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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Heimdal crypto library: Diffie-Hellman functions</title>
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<p>
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<div class="contents">
<h1>Diffie-Hellman functions</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const DH_METHOD * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#gbfe13af1fef654a94a9be268df6d8809">DH_ltm_method</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">DH * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g76c6e12bd1f0b9977d80fee83b086031">DH_new</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">DH * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g2e97e03aee56c6094bb7fd6322b3ce68">DH_new_method</a> (ENGINE *engine)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g1f15312ca21e290ee714e86578820c35">DH_free</a> (DH *dh)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#gf7c3e51cba326865c3684012c2337df1">DH_up_ref</a> (DH *dh)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g9e1fdd62e3bfe4b671dbfc363f0e6297">DH_size</a> (const DH *dh)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g7a03e7589a8473ed34cf2a4177709c0e">DH_set_ex_data</a> (DH *dh, int idx, void *data)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g25fff6e977829c49410f046b8cc3471d">DH_get_ex_data</a> (DH *dh, int idx)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g11ef051e93bc408f3e7ba77d44c5d3cb">DH_generate_parameters_ex</a> (DH *dh, int prime_len, int generator, BN_GENCB *cb)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g8995ef180ab448fdedde5da65f6ea249">DH_check_pubkey</a> (const DH *dh, const BIGNUM *pub_key, int *codes)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#gb90ec6b9e64f62c05754731c0c13ea01">DH_generate_key</a> (DH *dh)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#gf8b793df62108341ed3dc54a0ca75ca8">DH_compute_key</a> (unsigned char *shared_key, const BIGNUM *peer_pub_key, DH *dh)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#ge8f6c9ec1c2e4904439227a952980fdd">DH_set_method</a> (DH *dh, const DH_METHOD *method)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const DH_METHOD * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g1e3dc0dbc1ba678716d28654c0eded84">DH_null_method</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#g6c63e1e8af5957d7f798439c854d06b6">DH_set_default_method</a> (const DH_METHOD *meth)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const DH_METHOD * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__hcrypto__dh.html#ge2b07654d087940e36e7583887d8b070">DH_get_default_method</a> (void)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
See the <a class="el" href="page_dh.html">DH - Diffie-Hellman key exchange</a> for description and examples. <hr><h2>Function Documentation</h2>
<a class="anchor" name="g8995ef180ab448fdedde5da65f6ea249"></a><!-- doxytag: member="dh.c::DH_check_pubkey" ref="g8995ef180ab448fdedde5da65f6ea249" args="(const DH *dh, const BIGNUM *pub_key, int *codes)" -->
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<td class="memname">int DH_check_pubkey </td>
<td>(</td>
<td class="paramtype">const DH * </td>
<td class="paramname"> <em>dh</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const BIGNUM * </td>
<td class="paramname"> <em>pub_key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>codes</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
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</div>
<div class="memdoc">
<p>
Check that the public key is sane.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>the local peer DH parameters. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pub_key</em> </td><td>the remote peer public key parameters. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>codes</em> </td><td>return that the failures of the pub_key are.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 on success, 0 on failure and *codes is set the the combined fail check for the public key </dd></dl>
<p>
Checks that the function performs are:<ul>
<li>pub_key is not negative</li></ul>
<p>
<ul>
<li>pub_key > 1 and pub_key < p - 1, to avoid small subgroups attack.</li></ul>
<p>
<ul>
<li>if g == 2, pub_key have more then one bit set, if bits set is 1, log_2(pub_key) is trival </li></ul>
</div>
</div><p>
<a class="anchor" name="gf8b793df62108341ed3dc54a0ca75ca8"></a><!-- doxytag: member="dh.c::DH_compute_key" ref="gf8b793df62108341ed3dc54a0ca75ca8" args="(unsigned char *shared_key, const BIGNUM *peer_pub_key, DH *dh)" -->
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<div class="memproto">
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<td class="memname">int DH_compute_key </td>
<td>(</td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"> <em>shared_key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const BIGNUM * </td>
<td class="paramname"> <em>peer_pub_key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Complute the shared secret key.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>shared_key</em> </td><td>the resulting shared key, need to be at least <a class="el" href="group__hcrypto__dh.html#g9e1fdd62e3bfe4b671dbfc363f0e6297">DH_size()</a> large. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>peer_pub_key</em> </td><td>the peer's public key. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>the dh key pair.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 on success. </dd></dl>
<p>
Checks that the pubkey passed in is valid using <a class="el" href="group__hcrypto__dh.html#g8995ef180ab448fdedde5da65f6ea249">DH_check_pubkey()</a>.
</div>
</div><p>
<a class="anchor" name="g1f15312ca21e290ee714e86578820c35"></a><!-- doxytag: member="dh.c::DH_free" ref="g1f15312ca21e290ee714e86578820c35" args="(DH *dh)" -->
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<div class="memproto">
<table class="memname">
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<td class="memname">void DH_free </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Free a DH object and release related resources, like ENGINE, that the object was using.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>object to be freed. </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="gb90ec6b9e64f62c05754731c0c13ea01"></a><!-- doxytag: member="dh.c::DH_generate_key" ref="gb90ec6b9e64f62c05754731c0c13ea01" args="(DH *dh)" -->
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<td class="memname">int DH_generate_key </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Generate a new DH private-public key pair. The dh parameter must be allocted first with <a class="el" href="group__hcrypto__dh.html#g76c6e12bd1f0b9977d80fee83b086031">DH_new()</a>. dh->p and dp->g must be set.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>dh parameter.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 on success. </dd></dl>
</div>
</div><p>
<a class="anchor" name="g11ef051e93bc408f3e7ba77d44c5d3cb"></a><!-- doxytag: member="dh.c::DH_generate_parameters_ex" ref="g11ef051e93bc408f3e7ba77d44c5d3cb" args="(DH *dh, int prime_len, int generator, BN_GENCB *cb)" -->
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<td class="memname">int DH_generate_parameters_ex </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>prime_len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>generator</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">BN_GENCB * </td>
<td class="paramname"> <em>cb</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
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<p>
Generate DH parameters for the DH object give parameters.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>The DH object to generate parameters for. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>prime_len</em> </td><td>length of the prime </td></tr>
<tr><td valign="top"></td><td valign="top"><em>generator</em> </td><td>generator, g </td></tr>
<tr><td valign="top"></td><td valign="top"><em>cb</em> </td><td>Callback parameters to show progress, can be NULL.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the maximum size in bytes of the out data. </dd></dl>
</div>
</div><p>
<a class="anchor" name="ge2b07654d087940e36e7583887d8b070"></a><!-- doxytag: member="dh.c::DH_get_default_method" ref="ge2b07654d087940e36e7583887d8b070" args="(void)" -->
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<td class="memname">const DH_METHOD* DH_get_default_method </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
</tr>
</table>
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<p>
Return the default DH implementation.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>pointer to a DH_METHOD. </dd></dl>
</div>
</div><p>
<a class="anchor" name="g25fff6e977829c49410f046b8cc3471d"></a><!-- doxytag: member="dh.c::DH_get_ex_data" ref="g25fff6e977829c49410f046b8cc3471d" args="(DH *dh, int idx)" -->
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<td class="memname">void* DH_get_ex_data </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>idx</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
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<p>
Get the data for index idx in the DH object.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>DH object. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>idx</em> </td><td>index to get the data for.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the object store in index idx </dd></dl>
</div>
</div><p>
<a class="anchor" name="gbfe13af1fef654a94a9be268df6d8809"></a><!-- doxytag: member="dh-ltm.c::DH_ltm_method" ref="gbfe13af1fef654a94a9be268df6d8809" args="(void)" -->
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<td class="memname">const DH_METHOD* DH_ltm_method </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
</tr>
</table>
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<p>
DH implementation using libtommath.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the DH_METHOD for the DH implementation using libtommath. </dd></dl>
</div>
</div><p>
<a class="anchor" name="g76c6e12bd1f0b9977d80fee83b086031"></a><!-- doxytag: member="dh.c::DH_new" ref="g76c6e12bd1f0b9977d80fee83b086031" args="(void)" -->
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<td class="memname">DH* DH_new </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
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<p>
Create a new DH object using DH_new_method(NULL), see <a class="el" href="group__hcrypto__dh.html#g2e97e03aee56c6094bb7fd6322b3ce68">DH_new_method()</a>.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>a newly allocated DH object. </dd></dl>
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<a class="anchor" name="g2e97e03aee56c6094bb7fd6322b3ce68"></a><!-- doxytag: member="dh.c::DH_new_method" ref="g2e97e03aee56c6094bb7fd6322b3ce68" args="(ENGINE *engine)" -->
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<td class="memname">DH* DH_new_method </td>
<td>(</td>
<td class="paramtype">ENGINE * </td>
<td class="paramname"> <em>engine</em> </td>
<td> ) </td>
<td></td>
</tr>
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<p>
Create a new DH object from the given engine, if the NULL is used, the default engine is used. Free the DH object with <a class="el" href="group__hcrypto__dh.html#g1f15312ca21e290ee714e86578820c35">DH_free()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>engine</em> </td><td>The engine to use to allocate the DH object.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>a newly allocated DH object. </dd></dl>
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</div><p>
<a class="anchor" name="g1e3dc0dbc1ba678716d28654c0eded84"></a><!-- doxytag: member="dh.c::DH_null_method" ref="g1e3dc0dbc1ba678716d28654c0eded84" args="(void)" -->
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<td class="memname">const DH_METHOD* DH_null_method </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
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<div class="memdoc">
<p>
Return the dummy DH implementation.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>pointer to a DH_METHOD. </dd></dl>
</div>
</div><p>
<a class="anchor" name="g6c63e1e8af5957d7f798439c854d06b6"></a><!-- doxytag: member="dh.c::DH_set_default_method" ref="g6c63e1e8af5957d7f798439c854d06b6" args="(const DH_METHOD *meth)" -->
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<td class="memname">void DH_set_default_method </td>
<td>(</td>
<td class="paramtype">const DH_METHOD * </td>
<td class="paramname"> <em>meth</em> </td>
<td> ) </td>
<td></td>
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<p>
Set the default DH implementation.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>meth</em> </td><td>pointer to a DH_METHOD. </td></tr>
</table>
</dl>
</div>
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<a class="anchor" name="g7a03e7589a8473ed34cf2a4177709c0e"></a><!-- doxytag: member="dh.c::DH_set_ex_data" ref="g7a03e7589a8473ed34cf2a4177709c0e" args="(DH *dh, int idx, void *data)" -->
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<td class="memname">int DH_set_ex_data </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>idx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>data</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>
Set the data index idx in the DH object to data.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>DH object. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>idx</em> </td><td>index to set the data for. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>data to store for the index idx.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 on success. </dd></dl>
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</div><p>
<a class="anchor" name="ge8f6c9ec1c2e4904439227a952980fdd"></a><!-- doxytag: member="dh.c::DH_set_method" ref="ge8f6c9ec1c2e4904439227a952980fdd" args="(DH *dh, const DH_METHOD *method)" -->
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<td class="memname">int DH_set_method </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const DH_METHOD * </td>
<td class="paramname"> <em>method</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<div class="memdoc">
<p>
Set a new method for the DH keypair.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>dh parameter. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>method</em> </td><td>the new method for the DH parameter.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 on success. </dd></dl>
</div>
</div><p>
<a class="anchor" name="g9e1fdd62e3bfe4b671dbfc363f0e6297"></a><!-- doxytag: member="dh.c::DH_size" ref="g9e1fdd62e3bfe4b671dbfc363f0e6297" args="(const DH *dh)" -->
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<td class="memname">int DH_size </td>
<td>(</td>
<td class="paramtype">const DH * </td>
<td class="paramname"> <em>dh</em> </td>
<td> ) </td>
<td></td>
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<p>
The maximum output size of the <a class="el" href="group__hcrypto__dh.html#gf8b793df62108341ed3dc54a0ca75ca8">DH_compute_key()</a> function.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>The DH object to get the size from.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the maximum size in bytes of the out data. </dd></dl>
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<a class="anchor" name="gf7c3e51cba326865c3684012c2337df1"></a><!-- doxytag: member="dh.c::DH_up_ref" ref="gf7c3e51cba326865c3684012c2337df1" args="(DH *dh)" -->
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<td class="memname">int DH_up_ref </td>
<td>(</td>
<td class="paramtype">DH * </td>
<td class="paramname"> <em>dh</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
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<div class="memdoc">
<p>
Add a reference to the DH object. The object should be free with <a class="el" href="group__hcrypto__dh.html#g1f15312ca21e290ee714e86578820c35">DH_free()</a> to drop the reference.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dh</em> </td><td>the object to increase the reference count too.</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the updated reference count, can't safely be used except for debug printing. </dd></dl>
</div>
</div><p>
</div>
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