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_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 36static 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 60static 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 108static int ccp_des3_encrypt(struct skcipher_request *req) 109{ 110 return ccp_des3_crypt(req, true); 111} 112 113static int ccp_des3_decrypt(struct skcipher_request *req) 114{ 115 return ccp_des3_crypt(req, false); 116} 117 118static 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 130static 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 148struct 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 158static 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 179static 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 216int 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} 231