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 <crypto/internal/des.h> 11 #include <crypto/internal/skcipher.h> 12 #include <linux/err.h> 13 #include <linux/kernel.h> 14 #include <linux/list.h> 15 #include <linux/module.h> 16 #include <linux/scatterlist.h> 17 #include <linux/slab.h> 18 #include <linux/string.h> 19 20 #include "ccp-crypto.h" 21 22 static int ccp_des3_complete(struct crypto_async_request *async_req, int ret) 23 { 24 struct skcipher_request *req = skcipher_request_cast(async_req); 25 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma( 26 crypto_skcipher_reqtfm(req)); 27 struct ccp_des3_req_ctx *rctx = skcipher_request_ctx_dma(req); 28 29 if (ret) 30 return ret; 31 32 if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) 33 memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE); 34 35 return 0; 36 } 37 38 static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, 39 unsigned int key_len) 40 { 41 struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm); 42 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm); 43 int err; 44 45 err = verify_skcipher_des3_key(tfm, key); 46 if (err) 47 return err; 48 49 /* It's not clear that there is any support for a keysize of 112. 50 * If needed, the caller should make K1 == K3 51 */ 52 ctx->u.des3.type = CCP_DES3_TYPE_168; 53 ctx->u.des3.mode = alg->mode; 54 ctx->u.des3.key_len = key_len; 55 56 memcpy(ctx->u.des3.key, key, key_len); 57 sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len); 58 59 return 0; 60 } 61 62 static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt) 63 { 64 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 65 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm); 66 struct ccp_des3_req_ctx *rctx = skcipher_request_ctx_dma(req); 67 struct scatterlist *iv_sg = NULL; 68 unsigned int iv_len = 0; 69 70 if (!ctx->u.des3.key_len) 71 return -EINVAL; 72 73 if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) || 74 (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) && 75 (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1))) 76 return -EINVAL; 77 78 if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) { 79 if (!req->iv) 80 return -EINVAL; 81 82 memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE); 83 iv_sg = &rctx->iv_sg; 84 iv_len = DES3_EDE_BLOCK_SIZE; 85 sg_init_one(iv_sg, rctx->iv, iv_len); 86 } 87 88 memset(&rctx->cmd, 0, sizeof(rctx->cmd)); 89 INIT_LIST_HEAD(&rctx->cmd.entry); 90 rctx->cmd.engine = CCP_ENGINE_DES3; 91 rctx->cmd.u.des3.type = ctx->u.des3.type; 92 rctx->cmd.u.des3.mode = ctx->u.des3.mode; 93 rctx->cmd.u.des3.action = (encrypt) 94 ? CCP_DES3_ACTION_ENCRYPT 95 : CCP_DES3_ACTION_DECRYPT; 96 rctx->cmd.u.des3.key = &ctx->u.des3.key_sg; 97 rctx->cmd.u.des3.key_len = ctx->u.des3.key_len; 98 rctx->cmd.u.des3.iv = iv_sg; 99 rctx->cmd.u.des3.iv_len = iv_len; 100 rctx->cmd.u.des3.src = req->src; 101 rctx->cmd.u.des3.src_len = req->cryptlen; 102 rctx->cmd.u.des3.dst = req->dst; 103 104 return ccp_crypto_enqueue_request(&req->base, &rctx->cmd); 105 } 106 107 static int ccp_des3_encrypt(struct skcipher_request *req) 108 { 109 return ccp_des3_crypt(req, true); 110 } 111 112 static int ccp_des3_decrypt(struct skcipher_request *req) 113 { 114 return ccp_des3_crypt(req, false); 115 } 116 117 static int ccp_des3_init_tfm(struct crypto_skcipher *tfm) 118 { 119 struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm); 120 121 ctx->complete = ccp_des3_complete; 122 ctx->u.des3.key_len = 0; 123 124 crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct ccp_des3_req_ctx)); 125 126 return 0; 127 } 128 129 static const struct skcipher_alg ccp_des3_defaults = { 130 .setkey = ccp_des3_setkey, 131 .encrypt = ccp_des3_encrypt, 132 .decrypt = ccp_des3_decrypt, 133 .min_keysize = DES3_EDE_KEY_SIZE, 134 .max_keysize = DES3_EDE_KEY_SIZE, 135 .init = ccp_des3_init_tfm, 136 137 .base.cra_flags = CRYPTO_ALG_ASYNC | 138 CRYPTO_ALG_ALLOCATES_MEMORY | 139 CRYPTO_ALG_KERN_DRIVER_ONLY | 140 CRYPTO_ALG_NEED_FALLBACK, 141 .base.cra_blocksize = DES3_EDE_BLOCK_SIZE, 142 .base.cra_ctxsize = sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING, 143 .base.cra_priority = CCP_CRA_PRIORITY, 144 .base.cra_module = THIS_MODULE, 145 }; 146 147 struct ccp_des3_def { 148 enum ccp_des3_mode mode; 149 unsigned int version; 150 const char *name; 151 const char *driver_name; 152 unsigned int blocksize; 153 unsigned int ivsize; 154 const struct skcipher_alg *alg_defaults; 155 }; 156 157 static const struct ccp_des3_def des3_algs[] = { 158 { 159 .mode = CCP_DES3_MODE_ECB, 160 .version = CCP_VERSION(5, 0), 161 .name = "ecb(des3_ede)", 162 .driver_name = "ecb-des3-ccp", 163 .blocksize = DES3_EDE_BLOCK_SIZE, 164 .ivsize = 0, 165 .alg_defaults = &ccp_des3_defaults, 166 }, 167 { 168 .mode = CCP_DES3_MODE_CBC, 169 .version = CCP_VERSION(5, 0), 170 .name = "cbc(des3_ede)", 171 .driver_name = "cbc-des3-ccp", 172 .blocksize = DES3_EDE_BLOCK_SIZE, 173 .ivsize = DES3_EDE_BLOCK_SIZE, 174 .alg_defaults = &ccp_des3_defaults, 175 }, 176 }; 177 178 static int ccp_register_des3_alg(struct list_head *head, 179 const struct ccp_des3_def *def) 180 { 181 struct ccp_crypto_skcipher_alg *ccp_alg; 182 struct skcipher_alg *alg; 183 int ret; 184 185 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); 186 if (!ccp_alg) 187 return -ENOMEM; 188 189 INIT_LIST_HEAD(&ccp_alg->entry); 190 191 ccp_alg->mode = def->mode; 192 193 /* Copy the defaults and override as necessary */ 194 alg = &ccp_alg->alg; 195 *alg = *def->alg_defaults; 196 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 197 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 198 def->driver_name); 199 alg->base.cra_blocksize = def->blocksize; 200 alg->ivsize = def->ivsize; 201 202 ret = crypto_register_skcipher(alg); 203 if (ret) { 204 pr_err("%s skcipher algorithm registration error (%d)\n", 205 alg->base.cra_name, ret); 206 kfree(ccp_alg); 207 return ret; 208 } 209 210 list_add(&ccp_alg->entry, head); 211 212 return 0; 213 } 214 215 int ccp_register_des3_algs(struct list_head *head) 216 { 217 int i, ret; 218 unsigned int ccpversion = ccp_version(); 219 220 for (i = 0; i < ARRAY_SIZE(des3_algs); i++) { 221 if (des3_algs[i].version > ccpversion) 222 continue; 223 ret = ccp_register_des3_alg(head, &des3_algs[i]); 224 if (ret) 225 return ret; 226 } 227 228 return 0; 229 } 230