255 lines
6.3 KiB
C
255 lines
6.3 KiB
C
/*
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* AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
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*
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* Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
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*
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* Author: Gary R Hook <ghook@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/scatterwalk.h>
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#include <crypto/des.h>
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#include "ccp-crypto.h"
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static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
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{
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struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
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struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req);
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if (ret)
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return ret;
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if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
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memcpy(req->info, rctx->iv, DES3_EDE_BLOCK_SIZE);
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return 0;
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}
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static int ccp_des3_setkey(struct crypto_ablkcipher *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_tfm_ctx(crypto_ablkcipher_tfm(tfm));
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struct ccp_crypto_ablkcipher_alg *alg =
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ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
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u32 *flags = &tfm->base.crt_flags;
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/* From des_generic.c:
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*
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* RFC2451:
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* If the first two or last two independent 64-bit keys are
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* equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
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* same as DES. Implementers MUST reject keys that exhibit this
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* property.
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*/
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const u32 *K = (const u32 *)key;
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if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
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!((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
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(*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
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*flags |= CRYPTO_TFM_RES_WEAK_KEY;
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return -EINVAL;
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}
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/* It's not clear that there is any support for a keysize of 112.
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* If needed, the caller should make K1 == K3
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*/
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ctx->u.des3.type = CCP_DES3_TYPE_168;
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ctx->u.des3.mode = alg->mode;
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ctx->u.des3.key_len = key_len;
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memcpy(ctx->u.des3.key, key, key_len);
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sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
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return 0;
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}
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static int ccp_des3_crypt(struct ablkcipher_request *req, bool encrypt)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct ccp_des3_req_ctx *rctx = ablkcipher_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.des3.key_len)
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return -EINVAL;
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if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
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(ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
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(req->nbytes & (DES3_EDE_BLOCK_SIZE - 1)))
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return -EINVAL;
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if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
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if (!req->info)
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return -EINVAL;
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memcpy(rctx->iv, req->info, DES3_EDE_BLOCK_SIZE);
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iv_sg = &rctx->iv_sg;
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iv_len = DES3_EDE_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_DES3;
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rctx->cmd.u.des3.type = ctx->u.des3.type;
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rctx->cmd.u.des3.mode = ctx->u.des3.mode;
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rctx->cmd.u.des3.action = (encrypt)
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? CCP_DES3_ACTION_ENCRYPT
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: CCP_DES3_ACTION_DECRYPT;
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rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
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rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
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rctx->cmd.u.des3.iv = iv_sg;
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rctx->cmd.u.des3.iv_len = iv_len;
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rctx->cmd.u.des3.src = req->src;
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rctx->cmd.u.des3.src_len = req->nbytes;
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rctx->cmd.u.des3.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_des3_encrypt(struct ablkcipher_request *req)
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{
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return ccp_des3_crypt(req, true);
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}
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static int ccp_des3_decrypt(struct ablkcipher_request *req)
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{
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return ccp_des3_crypt(req, false);
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}
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static int ccp_des3_cra_init(struct crypto_tfm *tfm)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->complete = ccp_des3_complete;
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ctx->u.des3.key_len = 0;
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tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_des3_req_ctx);
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return 0;
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}
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static void ccp_des3_cra_exit(struct crypto_tfm *tfm)
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{
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}
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static struct crypto_alg ccp_des3_defaults = {
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.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
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CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_KERN_DRIVER_ONLY |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = DES3_EDE_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_type = &crypto_ablkcipher_type,
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.cra_init = ccp_des3_cra_init,
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.cra_exit = ccp_des3_cra_exit,
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.cra_module = THIS_MODULE,
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.cra_ablkcipher = {
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.setkey = ccp_des3_setkey,
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.encrypt = ccp_des3_encrypt,
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.decrypt = ccp_des3_decrypt,
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.min_keysize = DES3_EDE_KEY_SIZE,
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.max_keysize = DES3_EDE_KEY_SIZE,
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},
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};
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struct ccp_des3_def {
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enum ccp_des3_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 crypto_alg *alg_defaults;
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};
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static struct ccp_des3_def des3_algs[] = {
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{
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.mode = CCP_DES3_MODE_ECB,
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.version = CCP_VERSION(5, 0),
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.name = "ecb(des3_ede)",
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.driver_name = "ecb-des3-ccp",
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.blocksize = DES3_EDE_BLOCK_SIZE,
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.ivsize = 0,
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.alg_defaults = &ccp_des3_defaults,
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},
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{
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.mode = CCP_DES3_MODE_CBC,
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.version = CCP_VERSION(5, 0),
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.name = "cbc(des3_ede)",
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.driver_name = "cbc-des3-ccp",
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.blocksize = DES3_EDE_BLOCK_SIZE,
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.ivsize = DES3_EDE_BLOCK_SIZE,
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.alg_defaults = &ccp_des3_defaults,
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},
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};
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static int ccp_register_des3_alg(struct list_head *head,
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const struct ccp_des3_def *def)
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{
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struct ccp_crypto_ablkcipher_alg *ccp_alg;
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struct crypto_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->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
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snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
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def->driver_name);
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alg->cra_blocksize = def->blocksize;
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alg->cra_ablkcipher.ivsize = def->ivsize;
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ret = crypto_register_alg(alg);
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if (ret) {
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pr_err("%s ablkcipher algorithm registration error (%d)\n",
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alg->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_des3_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(des3_algs); i++) {
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if (des3_algs[i].version > ccpversion)
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continue;
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ret = ccp_register_des3_alg(head, &des3_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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