// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AMD Cryptographic Coprocessor (CCP) AES crypto API support
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*
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* Copyright (C) 2013-2019 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@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/algapi.h>
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#include <crypto/aes.h>
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#include <crypto/ctr.h>
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#include <crypto/scatterwalk.h>
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#include "ccp-crypto.h"
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static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
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{
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struct skcipher_request *req = skcipher_request_cast(async_req);
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struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
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if (ret)
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return ret;
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if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
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memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE);
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return 0;
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}
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static int ccp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
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struct ccp_ctx *ctx = crypto_skcipher_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 = alg->mode;
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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_crypt(struct skcipher_request *req, bool encrypt)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct ccp_aes_req_ctx *rctx = skcipher_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 ret;
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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_ECB) ||
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(ctx->u.aes.mode == CCP_AES_MODE_CBC)) &&
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(req->cryptlen & (AES_BLOCK_SIZE - 1)))
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return -EINVAL;
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if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
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if (!req->iv)
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return -EINVAL;
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memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE);
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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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}
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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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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 =
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(encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
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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.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_encrypt(struct skcipher_request *req)
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{
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return ccp_aes_crypt(req, true);
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}
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static int ccp_aes_decrypt(struct skcipher_request *req)
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{
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return ccp_aes_crypt(req, false);
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}
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static int ccp_aes_init_tfm(struct crypto_skcipher *tfm)
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{
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
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ctx->complete = ccp_aes_complete;
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ctx->u.aes.key_len = 0;
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crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
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return 0;
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}
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static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
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int ret)
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{
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struct skcipher_request *req = skcipher_request_cast(async_req);
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struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
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/* Restore the original pointer */
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req->iv = rctx->rfc3686_info;
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return ccp_aes_complete(async_req, ret);
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}
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static int ccp_aes_rfc3686_setkey(struct crypto_skcipher *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_skcipher_ctx(tfm);
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if (key_len < CTR_RFC3686_NONCE_SIZE)
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return -EINVAL;
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key_len -= CTR_RFC3686_NONCE_SIZE;
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memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);
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return ccp_aes_setkey(tfm, key, key_len);
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}
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static int ccp_aes_rfc3686_crypt(struct skcipher_request *req, bool encrypt)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
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u8 *iv;
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/* Initialize the CTR block */
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iv = rctx->rfc3686_iv;
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memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);
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iv += CTR_RFC3686_NONCE_SIZE;
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memcpy(iv, req->iv, CTR_RFC3686_IV_SIZE);
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iv += CTR_RFC3686_IV_SIZE;
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*(__be32 *)iv = cpu_to_be32(1);
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/* Point to the new IV */
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rctx->rfc3686_info = req->iv;
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req->iv = rctx->rfc3686_iv;
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return ccp_aes_crypt(req, encrypt);
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}
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static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req)
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{
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return ccp_aes_rfc3686_crypt(req, true);
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}
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static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req)
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{
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return ccp_aes_rfc3686_crypt(req, false);
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}
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static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm)
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{
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
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ctx->complete = ccp_aes_rfc3686_complete;
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ctx->u.aes.key_len = 0;
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crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
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return 0;
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}
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static const struct skcipher_alg ccp_aes_defaults = {
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.setkey = ccp_aes_setkey,
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.encrypt = ccp_aes_encrypt,
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.decrypt = ccp_aes_decrypt,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.init = ccp_aes_init_tfm,
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.base.cra_flags = CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_ALLOCATES_MEMORY |
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CRYPTO_ALG_KERN_DRIVER_ONLY |
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CRYPTO_ALG_NEED_FALLBACK,
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.base.cra_blocksize = AES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct ccp_ctx),
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.base.cra_priority = CCP_CRA_PRIORITY,
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.base.cra_module = THIS_MODULE,
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};
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static const struct skcipher_alg ccp_aes_rfc3686_defaults = {
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.setkey = ccp_aes_rfc3686_setkey,
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.encrypt = ccp_aes_rfc3686_encrypt,
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.decrypt = ccp_aes_rfc3686_decrypt,
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.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
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.init = ccp_aes_rfc3686_init_tfm,
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.base.cra_flags = CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_ALLOCATES_MEMORY |
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CRYPTO_ALG_KERN_DRIVER_ONLY |
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CRYPTO_ALG_NEED_FALLBACK,
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.base.cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct ccp_ctx),
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.base.cra_priority = CCP_CRA_PRIORITY,
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.base.cra_module = THIS_MODULE,
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};
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struct ccp_aes_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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const struct skcipher_alg *alg_defaults;
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};
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static struct ccp_aes_def aes_algs[] = {
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{
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.mode = CCP_AES_MODE_ECB,
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.version = CCP_VERSION(3, 0),
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.name = "ecb(aes)",
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.driver_name = "ecb-aes-ccp",
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.blocksize = AES_BLOCK_SIZE,
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.ivsize = 0,
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.alg_defaults = &ccp_aes_defaults,
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},
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{
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.mode = CCP_AES_MODE_CBC,
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.version = CCP_VERSION(3, 0),
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.name = "cbc(aes)",
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.driver_name = "cbc-aes-ccp",
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.blocksize = AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.alg_defaults = &ccp_aes_defaults,
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},
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{
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.mode = CCP_AES_MODE_CFB,
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.version = CCP_VERSION(3, 0),
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.name = "cfb(aes)",
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.driver_name = "cfb-aes-ccp",
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.blocksize = 1,
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.ivsize = AES_BLOCK_SIZE,
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.alg_defaults = &ccp_aes_defaults,
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},
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{
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.mode = CCP_AES_MODE_OFB,
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.version = CCP_VERSION(3, 0),
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.name = "ofb(aes)",
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.driver_name = "ofb-aes-ccp",
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.blocksize = 1,
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.ivsize = AES_BLOCK_SIZE,
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.alg_defaults = &ccp_aes_defaults,
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},
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{
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.mode = CCP_AES_MODE_CTR,
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.version = CCP_VERSION(3, 0),
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.name = "ctr(aes)",
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.driver_name = "ctr-aes-ccp",
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.blocksize = 1,
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.ivsize = AES_BLOCK_SIZE,
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.alg_defaults = &ccp_aes_defaults,
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},
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{
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.mode = CCP_AES_MODE_CTR,
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.version = CCP_VERSION(3, 0),
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.name = "rfc3686(ctr(aes))",
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.driver_name = "rfc3686-ctr-aes-ccp",
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.blocksize = 1,
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.ivsize = CTR_RFC3686_IV_SIZE,
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.alg_defaults = &ccp_aes_rfc3686_defaults,
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},
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};
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static int ccp_register_aes_alg(struct list_head *head,
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const struct ccp_aes_def *def)
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{
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struct ccp_crypto_skcipher_alg *ccp_alg;
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struct skcipher_alg *alg;
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int ret;
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ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
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if (!ccp_alg)
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return -ENOMEM;
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INIT_LIST_HEAD(&ccp_alg->entry);
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ccp_alg->mode = def->mode;
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/* Copy the defaults and override as necessary */
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alg = &ccp_alg->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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alg->ivsize = def->ivsize;
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ret = crypto_register_skcipher(alg);
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if (ret) {
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pr_err("%s skcipher algorithm registration error (%d)\n",
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alg->base.cra_name, ret);
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kfree(ccp_alg);
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return ret;
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}
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list_add(&ccp_alg->entry, head);
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return 0;
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}
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int ccp_register_aes_algs(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_algs); i++) {
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if (aes_algs[i].version > ccpversion)
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continue;
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ret = ccp_register_aes_alg(head, &aes_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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