2019-06-04 11:11:33 +03:00
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// SPDX-License-Identifier: GPL-2.0-only
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2017-03-15 21:21:01 +03:00
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/*
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* AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support
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*
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2017-07-17 23:00:49 +03:00
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* Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
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2017-03-15 21:21:01 +03:00
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*
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* Author: Gary R Hook <gary.hook@amd.com>
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/scatterlist.h>
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#include <linux/crypto.h>
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#include <crypto/internal/aead.h>
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#include <crypto/algapi.h>
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#include <crypto/aes.h>
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#include <crypto/ctr.h>
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2017-08-22 11:08:10 +03:00
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#include <crypto/gcm.h>
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2017-03-15 21:21:01 +03:00
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#include <crypto/scatterwalk.h>
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#include "ccp-crypto.h"
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static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret)
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{
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return ret;
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}
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static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
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switch (key_len) {
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case AES_KEYSIZE_128:
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ctx->u.aes.type = CCP_AES_TYPE_128;
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break;
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case AES_KEYSIZE_192:
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ctx->u.aes.type = CCP_AES_TYPE_192;
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break;
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case AES_KEYSIZE_256:
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ctx->u.aes.type = CCP_AES_TYPE_256;
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break;
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default:
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return -EINVAL;
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}
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ctx->u.aes.mode = CCP_AES_MODE_GCM;
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ctx->u.aes.key_len = key_len;
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memcpy(ctx->u.aes.key, key, key_len);
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sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
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return 0;
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}
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static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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2019-07-30 19:05:24 +03:00
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switch (authsize) {
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case 16:
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case 15:
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case 14:
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case 13:
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case 12:
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case 8:
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case 4:
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break;
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default:
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return -EINVAL;
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}
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2017-03-15 21:21:01 +03:00
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return 0;
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}
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static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
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struct ccp_aes_req_ctx *rctx = aead_request_ctx(req);
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struct scatterlist *iv_sg = NULL;
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unsigned int iv_len = 0;
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int i;
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int ret = 0;
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if (!ctx->u.aes.key_len)
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return -EINVAL;
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if (ctx->u.aes.mode != CCP_AES_MODE_GCM)
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return -EINVAL;
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if (!req->iv)
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return -EINVAL;
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/*
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* 5 parts:
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* plaintext/ciphertext input
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* AAD
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* key
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* IV
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* Destination+tag buffer
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*/
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/* Prepare the IV: 12 bytes + an integer (counter) */
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2017-08-22 11:08:10 +03:00
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memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE);
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2017-03-15 21:21:01 +03:00
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for (i = 0; i < 3; i++)
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2017-08-22 11:08:10 +03:00
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rctx->iv[i + GCM_AES_IV_SIZE] = 0;
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2017-03-15 21:21:01 +03:00
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rctx->iv[AES_BLOCK_SIZE - 1] = 1;
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/* Set up a scatterlist for the IV */
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iv_sg = &rctx->iv_sg;
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iv_len = AES_BLOCK_SIZE;
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sg_init_one(iv_sg, rctx->iv, iv_len);
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/* The AAD + plaintext are concatenated in the src buffer */
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memset(&rctx->cmd, 0, sizeof(rctx->cmd));
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INIT_LIST_HEAD(&rctx->cmd.entry);
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rctx->cmd.engine = CCP_ENGINE_AES;
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2019-07-30 19:05:24 +03:00
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rctx->cmd.u.aes.authsize = crypto_aead_authsize(tfm);
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2017-03-15 21:21:01 +03:00
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rctx->cmd.u.aes.type = ctx->u.aes.type;
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rctx->cmd.u.aes.mode = ctx->u.aes.mode;
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rctx->cmd.u.aes.action = encrypt;
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rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
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rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
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rctx->cmd.u.aes.iv = iv_sg;
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rctx->cmd.u.aes.iv_len = iv_len;
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rctx->cmd.u.aes.src = req->src;
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rctx->cmd.u.aes.src_len = req->cryptlen;
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rctx->cmd.u.aes.aad_len = req->assoclen;
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/* The cipher text + the tag are in the dst buffer */
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rctx->cmd.u.aes.dst = req->dst;
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ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
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return ret;
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}
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static int ccp_aes_gcm_encrypt(struct aead_request *req)
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{
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return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT);
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}
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static int ccp_aes_gcm_decrypt(struct aead_request *req)
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{
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return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT);
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}
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static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm)
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{
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struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
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ctx->complete = ccp_aes_gcm_complete;
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ctx->u.aes.key_len = 0;
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crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
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return 0;
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}
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static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm)
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{
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}
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static struct aead_alg ccp_aes_gcm_defaults = {
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.setkey = ccp_aes_gcm_setkey,
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.setauthsize = ccp_aes_gcm_setauthsize,
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.encrypt = ccp_aes_gcm_encrypt,
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.decrypt = ccp_aes_gcm_decrypt,
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.init = ccp_aes_gcm_cra_init,
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2017-08-22 11:08:10 +03:00
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.ivsize = GCM_AES_IV_SIZE,
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2017-03-15 21:21:01 +03:00
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.maxauthsize = AES_BLOCK_SIZE,
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.base = {
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2019-11-09 20:09:29 +03:00
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.cra_flags = CRYPTO_ALG_ASYNC |
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2020-07-10 09:20:41 +03:00
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CRYPTO_ALG_ALLOCATES_MEMORY |
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2017-03-15 21:21:01 +03:00
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CRYPTO_ALG_KERN_DRIVER_ONLY |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct ccp_ctx),
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.cra_priority = CCP_CRA_PRIORITY,
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.cra_exit = ccp_aes_gcm_cra_exit,
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.cra_module = THIS_MODULE,
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},
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};
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struct ccp_aes_aead_def {
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enum ccp_aes_mode mode;
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unsigned int version;
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const char *name;
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const char *driver_name;
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unsigned int blocksize;
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unsigned int ivsize;
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struct aead_alg *alg_defaults;
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};
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static struct ccp_aes_aead_def aes_aead_algs[] = {
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{
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.mode = CCP_AES_MODE_GHASH,
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.version = CCP_VERSION(5, 0),
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.name = "gcm(aes)",
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.driver_name = "gcm-aes-ccp",
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.blocksize = 1,
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.ivsize = AES_BLOCK_SIZE,
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.alg_defaults = &ccp_aes_gcm_defaults,
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},
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};
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static int ccp_register_aes_aead(struct list_head *head,
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const struct ccp_aes_aead_def *def)
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{
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struct ccp_crypto_aead *ccp_aead;
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struct aead_alg *alg;
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int ret;
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ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL);
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if (!ccp_aead)
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return -ENOMEM;
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INIT_LIST_HEAD(&ccp_aead->entry);
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ccp_aead->mode = def->mode;
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/* Copy the defaults and override as necessary */
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alg = &ccp_aead->alg;
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*alg = *def->alg_defaults;
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snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
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snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
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def->driver_name);
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alg->base.cra_blocksize = def->blocksize;
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ret = crypto_register_aead(alg);
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if (ret) {
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2019-11-09 20:09:29 +03:00
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pr_err("%s aead algorithm registration error (%d)\n",
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2017-03-15 21:21:01 +03:00
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alg->base.cra_name, ret);
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kfree(ccp_aead);
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return ret;
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}
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list_add(&ccp_aead->entry, head);
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return 0;
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}
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int ccp_register_aes_aeads(struct list_head *head)
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{
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int i, ret;
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unsigned int ccpversion = ccp_version();
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for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) {
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if (aes_aead_algs[i].version > ccpversion)
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continue;
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ret = ccp_register_aes_aead(head, &aes_aead_algs[i]);
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if (ret)
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return ret;
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}
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return 0;
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}
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