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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
0004  *
0005  * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
0006  *
0007  * Author: Gary R Hook <ghook@amd.com>
0008  */
0009 
0010 #include <linux/module.h>
0011 #include <linux/sched.h>
0012 #include <linux/delay.h>
0013 #include <linux/scatterlist.h>
0014 #include <linux/crypto.h>
0015 #include <crypto/algapi.h>
0016 #include <crypto/scatterwalk.h>
0017 #include <crypto/internal/des.h>
0018 
0019 #include "ccp-crypto.h"
0020 
0021 static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
0022 {
0023     struct skcipher_request *req = skcipher_request_cast(async_req);
0024     struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
0025     struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
0026 
0027     if (ret)
0028         return ret;
0029 
0030     if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
0031         memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE);
0032 
0033     return 0;
0034 }
0035 
0036 static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
0037         unsigned int key_len)
0038 {
0039     struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
0040     struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
0041     int err;
0042 
0043     err = verify_skcipher_des3_key(tfm, key);
0044     if (err)
0045         return err;
0046 
0047     /* It's not clear that there is any support for a keysize of 112.
0048      * If needed, the caller should make K1 == K3
0049      */
0050     ctx->u.des3.type = CCP_DES3_TYPE_168;
0051     ctx->u.des3.mode = alg->mode;
0052     ctx->u.des3.key_len = key_len;
0053 
0054     memcpy(ctx->u.des3.key, key, key_len);
0055     sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
0056 
0057     return 0;
0058 }
0059 
0060 static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt)
0061 {
0062     struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
0063     struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
0064     struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
0065     struct scatterlist *iv_sg = NULL;
0066     unsigned int iv_len = 0;
0067     int ret;
0068 
0069     if (!ctx->u.des3.key_len)
0070         return -EINVAL;
0071 
0072     if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
0073          (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
0074         (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1)))
0075         return -EINVAL;
0076 
0077     if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
0078         if (!req->iv)
0079             return -EINVAL;
0080 
0081         memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE);
0082         iv_sg = &rctx->iv_sg;
0083         iv_len = DES3_EDE_BLOCK_SIZE;
0084         sg_init_one(iv_sg, rctx->iv, iv_len);
0085     }
0086 
0087     memset(&rctx->cmd, 0, sizeof(rctx->cmd));
0088     INIT_LIST_HEAD(&rctx->cmd.entry);
0089     rctx->cmd.engine = CCP_ENGINE_DES3;
0090     rctx->cmd.u.des3.type = ctx->u.des3.type;
0091     rctx->cmd.u.des3.mode = ctx->u.des3.mode;
0092     rctx->cmd.u.des3.action = (encrypt)
0093                   ? CCP_DES3_ACTION_ENCRYPT
0094                   : CCP_DES3_ACTION_DECRYPT;
0095     rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
0096     rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
0097     rctx->cmd.u.des3.iv = iv_sg;
0098     rctx->cmd.u.des3.iv_len = iv_len;
0099     rctx->cmd.u.des3.src = req->src;
0100     rctx->cmd.u.des3.src_len = req->cryptlen;
0101     rctx->cmd.u.des3.dst = req->dst;
0102 
0103     ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
0104 
0105     return ret;
0106 }
0107 
0108 static int ccp_des3_encrypt(struct skcipher_request *req)
0109 {
0110     return ccp_des3_crypt(req, true);
0111 }
0112 
0113 static int ccp_des3_decrypt(struct skcipher_request *req)
0114 {
0115     return ccp_des3_crypt(req, false);
0116 }
0117 
0118 static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)
0119 {
0120     struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
0121 
0122     ctx->complete = ccp_des3_complete;
0123     ctx->u.des3.key_len = 0;
0124 
0125     crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_des3_req_ctx));
0126 
0127     return 0;
0128 }
0129 
0130 static const struct skcipher_alg ccp_des3_defaults = {
0131     .setkey         = ccp_des3_setkey,
0132     .encrypt        = ccp_des3_encrypt,
0133     .decrypt        = ccp_des3_decrypt,
0134     .min_keysize        = DES3_EDE_KEY_SIZE,
0135     .max_keysize        = DES3_EDE_KEY_SIZE,
0136     .init           = ccp_des3_init_tfm,
0137 
0138     .base.cra_flags     = CRYPTO_ALG_ASYNC |
0139                   CRYPTO_ALG_ALLOCATES_MEMORY |
0140                   CRYPTO_ALG_KERN_DRIVER_ONLY |
0141                   CRYPTO_ALG_NEED_FALLBACK,
0142     .base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
0143     .base.cra_ctxsize   = sizeof(struct ccp_ctx),
0144     .base.cra_priority  = CCP_CRA_PRIORITY,
0145     .base.cra_module    = THIS_MODULE,
0146 };
0147 
0148 struct ccp_des3_def {
0149     enum ccp_des3_mode mode;
0150     unsigned int version;
0151     const char *name;
0152     const char *driver_name;
0153     unsigned int blocksize;
0154     unsigned int ivsize;
0155     const struct skcipher_alg *alg_defaults;
0156 };
0157 
0158 static const struct ccp_des3_def des3_algs[] = {
0159     {
0160         .mode       = CCP_DES3_MODE_ECB,
0161         .version    = CCP_VERSION(5, 0),
0162         .name       = "ecb(des3_ede)",
0163         .driver_name    = "ecb-des3-ccp",
0164         .blocksize  = DES3_EDE_BLOCK_SIZE,
0165         .ivsize     = 0,
0166         .alg_defaults   = &ccp_des3_defaults,
0167     },
0168     {
0169         .mode       = CCP_DES3_MODE_CBC,
0170         .version    = CCP_VERSION(5, 0),
0171         .name       = "cbc(des3_ede)",
0172         .driver_name    = "cbc-des3-ccp",
0173         .blocksize  = DES3_EDE_BLOCK_SIZE,
0174         .ivsize     = DES3_EDE_BLOCK_SIZE,
0175         .alg_defaults   = &ccp_des3_defaults,
0176     },
0177 };
0178 
0179 static int ccp_register_des3_alg(struct list_head *head,
0180                  const struct ccp_des3_def *def)
0181 {
0182     struct ccp_crypto_skcipher_alg *ccp_alg;
0183     struct skcipher_alg *alg;
0184     int ret;
0185 
0186     ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
0187     if (!ccp_alg)
0188         return -ENOMEM;
0189 
0190     INIT_LIST_HEAD(&ccp_alg->entry);
0191 
0192     ccp_alg->mode = def->mode;
0193 
0194     /* Copy the defaults and override as necessary */
0195     alg = &ccp_alg->alg;
0196     *alg = *def->alg_defaults;
0197     snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
0198     snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
0199             def->driver_name);
0200     alg->base.cra_blocksize = def->blocksize;
0201     alg->ivsize = def->ivsize;
0202 
0203     ret = crypto_register_skcipher(alg);
0204     if (ret) {
0205         pr_err("%s skcipher algorithm registration error (%d)\n",
0206                 alg->base.cra_name, ret);
0207         kfree(ccp_alg);
0208         return ret;
0209     }
0210 
0211     list_add(&ccp_alg->entry, head);
0212 
0213     return 0;
0214 }
0215 
0216 int ccp_register_des3_algs(struct list_head *head)
0217 {
0218     int i, ret;
0219     unsigned int ccpversion = ccp_version();
0220 
0221     for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
0222         if (des3_algs[i].version > ccpversion)
0223             continue;
0224         ret = ccp_register_des3_alg(head, &des3_algs[i]);
0225         if (ret)
0226             return ret;
0227     }
0228 
0229     return 0;
0230 }
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