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530 lines
13 KiB
530 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AMD Cryptographic Coprocessor (CCP) SHA 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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* 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/algapi.h> |
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#include <crypto/hash.h> |
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#include <crypto/hmac.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/sha1.h> |
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#include <crypto/sha2.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/string.h> |
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#include "ccp-crypto.h" |
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static int ccp_sha_complete(struct crypto_async_request *async_req, 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_sha_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->ctx, 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_sha_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_sha_req_ctx *rctx = ahash_request_ctx(req); |
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struct scatterlist *sg; |
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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 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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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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/* Initialize the context scatterlist */ |
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sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx)); |
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sg = NULL; |
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if (rctx->buf_count && nbytes) { |
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/* Build the data scatterlist table - allocate enough entries |
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* for both data pieces (buffer and input data) |
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*/ |
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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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sg_count = sg_nents(req->src) + 1; |
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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_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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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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sg_mark_end(sg); |
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sg = rctx->data_sg.sgl; |
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} else if (rctx->buf_count) { |
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sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count); |
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sg = &rctx->buf_sg; |
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} else if (nbytes) { |
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sg = req->src; |
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} |
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rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */ |
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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_SHA; |
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rctx->cmd.u.sha.type = rctx->type; |
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rctx->cmd.u.sha.ctx = &rctx->ctx_sg; |
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switch (rctx->type) { |
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case CCP_SHA_TYPE_1: |
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rctx->cmd.u.sha.ctx_len = SHA1_DIGEST_SIZE; |
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break; |
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case CCP_SHA_TYPE_224: |
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rctx->cmd.u.sha.ctx_len = SHA224_DIGEST_SIZE; |
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break; |
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case CCP_SHA_TYPE_256: |
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rctx->cmd.u.sha.ctx_len = SHA256_DIGEST_SIZE; |
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break; |
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case CCP_SHA_TYPE_384: |
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rctx->cmd.u.sha.ctx_len = SHA384_DIGEST_SIZE; |
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break; |
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case CCP_SHA_TYPE_512: |
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rctx->cmd.u.sha.ctx_len = SHA512_DIGEST_SIZE; |
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break; |
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default: |
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/* Should never get here */ |
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break; |
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} |
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rctx->cmd.u.sha.src = sg; |
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rctx->cmd.u.sha.src_len = rctx->hash_cnt; |
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rctx->cmd.u.sha.opad = ctx->u.sha.key_len ? |
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&ctx->u.sha.opad_sg : NULL; |
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rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ? |
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ctx->u.sha.opad_count : 0; |
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rctx->cmd.u.sha.first = rctx->first; |
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rctx->cmd.u.sha.final = rctx->final; |
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rctx->cmd.u.sha.msg_bits = rctx->msg_bits; |
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rctx->first = 0; |
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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_sha_init(struct ahash_request *req) |
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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_sha_req_ctx *rctx = ahash_request_ctx(req); |
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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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unsigned int block_size = |
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crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); |
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memset(rctx, 0, sizeof(*rctx)); |
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rctx->type = alg->type; |
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rctx->first = 1; |
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if (ctx->u.sha.key_len) { |
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/* Buffer the HMAC key for first update */ |
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memcpy(rctx->buf, ctx->u.sha.ipad, block_size); |
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rctx->buf_count = block_size; |
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} |
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return 0; |
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} |
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static int ccp_sha_update(struct ahash_request *req) |
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{ |
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return ccp_do_sha_update(req, req->nbytes, 0); |
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} |
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static int ccp_sha_final(struct ahash_request *req) |
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{ |
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return ccp_do_sha_update(req, 0, 1); |
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} |
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static int ccp_sha_finup(struct ahash_request *req) |
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{ |
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return ccp_do_sha_update(req, req->nbytes, 1); |
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} |
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static int ccp_sha_digest(struct ahash_request *req) |
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{ |
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int ret; |
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ret = ccp_sha_init(req); |
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if (ret) |
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return ret; |
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return ccp_sha_finup(req); |
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} |
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static int ccp_sha_export(struct ahash_request *req, void *out) |
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{ |
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struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req); |
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struct ccp_sha_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.type = rctx->type; |
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state.msg_bits = rctx->msg_bits; |
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state.first = rctx->first; |
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memcpy(state.ctx, rctx->ctx, sizeof(state.ctx)); |
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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_sha_import(struct ahash_request *req, const void *in) |
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{ |
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struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req); |
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struct ccp_sha_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->type = state.type; |
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rctx->msg_bits = state.msg_bits; |
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rctx->first = state.first; |
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memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx)); |
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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_sha_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 crypto_shash *shash = ctx->u.sha.hmac_tfm; |
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unsigned int block_size = crypto_shash_blocksize(shash); |
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unsigned int digest_size = crypto_shash_digestsize(shash); |
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int i, ret; |
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/* Set to zero until complete */ |
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ctx->u.sha.key_len = 0; |
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/* Clear key area to provide zero padding for keys smaller |
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* than the block size |
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*/ |
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memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key)); |
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if (key_len > block_size) { |
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/* Must hash the input key */ |
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ret = crypto_shash_tfm_digest(shash, key, key_len, |
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ctx->u.sha.key); |
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if (ret) |
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return -EINVAL; |
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key_len = digest_size; |
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} else { |
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memcpy(ctx->u.sha.key, key, key_len); |
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} |
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for (i = 0; i < block_size; i++) { |
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ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ HMAC_IPAD_VALUE; |
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ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ HMAC_OPAD_VALUE; |
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} |
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sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size); |
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ctx->u.sha.opad_count = block_size; |
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ctx->u.sha.key_len = key_len; |
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return 0; |
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} |
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static int ccp_sha_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_sha_complete; |
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ctx->u.sha.key_len = 0; |
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crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx)); |
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return 0; |
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} |
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static void ccp_sha_cra_exit(struct crypto_tfm *tfm) |
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{ |
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} |
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static int ccp_hmac_sha_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 ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm); |
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struct crypto_shash *hmac_tfm; |
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hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0); |
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if (IS_ERR(hmac_tfm)) { |
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pr_warn("could not load driver %s need for HMAC support\n", |
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alg->child_alg); |
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return PTR_ERR(hmac_tfm); |
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} |
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ctx->u.sha.hmac_tfm = hmac_tfm; |
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return ccp_sha_cra_init(tfm); |
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} |
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static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm) |
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{ |
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struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); |
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if (ctx->u.sha.hmac_tfm) |
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crypto_free_shash(ctx->u.sha.hmac_tfm); |
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ccp_sha_cra_exit(tfm); |
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} |
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struct ccp_sha_def { |
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unsigned int version; |
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const char *name; |
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const char *drv_name; |
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enum ccp_sha_type type; |
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u32 digest_size; |
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u32 block_size; |
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}; |
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static struct ccp_sha_def sha_algs[] = { |
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{ |
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.version = CCP_VERSION(3, 0), |
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.name = "sha1", |
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.drv_name = "sha1-ccp", |
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.type = CCP_SHA_TYPE_1, |
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.digest_size = SHA1_DIGEST_SIZE, |
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.block_size = SHA1_BLOCK_SIZE, |
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}, |
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{ |
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.version = CCP_VERSION(3, 0), |
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.name = "sha224", |
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.drv_name = "sha224-ccp", |
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.type = CCP_SHA_TYPE_224, |
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.digest_size = SHA224_DIGEST_SIZE, |
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.block_size = SHA224_BLOCK_SIZE, |
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}, |
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{ |
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.version = CCP_VERSION(3, 0), |
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.name = "sha256", |
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.drv_name = "sha256-ccp", |
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.type = CCP_SHA_TYPE_256, |
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.digest_size = SHA256_DIGEST_SIZE, |
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.block_size = SHA256_BLOCK_SIZE, |
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}, |
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{ |
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.version = CCP_VERSION(5, 0), |
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.name = "sha384", |
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.drv_name = "sha384-ccp", |
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.type = CCP_SHA_TYPE_384, |
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.digest_size = SHA384_DIGEST_SIZE, |
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.block_size = SHA384_BLOCK_SIZE, |
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}, |
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{ |
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.version = CCP_VERSION(5, 0), |
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.name = "sha512", |
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.drv_name = "sha512-ccp", |
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.type = CCP_SHA_TYPE_512, |
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.digest_size = SHA512_DIGEST_SIZE, |
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.block_size = SHA512_BLOCK_SIZE, |
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}, |
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}; |
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static int ccp_register_hmac_alg(struct list_head *head, |
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const struct ccp_sha_def *def, |
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const struct ccp_crypto_ahash_alg *base_alg) |
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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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/* Copy the base algorithm and only change what's necessary */ |
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*ccp_alg = *base_alg; |
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INIT_LIST_HEAD(&ccp_alg->entry); |
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strscpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME); |
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alg = &ccp_alg->alg; |
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alg->setkey = ccp_sha_setkey; |
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halg = &alg->halg; |
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base = &halg->base; |
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snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name); |
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snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s", |
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def->drv_name); |
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base->cra_init = ccp_hmac_sha_cra_init; |
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base->cra_exit = ccp_hmac_sha_cra_exit; |
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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 ret; |
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} |
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static int ccp_register_sha_alg(struct list_head *head, |
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const struct ccp_sha_def *def) |
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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->type = def->type; |
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alg = &ccp_alg->alg; |
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alg->init = ccp_sha_init; |
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alg->update = ccp_sha_update; |
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alg->final = ccp_sha_final; |
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alg->finup = ccp_sha_finup; |
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alg->digest = ccp_sha_digest; |
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alg->export = ccp_sha_export; |
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alg->import = ccp_sha_import; |
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halg = &alg->halg; |
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halg->digestsize = def->digest_size; |
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halg->statesize = sizeof(struct ccp_sha_exp_ctx); |
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base = &halg->base; |
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snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); |
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snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", |
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def->drv_name); |
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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 = def->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_sha_cra_init; |
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base->cra_exit = ccp_sha_cra_exit; |
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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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ret = ccp_register_hmac_alg(head, def, ccp_alg); |
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return ret; |
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} |
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int ccp_register_sha_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(sha_algs); i++) { |
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if (sha_algs[i].version > ccpversion) |
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continue; |
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ret = ccp_register_sha_alg(head, &sha_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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