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Diffstat (limited to 'sys/contrib/openzfs/module/icp/io/skein_mod.c')
-rw-r--r--sys/contrib/openzfs/module/icp/io/skein_mod.c729
1 files changed, 729 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/module/icp/io/skein_mod.c b/sys/contrib/openzfs/module/icp/io/skein_mod.c
new file mode 100644
index 000000000000..18026807fd84
--- /dev/null
+++ b/sys/contrib/openzfs/module/icp/io/skein_mod.c
@@ -0,0 +1,729 @@
+/*
+ * 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/icp.h>
+#include <sys/crypto/spi.h>
+#include <sys/sysmacros.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_cryptoops,
+ "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 = {
+ .digest_init = skein_digest_init,
+ .digest = skein_digest,
+ .digest_update = skein_update,
+ .digest_key = NULL,
+ .digest_final = skein_final,
+ .digest_atomic = 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 = {
+ .mac_init = skein_mac_init,
+ .mac = NULL,
+ .mac_update = skein_update, /* using regular digest update is OK here */
+ .mac_final = skein_final, /* using regular digest final is OK here */
+ .mac_atomic = skein_mac_atomic,
+ .mac_verify_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 = {
+ .create_ctx_template = skein_create_ctx_template,
+ .free_context = 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,
+}}}}};
+
+static crypto_provider_info_t skein_prov_info = {{{{
+ CRYPTO_SPI_VERSION_1,
+ "Skein Software Provider",
+ CRYPTO_SW_PROVIDER,
+ 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 = 0;
+
+typedef struct skein_ctx {
+ skein_mech_type_t sc_mech_type;
+ size_t sc_digest_bitlen;
+ /*LINTED(E_ANONYMOUS_UNION_DECL)*/
+ union {
+ Skein_256_Ctxt_t sc_256;
+ Skein_512_Ctxt_t sc_512;
+ Skein1024_Ctxt_t sc_1024;
+ };
+} 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_256, __VA_ARGS__);\
+ break; \
+ case SKEIN_512_MECH_INFO_TYPE: \
+ case SKEIN_512_MAC_MECH_INFO_TYPE: \
+ (void) Skein_512_ ## _op(&sc->sc_512, __VA_ARGS__);\
+ break; \
+ case SKEIN1024_MECH_INFO_TYPE: \
+ case SKEIN1024_MAC_MECH_INFO_TYPE: \
+ (void) Skein1024_ ## _op(&sc->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
+skein_mod_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
+skein_mod_fini(void)
+{
+ int ret;
+
+ if (skein_prov_handle != 0) {
+ if ((ret = crypto_unregister_provider(skein_prov_handle)) !=
+ CRYPTO_SUCCESS) {
+ cmn_err(CE_WARN,
+ "skein _fini: crypto_unregister_provider() "
+ "failed (0x%x)", ret);
+ return (EBUSY);
+ }
+ skein_prov_handle = 0;
+ }
+
+ return (mod_remove(&modlinkage));
+}
+
+/*
+ * 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 = 0;
+ size_t cur_len;
+ uio_t *uio = data->cd_uio;
+
+ /* we support only kernel buffer */
+ if (uio_segflg(uio) != UIO_SYSSPACE)
+ return (CRYPTO_ARGUMENTS_BAD);
+
+ /*
+ * Jump to the first iovec containing data to be
+ * digested.
+ */
+ offset = uio_index_at_offset(uio, offset, &vec_idx);
+ if (vec_idx == uio_iovcnt(uio)) {
+ /*
+ * 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_iovcnt(uio) && length > 0) {
+ cur_len = MIN(uio_iovlen(uio, vec_idx) - offset, length);
+ SKEIN_OP(ctx, Update, (uint8_t *)uio_iovbase(uio, vec_idx)
+ + offset, cur_len);
+ length -= cur_len;
+ vec_idx++;
+ offset = 0;
+ }
+
+ if (vec_idx == uio_iovcnt(uio) && 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 = 0;
+ uio_t *uio = digest->cd_uio;
+
+ /* we support only kernel buffer */
+ if (uio_segflg(uio) != UIO_SYSSPACE)
+ return (CRYPTO_ARGUMENTS_BAD);
+
+ /*
+ * Jump to the first iovec containing ptr to the digest to be returned.
+ */
+ offset = uio_index_at_offset(uio, offset, &vec_idx);
+ if (vec_idx == uio_iovcnt(uio)) {
+ /*
+ * 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_iovlen(uio, vec_idx)) {
+ /* The computed digest will fit in the current iovec. */
+ SKEIN_OP(ctx, Final,
+ (uchar_t *)uio_iovbase(uio, vec_idx) + 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_iovcnt(uio) && length > 0) {
+ cur_len = MIN(uio_iovlen(uio, vec_idx) - offset,
+ length);
+ bcopy(digest_tmp + scratch_offset,
+ uio_iovbase(uio, vec_idx) + 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_iovcnt(uio) && 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);
+}
+
+/*
+ * 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;
+ 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;
+ 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);
+}