2 * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support
4 * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
6 * Author: Gary R Hook <gary.hook@amd.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/delay.h>
16 #include <linux/scatterlist.h>
17 #include <linux/crypto.h>
18 #include <crypto/internal/aead.h>
19 #include <crypto/algapi.h>
20 #include <crypto/aes.h>
21 #include <crypto/ctr.h>
22 #include <crypto/gcm.h>
23 #include <crypto/scatterwalk.h>
25 #include "ccp-crypto.h"
27 static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret)
32 static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
35 struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
39 ctx->u.aes.type = CCP_AES_TYPE_128;
42 ctx->u.aes.type = CCP_AES_TYPE_192;
45 ctx->u.aes.type = CCP_AES_TYPE_256;
48 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
52 ctx->u.aes.mode = CCP_AES_MODE_GCM;
53 ctx->u.aes.key_len = key_len;
55 memcpy(ctx->u.aes.key, key, key_len);
56 sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
61 static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm,
62 unsigned int authsize)
67 static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt)
69 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
70 struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
71 struct ccp_aes_req_ctx *rctx = aead_request_ctx(req);
72 struct scatterlist *iv_sg = NULL;
73 unsigned int iv_len = 0;
77 if (!ctx->u.aes.key_len)
80 if (ctx->u.aes.mode != CCP_AES_MODE_GCM)
88 * plaintext/ciphertext input
92 * Destination+tag buffer
95 /* Prepare the IV: 12 bytes + an integer (counter) */
96 memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE);
97 for (i = 0; i < 3; i++)
98 rctx->iv[i + GCM_AES_IV_SIZE] = 0;
99 rctx->iv[AES_BLOCK_SIZE - 1] = 1;
101 /* Set up a scatterlist for the IV */
102 iv_sg = &rctx->iv_sg;
103 iv_len = AES_BLOCK_SIZE;
104 sg_init_one(iv_sg, rctx->iv, iv_len);
106 /* The AAD + plaintext are concatenated in the src buffer */
107 memset(&rctx->cmd, 0, sizeof(rctx->cmd));
108 INIT_LIST_HEAD(&rctx->cmd.entry);
109 rctx->cmd.engine = CCP_ENGINE_AES;
110 rctx->cmd.u.aes.type = ctx->u.aes.type;
111 rctx->cmd.u.aes.mode = ctx->u.aes.mode;
112 rctx->cmd.u.aes.action = encrypt;
113 rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
114 rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
115 rctx->cmd.u.aes.iv = iv_sg;
116 rctx->cmd.u.aes.iv_len = iv_len;
117 rctx->cmd.u.aes.src = req->src;
118 rctx->cmd.u.aes.src_len = req->cryptlen;
119 rctx->cmd.u.aes.aad_len = req->assoclen;
121 /* The cipher text + the tag are in the dst buffer */
122 rctx->cmd.u.aes.dst = req->dst;
124 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
129 static int ccp_aes_gcm_encrypt(struct aead_request *req)
131 return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT);
134 static int ccp_aes_gcm_decrypt(struct aead_request *req)
136 return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT);
139 static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm)
141 struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
143 ctx->complete = ccp_aes_gcm_complete;
144 ctx->u.aes.key_len = 0;
146 crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
151 static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm)
155 static struct aead_alg ccp_aes_gcm_defaults = {
156 .setkey = ccp_aes_gcm_setkey,
157 .setauthsize = ccp_aes_gcm_setauthsize,
158 .encrypt = ccp_aes_gcm_encrypt,
159 .decrypt = ccp_aes_gcm_decrypt,
160 .init = ccp_aes_gcm_cra_init,
161 .ivsize = GCM_AES_IV_SIZE,
162 .maxauthsize = AES_BLOCK_SIZE,
164 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
166 CRYPTO_ALG_KERN_DRIVER_ONLY |
167 CRYPTO_ALG_NEED_FALLBACK,
168 .cra_blocksize = AES_BLOCK_SIZE,
169 .cra_ctxsize = sizeof(struct ccp_ctx),
170 .cra_priority = CCP_CRA_PRIORITY,
171 .cra_type = &crypto_ablkcipher_type,
172 .cra_exit = ccp_aes_gcm_cra_exit,
173 .cra_module = THIS_MODULE,
177 struct ccp_aes_aead_def {
178 enum ccp_aes_mode mode;
179 unsigned int version;
181 const char *driver_name;
182 unsigned int blocksize;
184 struct aead_alg *alg_defaults;
187 static struct ccp_aes_aead_def aes_aead_algs[] = {
189 .mode = CCP_AES_MODE_GHASH,
190 .version = CCP_VERSION(5, 0),
192 .driver_name = "gcm-aes-ccp",
194 .ivsize = AES_BLOCK_SIZE,
195 .alg_defaults = &ccp_aes_gcm_defaults,
199 static int ccp_register_aes_aead(struct list_head *head,
200 const struct ccp_aes_aead_def *def)
202 struct ccp_crypto_aead *ccp_aead;
203 struct aead_alg *alg;
206 ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL);
210 INIT_LIST_HEAD(&ccp_aead->entry);
212 ccp_aead->mode = def->mode;
214 /* Copy the defaults and override as necessary */
215 alg = &ccp_aead->alg;
216 *alg = *def->alg_defaults;
217 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
218 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
220 alg->base.cra_blocksize = def->blocksize;
221 alg->base.cra_ablkcipher.ivsize = def->ivsize;
223 ret = crypto_register_aead(alg);
225 pr_err("%s ablkcipher algorithm registration error (%d)\n",
226 alg->base.cra_name, ret);
231 list_add(&ccp_aead->entry, head);
236 int ccp_register_aes_aeads(struct list_head *head)
239 unsigned int ccpversion = ccp_version();
241 for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) {
242 if (aes_aead_algs[i].version > ccpversion)
244 ret = ccp_register_aes_aead(head, &aes_aead_algs[i]);