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258 lines
5.8 KiB
258 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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* Copyright (C) 2016,2017 Advanced Micro Devices, Inc. |
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* |
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* Author: Gary R Hook <[email protected]> |
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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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#include <crypto/gcm.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_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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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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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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memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE); |
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for (i = 0; i < 3; i++) |
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rctx->iv[i + GCM_AES_IV_SIZE] = 0; |
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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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rctx->cmd.u.aes.authsize = crypto_aead_authsize(tfm); |
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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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.ivsize = GCM_AES_IV_SIZE, |
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.maxauthsize = AES_BLOCK_SIZE, |
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.base = { |
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.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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.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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pr_err("%s aead algorithm registration error (%d)\n", |
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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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