drivers/crypto/ccp/ccp-crypto-des3.c

   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
  21 static 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
  36 static 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
  60 static 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
 108 static int ccp_des3_encrypt(struct skcipher_request *req)
 109 {
 110         return ccp_des3_crypt(req, true);
 111 }
 112
 113 static int ccp_des3_decrypt(struct skcipher_request *req)
 114 {
 115         return ccp_des3_crypt(req, false);
 116 }
 117
 118 static 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
 130 static 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
 148 struct 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
 158 static 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
 179 static 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
 216 int 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 }