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_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 == K3 50 */ 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_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 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