--- /dev/null
+/*
+ * AMD Cryptographic Coprocessor (CCP) SHA crypto API support
+ *
+ * Copyright (C) 2013 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <crypto/hash.h>
+#include <crypto/internal/hash.h>
+#include <crypto/sha.h>
+#include <crypto/scatterwalk.h>
+
+#include "ccp-crypto.h"
+
+static int ccp_sha_complete(struct crypto_async_request *async_req, int ret)
+{
+ struct ahash_request *req = ahash_request_cast(async_req);
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
+ unsigned int digest_size = crypto_ahash_digestsize(tfm);
+
+ if (ret)
+ goto e_free;
+
+ if (rctx->hash_rem) {
+ /* Save remaining data to buffer */
+ unsigned int offset = rctx->nbytes - rctx->hash_rem;
+
+ scatterwalk_map_and_copy(rctx->buf, rctx->src,
+ offset, rctx->hash_rem, 0);
+ rctx->buf_count = rctx->hash_rem;
+ } else {
+ rctx->buf_count = 0;
+ }
+
+ /* Update result area if supplied */
+ if (req->result)
+ memcpy(req->result, rctx->ctx, digest_size);
+
+e_free:
+ sg_free_table(&rctx->data_sg);
+
+ return ret;
+}
+
+static int ccp_do_sha_update(struct ahash_request *req, unsigned int nbytes,
+ unsigned int final)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
+ struct scatterlist *sg;
+ unsigned int block_size =
+ crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
+ unsigned int sg_count;
+ gfp_t gfp;
+ u64 len;
+ int ret;
+
+ len = (u64)rctx->buf_count + (u64)nbytes;
+
+ if (!final && (len <= block_size)) {
+ scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
+ 0, nbytes, 0);
+ rctx->buf_count += nbytes;
+
+ return 0;
+ }
+
+ rctx->src = req->src;
+ rctx->nbytes = nbytes;
+
+ rctx->final = final;
+ rctx->hash_rem = final ? 0 : len & (block_size - 1);
+ rctx->hash_cnt = len - rctx->hash_rem;
+ if (!final && !rctx->hash_rem) {
+ /* CCP can't do zero length final, so keep some data around */
+ rctx->hash_cnt -= block_size;
+ rctx->hash_rem = block_size;
+ }
+
+ /* Initialize the context scatterlist */
+ sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));
+
+ sg = NULL;
+ if (rctx->buf_count && nbytes) {
+ /* Build the data scatterlist table - allocate enough entries
+ * for both data pieces (buffer and input data)
+ */
+ gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
+ GFP_KERNEL : GFP_ATOMIC;
+ sg_count = sg_nents(req->src) + 1;
+ ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
+ if (ret)
+ return ret;
+
+ sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
+ sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
+ sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
+ sg_mark_end(sg);
+
+ sg = rctx->data_sg.sgl;
+ } else if (rctx->buf_count) {
+ sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
+
+ sg = &rctx->buf_sg;
+ } else if (nbytes) {
+ sg = req->src;
+ }
+
+ rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */
+
+ memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+ INIT_LIST_HEAD(&rctx->cmd.entry);
+ rctx->cmd.engine = CCP_ENGINE_SHA;
+ rctx->cmd.u.sha.type = rctx->type;
+ rctx->cmd.u.sha.ctx = &rctx->ctx_sg;
+ rctx->cmd.u.sha.ctx_len = sizeof(rctx->ctx);
+ rctx->cmd.u.sha.src = sg;
+ rctx->cmd.u.sha.src_len = rctx->hash_cnt;
+ rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
+ &ctx->u.sha.opad_sg : NULL;
+ rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
+ ctx->u.sha.opad_count : 0;
+ rctx->cmd.u.sha.first = rctx->first;
+ rctx->cmd.u.sha.final = rctx->final;
+ rctx->cmd.u.sha.msg_bits = rctx->msg_bits;
+
+ rctx->first = 0;
+
+ ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+ return ret;
+}
+
+static int ccp_sha_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
+ struct ccp_crypto_ahash_alg *alg =
+ ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
+ unsigned int block_size =
+ crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
+
+ memset(rctx, 0, sizeof(*rctx));
+
+ rctx->type = alg->type;
+ rctx->first = 1;
+
+ if (ctx->u.sha.key_len) {
+ /* Buffer the HMAC key for first update */
+ memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
+ rctx->buf_count = block_size;
+ }
+
+ return 0;
+}
+
+static int ccp_sha_update(struct ahash_request *req)
+{
+ return ccp_do_sha_update(req, req->nbytes, 0);
+}
+
+static int ccp_sha_final(struct ahash_request *req)
+{
+ return ccp_do_sha_update(req, 0, 1);
+}
+
+static int ccp_sha_finup(struct ahash_request *req)
+{
+ return ccp_do_sha_update(req, req->nbytes, 1);
+}
+
+static int ccp_sha_digest(struct ahash_request *req)
+{
+ int ret;
+
+ ret = ccp_sha_init(req);
+ if (ret)
+ return ret;
+
+ return ccp_sha_finup(req);
+}
+
+static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
+ struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
+
+ SHASH_DESC_ON_STACK(sdesc, shash);
+
+ unsigned int block_size = crypto_shash_blocksize(shash);
+ unsigned int digest_size = crypto_shash_digestsize(shash);
+ int i, ret;
+
+ /* Set to zero until complete */
+ ctx->u.sha.key_len = 0;
+
+ /* Clear key area to provide zero padding for keys smaller
+ * than the block size
+ */
+ memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));
+
+ if (key_len > block_size) {
+ /* Must hash the input key */
+ sdesc->tfm = shash;
+ sdesc->flags = crypto_ahash_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ ret = crypto_shash_digest(sdesc, key, key_len,
+ ctx->u.sha.key);
+ if (ret) {
+ crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ key_len = digest_size;
+ } else {
+ memcpy(ctx->u.sha.key, key, key_len);
+ }
+
+ for (i = 0; i < block_size; i++) {
+ ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36;
+ ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
+ }
+
+ sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
+ ctx->u.sha.opad_count = block_size;
+
+ ctx->u.sha.key_len = key_len;
+
+ return 0;
+}
+
+static int ccp_sha_cra_init(struct crypto_tfm *tfm)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
+
+ ctx->complete = ccp_sha_complete;
+ ctx->u.sha.key_len = 0;
+
+ crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));
+
+ return 0;
+}
+
+static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
+ struct crypto_shash *hmac_tfm;
+
+ hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
+ if (IS_ERR(hmac_tfm)) {
+ pr_warn("could not load driver %s need for HMAC support\n",
+ alg->child_alg);
+ return PTR_ERR(hmac_tfm);
+ }
+
+ ctx->u.sha.hmac_tfm = hmac_tfm;
+
+ return ccp_sha_cra_init(tfm);
+}
+
+static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (ctx->u.sha.hmac_tfm)
+ crypto_free_shash(ctx->u.sha.hmac_tfm);
+
+ ccp_sha_cra_exit(tfm);
+}
+
+struct ccp_sha_def {
+ const char *name;
+ const char *drv_name;
+ enum ccp_sha_type type;
+ u32 digest_size;
+ u32 block_size;
+};
+
+static struct ccp_sha_def sha_algs[] = {
+ {
+ .name = "sha1",
+ .drv_name = "sha1-ccp",
+ .type = CCP_SHA_TYPE_1,
+ .digest_size = SHA1_DIGEST_SIZE,
+ .block_size = SHA1_BLOCK_SIZE,
+ },
+ {
+ .name = "sha224",
+ .drv_name = "sha224-ccp",
+ .type = CCP_SHA_TYPE_224,
+ .digest_size = SHA224_DIGEST_SIZE,
+ .block_size = SHA224_BLOCK_SIZE,
+ },
+ {
+ .name = "sha256",
+ .drv_name = "sha256-ccp",
+ .type = CCP_SHA_TYPE_256,
+ .digest_size = SHA256_DIGEST_SIZE,
+ .block_size = SHA256_BLOCK_SIZE,
+ },
+};
+
+static int ccp_register_hmac_alg(struct list_head *head,
+ const struct ccp_sha_def *def,
+ const struct ccp_crypto_ahash_alg *base_alg)
+{
+ struct ccp_crypto_ahash_alg *ccp_alg;
+ struct ahash_alg *alg;
+ struct hash_alg_common *halg;
+ struct crypto_alg *base;
+ int ret;
+
+ ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
+ if (!ccp_alg)
+ return -ENOMEM;
+
+ /* Copy the base algorithm and only change what's necessary */
+ *ccp_alg = *base_alg;
+ INIT_LIST_HEAD(&ccp_alg->entry);
+
+ strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
+
+ alg = &ccp_alg->alg;
+ alg->setkey = ccp_sha_setkey;
+
+ halg = &alg->halg;
+
+ base = &halg->base;
+ snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
+ snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
+ def->drv_name);
+ base->cra_init = ccp_hmac_sha_cra_init;
+ base->cra_exit = ccp_hmac_sha_cra_exit;
+
+ ret = crypto_register_ahash(alg);
+ if (ret) {
+ pr_err("%s ahash algorithm registration error (%d)\n",
+ base->cra_name, ret);
+ kfree(ccp_alg);
+ return ret;
+ }
+
+ list_add(&ccp_alg->entry, head);
+
+ return ret;
+}
+
+static int ccp_register_sha_alg(struct list_head *head,
+ const struct ccp_sha_def *def)
+{
+ struct ccp_crypto_ahash_alg *ccp_alg;
+ struct ahash_alg *alg;
+ struct hash_alg_common *halg;
+ struct crypto_alg *base;
+ int ret;
+
+ ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
+ if (!ccp_alg)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ccp_alg->entry);
+
+ ccp_alg->type = def->type;
+
+ alg = &ccp_alg->alg;
+ alg->init = ccp_sha_init;
+ alg->update = ccp_sha_update;
+ alg->final = ccp_sha_final;
+ alg->finup = ccp_sha_finup;
+ alg->digest = ccp_sha_digest;
+
+ halg = &alg->halg;
+ halg->digestsize = def->digest_size;
+
+ base = &halg->base;
+ snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+ snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+ def->drv_name);
+ base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_NEED_FALLBACK;
+ base->cra_blocksize = def->block_size;
+ base->cra_ctxsize = sizeof(struct ccp_ctx);
+ base->cra_priority = CCP_CRA_PRIORITY;
+ base->cra_type = &crypto_ahash_type;
+ base->cra_init = ccp_sha_cra_init;
+ base->cra_exit = ccp_sha_cra_exit;
+ base->cra_module = THIS_MODULE;
+
+ ret = crypto_register_ahash(alg);
+ if (ret) {
+ pr_err("%s ahash algorithm registration error (%d)\n",
+ base->cra_name, ret);
+ kfree(ccp_alg);
+ return ret;
+ }
+
+ list_add(&ccp_alg->entry, head);
+
+ ret = ccp_register_hmac_alg(head, def, ccp_alg);
+
+ return ret;
+}
+
+int ccp_register_sha_algs(struct list_head *head)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
+ ret = ccp_register_sha_alg(head, &sha_algs[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff