizeof (*ctx_tmpl);
return (CRYPTO_SUCCESS);
errout:
bzero(ctx_tmpl, sizeof (*ctx_tmpl));
kmem_free(ctx_tmpl, sizeof (*ctx_tmpl));
return (error);
}
/*
* Frees a skein context in a parent crypto context.
*/
static int
skein_free_context(crypto_ctx_t *ctx)
{
if (SKEIN_CTX(ctx) != NULL) {
bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx)));
SKEIN_CTX_LVALUE(ctx) = NULL;
}
return (CRYPTO_SUCCESS);
}