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![Andrzej Zaborowski](/assets/img/avatar_default.png)
Avoid the s390 compile "warning: 'pkcs1pad_encrypt_sign_complete' uses dynamic stack allocation" reported by kbuild test robot. Don't use a flat zero-filled buffer, instead zero the contents of the SGL. Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
628 lines
16 KiB
C
628 lines
16 KiB
C
/*
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* RSA padding templates.
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*
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* Copyright (c) 2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <crypto/algapi.h>
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#include <crypto/akcipher.h>
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#include <crypto/internal/akcipher.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/random.h>
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struct pkcs1pad_ctx {
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struct crypto_akcipher *child;
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unsigned int key_size;
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};
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struct pkcs1pad_request {
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struct akcipher_request child_req;
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struct scatterlist in_sg[3], out_sg[2];
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uint8_t *in_buf, *out_buf;
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};
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static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen)
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{
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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int err, size;
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err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
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if (!err) {
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/* Find out new modulus size from rsa implementation */
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size = crypto_akcipher_maxsize(ctx->child);
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ctx->key_size = size > 0 ? size : 0;
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if (size <= 0)
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err = size;
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}
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return err;
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}
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static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen)
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{
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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int err, size;
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err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
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if (!err) {
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/* Find out new modulus size from rsa implementation */
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size = crypto_akcipher_maxsize(ctx->child);
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ctx->key_size = size > 0 ? size : 0;
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if (size <= 0)
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err = size;
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}
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return err;
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}
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static int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
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{
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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/*
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* The maximum destination buffer size for the encrypt/sign operations
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* will be the same as for RSA, even though it's smaller for
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* decrypt/verify.
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*/
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return ctx->key_size ?: -EINVAL;
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}
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static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
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struct scatterlist *next)
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{
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int nsegs = next ? 1 : 0;
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if (offset_in_page(buf) + len <= PAGE_SIZE) {
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nsegs += 1;
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sg_init_table(sg, nsegs);
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sg_set_buf(sg, buf, len);
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} else {
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nsegs += 2;
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sg_init_table(sg, nsegs);
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sg_set_buf(sg + 0, buf, PAGE_SIZE - offset_in_page(buf));
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sg_set_buf(sg + 1, buf + PAGE_SIZE - offset_in_page(buf),
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offset_in_page(buf) + len - PAGE_SIZE);
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}
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if (next)
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sg_chain(sg, nsegs, next);
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}
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static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
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size_t pad_len = ctx->key_size - req_ctx->child_req.dst_len;
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size_t chunk_len, pad_left;
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struct sg_mapping_iter miter;
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if (!err) {
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if (pad_len) {
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sg_miter_start(&miter, req->dst,
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sg_nents_for_len(req->dst, pad_len),
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SG_MITER_ATOMIC | SG_MITER_TO_SG);
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pad_left = pad_len;
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while (pad_left) {
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sg_miter_next(&miter);
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chunk_len = min(miter.length, pad_left);
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memset(miter.addr, 0, chunk_len);
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pad_left -= chunk_len;
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}
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sg_miter_stop(&miter);
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}
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sg_pcopy_from_buffer(req->dst,
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sg_nents_for_len(req->dst, ctx->key_size),
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req_ctx->out_buf, req_ctx->child_req.dst_len,
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pad_len);
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}
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req->dst_len = ctx->key_size;
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kfree(req_ctx->in_buf);
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kzfree(req_ctx->out_buf);
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return err;
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}
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static void pkcs1pad_encrypt_sign_complete_cb(
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struct crypto_async_request *child_async_req, int err)
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{
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struct akcipher_request *req = child_async_req->data;
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struct crypto_async_request async_req;
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if (err == -EINPROGRESS)
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return;
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async_req.data = req->base.data;
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async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
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async_req.flags = child_async_req->flags;
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req->base.complete(&async_req,
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pkcs1pad_encrypt_sign_complete(req, err));
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}
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static int pkcs1pad_encrypt(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
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int err;
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unsigned int i, ps_end;
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if (!ctx->key_size)
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return -EINVAL;
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if (req->src_len > ctx->key_size - 11)
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return -EOVERFLOW;
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if (req->dst_len < ctx->key_size) {
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req->dst_len = ctx->key_size;
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return -EOVERFLOW;
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}
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if (ctx->key_size > PAGE_SIZE)
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return -ENOTSUPP;
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/*
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* Replace both input and output to add the padding in the input and
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* the potential missing leading zeros in the output.
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*/
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req_ctx->child_req.src = req_ctx->in_sg;
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req_ctx->child_req.src_len = ctx->key_size - 1;
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req_ctx->child_req.dst = req_ctx->out_sg;
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req_ctx->child_req.dst_len = ctx->key_size;
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req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
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(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC);
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if (!req_ctx->in_buf)
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return -ENOMEM;
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ps_end = ctx->key_size - req->src_len - 2;
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req_ctx->in_buf[0] = 0x02;
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for (i = 1; i < ps_end; i++)
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req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
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req_ctx->in_buf[ps_end] = 0x00;
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pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
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ctx->key_size - 1 - req->src_len, req->src);
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req_ctx->out_buf = kmalloc(ctx->key_size,
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(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC);
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if (!req_ctx->out_buf) {
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kfree(req_ctx->in_buf);
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return -ENOMEM;
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}
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pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
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ctx->key_size, NULL);
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akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
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akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
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pkcs1pad_encrypt_sign_complete_cb, req);
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err = crypto_akcipher_encrypt(&req_ctx->child_req);
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if (err != -EINPROGRESS &&
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(err != -EBUSY ||
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!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
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return pkcs1pad_encrypt_sign_complete(req, err);
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return err;
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}
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static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
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unsigned int pos;
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if (err == -EOVERFLOW)
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/* Decrypted value had no leading 0 byte */
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err = -EINVAL;
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if (err)
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goto done;
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if (req_ctx->child_req.dst_len != ctx->key_size - 1) {
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err = -EINVAL;
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goto done;
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}
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if (req_ctx->out_buf[0] != 0x02) {
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err = -EINVAL;
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goto done;
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}
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for (pos = 1; pos < req_ctx->child_req.dst_len; pos++)
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if (req_ctx->out_buf[pos] == 0x00)
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break;
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if (pos < 9 || pos == req_ctx->child_req.dst_len) {
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err = -EINVAL;
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goto done;
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}
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pos++;
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if (req->dst_len < req_ctx->child_req.dst_len - pos)
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err = -EOVERFLOW;
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req->dst_len = req_ctx->child_req.dst_len - pos;
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if (!err)
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sg_copy_from_buffer(req->dst,
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sg_nents_for_len(req->dst, req->dst_len),
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req_ctx->out_buf + pos, req->dst_len);
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done:
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kzfree(req_ctx->out_buf);
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return err;
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}
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static void pkcs1pad_decrypt_complete_cb(
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struct crypto_async_request *child_async_req, int err)
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{
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struct akcipher_request *req = child_async_req->data;
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struct crypto_async_request async_req;
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if (err == -EINPROGRESS)
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return;
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async_req.data = req->base.data;
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async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
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async_req.flags = child_async_req->flags;
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req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err));
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}
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static int pkcs1pad_decrypt(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
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int err;
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if (!ctx->key_size || req->src_len != ctx->key_size)
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return -EINVAL;
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if (ctx->key_size > PAGE_SIZE)
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return -ENOTSUPP;
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/* Reuse input buffer, output to a new buffer */
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req_ctx->child_req.src = req->src;
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req_ctx->child_req.src_len = req->src_len;
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req_ctx->child_req.dst = req_ctx->out_sg;
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req_ctx->child_req.dst_len = ctx->key_size - 1;
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req_ctx->out_buf = kmalloc(ctx->key_size - 1,
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(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC);
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if (!req_ctx->out_buf)
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return -ENOMEM;
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pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
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ctx->key_size - 1, NULL);
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akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
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akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
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pkcs1pad_decrypt_complete_cb, req);
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err = crypto_akcipher_decrypt(&req_ctx->child_req);
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if (err != -EINPROGRESS &&
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(err != -EBUSY ||
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!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
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return pkcs1pad_decrypt_complete(req, err);
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return err;
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}
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static int pkcs1pad_sign(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
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int err;
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unsigned int ps_end;
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if (!ctx->key_size)
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return -EINVAL;
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if (req->src_len > ctx->key_size - 11)
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return -EOVERFLOW;
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if (req->dst_len < ctx->key_size) {
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req->dst_len = ctx->key_size;
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return -EOVERFLOW;
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}
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if (ctx->key_size > PAGE_SIZE)
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return -ENOTSUPP;
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/*
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* Replace both input and output to add the padding in the input and
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* the potential missing leading zeros in the output.
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*/
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req_ctx->child_req.src = req_ctx->in_sg;
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req_ctx->child_req.src_len = ctx->key_size - 1;
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req_ctx->child_req.dst = req_ctx->out_sg;
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req_ctx->child_req.dst_len = ctx->key_size;
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req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
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(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC);
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if (!req_ctx->in_buf)
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return -ENOMEM;
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ps_end = ctx->key_size - req->src_len - 2;
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req_ctx->in_buf[0] = 0x01;
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memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
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req_ctx->in_buf[ps_end] = 0x00;
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pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
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ctx->key_size - 1 - req->src_len, req->src);
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req_ctx->out_buf = kmalloc(ctx->key_size,
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(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC);
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if (!req_ctx->out_buf) {
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kfree(req_ctx->in_buf);
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return -ENOMEM;
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}
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pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
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ctx->key_size, NULL);
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akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
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akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
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pkcs1pad_encrypt_sign_complete_cb, req);
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err = crypto_akcipher_sign(&req_ctx->child_req);
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if (err != -EINPROGRESS &&
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(err != -EBUSY ||
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!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
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return pkcs1pad_encrypt_sign_complete(req, err);
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return err;
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}
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static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
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unsigned int pos;
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if (err == -EOVERFLOW)
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/* Decrypted value had no leading 0 byte */
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err = -EINVAL;
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if (err)
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goto done;
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if (req_ctx->child_req.dst_len != ctx->key_size - 1) {
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err = -EINVAL;
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goto done;
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}
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if (req_ctx->out_buf[0] != 0x01) {
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err = -EINVAL;
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goto done;
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}
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for (pos = 1; pos < req_ctx->child_req.dst_len; pos++)
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if (req_ctx->out_buf[pos] != 0xff)
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break;
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if (pos < 9 || pos == req_ctx->child_req.dst_len ||
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req_ctx->out_buf[pos] != 0x00) {
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err = -EINVAL;
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goto done;
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}
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pos++;
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if (req->dst_len < req_ctx->child_req.dst_len - pos)
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err = -EOVERFLOW;
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req->dst_len = req_ctx->child_req.dst_len - pos;
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if (!err)
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sg_copy_from_buffer(req->dst,
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sg_nents_for_len(req->dst, req->dst_len),
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req_ctx->out_buf + pos, req->dst_len);
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done:
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kzfree(req_ctx->out_buf);
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return err;
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}
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static void pkcs1pad_verify_complete_cb(
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struct crypto_async_request *child_async_req, int err)
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{
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struct akcipher_request *req = child_async_req->data;
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struct crypto_async_request async_req;
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if (err == -EINPROGRESS)
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return;
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async_req.data = req->base.data;
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async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
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async_req.flags = child_async_req->flags;
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req->base.complete(&async_req, pkcs1pad_verify_complete(req, err));
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}
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/*
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* The verify operation is here for completeness similar to the verification
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* defined in RFC2313 section 10.2 except that block type 0 is not accepted,
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* as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
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* retrieve the DigestInfo from a signature, instead the user is expected
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* to call the sign operation to generate the expected signature and compare
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* signatures instead of the message-digests.
|
|
*/
|
|
static int pkcs1pad_verify(struct akcipher_request *req)
|
|
{
|
|
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
|
|
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
|
|
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
|
|
int err;
|
|
|
|
if (!ctx->key_size || req->src_len != ctx->key_size)
|
|
return -EINVAL;
|
|
|
|
if (ctx->key_size > PAGE_SIZE)
|
|
return -ENOTSUPP;
|
|
|
|
/* Reuse input buffer, output to a new buffer */
|
|
req_ctx->child_req.src = req->src;
|
|
req_ctx->child_req.src_len = req->src_len;
|
|
req_ctx->child_req.dst = req_ctx->out_sg;
|
|
req_ctx->child_req.dst_len = ctx->key_size - 1;
|
|
|
|
req_ctx->out_buf = kmalloc(ctx->key_size - 1,
|
|
(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
|
|
GFP_KERNEL : GFP_ATOMIC);
|
|
if (!req_ctx->out_buf)
|
|
return -ENOMEM;
|
|
|
|
pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
|
|
ctx->key_size - 1, NULL);
|
|
|
|
akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
|
|
akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
|
|
pkcs1pad_verify_complete_cb, req);
|
|
|
|
err = crypto_akcipher_verify(&req_ctx->child_req);
|
|
if (err != -EINPROGRESS &&
|
|
(err != -EBUSY ||
|
|
!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
|
|
return pkcs1pad_verify_complete(req, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
|
|
{
|
|
struct akcipher_instance *inst = akcipher_alg_instance(tfm);
|
|
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
|
|
struct crypto_akcipher *child_tfm;
|
|
|
|
child_tfm = crypto_spawn_akcipher(akcipher_instance_ctx(inst));
|
|
if (IS_ERR(child_tfm))
|
|
return PTR_ERR(child_tfm);
|
|
|
|
ctx->child = child_tfm;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
|
|
{
|
|
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
|
|
|
|
crypto_free_akcipher(ctx->child);
|
|
}
|
|
|
|
static void pkcs1pad_free(struct akcipher_instance *inst)
|
|
{
|
|
struct crypto_akcipher_spawn *spawn = akcipher_instance_ctx(inst);
|
|
|
|
crypto_drop_akcipher(spawn);
|
|
|
|
kfree(inst);
|
|
}
|
|
|
|
static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
struct akcipher_instance *inst;
|
|
struct crypto_akcipher_spawn *spawn;
|
|
struct akcipher_alg *rsa_alg;
|
|
const char *rsa_alg_name;
|
|
int err;
|
|
|
|
algt = crypto_get_attr_type(tb);
|
|
if (IS_ERR(algt))
|
|
return PTR_ERR(algt);
|
|
|
|
if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
|
|
return -EINVAL;
|
|
|
|
rsa_alg_name = crypto_attr_alg_name(tb[1]);
|
|
if (IS_ERR(rsa_alg_name))
|
|
return PTR_ERR(rsa_alg_name);
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
|
|
spawn = akcipher_instance_ctx(inst);
|
|
crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
|
|
err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
|
|
crypto_requires_sync(algt->type, algt->mask));
|
|
if (err)
|
|
goto out_free_inst;
|
|
|
|
rsa_alg = crypto_spawn_akcipher_alg(spawn);
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name,
|
|
CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
|
|
rsa_alg->base.cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME ||
|
|
snprintf(inst->alg.base.cra_driver_name,
|
|
CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
|
|
rsa_alg->base.cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto out_drop_alg;
|
|
|
|
inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
|
|
inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
|
|
inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
|
|
|
|
inst->alg.init = pkcs1pad_init_tfm;
|
|
inst->alg.exit = pkcs1pad_exit_tfm;
|
|
|
|
inst->alg.encrypt = pkcs1pad_encrypt;
|
|
inst->alg.decrypt = pkcs1pad_decrypt;
|
|
inst->alg.sign = pkcs1pad_sign;
|
|
inst->alg.verify = pkcs1pad_verify;
|
|
inst->alg.set_pub_key = pkcs1pad_set_pub_key;
|
|
inst->alg.set_priv_key = pkcs1pad_set_priv_key;
|
|
inst->alg.max_size = pkcs1pad_get_max_size;
|
|
inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize;
|
|
|
|
inst->free = pkcs1pad_free;
|
|
|
|
err = akcipher_register_instance(tmpl, inst);
|
|
if (err)
|
|
goto out_drop_alg;
|
|
|
|
return 0;
|
|
|
|
out_drop_alg:
|
|
crypto_drop_akcipher(spawn);
|
|
out_free_inst:
|
|
kfree(inst);
|
|
return err;
|
|
}
|
|
|
|
struct crypto_template rsa_pkcs1pad_tmpl = {
|
|
.name = "pkcs1pad",
|
|
.create = pkcs1pad_create,
|
|
.module = THIS_MODULE,
|
|
};
|