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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support4 *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_skcipher_ctx_dma(25 crypto_skcipher_reqtfm(req));26 struct ccp_des3_req_ctx *rctx = skcipher_request_ctx_dma(req);27 28 if (ret)29 return ret;30 31 if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)32 memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE);33 34 return 0;35}36 37static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,38 unsigned int key_len)39{40 struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);41 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);42 int err;43 44 err = verify_skcipher_des3_key(tfm, key);45 if (err)46 return err;47 48 /* It's not clear that there is any support for a keysize of 112.49 * If needed, the caller should make K1 == K350 */51 ctx->u.des3.type = CCP_DES3_TYPE_168;52 ctx->u.des3.mode = alg->mode;53 ctx->u.des3.key_len = key_len;54 55 memcpy(ctx->u.des3.key, key, key_len);56 sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);57 58 return 0;59}60 61static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt)62{63 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);64 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);65 struct ccp_des3_req_ctx *rctx = skcipher_request_ctx_dma(req);66 struct scatterlist *iv_sg = NULL;67 unsigned int iv_len = 0;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_ENCRYPT94 : 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 return ccp_crypto_enqueue_request(&req->base, &rctx->cmd);104}105 106static int ccp_des3_encrypt(struct skcipher_request *req)107{108 return ccp_des3_crypt(req, true);109}110 111static int ccp_des3_decrypt(struct skcipher_request *req)112{113 return ccp_des3_crypt(req, false);114}115 116static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)117{118 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);119 120 ctx->complete = ccp_des3_complete;121 ctx->u.des3.key_len = 0;122 123 crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct ccp_des3_req_ctx));124 125 return 0;126}127 128static const struct skcipher_alg ccp_des3_defaults = {129 .setkey = ccp_des3_setkey,130 .encrypt = ccp_des3_encrypt,131 .decrypt = ccp_des3_decrypt,132 .min_keysize = DES3_EDE_KEY_SIZE,133 .max_keysize = DES3_EDE_KEY_SIZE,134 .init = ccp_des3_init_tfm,135 136 .base.cra_flags = CRYPTO_ALG_ASYNC |137 CRYPTO_ALG_ALLOCATES_MEMORY |138 CRYPTO_ALG_KERN_DRIVER_ONLY |139 CRYPTO_ALG_NEED_FALLBACK,140 .base.cra_blocksize = DES3_EDE_BLOCK_SIZE,141 .base.cra_ctxsize = sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING,142 .base.cra_priority = CCP_CRA_PRIORITY,143 .base.cra_module = THIS_MODULE,144};145 146struct ccp_des3_def {147 enum ccp_des3_mode mode;148 unsigned int version;149 const char *name;150 const char *driver_name;151 unsigned int blocksize;152 unsigned int ivsize;153 const struct skcipher_alg *alg_defaults;154};155 156static const struct ccp_des3_def des3_algs[] = {157 {158 .mode = CCP_DES3_MODE_ECB,159 .version = CCP_VERSION(5, 0),160 .name = "ecb(des3_ede)",161 .driver_name = "ecb-des3-ccp",162 .blocksize = DES3_EDE_BLOCK_SIZE,163 .ivsize = 0,164 .alg_defaults = &ccp_des3_defaults,165 },166 {167 .mode = CCP_DES3_MODE_CBC,168 .version = CCP_VERSION(5, 0),169 .name = "cbc(des3_ede)",170 .driver_name = "cbc-des3-ccp",171 .blocksize = DES3_EDE_BLOCK_SIZE,172 .ivsize = DES3_EDE_BLOCK_SIZE,173 .alg_defaults = &ccp_des3_defaults,174 },175};176 177static int ccp_register_des3_alg(struct list_head *head,178 const struct ccp_des3_def *def)179{180 struct ccp_crypto_skcipher_alg *ccp_alg;181 struct skcipher_alg *alg;182 int ret;183 184 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);185 if (!ccp_alg)186 return -ENOMEM;187 188 INIT_LIST_HEAD(&ccp_alg->entry);189 190 ccp_alg->mode = def->mode;191 192 /* Copy the defaults and override as necessary */193 alg = &ccp_alg->alg;194 *alg = *def->alg_defaults;195 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);196 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",197 def->driver_name);198 alg->base.cra_blocksize = def->blocksize;199 alg->ivsize = def->ivsize;200 201 ret = crypto_register_skcipher(alg);202 if (ret) {203 pr_err("%s skcipher algorithm registration error (%d)\n",204 alg->base.cra_name, ret);205 kfree(ccp_alg);206 return ret;207 }208 209 list_add(&ccp_alg->entry, head);210 211 return 0;212}213 214int ccp_register_des3_algs(struct list_head *head)215{216 int i, ret;217 unsigned int ccpversion = ccp_version();218 219 for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {220 if (des3_algs[i].version > ccpversion)221 continue;222 ret = ccp_register_des3_alg(head, &des3_algs[i]);223 if (ret)224 return ret;225 }226 227 return 0;228}229