1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support
5 * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
7 * Author: Gary R Hook <gary.hook@amd.com>
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/internal/aead.h>
16 #include <crypto/algapi.h>
17 #include <crypto/aes.h>
18 #include <crypto/ctr.h>
19 #include <crypto/gcm.h>
20 #include <crypto/scatterwalk.h>
22 #include "ccp-crypto.h"
24 static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret)
29 static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
32 struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
36 ctx->u.aes.type = CCP_AES_TYPE_128;
39 ctx->u.aes.type = CCP_AES_TYPE_192;
42 ctx->u.aes.type = CCP_AES_TYPE_256;
45 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
49 ctx->u.aes.mode = CCP_AES_MODE_GCM;
50 ctx->u.aes.key_len = key_len;
52 memcpy(ctx->u.aes.key, key, key_len);
53 sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
58 static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm,
59 unsigned int authsize)
64 static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt)
66 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
67 struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
68 struct ccp_aes_req_ctx *rctx = aead_request_ctx(req);
69 struct scatterlist *iv_sg = NULL;
70 unsigned int iv_len = 0;
74 if (!ctx->u.aes.key_len)
77 if (ctx->u.aes.mode != CCP_AES_MODE_GCM)
85 * plaintext/ciphertext input
89 * Destination+tag buffer
92 /* Prepare the IV: 12 bytes + an integer (counter) */
93 memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE);
94 for (i = 0; i < 3; i++)
95 rctx->iv[i + GCM_AES_IV_SIZE] = 0;
96 rctx->iv[AES_BLOCK_SIZE - 1] = 1;
98 /* Set up a scatterlist for the IV */
100 iv_len = AES_BLOCK_SIZE;
101 sg_init_one(iv_sg, rctx->iv, iv_len);
103 /* The AAD + plaintext are concatenated in the src buffer */
104 memset(&rctx->cmd, 0, sizeof(rctx->cmd));
105 INIT_LIST_HEAD(&rctx->cmd.entry);
106 rctx->cmd.engine = CCP_ENGINE_AES;
107 rctx->cmd.u.aes.type = ctx->u.aes.type;
108 rctx->cmd.u.aes.mode = ctx->u.aes.mode;
109 rctx->cmd.u.aes.action = encrypt;
110 rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
111 rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
112 rctx->cmd.u.aes.iv = iv_sg;
113 rctx->cmd.u.aes.iv_len = iv_len;
114 rctx->cmd.u.aes.src = req->src;
115 rctx->cmd.u.aes.src_len = req->cryptlen;
116 rctx->cmd.u.aes.aad_len = req->assoclen;
118 /* The cipher text + the tag are in the dst buffer */
119 rctx->cmd.u.aes.dst = req->dst;
121 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
126 static int ccp_aes_gcm_encrypt(struct aead_request *req)
128 return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT);
131 static int ccp_aes_gcm_decrypt(struct aead_request *req)
133 return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT);
136 static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm)
138 struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
140 ctx->complete = ccp_aes_gcm_complete;
141 ctx->u.aes.key_len = 0;
143 crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
148 static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm)
152 static struct aead_alg ccp_aes_gcm_defaults = {
153 .setkey = ccp_aes_gcm_setkey,
154 .setauthsize = ccp_aes_gcm_setauthsize,
155 .encrypt = ccp_aes_gcm_encrypt,
156 .decrypt = ccp_aes_gcm_decrypt,
157 .init = ccp_aes_gcm_cra_init,
158 .ivsize = GCM_AES_IV_SIZE,
159 .maxauthsize = AES_BLOCK_SIZE,
161 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
163 CRYPTO_ALG_KERN_DRIVER_ONLY |
164 CRYPTO_ALG_NEED_FALLBACK,
165 .cra_blocksize = AES_BLOCK_SIZE,
166 .cra_ctxsize = sizeof(struct ccp_ctx),
167 .cra_priority = CCP_CRA_PRIORITY,
168 .cra_type = &crypto_ablkcipher_type,
169 .cra_exit = ccp_aes_gcm_cra_exit,
170 .cra_module = THIS_MODULE,
174 struct ccp_aes_aead_def {
175 enum ccp_aes_mode mode;
176 unsigned int version;
178 const char *driver_name;
179 unsigned int blocksize;
181 struct aead_alg *alg_defaults;
184 static struct ccp_aes_aead_def aes_aead_algs[] = {
186 .mode = CCP_AES_MODE_GHASH,
187 .version = CCP_VERSION(5, 0),
189 .driver_name = "gcm-aes-ccp",
191 .ivsize = AES_BLOCK_SIZE,
192 .alg_defaults = &ccp_aes_gcm_defaults,
196 static int ccp_register_aes_aead(struct list_head *head,
197 const struct ccp_aes_aead_def *def)
199 struct ccp_crypto_aead *ccp_aead;
200 struct aead_alg *alg;
203 ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL);
207 INIT_LIST_HEAD(&ccp_aead->entry);
209 ccp_aead->mode = def->mode;
211 /* Copy the defaults and override as necessary */
212 alg = &ccp_aead->alg;
213 *alg = *def->alg_defaults;
214 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
215 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
217 alg->base.cra_blocksize = def->blocksize;
218 alg->base.cra_ablkcipher.ivsize = def->ivsize;
220 ret = crypto_register_aead(alg);
222 pr_err("%s ablkcipher algorithm registration error (%d)\n",
223 alg->base.cra_name, ret);
228 list_add(&ccp_aead->entry, head);
233 int ccp_register_aes_aeads(struct list_head *head)
236 unsigned int ccpversion = ccp_version();
238 for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) {
239 if (aes_aead_algs[i].version > ccpversion)
241 ret = ccp_register_aes_aead(head, &aes_aead_algs[i]);