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401 lines
9.9 KiB
401 lines
9.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AMD Cryptographic Coprocessor (CCP) AES CMAC crypto API support |
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* |
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* Copyright (C) 2013,2018 Advanced Micro Devices, Inc. |
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* |
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* Author: Tom Lendacky <[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/algapi.h> |
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#include <crypto/aes.h> |
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#include <crypto/hash.h> |
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#include <crypto/internal/hash.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_cmac_complete(struct crypto_async_request *async_req, |
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int ret) |
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{ |
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struct ahash_request *req = ahash_request_cast(async_req); |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); |
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unsigned int digest_size = crypto_ahash_digestsize(tfm); |
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if (ret) |
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goto e_free; |
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if (rctx->hash_rem) { |
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/* Save remaining data to buffer */ |
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unsigned int offset = rctx->nbytes - rctx->hash_rem; |
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scatterwalk_map_and_copy(rctx->buf, rctx->src, |
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offset, rctx->hash_rem, 0); |
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rctx->buf_count = rctx->hash_rem; |
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} else { |
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rctx->buf_count = 0; |
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} |
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/* Update result area if supplied */ |
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if (req->result && rctx->final) |
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memcpy(req->result, rctx->iv, digest_size); |
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e_free: |
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sg_free_table(&rctx->data_sg); |
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return ret; |
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} |
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static int ccp_do_cmac_update(struct ahash_request *req, unsigned int nbytes, |
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unsigned int final) |
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{ |
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
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struct ccp_ctx *ctx = crypto_ahash_ctx(tfm); |
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struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); |
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struct scatterlist *sg, *cmac_key_sg = NULL; |
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unsigned int block_size = |
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crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); |
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unsigned int need_pad, sg_count; |
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gfp_t gfp; |
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u64 len; |
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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 (nbytes) |
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rctx->null_msg = 0; |
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len = (u64)rctx->buf_count + (u64)nbytes; |
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if (!final && (len <= block_size)) { |
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scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src, |
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0, nbytes, 0); |
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rctx->buf_count += nbytes; |
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return 0; |
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} |
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rctx->src = req->src; |
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rctx->nbytes = nbytes; |
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rctx->final = final; |
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rctx->hash_rem = final ? 0 : len & (block_size - 1); |
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rctx->hash_cnt = len - rctx->hash_rem; |
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if (!final && !rctx->hash_rem) { |
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/* CCP can't do zero length final, so keep some data around */ |
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rctx->hash_cnt -= block_size; |
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rctx->hash_rem = block_size; |
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} |
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if (final && (rctx->null_msg || (len & (block_size - 1)))) |
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need_pad = 1; |
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else |
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need_pad = 0; |
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sg_init_one(&rctx->iv_sg, rctx->iv, sizeof(rctx->iv)); |
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/* Build the data scatterlist table - allocate enough entries for all |
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* possible data pieces (buffer, input data, padding) |
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*/ |
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sg_count = (nbytes) ? sg_nents(req->src) + 2 : 2; |
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gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? |
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GFP_KERNEL : GFP_ATOMIC; |
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ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp); |
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if (ret) |
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return ret; |
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sg = NULL; |
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if (rctx->buf_count) { |
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sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count); |
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sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg); |
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if (!sg) { |
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ret = -EINVAL; |
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goto e_free; |
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} |
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} |
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if (nbytes) { |
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sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src); |
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if (!sg) { |
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ret = -EINVAL; |
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goto e_free; |
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} |
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} |
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if (need_pad) { |
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int pad_length = block_size - (len & (block_size - 1)); |
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rctx->hash_cnt += pad_length; |
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memset(rctx->pad, 0, sizeof(rctx->pad)); |
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rctx->pad[0] = 0x80; |
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sg_init_one(&rctx->pad_sg, rctx->pad, pad_length); |
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sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->pad_sg); |
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if (!sg) { |
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ret = -EINVAL; |
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goto e_free; |
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} |
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} |
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if (sg) { |
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sg_mark_end(sg); |
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sg = rctx->data_sg.sgl; |
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} |
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/* Initialize the K1/K2 scatterlist */ |
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if (final) |
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cmac_key_sg = (need_pad) ? &ctx->u.aes.k2_sg |
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: &ctx->u.aes.k1_sg; |
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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 = CCP_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 = &rctx->iv_sg; |
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rctx->cmd.u.aes.iv_len = AES_BLOCK_SIZE; |
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rctx->cmd.u.aes.src = sg; |
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rctx->cmd.u.aes.src_len = rctx->hash_cnt; |
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rctx->cmd.u.aes.dst = NULL; |
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rctx->cmd.u.aes.cmac_key = cmac_key_sg; |
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rctx->cmd.u.aes.cmac_key_len = ctx->u.aes.kn_len; |
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rctx->cmd.u.aes.cmac_final = final; |
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ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); |
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return ret; |
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e_free: |
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sg_free_table(&rctx->data_sg); |
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return ret; |
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} |
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static int ccp_aes_cmac_init(struct ahash_request *req) |
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{ |
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struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); |
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memset(rctx, 0, sizeof(*rctx)); |
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rctx->null_msg = 1; |
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return 0; |
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} |
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static int ccp_aes_cmac_update(struct ahash_request *req) |
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{ |
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return ccp_do_cmac_update(req, req->nbytes, 0); |
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} |
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static int ccp_aes_cmac_final(struct ahash_request *req) |
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{ |
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return ccp_do_cmac_update(req, 0, 1); |
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} |
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static int ccp_aes_cmac_finup(struct ahash_request *req) |
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{ |
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return ccp_do_cmac_update(req, req->nbytes, 1); |
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} |
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static int ccp_aes_cmac_digest(struct ahash_request *req) |
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{ |
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int ret; |
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ret = ccp_aes_cmac_init(req); |
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if (ret) |
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return ret; |
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return ccp_aes_cmac_finup(req); |
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} |
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static int ccp_aes_cmac_export(struct ahash_request *req, void *out) |
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{ |
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struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); |
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struct ccp_aes_cmac_exp_ctx state; |
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/* Don't let anything leak to 'out' */ |
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memset(&state, 0, sizeof(state)); |
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state.null_msg = rctx->null_msg; |
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memcpy(state.iv, rctx->iv, sizeof(state.iv)); |
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state.buf_count = rctx->buf_count; |
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memcpy(state.buf, rctx->buf, sizeof(state.buf)); |
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/* 'out' may not be aligned so memcpy from local variable */ |
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memcpy(out, &state, sizeof(state)); |
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return 0; |
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} |
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static int ccp_aes_cmac_import(struct ahash_request *req, const void *in) |
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{ |
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struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); |
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struct ccp_aes_cmac_exp_ctx state; |
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/* 'in' may not be aligned so memcpy to local variable */ |
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memcpy(&state, in, sizeof(state)); |
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memset(rctx, 0, sizeof(*rctx)); |
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rctx->null_msg = state.null_msg; |
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memcpy(rctx->iv, state.iv, sizeof(rctx->iv)); |
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rctx->buf_count = state.buf_count; |
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memcpy(rctx->buf, state.buf, sizeof(rctx->buf)); |
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return 0; |
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} |
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static int ccp_aes_cmac_setkey(struct crypto_ahash *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_ahash_tfm(tfm)); |
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struct ccp_crypto_ahash_alg *alg = |
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ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm)); |
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u64 k0_hi, k0_lo, k1_hi, k1_lo, k2_hi, k2_lo; |
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u64 rb_hi = 0x00, rb_lo = 0x87; |
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struct crypto_aes_ctx aes; |
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__be64 *gk; |
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int ret; |
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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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/* Set to zero until complete */ |
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ctx->u.aes.key_len = 0; |
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/* Set the key for the AES cipher used to generate the keys */ |
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ret = aes_expandkey(&aes, key, key_len); |
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if (ret) |
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return ret; |
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/* Encrypt a block of zeroes - use key area in context */ |
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memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key)); |
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aes_encrypt(&aes, ctx->u.aes.key, ctx->u.aes.key); |
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memzero_explicit(&aes, sizeof(aes)); |
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/* Generate K1 and K2 */ |
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k0_hi = be64_to_cpu(*((__be64 *)ctx->u.aes.key)); |
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k0_lo = be64_to_cpu(*((__be64 *)ctx->u.aes.key + 1)); |
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k1_hi = (k0_hi << 1) | (k0_lo >> 63); |
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k1_lo = k0_lo << 1; |
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if (ctx->u.aes.key[0] & 0x80) { |
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k1_hi ^= rb_hi; |
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k1_lo ^= rb_lo; |
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} |
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gk = (__be64 *)ctx->u.aes.k1; |
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*gk = cpu_to_be64(k1_hi); |
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gk++; |
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*gk = cpu_to_be64(k1_lo); |
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k2_hi = (k1_hi << 1) | (k1_lo >> 63); |
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k2_lo = k1_lo << 1; |
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if (ctx->u.aes.k1[0] & 0x80) { |
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k2_hi ^= rb_hi; |
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k2_lo ^= rb_lo; |
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} |
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gk = (__be64 *)ctx->u.aes.k2; |
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*gk = cpu_to_be64(k2_hi); |
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gk++; |
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*gk = cpu_to_be64(k2_lo); |
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ctx->u.aes.kn_len = sizeof(ctx->u.aes.k1); |
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sg_init_one(&ctx->u.aes.k1_sg, ctx->u.aes.k1, sizeof(ctx->u.aes.k1)); |
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sg_init_one(&ctx->u.aes.k2_sg, ctx->u.aes.k2, sizeof(ctx->u.aes.k2)); |
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/* Save the supplied key */ |
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memset(ctx->u.aes.key, 0, sizeof(ctx->u.aes.key)); |
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memcpy(ctx->u.aes.key, key, key_len); |
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ctx->u.aes.key_len = 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 ret; |
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} |
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static int ccp_aes_cmac_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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struct crypto_ahash *ahash = __crypto_ahash_cast(tfm); |
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ctx->complete = ccp_aes_cmac_complete; |
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ctx->u.aes.key_len = 0; |
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crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_aes_cmac_req_ctx)); |
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return 0; |
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} |
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int ccp_register_aes_cmac_algs(struct list_head *head) |
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{ |
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struct ccp_crypto_ahash_alg *ccp_alg; |
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struct ahash_alg *alg; |
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struct hash_alg_common *halg; |
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struct crypto_alg *base; |
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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 = CCP_AES_MODE_CMAC; |
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alg = &ccp_alg->alg; |
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alg->init = ccp_aes_cmac_init; |
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alg->update = ccp_aes_cmac_update; |
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alg->final = ccp_aes_cmac_final; |
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alg->finup = ccp_aes_cmac_finup; |
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alg->digest = ccp_aes_cmac_digest; |
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alg->export = ccp_aes_cmac_export; |
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alg->import = ccp_aes_cmac_import; |
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alg->setkey = ccp_aes_cmac_setkey; |
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halg = &alg->halg; |
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halg->digestsize = AES_BLOCK_SIZE; |
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halg->statesize = sizeof(struct ccp_aes_cmac_exp_ctx); |
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base = &halg->base; |
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snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)"); |
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snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "cmac-aes-ccp"); |
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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_init = ccp_aes_cmac_cra_init; |
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base->cra_module = THIS_MODULE; |
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ret = crypto_register_ahash(alg); |
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if (ret) { |
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pr_err("%s ahash algorithm registration error (%d)\n", |
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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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