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 ablkcipher_request *req = ablkcipher_request_cast(async_req); 24 struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 25 struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req); 26 27 if (ret) 28 return ret; 29 30 if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) 31 memcpy(req->info, rctx->iv, DES3_EDE_BLOCK_SIZE); 32 33 return 0; 34 } 35 36 static int ccp_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key, 37 unsigned int key_len) 38 { 39 struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm)); 40 struct ccp_crypto_ablkcipher_alg *alg = 41 ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm)); 42 int err; 43 44 err = verify_ablkcipher_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 61 static int ccp_des3_crypt(struct ablkcipher_request *req, bool encrypt) 62 { 63 struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 64 struct ccp_des3_req_ctx *rctx = ablkcipher_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->nbytes & (DES3_EDE_BLOCK_SIZE - 1))) 75 return -EINVAL; 76 77 if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) { 78 if (!req->info) 79 return -EINVAL; 80 81 memcpy(rctx->iv, req->info, 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->nbytes; 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 ablkcipher_request *req) 109 { 110 return ccp_des3_crypt(req, true); 111 } 112 113 static int ccp_des3_decrypt(struct ablkcipher_request *req) 114 { 115 return ccp_des3_crypt(req, false); 116 } 117 118 static int ccp_des3_cra_init(struct crypto_tfm *tfm) 119 { 120 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); 121 122 ctx->complete = ccp_des3_complete; 123 ctx->u.des3.key_len = 0; 124 125 tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_des3_req_ctx); 126 127 return 0; 128 } 129 130 static void ccp_des3_cra_exit(struct crypto_tfm *tfm) 131 { 132 } 133 134 static struct crypto_alg ccp_des3_defaults = { 135 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 136 CRYPTO_ALG_ASYNC | 137 CRYPTO_ALG_KERN_DRIVER_ONLY | 138 CRYPTO_ALG_NEED_FALLBACK, 139 .cra_blocksize = DES3_EDE_BLOCK_SIZE, 140 .cra_ctxsize = sizeof(struct ccp_ctx), 141 .cra_priority = CCP_CRA_PRIORITY, 142 .cra_type = &crypto_ablkcipher_type, 143 .cra_init = ccp_des3_cra_init, 144 .cra_exit = ccp_des3_cra_exit, 145 .cra_module = THIS_MODULE, 146 .cra_ablkcipher = { 147 .setkey = ccp_des3_setkey, 148 .encrypt = ccp_des3_encrypt, 149 .decrypt = ccp_des3_decrypt, 150 .min_keysize = DES3_EDE_KEY_SIZE, 151 .max_keysize = DES3_EDE_KEY_SIZE, 152 }, 153 }; 154 155 struct ccp_des3_def { 156 enum ccp_des3_mode mode; 157 unsigned int version; 158 const char *name; 159 const char *driver_name; 160 unsigned int blocksize; 161 unsigned int ivsize; 162 struct crypto_alg *alg_defaults; 163 }; 164 165 static struct ccp_des3_def des3_algs[] = { 166 { 167 .mode = CCP_DES3_MODE_ECB, 168 .version = CCP_VERSION(5, 0), 169 .name = "ecb(des3_ede)", 170 .driver_name = "ecb-des3-ccp", 171 .blocksize = DES3_EDE_BLOCK_SIZE, 172 .ivsize = 0, 173 .alg_defaults = &ccp_des3_defaults, 174 }, 175 { 176 .mode = CCP_DES3_MODE_CBC, 177 .version = CCP_VERSION(5, 0), 178 .name = "cbc(des3_ede)", 179 .driver_name = "cbc-des3-ccp", 180 .blocksize = DES3_EDE_BLOCK_SIZE, 181 .ivsize = DES3_EDE_BLOCK_SIZE, 182 .alg_defaults = &ccp_des3_defaults, 183 }, 184 }; 185 186 static int ccp_register_des3_alg(struct list_head *head, 187 const struct ccp_des3_def *def) 188 { 189 struct ccp_crypto_ablkcipher_alg *ccp_alg; 190 struct crypto_alg *alg; 191 int ret; 192 193 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); 194 if (!ccp_alg) 195 return -ENOMEM; 196 197 INIT_LIST_HEAD(&ccp_alg->entry); 198 199 ccp_alg->mode = def->mode; 200 201 /* Copy the defaults and override as necessary */ 202 alg = &ccp_alg->alg; 203 *alg = *def->alg_defaults; 204 snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 205 snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 206 def->driver_name); 207 alg->cra_blocksize = def->blocksize; 208 alg->cra_ablkcipher.ivsize = def->ivsize; 209 210 ret = crypto_register_alg(alg); 211 if (ret) { 212 pr_err("%s ablkcipher algorithm registration error (%d)\n", 213 alg->cra_name, ret); 214 kfree(ccp_alg); 215 return ret; 216 } 217 218 list_add(&ccp_alg->entry, head); 219 220 return 0; 221 } 222 223 int ccp_register_des3_algs(struct list_head *head) 224 { 225 int i, ret; 226 unsigned int ccpversion = ccp_version(); 227 228 for (i = 0; i < ARRAY_SIZE(des3_algs); i++) { 229 if (des3_algs[i].version > ccpversion) 230 continue; 231 ret = ccp_register_des3_alg(head, &des3_algs[i]); 232 if (ret) 233 return ret; 234 } 235 236 return 0; 237 } 238