linux/drivers/crypto/ccp/ccp-crypto-des3.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
   4 *
   5 * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
   6 *
   7 * Author: Gary R Hook <ghook@amd.com>
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/sched.h>
  12#include <linux/delay.h>
  13#include <linux/scatterlist.h>
  14#include <linux/crypto.h>
  15#include <crypto/algapi.h>
  16#include <crypto/scatterwalk.h>
  17#include <crypto/internal/des.h>
  18
  19#include "ccp-crypto.h"
  20
  21static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
  22{
  23        struct skcipher_request *req = skcipher_request_cast(async_req);
  24        struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
  25        struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
  26
  27        if (ret)
  28                return ret;
  29
  30        if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
  31                memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE);
  32
  33        return 0;
  34}
  35
  36static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
  37                unsigned int key_len)
  38{
  39        struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
  40        struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
  41        int err;
  42
  43        err = verify_skcipher_des3_key(tfm, key);
  44        if (err)
  45                return err;
  46
  47        /* It's not clear that there is any support for a keysize of 112.
  48         * If needed, the caller should make K1 == K3
  49         */
  50        ctx->u.des3.type = CCP_DES3_TYPE_168;
  51        ctx->u.des3.mode = alg->mode;
  52        ctx->u.des3.key_len = key_len;
  53
  54        memcpy(ctx->u.des3.key, key, key_len);
  55        sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
  56
  57        return 0;
  58}
  59
  60static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt)
  61{
  62        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
  63        struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
  64        struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
  65        struct scatterlist *iv_sg = NULL;
  66        unsigned int iv_len = 0;
  67        int ret;
  68
  69        if (!ctx->u.des3.key_len)
  70                return -EINVAL;
  71
  72        if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
  73             (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
  74            (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1)))
  75                return -EINVAL;
  76
  77        if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
  78                if (!req->iv)
  79                        return -EINVAL;
  80
  81                memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE);
  82                iv_sg = &rctx->iv_sg;
  83                iv_len = DES3_EDE_BLOCK_SIZE;
  84                sg_init_one(iv_sg, rctx->iv, iv_len);
  85        }
  86
  87        memset(&rctx->cmd, 0, sizeof(rctx->cmd));
  88        INIT_LIST_HEAD(&rctx->cmd.entry);
  89        rctx->cmd.engine = CCP_ENGINE_DES3;
  90        rctx->cmd.u.des3.type = ctx->u.des3.type;
  91        rctx->cmd.u.des3.mode = ctx->u.des3.mode;
  92        rctx->cmd.u.des3.action = (encrypt)
  93                                  ? CCP_DES3_ACTION_ENCRYPT
  94                                  : CCP_DES3_ACTION_DECRYPT;
  95        rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
  96        rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
  97        rctx->cmd.u.des3.iv = iv_sg;
  98        rctx->cmd.u.des3.iv_len = iv_len;
  99        rctx->cmd.u.des3.src = req->src;
 100        rctx->cmd.u.des3.src_len = req->cryptlen;
 101        rctx->cmd.u.des3.dst = req->dst;
 102
 103        ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
 104
 105        return ret;
 106}
 107
 108static int ccp_des3_encrypt(struct skcipher_request *req)
 109{
 110        return ccp_des3_crypt(req, true);
 111}
 112
 113static int ccp_des3_decrypt(struct skcipher_request *req)
 114{
 115        return ccp_des3_crypt(req, false);
 116}
 117
 118static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)
 119{
 120        struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
 121
 122        ctx->complete = ccp_des3_complete;
 123        ctx->u.des3.key_len = 0;
 124
 125        crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_des3_req_ctx));
 126
 127        return 0;
 128}
 129
 130static const struct skcipher_alg ccp_des3_defaults = {
 131        .setkey                 = ccp_des3_setkey,
 132        .encrypt                = ccp_des3_encrypt,
 133        .decrypt                = ccp_des3_decrypt,
 134        .min_keysize            = DES3_EDE_KEY_SIZE,
 135        .max_keysize            = DES3_EDE_KEY_SIZE,
 136        .init                   = ccp_des3_init_tfm,
 137
 138        .base.cra_flags         = CRYPTO_ALG_ASYNC |
 139                                  CRYPTO_ALG_ALLOCATES_MEMORY |
 140                                  CRYPTO_ALG_KERN_DRIVER_ONLY |
 141                                  CRYPTO_ALG_NEED_FALLBACK,
 142        .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
 143        .base.cra_ctxsize       = sizeof(struct ccp_ctx),
 144        .base.cra_priority      = CCP_CRA_PRIORITY,
 145        .base.cra_module        = THIS_MODULE,
 146};
 147
 148struct ccp_des3_def {
 149        enum ccp_des3_mode mode;
 150        unsigned int version;
 151        const char *name;
 152        const char *driver_name;
 153        unsigned int blocksize;
 154        unsigned int ivsize;
 155        const struct skcipher_alg *alg_defaults;
 156};
 157
 158static const struct ccp_des3_def des3_algs[] = {
 159        {
 160                .mode           = CCP_DES3_MODE_ECB,
 161                .version        = CCP_VERSION(5, 0),
 162                .name           = "ecb(des3_ede)",
 163                .driver_name    = "ecb-des3-ccp",
 164                .blocksize      = DES3_EDE_BLOCK_SIZE,
 165                .ivsize         = 0,
 166                .alg_defaults   = &ccp_des3_defaults,
 167        },
 168        {
 169                .mode           = CCP_DES3_MODE_CBC,
 170                .version        = CCP_VERSION(5, 0),
 171                .name           = "cbc(des3_ede)",
 172                .driver_name    = "cbc-des3-ccp",
 173                .blocksize      = DES3_EDE_BLOCK_SIZE,
 174                .ivsize         = DES3_EDE_BLOCK_SIZE,
 175                .alg_defaults   = &ccp_des3_defaults,
 176        },
 177};
 178
 179static int ccp_register_des3_alg(struct list_head *head,
 180                                 const struct ccp_des3_def *def)
 181{
 182        struct ccp_crypto_skcipher_alg *ccp_alg;
 183        struct skcipher_alg *alg;
 184        int ret;
 185
 186        ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
 187        if (!ccp_alg)
 188                return -ENOMEM;
 189
 190        INIT_LIST_HEAD(&ccp_alg->entry);
 191
 192        ccp_alg->mode = def->mode;
 193
 194        /* Copy the defaults and override as necessary */
 195        alg = &ccp_alg->alg;
 196        *alg = *def->alg_defaults;
 197        snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
 198        snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
 199                        def->driver_name);
 200        alg->base.cra_blocksize = def->blocksize;
 201        alg->ivsize = def->ivsize;
 202
 203        ret = crypto_register_skcipher(alg);
 204        if (ret) {
 205                pr_err("%s skcipher algorithm registration error (%d)\n",
 206                                alg->base.cra_name, ret);
 207                kfree(ccp_alg);
 208                return ret;
 209        }
 210
 211        list_add(&ccp_alg->entry, head);
 212
 213        return 0;
 214}
 215
 216int ccp_register_des3_algs(struct list_head *head)
 217{
 218        int i, ret;
 219        unsigned int ccpversion = ccp_version();
 220
 221        for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
 222                if (des3_algs[i].version > ccpversion)
 223                        continue;
 224                ret = ccp_register_des3_alg(head, &des3_algs[i]);
 225                if (ret)
 226                        return ret;
 227        }
 228
 229        return 0;
 230}
 231