518 lines
12 KiB
C
518 lines
12 KiB
C
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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) 2013,2016 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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* Author: Gary R Hook <gary.hook@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/scatterlist.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/hash.h>
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#include <crypto/internal/hash.h>
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#include <crypto/sha.h>
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#include <crypto/scatterwalk.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)
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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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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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SHASH_DESC_ON_STACK(sdesc, shash);
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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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sdesc->tfm = shash;
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sdesc->flags = crypto_ahash_get_flags(tfm) &
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CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = crypto_shash_digest(sdesc, key, key_len,
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ctx->u.sha.key);
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if (ret) {
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crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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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] ^ 0x36;
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ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
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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;
|
||
|
|
const char *drv_name;
|
||
|
|
enum ccp_sha_type type;
|
||
|
|
u32 digest_size;
|
||
|
|
u32 block_size;
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct ccp_sha_def sha_algs[] = {
|
||
|
|
{
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "sha1",
|
||
|
|
.drv_name = "sha1-ccp",
|
||
|
|
.type = CCP_SHA_TYPE_1,
|
||
|
|
.digest_size = SHA1_DIGEST_SIZE,
|
||
|
|
.block_size = SHA1_BLOCK_SIZE,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "sha224",
|
||
|
|
.drv_name = "sha224-ccp",
|
||
|
|
.type = CCP_SHA_TYPE_224,
|
||
|
|
.digest_size = SHA224_DIGEST_SIZE,
|
||
|
|
.block_size = SHA224_BLOCK_SIZE,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "sha256",
|
||
|
|
.drv_name = "sha256-ccp",
|
||
|
|
.type = CCP_SHA_TYPE_256,
|
||
|
|
.digest_size = SHA256_DIGEST_SIZE,
|
||
|
|
.block_size = SHA256_BLOCK_SIZE,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int ccp_register_hmac_alg(struct list_head *head,
|
||
|
|
const struct ccp_sha_def *def,
|
||
|
|
const struct ccp_crypto_ahash_alg *base_alg)
|
||
|
|
{
|
||
|
|
struct ccp_crypto_ahash_alg *ccp_alg;
|
||
|
|
struct ahash_alg *alg;
|
||
|
|
struct hash_alg_common *halg;
|
||
|
|
struct crypto_alg *base;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
|
||
|
|
if (!ccp_alg)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
/* Copy the base algorithm and only change what's necessary */
|
||
|
|
*ccp_alg = *base_alg;
|
||
|
|
INIT_LIST_HEAD(&ccp_alg->entry);
|
||
|
|
|
||
|
|
strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
|
||
|
|
|
||
|
|
alg = &ccp_alg->alg;
|
||
|
|
alg->setkey = ccp_sha_setkey;
|
||
|
|
|
||
|
|
halg = &alg->halg;
|
||
|
|
|
||
|
|
base = &halg->base;
|
||
|
|
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
|
||
|
|
snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
|
||
|
|
def->drv_name);
|
||
|
|
base->cra_init = ccp_hmac_sha_cra_init;
|
||
|
|
base->cra_exit = ccp_hmac_sha_cra_exit;
|
||
|
|
|
||
|
|
ret = crypto_register_ahash(alg);
|
||
|
|
if (ret) {
|
||
|
|
pr_err("%s ahash algorithm registration error (%d)\n",
|
||
|
|
base->cra_name, ret);
|
||
|
|
kfree(ccp_alg);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add(&ccp_alg->entry, head);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_register_sha_alg(struct list_head *head,
|
||
|
|
const struct ccp_sha_def *def)
|
||
|
|
{
|
||
|
|
struct ccp_crypto_ahash_alg *ccp_alg;
|
||
|
|
struct ahash_alg *alg;
|
||
|
|
struct hash_alg_common *halg;
|
||
|
|
struct crypto_alg *base;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
|
||
|
|
if (!ccp_alg)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
INIT_LIST_HEAD(&ccp_alg->entry);
|
||
|
|
|
||
|
|
ccp_alg->type = def->type;
|
||
|
|
|
||
|
|
alg = &ccp_alg->alg;
|
||
|
|
alg->init = ccp_sha_init;
|
||
|
|
alg->update = ccp_sha_update;
|
||
|
|
alg->final = ccp_sha_final;
|
||
|
|
alg->finup = ccp_sha_finup;
|
||
|
|
alg->digest = ccp_sha_digest;
|
||
|
|
alg->export = ccp_sha_export;
|
||
|
|
alg->import = ccp_sha_import;
|
||
|
|
|
||
|
|
halg = &alg->halg;
|
||
|
|
halg->digestsize = def->digest_size;
|
||
|
|
halg->statesize = sizeof(struct ccp_sha_exp_ctx);
|
||
|
|
|
||
|
|
base = &halg->base;
|
||
|
|
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
|
||
|
|
snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
|
||
|
|
def->drv_name);
|
||
|
|
base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
||
|
|
CRYPTO_ALG_NEED_FALLBACK;
|
||
|
|
base->cra_blocksize = def->block_size;
|
||
|
|
base->cra_ctxsize = sizeof(struct ccp_ctx);
|
||
|
|
base->cra_priority = CCP_CRA_PRIORITY;
|
||
|
|
base->cra_type = &crypto_ahash_type;
|
||
|
|
base->cra_init = ccp_sha_cra_init;
|
||
|
|
base->cra_exit = ccp_sha_cra_exit;
|
||
|
|
base->cra_module = THIS_MODULE;
|
||
|
|
|
||
|
|
ret = crypto_register_ahash(alg);
|
||
|
|
if (ret) {
|
||
|
|
pr_err("%s ahash algorithm registration error (%d)\n",
|
||
|
|
base->cra_name, ret);
|
||
|
|
kfree(ccp_alg);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add(&ccp_alg->entry, head);
|
||
|
|
|
||
|
|
ret = ccp_register_hmac_alg(head, def, ccp_alg);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ccp_register_sha_algs(struct list_head *head)
|
||
|
|
{
|
||
|
|
int i, ret;
|
||
|
|
unsigned int ccpversion = ccp_version();
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
|
||
|
|
if (sha_algs[i].version > ccpversion)
|
||
|
|
continue;
|
||
|
|
ret = ccp_register_sha_alg(head, &sha_algs[i]);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|