| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support |
| * |
| * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. |
| * |
| * Author: Gary R Hook <gary.hook@amd.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/delay.h> |
| #include <linux/scatterlist.h> |
| #include <linux/crypto.h> |
| #include <crypto/internal/aead.h> |
| #include <crypto/algapi.h> |
| #include <crypto/aes.h> |
| #include <crypto/ctr.h> |
| #include <crypto/gcm.h> |
| #include <crypto/scatterwalk.h> |
| |
| #include "ccp-crypto.h" |
| |
| static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret) |
| { |
| return ret; |
| } |
| |
| static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key, |
| unsigned int key_len) |
| { |
| struct ccp_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| switch (key_len) { |
| case AES_KEYSIZE_128: |
| ctx->u.aes.type = CCP_AES_TYPE_128; |
| break; |
| case AES_KEYSIZE_192: |
| ctx->u.aes.type = CCP_AES_TYPE_192; |
| break; |
| case AES_KEYSIZE_256: |
| ctx->u.aes.type = CCP_AES_TYPE_256; |
| break; |
| default: |
| crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| return -EINVAL; |
| } |
| |
| ctx->u.aes.mode = CCP_AES_MODE_GCM; |
| ctx->u.aes.key_len = key_len; |
| |
| memcpy(ctx->u.aes.key, key, key_len); |
| sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); |
| |
| return 0; |
| } |
| |
| static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm, |
| unsigned int authsize) |
| { |
| switch (authsize) { |
| case 16: |
| case 15: |
| case 14: |
| case 13: |
| case 12: |
| case 8: |
| case 4: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt) |
| { |
| struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| struct ccp_ctx *ctx = crypto_aead_ctx(tfm); |
| struct ccp_aes_req_ctx *rctx = aead_request_ctx(req); |
| struct scatterlist *iv_sg = NULL; |
| unsigned int iv_len = 0; |
| int i; |
| int ret = 0; |
| |
| if (!ctx->u.aes.key_len) |
| return -EINVAL; |
| |
| if (ctx->u.aes.mode != CCP_AES_MODE_GCM) |
| return -EINVAL; |
| |
| if (!req->iv) |
| return -EINVAL; |
| |
| /* |
| * 5 parts: |
| * plaintext/ciphertext input |
| * AAD |
| * key |
| * IV |
| * Destination+tag buffer |
| */ |
| |
| /* Prepare the IV: 12 bytes + an integer (counter) */ |
| memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE); |
| for (i = 0; i < 3; i++) |
| rctx->iv[i + GCM_AES_IV_SIZE] = 0; |
| rctx->iv[AES_BLOCK_SIZE - 1] = 1; |
| |
| /* Set up a scatterlist for the IV */ |
| iv_sg = &rctx->iv_sg; |
| iv_len = AES_BLOCK_SIZE; |
| sg_init_one(iv_sg, rctx->iv, iv_len); |
| |
| /* The AAD + plaintext are concatenated in the src buffer */ |
| memset(&rctx->cmd, 0, sizeof(rctx->cmd)); |
| INIT_LIST_HEAD(&rctx->cmd.entry); |
| rctx->cmd.engine = CCP_ENGINE_AES; |
| rctx->cmd.u.aes.authsize = crypto_aead_authsize(tfm); |
| rctx->cmd.u.aes.type = ctx->u.aes.type; |
| rctx->cmd.u.aes.mode = ctx->u.aes.mode; |
| rctx->cmd.u.aes.action = encrypt; |
| rctx->cmd.u.aes.key = &ctx->u.aes.key_sg; |
| rctx->cmd.u.aes.key_len = ctx->u.aes.key_len; |
| rctx->cmd.u.aes.iv = iv_sg; |
| rctx->cmd.u.aes.iv_len = iv_len; |
| rctx->cmd.u.aes.src = req->src; |
| rctx->cmd.u.aes.src_len = req->cryptlen; |
| rctx->cmd.u.aes.aad_len = req->assoclen; |
| |
| /* The cipher text + the tag are in the dst buffer */ |
| rctx->cmd.u.aes.dst = req->dst; |
| |
| ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); |
| |
| return ret; |
| } |
| |
| static int ccp_aes_gcm_encrypt(struct aead_request *req) |
| { |
| return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT); |
| } |
| |
| static int ccp_aes_gcm_decrypt(struct aead_request *req) |
| { |
| return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT); |
| } |
| |
| static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm) |
| { |
| struct ccp_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| ctx->complete = ccp_aes_gcm_complete; |
| ctx->u.aes.key_len = 0; |
| |
| crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx)); |
| |
| return 0; |
| } |
| |
| static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm) |
| { |
| } |
| |
| static struct aead_alg ccp_aes_gcm_defaults = { |
| .setkey = ccp_aes_gcm_setkey, |
| .setauthsize = ccp_aes_gcm_setauthsize, |
| .encrypt = ccp_aes_gcm_encrypt, |
| .decrypt = ccp_aes_gcm_decrypt, |
| .init = ccp_aes_gcm_cra_init, |
| .ivsize = GCM_AES_IV_SIZE, |
| .maxauthsize = AES_BLOCK_SIZE, |
| .base = { |
| .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | |
| CRYPTO_ALG_ASYNC | |
| CRYPTO_ALG_KERN_DRIVER_ONLY | |
| CRYPTO_ALG_NEED_FALLBACK, |
| .cra_blocksize = AES_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct ccp_ctx), |
| .cra_priority = CCP_CRA_PRIORITY, |
| .cra_type = &crypto_ablkcipher_type, |
| .cra_exit = ccp_aes_gcm_cra_exit, |
| .cra_module = THIS_MODULE, |
| }, |
| }; |
| |
| struct ccp_aes_aead_def { |
| enum ccp_aes_mode mode; |
| unsigned int version; |
| const char *name; |
| const char *driver_name; |
| unsigned int blocksize; |
| unsigned int ivsize; |
| struct aead_alg *alg_defaults; |
| }; |
| |
| static struct ccp_aes_aead_def aes_aead_algs[] = { |
| { |
| .mode = CCP_AES_MODE_GHASH, |
| .version = CCP_VERSION(5, 0), |
| .name = "gcm(aes)", |
| .driver_name = "gcm-aes-ccp", |
| .blocksize = 1, |
| .ivsize = AES_BLOCK_SIZE, |
| .alg_defaults = &ccp_aes_gcm_defaults, |
| }, |
| }; |
| |
| static int ccp_register_aes_aead(struct list_head *head, |
| const struct ccp_aes_aead_def *def) |
| { |
| struct ccp_crypto_aead *ccp_aead; |
| struct aead_alg *alg; |
| int ret; |
| |
| ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL); |
| if (!ccp_aead) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&ccp_aead->entry); |
| |
| ccp_aead->mode = def->mode; |
| |
| /* Copy the defaults and override as necessary */ |
| alg = &ccp_aead->alg; |
| *alg = *def->alg_defaults; |
| snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); |
| snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", |
| def->driver_name); |
| alg->base.cra_blocksize = def->blocksize; |
| alg->base.cra_ablkcipher.ivsize = def->ivsize; |
| |
| ret = crypto_register_aead(alg); |
| if (ret) { |
| pr_err("%s ablkcipher algorithm registration error (%d)\n", |
| alg->base.cra_name, ret); |
| kfree(ccp_aead); |
| return ret; |
| } |
| |
| list_add(&ccp_aead->entry, head); |
| |
| return 0; |
| } |
| |
| int ccp_register_aes_aeads(struct list_head *head) |
| { |
| int i, ret; |
| unsigned int ccpversion = ccp_version(); |
| |
| for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) { |
| if (aes_aead_algs[i].version > ccpversion) |
| continue; |
| ret = ccp_register_aes_aead(head, &aes_aead_algs[i]); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |