Wire up support for Triple DES in ECB mode. Signed-off-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>tirimbino
Gary R Hook
8 years ago
committed by
Herbert Xu
parent
ccebcf3f22
commit
990672d485
@ -0,0 +1,254 @@ |
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/*
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* AMD Cryptographic Coprocessor (CCP) DES3 crypto API support |
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* |
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* Copyright (C) 2016 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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