crypto: ccp - CCP SHA crypto API support

These routines provide crypto API support for SHA1, SHA224 and SHA256
on the AMD CCP.  HMAC support for these SHA modes is also provided.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 497 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/ccp-crypto-sha.c b/drivers/crypto/ccp/ccp-crypto-sha.c
new file mode 100644
index 000000000000..44ff00a09c8a
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-sha.c
@@ -0,0 +1,497 @@
+/*
+ * 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"
+
+
+struct ccp_sha_result {
+        struct completion completion;
+        int err;
+};
+
+static void ccp_sync_hash_complete(struct crypto_async_request *req, int err)
+{
+        struct ccp_sha_result *result = req->data;
+
+        if (err == -EINPROGRESS)
+                return;
+
+        result->err = err;
+        complete(&result->completion);
+}
+
+static int ccp_sync_hash(struct crypto_ahash *tfm, u8 *buf,
+                         struct scatterlist *sg, unsigned int len)
+{
+        struct ccp_sha_result result;
+        struct ahash_request *req;
+        int ret;
+
+        init_completion(&result.completion);
+
+        req = ahash_request_alloc(tfm, GFP_KERNEL);
+        if (!req)
+                return -ENOMEM;
+
+        ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+                                   ccp_sync_hash_complete, &result);
+        ahash_request_set_crypt(req, sg, buf, len);
+
+        ret = crypto_ahash_digest(req);
+        if ((ret == -EINPROGRESS) || (ret == -EBUSY)) {
+                ret = wait_for_completion_interruptible(&result.completion);
+                if (!ret)
+                        ret = result.err;
+        }
+
+        ahash_request_free(req);
+
+        return ret;
+}
+
+static int ccp_sha_finish_hmac(struct crypto_async_request *async_req)
+{
+        struct ahash_request *req = ahash_request_cast(async_req);
+        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+        struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
+        struct scatterlist sg[2];
+        unsigned int block_size =
+                crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
+        unsigned int digest_size = crypto_ahash_digestsize(tfm);
+
+        sg_init_table(sg, ARRAY_SIZE(sg));
+        sg_set_buf(&sg[0], ctx->u.sha.opad, block_size);
+        sg_set_buf(&sg[1], req->result, digest_size);
+
+        return ccp_sync_hash(ctx->u.sha.hmac_tfm, req->result, sg,
+                             block_size + digest_size);
+}
+
+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_ctx *ctx = crypto_ahash_ctx(tfm);
+        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 */
+                scatterwalk_map_and_copy(rctx->buf, rctx->cmd.u.sha.src,
+                                         rctx->hash_cnt, rctx->hash_rem, 0);
+                rctx->buf_count = rctx->hash_rem;
+        } else
+                rctx->buf_count = 0;
+
+        memcpy(req->result, rctx->ctx, digest_size);
+
+        /* If we're doing an HMAC, we need to perform that on the final op */
+        if (rctx->final && ctx->u.sha.key_len)
+                ret = ccp_sha_finish_hmac(async_req);
+
+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 len, sg_count;
+        int ret;
+
+        if (!final && ((nbytes + rctx->buf_count) <= block_size)) {
+                scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
+                                         0, nbytes, 0);
+                rctx->buf_count += nbytes;
+
+                return 0;
+        }
+
+        len = rctx->buf_count + nbytes;
+
+        rctx->final = final;
+        rctx->hash_cnt = final ? len : len & ~(block_size - 1);
+        rctx->hash_rem = final ?   0 : len &  (block_size - 1);
+        if (!final && (rctx->hash_cnt == len)) {
+                /* 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));
+
+        /* Build the data scatterlist table - allocate enough entries for all
+         * possible data pieces (hmac ipad, buffer, input data)
+         */
+        sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2;
+        ret = sg_alloc_table(&rctx->data_sg, sg_count, GFP_KERNEL);
+        if (ret)
+                return ret;
+
+        sg = NULL;
+        if (rctx->first && ctx->u.sha.key_len) {
+                rctx->hash_cnt += block_size;
+
+                sg_init_one(&rctx->pad_sg, ctx->u.sha.ipad, block_size);
+                sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg);
+        }
+
+        if (rctx->buf_count) {
+                sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
+                sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
+        }
+
+        if (nbytes)
+                sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
+
+        if (sg)
+                sg_mark_end(sg);
+
+        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->data_sg.sgl : NULL;
+        rctx->cmd.u.sha.src_len = rctx->hash_cnt;
+        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_sha_req_ctx *rctx = ahash_request_ctx(req);
+        struct ccp_crypto_ahash_alg *alg =
+                ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
+
+        memset(rctx, 0, sizeof(*rctx));
+
+        memcpy(rctx->ctx, alg->init, sizeof(rctx->ctx));
+        rctx->type = alg->type;
+        rctx->first = 1;
+
+        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)
+{
+        ccp_sha_init(req);
+
+        return ccp_do_sha_update(req, req->nbytes, 1);
+}
+
+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 scatterlist sg;
+        unsigned int block_size =
+                crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
+        unsigned int digest_size = crypto_ahash_digestsize(tfm);
+        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 */
+                sg_init_one(&sg, key, key_len);
+                ret = ccp_sync_hash(tfm, ctx->u.sha.key, &sg, key_len);
+                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;
+        }
+
+        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_ahash *hmac_tfm;
+
+        hmac_tfm = crypto_alloc_ahash(alg->child_alg,
+                                      CRYPTO_ALG_TYPE_AHASH, 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_ahash(ctx->u.sha.hmac_tfm);
+
+        ccp_sha_cra_exit(tfm);
+}
+
+static const u32 sha1_init[CCP_SHA_CTXSIZE / sizeof(u32)] = {
+        cpu_to_be32(SHA1_H0), cpu_to_be32(SHA1_H1),
+        cpu_to_be32(SHA1_H2), cpu_to_be32(SHA1_H3),
+        cpu_to_be32(SHA1_H4), 0, 0, 0,
+};
+
+static const u32 sha224_init[CCP_SHA_CTXSIZE / sizeof(u32)] = {
+        cpu_to_be32(SHA224_H0), cpu_to_be32(SHA224_H1),
+        cpu_to_be32(SHA224_H2), cpu_to_be32(SHA224_H3),
+        cpu_to_be32(SHA224_H4), cpu_to_be32(SHA224_H5),
+        cpu_to_be32(SHA224_H6), cpu_to_be32(SHA224_H7),
+};
+
+static const u32 sha256_init[CCP_SHA_CTXSIZE / sizeof(u32)] = {
+        cpu_to_be32(SHA256_H0), cpu_to_be32(SHA256_H1),
+        cpu_to_be32(SHA256_H2), cpu_to_be32(SHA256_H3),
+        cpu_to_be32(SHA256_H4), cpu_to_be32(SHA256_H5),
+        cpu_to_be32(SHA256_H6), cpu_to_be32(SHA256_H7),
+};
+
+struct ccp_sha_def {
+        const char *name;
+        const char *drv_name;
+        const u32 *init;
+        enum ccp_sha_type type;
+        u32 digest_size;
+        u32 block_size;
+};
+
+static struct ccp_sha_def sha_algs[] = {
+        {
+                .name           = "sha1",
+                .drv_name       = "sha1-ccp",
+                .init           = sha1_init,
+                .type           = CCP_SHA_TYPE_1,
+                .digest_size    = SHA1_DIGEST_SIZE,
+                .block_size     = SHA1_BLOCK_SIZE,
+        },
+        {
+                .name           = "sha224",
+                .drv_name       = "sha224-ccp",
+                .init           = sha224_init,
+                .type           = CCP_SHA_TYPE_224,
+                .digest_size    = SHA224_DIGEST_SIZE,
+                .block_size     = SHA224_BLOCK_SIZE,
+        },
+        {
+                .name           = "sha256",
+                .drv_name       = "sha256-ccp",
+                .init           = sha256_init,
+                .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 */
+        memcpy(ccp_alg, base_alg, sizeof(*ccp_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->init = def->init;
+        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;
+}