| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support |
| * |
| * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. |
| * |
| * Author: Gary R Hook <ghook@amd.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/delay.h> |
| #include <linux/scatterlist.h> |
| #include <linux/crypto.h> |
| #include <crypto/algapi.h> |
| #include <crypto/scatterwalk.h> |
| #include <crypto/internal/des.h> |
| |
| #include "ccp-crypto.h" |
| |
| static int ccp_des3_complete(struct crypto_async_request *async_req, int ret) |
| { |
| struct ablkcipher_request *req = ablkcipher_request_cast(async_req); |
| struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm); |
| struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req); |
| |
| if (ret) |
| return ret; |
| |
| if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) |
| memcpy(req->info, rctx->iv, DES3_EDE_BLOCK_SIZE); |
| |
| return 0; |
| } |
| |
| static int ccp_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
| unsigned int key_len) |
| { |
| struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm)); |
| struct ccp_crypto_ablkcipher_alg *alg = |
| ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm)); |
| int err; |
| |
| err = verify_ablkcipher_des3_key(tfm, key); |
| if (err) |
| return err; |
| |
| /* It's not clear that there is any support for a keysize of 112. |
| * If needed, the caller should make K1 == K3 |
| */ |
| ctx->u.des3.type = CCP_DES3_TYPE_168; |
| ctx->u.des3.mode = alg->mode; |
| ctx->u.des3.key_len = key_len; |
| |
| memcpy(ctx->u.des3.key, key, key_len); |
| sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len); |
| |
| return 0; |
| } |
| |
| static int ccp_des3_crypt(struct ablkcipher_request *req, bool encrypt) |
| { |
| struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm); |
| struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req); |
| struct scatterlist *iv_sg = NULL; |
| unsigned int iv_len = 0; |
| int ret; |
| |
| if (!ctx->u.des3.key_len) |
| return -EINVAL; |
| |
| if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) || |
| (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) && |
| (req->nbytes & (DES3_EDE_BLOCK_SIZE - 1))) |
| return -EINVAL; |
| |
| if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) { |
| if (!req->info) |
| return -EINVAL; |
| |
| memcpy(rctx->iv, req->info, DES3_EDE_BLOCK_SIZE); |
| iv_sg = &rctx->iv_sg; |
| iv_len = DES3_EDE_BLOCK_SIZE; |
| sg_init_one(iv_sg, rctx->iv, iv_len); |
| } |
| |
| memset(&rctx->cmd, 0, sizeof(rctx->cmd)); |
| INIT_LIST_HEAD(&rctx->cmd.entry); |
| rctx->cmd.engine = CCP_ENGINE_DES3; |
| rctx->cmd.u.des3.type = ctx->u.des3.type; |
| rctx->cmd.u.des3.mode = ctx->u.des3.mode; |
| rctx->cmd.u.des3.action = (encrypt) |
| ? CCP_DES3_ACTION_ENCRYPT |
| : CCP_DES3_ACTION_DECRYPT; |
| rctx->cmd.u.des3.key = &ctx->u.des3.key_sg; |
| rctx->cmd.u.des3.key_len = ctx->u.des3.key_len; |
| rctx->cmd.u.des3.iv = iv_sg; |
| rctx->cmd.u.des3.iv_len = iv_len; |
| rctx->cmd.u.des3.src = req->src; |
| rctx->cmd.u.des3.src_len = req->nbytes; |
| rctx->cmd.u.des3.dst = req->dst; |
| |
| ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); |
| |
| return ret; |
| } |
| |
| static int ccp_des3_encrypt(struct ablkcipher_request *req) |
| { |
| return ccp_des3_crypt(req, true); |
| } |
| |
| static int ccp_des3_decrypt(struct ablkcipher_request *req) |
| { |
| return ccp_des3_crypt(req, false); |
| } |
| |
| static int ccp_des3_cra_init(struct crypto_tfm *tfm) |
| { |
| struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); |
| |
| ctx->complete = ccp_des3_complete; |
| ctx->u.des3.key_len = 0; |
| |
| tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_des3_req_ctx); |
| |
| return 0; |
| } |
| |
| static void ccp_des3_cra_exit(struct crypto_tfm *tfm) |
| { |
| } |
| |
| static struct crypto_alg ccp_des3_defaults = { |
| .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | |
| CRYPTO_ALG_ASYNC | |
| CRYPTO_ALG_KERN_DRIVER_ONLY | |
| CRYPTO_ALG_NEED_FALLBACK, |
| .cra_blocksize = DES3_EDE_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct ccp_ctx), |
| .cra_priority = CCP_CRA_PRIORITY, |
| .cra_type = &crypto_ablkcipher_type, |
| .cra_init = ccp_des3_cra_init, |
| .cra_exit = ccp_des3_cra_exit, |
| .cra_module = THIS_MODULE, |
| .cra_ablkcipher = { |
| .setkey = ccp_des3_setkey, |
| .encrypt = ccp_des3_encrypt, |
| .decrypt = ccp_des3_decrypt, |
| .min_keysize = DES3_EDE_KEY_SIZE, |
| .max_keysize = DES3_EDE_KEY_SIZE, |
| }, |
| }; |
| |
| struct ccp_des3_def { |
| enum ccp_des3_mode mode; |
| unsigned int version; |
| const char *name; |
| const char *driver_name; |
| unsigned int blocksize; |
| unsigned int ivsize; |
| struct crypto_alg *alg_defaults; |
| }; |
| |
| static struct ccp_des3_def des3_algs[] = { |
| { |
| .mode = CCP_DES3_MODE_ECB, |
| .version = CCP_VERSION(5, 0), |
| .name = "ecb(des3_ede)", |
| .driver_name = "ecb-des3-ccp", |
| .blocksize = DES3_EDE_BLOCK_SIZE, |
| .ivsize = 0, |
| .alg_defaults = &ccp_des3_defaults, |
| }, |
| { |
| .mode = CCP_DES3_MODE_CBC, |
| .version = CCP_VERSION(5, 0), |
| .name = "cbc(des3_ede)", |
| .driver_name = "cbc-des3-ccp", |
| .blocksize = DES3_EDE_BLOCK_SIZE, |
| .ivsize = DES3_EDE_BLOCK_SIZE, |
| .alg_defaults = &ccp_des3_defaults, |
| }, |
| }; |
| |
| static int ccp_register_des3_alg(struct list_head *head, |
| const struct ccp_des3_def *def) |
| { |
| struct ccp_crypto_ablkcipher_alg *ccp_alg; |
| struct crypto_alg *alg; |
| int ret; |
| |
| ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); |
| if (!ccp_alg) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&ccp_alg->entry); |
| |
| ccp_alg->mode = def->mode; |
| |
| /* Copy the defaults and override as necessary */ |
| alg = &ccp_alg->alg; |
| *alg = *def->alg_defaults; |
| snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); |
| snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", |
| def->driver_name); |
| alg->cra_blocksize = def->blocksize; |
| alg->cra_ablkcipher.ivsize = def->ivsize; |
| |
| ret = crypto_register_alg(alg); |
| if (ret) { |
| pr_err("%s ablkcipher algorithm registration error (%d)\n", |
| alg->cra_name, ret); |
| kfree(ccp_alg); |
| return ret; |
| } |
| |
| list_add(&ccp_alg->entry, head); |
| |
| return 0; |
| } |
| |
| int ccp_register_des3_algs(struct list_head *head) |
| { |
| int i, ret; |
| unsigned int ccpversion = ccp_version(); |
| |
| for (i = 0; i < ARRAY_SIZE(des3_algs); i++) { |
| if (des3_algs[i].version > ccpversion) |
| continue; |
| ret = ccp_register_des3_alg(head, &des3_algs[i]); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |