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VIA PadLock
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<h2 id="instructions">Instructions</h2> <p>The PadLock instruction set can be divided into four subsets:<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p> <ul><li><a href="/facts/Random_number_generation/RtXEfbzd">Random number generation</a> (RNG) <ul><li>XSTORE: Store Available Random Bytes (aka XSTORERNG)</li> <li>REP XSTORE: Store ECX Random Bytes</li></ul></li> <li>Advanced cryptography engine (ACE) - for AES crypto; two versions <ul><li>REP XCRYPTECB: <a href="/facts/Electronic_code_book/vIUabB2z">Electronic code book</a></li> <li>REP XCRYPTCBC: <a href="/facts/Cipher_Block_Chaining/vIUabB2z">Cipher Block Chaining</a></li> <li>REP XCRYPTCTR: Counter Mode (ACE2)</li> <li>REP XCRYPTCFB: Cipher Feedback Mode</li> <li>REP XCRYPTOFB: Output Feedback Mode</li></ul></li> <li>SHA hash engine (PHE) <ul><li>REP XSHA1: Hash Function SHA-1</li> <li>REP XSHA256: Hash Function SHA-256</li></ul></li> <li>Montgomery multiplier (PMM) <ul><li>REP MONTMUL</li></ul></li></ul> <p>The padlock capability is indicated via a <a href="/facts/CPUID/BdbdpdgB">CPUID</a> instruction with EAX = 0xC0000000. If the resultant EAX >= 0xC0000001, the CPU is aware of Centaur features. An additional request with EAX = 0xC0000001 then returns PadLock support in EDX. The padlock capability can be toggled on or off with MSR 0X1107.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p><p>VIA PadLock found on some <a href="/facts/Zhaoxin/2wpVktlp">Zhaoxin</a> CPUs have <a href="/facts/SM3_(hash_function)/pdIyJ5jN">SM3</a> hashing and <a href="/facts/SM4_(cipher)/05jCyaFf">SM4</a> block cipher added.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p> <h3>CPUs with PadLock</h3> <p class="note">See also: <a href="/facts/List_of_VIA_microprocessors/zxkSpECS">List of VIA microprocessors</a></p> <ul><li>All VIA Nano CPUs support SHA, AES, and RNG.</li> <li>All VIA Eden CPUs since 2003 (C3 Nehemiah) support AES and RNG. All these released since 2006 support AES, RNG, SHA, and PMM.</li> <li>All VIA C7 CPUs support AES, RNG, SHA, and PMM.</li></ul> <h2 id="supporting-software">Supporting software</h2> <ul><li><a href="/facts/Linux_kernel/dlkduHuA">Linux kernel</a> since 2.6.11 has PadLock AES. PadLock SHA was introduced in 2.6.19. These are handled as "hardware crypto devices".<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></li> <li><a href="/facts/FreeBSD/RKsFTm7F">FreeBSD</a>, <a href="/facts/NetBSD/PTm5HWls">NetBSD</a> and <a href="/facts/OpenBSD/xmPS9tek">OpenBSD</a> support PadLock.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></li> <li><a href="/facts/OpenSSL/aXvs5fo2">OpenSSL</a> supports PadLock AES and SHA since 2004 (0.9.7f/0.9.8a).<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></li> <li><a href="/facts/GNU_assembler/j2Xo6Fbj">GNU assembler</a> supports PadLock since 2004.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a></li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/AES_instruction_set/NomFEB4w">AES instruction set</a></li> <li><a href="/facts/Block_cipher_mode_of_operation/vIUabB2z">Block cipher mode of operation</a></li> <li><a href="/facts/Intel_SHA_extensions/qDzy2N70">Intel SHA extensions</a></li> <li><a href="/facts/RDRAND/IdeN4y36">RDRAND</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"VIA PadLock Programming Guide". August 4, 2005. Archived from the original on May 26, 2010. <a href="https://web.archive.org/web/20100526054140/http://linux.via.com.tw/support/beginDownload.action?eleid=181&fid=261" target="_blank">https://web.archive.org/web/20100526054140/http://linux.via.com.tw/support/beginDownload.action?eleid=181&fid=261</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"VIA PadLock - Wicked Fast Encryption". www.logix.cz. <a href="http://www.logix.cz/michal/doc/article.xp/padlock-en" target="_blank">http://www.logix.cz/michal/doc/article.xp/padlock-en</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"VIA PadLock Programming Guide". August 4, 2005. Archived from the original on May 26, 2010. <a href="https://web.archive.org/web/20100526054140/http://linux.via.com.tw/support/beginDownload.action?eleid=181&fid=261" target="_blank">https://web.archive.org/web/20100526054140/http://linux.via.com.tw/support/beginDownload.action?eleid=181&fid=261</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"VIA PadLock Programming Guide". August 4, 2005. Archived from the original on May 26, 2010. <a href="https://web.archive.org/web/20100526054140/http://linux.via.com.tw/support/beginDownload.action?eleid=181&fid=261" target="_blank">https://web.archive.org/web/20100526054140/http://linux.via.com.tw/support/beginDownload.action?eleid=181&fid=261</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Kaixian ZX-C+ Series 4-core CPU". Shanghai Zhaoxin Semiconductor Co., Ltd. <a href="http://en.zhaoxin.com/ZXC.aspx?seriesid=5" target="_blank">http://en.zhaoxin.com/ZXC.aspx?seriesid=5</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"VIA PadLock support for Linux". www.logix.cz. <a href="http://www.logix.cz/michal/devel/padlock/" target="_blank">http://www.logix.cz/michal/devel/padlock/</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>padlock(4) – FreeBSD Kernel Interfaces Manual <a href="https://www.freebsd.org/cgi/man.cgi?query=padlock&sektion=4" target="_blank">https://www.freebsd.org/cgi/man.cgi?query=padlock&sektion=4</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"openssl/engines/e_padlock.c". GitHub. 26 November 2022. <a href="https://github.com/openssl/openssl/blob/master/engines/e_padlock.c" target="_blank">https://github.com/openssl/openssl/blob/master/engines/e_padlock.c</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"Added new instructions for next version of VIA PadLock core. · bminor/binutils-gdb@30d1c83". GitHub. <a href="https://github.com/bminor/binutils-gdb/commit/30d1c83669cde497bd6816d05b62e1cfd37146d2#diff-7b0511339617c8293942595285f45b07" target="_blank">https://github.com/bminor/binutils-gdb/commit/30d1c83669cde497bd6816d05b62e1cfd37146d2#diff-7b0511339617c8293942595285f45b07</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> </ol>