136cf515bSGary R Hook /* 236cf515bSGary R Hook * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support 336cf515bSGary R Hook * 468cc652fSGary R Hook * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. 536cf515bSGary R Hook * 636cf515bSGary R Hook * Author: Gary R Hook <gary.hook@amd.com> 736cf515bSGary R Hook * 836cf515bSGary R Hook * This program is free software; you can redistribute it and/or modify 936cf515bSGary R Hook * it under the terms of the GNU General Public License version 2 as 1036cf515bSGary R Hook * published by the Free Software Foundation. 1136cf515bSGary R Hook */ 1236cf515bSGary R Hook 1336cf515bSGary R Hook #include <linux/module.h> 1436cf515bSGary R Hook #include <linux/sched.h> 1536cf515bSGary R Hook #include <linux/delay.h> 1636cf515bSGary R Hook #include <linux/scatterlist.h> 1736cf515bSGary R Hook #include <linux/crypto.h> 1836cf515bSGary R Hook #include <crypto/internal/aead.h> 1936cf515bSGary R Hook #include <crypto/algapi.h> 2036cf515bSGary R Hook #include <crypto/aes.h> 2136cf515bSGary R Hook #include <crypto/ctr.h> 2236cf515bSGary R Hook #include <crypto/scatterwalk.h> 2336cf515bSGary R Hook #include <linux/delay.h> 2436cf515bSGary R Hook 2536cf515bSGary R Hook #include "ccp-crypto.h" 2636cf515bSGary R Hook 2736cf515bSGary R Hook #define AES_GCM_IVSIZE 12 2836cf515bSGary R Hook 2936cf515bSGary R Hook static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret) 3036cf515bSGary R Hook { 3136cf515bSGary R Hook return ret; 3236cf515bSGary R Hook } 3336cf515bSGary R Hook 3436cf515bSGary R Hook static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key, 3536cf515bSGary R Hook unsigned int key_len) 3636cf515bSGary R Hook { 3736cf515bSGary R Hook struct ccp_ctx *ctx = crypto_aead_ctx(tfm); 3836cf515bSGary R Hook 3936cf515bSGary R Hook switch (key_len) { 4036cf515bSGary R Hook case AES_KEYSIZE_128: 4136cf515bSGary R Hook ctx->u.aes.type = CCP_AES_TYPE_128; 4236cf515bSGary R Hook break; 4336cf515bSGary R Hook case AES_KEYSIZE_192: 4436cf515bSGary R Hook ctx->u.aes.type = CCP_AES_TYPE_192; 4536cf515bSGary R Hook break; 4636cf515bSGary R Hook case AES_KEYSIZE_256: 4736cf515bSGary R Hook ctx->u.aes.type = CCP_AES_TYPE_256; 4836cf515bSGary R Hook break; 4936cf515bSGary R Hook default: 5036cf515bSGary R Hook crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); 5136cf515bSGary R Hook return -EINVAL; 5236cf515bSGary R Hook } 5336cf515bSGary R Hook 5436cf515bSGary R Hook ctx->u.aes.mode = CCP_AES_MODE_GCM; 5536cf515bSGary R Hook ctx->u.aes.key_len = key_len; 5636cf515bSGary R Hook 5736cf515bSGary R Hook memcpy(ctx->u.aes.key, key, key_len); 5836cf515bSGary R Hook sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); 5936cf515bSGary R Hook 6036cf515bSGary R Hook return 0; 6136cf515bSGary R Hook } 6236cf515bSGary R Hook 6336cf515bSGary R Hook static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm, 6436cf515bSGary R Hook unsigned int authsize) 6536cf515bSGary R Hook { 6636cf515bSGary R Hook return 0; 6736cf515bSGary R Hook } 6836cf515bSGary R Hook 6936cf515bSGary R Hook static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt) 7036cf515bSGary R Hook { 7136cf515bSGary R Hook struct crypto_aead *tfm = crypto_aead_reqtfm(req); 7236cf515bSGary R Hook struct ccp_ctx *ctx = crypto_aead_ctx(tfm); 7336cf515bSGary R Hook struct ccp_aes_req_ctx *rctx = aead_request_ctx(req); 7436cf515bSGary R Hook struct scatterlist *iv_sg = NULL; 7536cf515bSGary R Hook unsigned int iv_len = 0; 7636cf515bSGary R Hook int i; 7736cf515bSGary R Hook int ret = 0; 7836cf515bSGary R Hook 7936cf515bSGary R Hook if (!ctx->u.aes.key_len) 8036cf515bSGary R Hook return -EINVAL; 8136cf515bSGary R Hook 8236cf515bSGary R Hook if (ctx->u.aes.mode != CCP_AES_MODE_GCM) 8336cf515bSGary R Hook return -EINVAL; 8436cf515bSGary R Hook 8536cf515bSGary R Hook if (!req->iv) 8636cf515bSGary R Hook return -EINVAL; 8736cf515bSGary R Hook 8836cf515bSGary R Hook /* 8936cf515bSGary R Hook * 5 parts: 9036cf515bSGary R Hook * plaintext/ciphertext input 9136cf515bSGary R Hook * AAD 9236cf515bSGary R Hook * key 9336cf515bSGary R Hook * IV 9436cf515bSGary R Hook * Destination+tag buffer 9536cf515bSGary R Hook */ 9636cf515bSGary R Hook 9736cf515bSGary R Hook /* Prepare the IV: 12 bytes + an integer (counter) */ 9836cf515bSGary R Hook memcpy(rctx->iv, req->iv, AES_GCM_IVSIZE); 9936cf515bSGary R Hook for (i = 0; i < 3; i++) 10036cf515bSGary R Hook rctx->iv[i + AES_GCM_IVSIZE] = 0; 10136cf515bSGary R Hook rctx->iv[AES_BLOCK_SIZE - 1] = 1; 10236cf515bSGary R Hook 10336cf515bSGary R Hook /* Set up a scatterlist for the IV */ 10436cf515bSGary R Hook iv_sg = &rctx->iv_sg; 10536cf515bSGary R Hook iv_len = AES_BLOCK_SIZE; 10636cf515bSGary R Hook sg_init_one(iv_sg, rctx->iv, iv_len); 10736cf515bSGary R Hook 10836cf515bSGary R Hook /* The AAD + plaintext are concatenated in the src buffer */ 10936cf515bSGary R Hook memset(&rctx->cmd, 0, sizeof(rctx->cmd)); 11036cf515bSGary R Hook INIT_LIST_HEAD(&rctx->cmd.entry); 11136cf515bSGary R Hook rctx->cmd.engine = CCP_ENGINE_AES; 11236cf515bSGary R Hook rctx->cmd.u.aes.type = ctx->u.aes.type; 11336cf515bSGary R Hook rctx->cmd.u.aes.mode = ctx->u.aes.mode; 11436cf515bSGary R Hook rctx->cmd.u.aes.action = encrypt; 11536cf515bSGary R Hook rctx->cmd.u.aes.key = &ctx->u.aes.key_sg; 11636cf515bSGary R Hook rctx->cmd.u.aes.key_len = ctx->u.aes.key_len; 11736cf515bSGary R Hook rctx->cmd.u.aes.iv = iv_sg; 11836cf515bSGary R Hook rctx->cmd.u.aes.iv_len = iv_len; 11936cf515bSGary R Hook rctx->cmd.u.aes.src = req->src; 12036cf515bSGary R Hook rctx->cmd.u.aes.src_len = req->cryptlen; 12136cf515bSGary R Hook rctx->cmd.u.aes.aad_len = req->assoclen; 12236cf515bSGary R Hook 12336cf515bSGary R Hook /* The cipher text + the tag are in the dst buffer */ 12436cf515bSGary R Hook rctx->cmd.u.aes.dst = req->dst; 12536cf515bSGary R Hook 12636cf515bSGary R Hook ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); 12736cf515bSGary R Hook 12836cf515bSGary R Hook return ret; 12936cf515bSGary R Hook } 13036cf515bSGary R Hook 13136cf515bSGary R Hook static int ccp_aes_gcm_encrypt(struct aead_request *req) 13236cf515bSGary R Hook { 13336cf515bSGary R Hook return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT); 13436cf515bSGary R Hook } 13536cf515bSGary R Hook 13636cf515bSGary R Hook static int ccp_aes_gcm_decrypt(struct aead_request *req) 13736cf515bSGary R Hook { 13836cf515bSGary R Hook return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT); 13936cf515bSGary R Hook } 14036cf515bSGary R Hook 14136cf515bSGary R Hook static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm) 14236cf515bSGary R Hook { 14336cf515bSGary R Hook struct ccp_ctx *ctx = crypto_aead_ctx(tfm); 14436cf515bSGary R Hook 14536cf515bSGary R Hook ctx->complete = ccp_aes_gcm_complete; 14636cf515bSGary R Hook ctx->u.aes.key_len = 0; 14736cf515bSGary R Hook 14836cf515bSGary R Hook crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx)); 14936cf515bSGary R Hook 15036cf515bSGary R Hook return 0; 15136cf515bSGary R Hook } 15236cf515bSGary R Hook 15336cf515bSGary R Hook static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm) 15436cf515bSGary R Hook { 15536cf515bSGary R Hook } 15636cf515bSGary R Hook 15736cf515bSGary R Hook static struct aead_alg ccp_aes_gcm_defaults = { 15836cf515bSGary R Hook .setkey = ccp_aes_gcm_setkey, 15936cf515bSGary R Hook .setauthsize = ccp_aes_gcm_setauthsize, 16036cf515bSGary R Hook .encrypt = ccp_aes_gcm_encrypt, 16136cf515bSGary R Hook .decrypt = ccp_aes_gcm_decrypt, 16236cf515bSGary R Hook .init = ccp_aes_gcm_cra_init, 16336cf515bSGary R Hook .ivsize = AES_GCM_IVSIZE, 16436cf515bSGary R Hook .maxauthsize = AES_BLOCK_SIZE, 16536cf515bSGary R Hook .base = { 16636cf515bSGary R Hook .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 16736cf515bSGary R Hook CRYPTO_ALG_ASYNC | 16836cf515bSGary R Hook CRYPTO_ALG_KERN_DRIVER_ONLY | 16936cf515bSGary R Hook CRYPTO_ALG_NEED_FALLBACK, 17036cf515bSGary R Hook .cra_blocksize = AES_BLOCK_SIZE, 17136cf515bSGary R Hook .cra_ctxsize = sizeof(struct ccp_ctx), 17236cf515bSGary R Hook .cra_priority = CCP_CRA_PRIORITY, 17336cf515bSGary R Hook .cra_type = &crypto_ablkcipher_type, 17436cf515bSGary R Hook .cra_exit = ccp_aes_gcm_cra_exit, 17536cf515bSGary R Hook .cra_module = THIS_MODULE, 17636cf515bSGary R Hook }, 17736cf515bSGary R Hook }; 17836cf515bSGary R Hook 17936cf515bSGary R Hook struct ccp_aes_aead_def { 18036cf515bSGary R Hook enum ccp_aes_mode mode; 18136cf515bSGary R Hook unsigned int version; 18236cf515bSGary R Hook const char *name; 18336cf515bSGary R Hook const char *driver_name; 18436cf515bSGary R Hook unsigned int blocksize; 18536cf515bSGary R Hook unsigned int ivsize; 18636cf515bSGary R Hook struct aead_alg *alg_defaults; 18736cf515bSGary R Hook }; 18836cf515bSGary R Hook 18936cf515bSGary R Hook static struct ccp_aes_aead_def aes_aead_algs[] = { 19036cf515bSGary R Hook { 19136cf515bSGary R Hook .mode = CCP_AES_MODE_GHASH, 19236cf515bSGary R Hook .version = CCP_VERSION(5, 0), 19336cf515bSGary R Hook .name = "gcm(aes)", 19436cf515bSGary R Hook .driver_name = "gcm-aes-ccp", 19536cf515bSGary R Hook .blocksize = 1, 19636cf515bSGary R Hook .ivsize = AES_BLOCK_SIZE, 19736cf515bSGary R Hook .alg_defaults = &ccp_aes_gcm_defaults, 19836cf515bSGary R Hook }, 19936cf515bSGary R Hook }; 20036cf515bSGary R Hook 20136cf515bSGary R Hook static int ccp_register_aes_aead(struct list_head *head, 20236cf515bSGary R Hook const struct ccp_aes_aead_def *def) 20336cf515bSGary R Hook { 20436cf515bSGary R Hook struct ccp_crypto_aead *ccp_aead; 20536cf515bSGary R Hook struct aead_alg *alg; 20636cf515bSGary R Hook int ret; 20736cf515bSGary R Hook 20836cf515bSGary R Hook ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL); 20936cf515bSGary R Hook if (!ccp_aead) 21036cf515bSGary R Hook return -ENOMEM; 21136cf515bSGary R Hook 21236cf515bSGary R Hook INIT_LIST_HEAD(&ccp_aead->entry); 21336cf515bSGary R Hook 21436cf515bSGary R Hook ccp_aead->mode = def->mode; 21536cf515bSGary R Hook 21636cf515bSGary R Hook /* Copy the defaults and override as necessary */ 21736cf515bSGary R Hook alg = &ccp_aead->alg; 21836cf515bSGary R Hook *alg = *def->alg_defaults; 21936cf515bSGary R Hook snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 22036cf515bSGary R Hook snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 22136cf515bSGary R Hook def->driver_name); 22236cf515bSGary R Hook alg->base.cra_blocksize = def->blocksize; 22336cf515bSGary R Hook alg->base.cra_ablkcipher.ivsize = def->ivsize; 22436cf515bSGary R Hook 22536cf515bSGary R Hook ret = crypto_register_aead(alg); 22636cf515bSGary R Hook if (ret) { 22736cf515bSGary R Hook pr_err("%s ablkcipher algorithm registration error (%d)\n", 22836cf515bSGary R Hook alg->base.cra_name, ret); 22936cf515bSGary R Hook kfree(ccp_aead); 23036cf515bSGary R Hook return ret; 23136cf515bSGary R Hook } 23236cf515bSGary R Hook 23336cf515bSGary R Hook list_add(&ccp_aead->entry, head); 23436cf515bSGary R Hook 23536cf515bSGary R Hook return 0; 23636cf515bSGary R Hook } 23736cf515bSGary R Hook 23836cf515bSGary R Hook int ccp_register_aes_aeads(struct list_head *head) 23936cf515bSGary R Hook { 24036cf515bSGary R Hook int i, ret; 24136cf515bSGary R Hook unsigned int ccpversion = ccp_version(); 24236cf515bSGary R Hook 24336cf515bSGary R Hook for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) { 24436cf515bSGary R Hook if (aes_aead_algs[i].version > ccpversion) 24536cf515bSGary R Hook continue; 24636cf515bSGary R Hook ret = ccp_register_aes_aead(head, &aes_aead_algs[i]); 24736cf515bSGary R Hook if (ret) 24836cf515bSGary R Hook return ret; 24936cf515bSGary R Hook } 25036cf515bSGary R Hook 25136cf515bSGary R Hook return 0; 25236cf515bSGary R Hook } 253