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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/boot/signature-verify.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">签名校验</h1><div class="date inPage">25 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d287591e22__20250121171755">U-Boot 官方的代码，SPL 支持 FIT image 的签名。如果固件使用其他格式， 需要自行添加相应的校验支持。</p><section class="- topic/section section" id="concept_lx3_tn3_pzb__section_lll_y1h_bzb" data-ofbid="concept_lx3_tn3_pzb__section_lll_y1h_bzb"><h2 class="- topic/title title sectiontitle">FIT Image 签名校验</h2>
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<div class="- topic/p p" data-ofbid="d287591e29__20250121171755">要实现验证 FIT Image 的签名，需要在配置中打开 CONFIG_SPL_FIT_SIGNATURE
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选项：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_lx3_tn3_pzb__codeblock_psv_msy_c1c" data-ofbid="concept_lx3_tn3_pzb__codeblock_psv_msy_c1c">mmc_load_image_raw_sector(); <em class="hl-comment">// common/spl/spl_mmc.c</em>
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|-> spl_get_load_buffer(-<strong class="hl-keyword">sizeof</strong>(*header), bd->blksz);
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|-> blk_dread(bd, sector, <span class="hl-number">1</span>, header);
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|-> image_get_magic(header) == FDT_MAGIC <em class="hl-comment">// 判断是否为 FIT Image</em>
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|-> spl_load_simple_fit(spl_image, &load, sector, header); <em class="hl-comment">// common/spl/spl_fit.c</em>
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|-> info->read(info, sector, sectors, fit);
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| h_spl_load_read(info, sector, sectors, fit); <em class="hl-comment">// common/spl/spl_mmc.c</em>
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| |-> blk_dread(mmc_get_blk_desc(mmc), sector, count, buf);
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|-> node = spl_fit_get_image_node(fit, images, <span class="hl-string">"loadables"</span>, <span class="hl-number">0</span>);
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|-> spl_load_fit_image(info, sector, fit, base_offset, node,
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| spl_image); <em class="hl-comment">// common/spl/spl_fit.c</em>
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|-> <em class="hl-comment">// 中间加载过程</em>
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|-> fit_image_verify_with_data(fit, node, src, length);
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| <em class="hl-comment">// common/image-fit.c</em>
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|-> fit_image_check_sig(fit, noffset, data, size, -<span class="hl-number">1</span>, &err_msg);
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| <em class="hl-comment">// common/image-sig.c</em>
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|-> fit_image_setup_verify();
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|-> fit_image_hash_get_value();
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|-> info.crypto->verify(&info, &region, <span class="hl-number">1</span>,
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fit_value, fit_value_len);
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rsa_verify(&info, &region, <span class="hl-number">1</span>,
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fit_value, fit_value_len);
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<em class="hl-comment">// lib/rsa/rsa-verify.c</em></pre></div>
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<p class="- topic/p p" data-ofbid="d287591e34__20250121171755">此处的 rsa-verify 可以对接到硬件 CE，具体可看 <span class="+ topic/keyword pr-d/parmname keyword parmname">UCLASS_MOD_EXP</span> 的相关内容。
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如果没有硬件加速器的实现，则使用软件进行计算。</p>
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</section><section class="- topic/section section" id="concept_lx3_tn3_pzb__section_oll_y1h_bzb" data-ofbid="concept_lx3_tn3_pzb__section_oll_y1h_bzb"><h2 class="- topic/title title sectiontitle">AIC Image 签名校验</h2>
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<p class="- topic/p p" data-ofbid="d287591e45__20250121171755">制作 SD 量产卡时，由于 Updater U-Boot 固件需要使用 AIC Image 格式， 因此 SD 量产卡启动过程中，SPL-Updater 需要解析 AIC
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Image 格式。</p>
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<p class="- topic/p p" data-ofbid="d287591e48__20250121171755">为了平台的安全，BROM 所执行的程序必须经过安全验证。BROM 只支持 AIC Image 格式的固件，因此这里 Updater U-Boot 必须使用 AIC
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Image 格式。</p>
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<div class="- topic/p p" data-ofbid="d287591e51__20250121171755">在下列两种情况下，会使用 Updater U-Boot：<ul class="- topic/ul ul" id="concept_lx3_tn3_pzb__ul_wlw_mcx_5dc" data-ofbid="concept_lx3_tn3_pzb__ul_wlw_mcx_5dc"><li class="- topic/li li" data-ofbid="d287591e54__20250121171755">
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<p class="- topic/p p" data-ofbid="d287591e56__20250121171755">通过 USB 升级时，通过 BROM 将 Updater U-Boot 下载到 DRAM，并且由 BROM 执行。</p>
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</li><li class="- topic/li li" data-ofbid="d287591e59__20250121171755">
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<p class="- topic/p p" data-ofbid="d287591e61__20250121171755">将 Updater U-Boot 烧录到 SD 量产卡，从 SD 卡启动到 Updater U-Boot 进入升级程序。</p>
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</li></ul></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#concept_lx3_tn3_pzb__section_lll_y1h_bzb" data-tocid="concept_lx3_tn3_pzb__section_lll_y1h_bzb">FIT Image 签名校验</a></div></li><li class="section-item"><div class="section-title"><a href="#concept_lx3_tn3_pzb__section_oll_y1h_bzb" data-tocid="concept_lx3_tn3_pzb__section_oll_y1h_bzb">AIC Image 签名校验</a></div></li></ul></div>
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