#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>

#include "rnd.h"
#include "die.h"
#include "str.h"
#include "crypto.h"
#include "curve.h"
#include "ioops.h"
#include "config.h"
#include "keypair.h"

void generate_keypair(void)
{
	struct passwd *pw = getpwuid(getuid());
	unsigned char publickey[crypto_box_pub_key_size];
	unsigned char secretkey[crypto_box_sec_key_size];
	char file[128];

	xmemset(publickey, 0, sizeof(publickey));
	xmemset(secretkey, 0, sizeof(secretkey));

	curve25519_selftest();

	printf("Reading from %s (this may take a while) ...\n",
	       HIG_ENTROPY_SOURCE);

	gen_key_bytes(secretkey, sizeof(secretkey));
	crypto_scalarmult_curve25519_base(publickey, secretkey);

	slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PUBKEY);
	write_blob_or_die(file, publickey, sizeof(publickey));
	printf("Public key written to %s!\n", file);

	slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
	write_blob_or_die(file, secretkey, sizeof(secretkey));
	printf("Secret key written to %s!\n", file);

	xmemset(publickey, 0, sizeof(publickey));
	xmemset(secretkey, 0, sizeof(secretkey));
}

void verify_keypair(void)
{
	int result;
	struct passwd *pw = getpwuid(getuid());
	unsigned char publickey[crypto_box_pub_key_size];
	unsigned char publicres[crypto_box_pub_key_size];
	unsigned char secretkey[crypto_box_sec_key_size];
	char file[128];

	curve25519_selftest();

	xmemset(publickey, 0, sizeof(publickey));
	xmemset(publicres, 0, sizeof(publicres));
	xmemset(secretkey, 0, sizeof(secretkey));

	slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PUBKEY);
	read_blob_or_die(file, publickey, sizeof(publickey));

	slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
	read_blob_or_die(file, secretkey, sizeof(secretkey));

	crypto_scalarmult_curve25519_base(publicres, secretkey);
	result = crypto_verify_32(publicres, publickey);

	xmemset(publickey, 0, sizeof(publickey));
	xmemset(publicres, 0, sizeof(publicres));
	xmemset(secretkey, 0, sizeof(secretkey));

	if (result)
		panic("Keypair is corrupt! You need to regenerate!\n");
}
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='ceb16a90136f42a0079b12d163c824b5825933f7'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2016-09-20 22:46:14 -0400</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2016-09-20 22:46:14 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=ceb16a90136f42a0079b12d163c824b5825933f7'>ceb16a90136f42a0079b12d163c824b5825933f7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=ceb16a90136f42a0079b12d163c824b5825933f7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=ceb16a90136f42a0079b12d163c824b5825933f7'>66203a8fc28e7df795c26cedae5e3e49eb160d47</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=67a99b7061c07b190ac6c39f136afedbb7aa86e9'>67a99b7061c07b190ac6c39f136afedbb7aa86e9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=ceb16a90136f42a0079b12d163c824b5825933f7&amp;id2=67a99b7061c07b190ac6c39f136afedbb7aa86e9'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=4de349e786a3a2d51bd02d56f3de151bbc3c3df9'>4de349e786a3a2d51bd02d56f3de151bbc3c3df9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=ceb16a90136f42a0079b12d163c824b5825933f7&amp;id2=4de349e786a3a2d51bd02d56f3de151bbc3c3df9'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'linux-can-fixes-for-4.8-20160919' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can</div><div class='commit-msg'>Marc Kleine-Budde says:

====================
pull-request: can 2016-09-19

this is a pull request of one patch for the upcoming linux-4.8 release.

The patch by Fabio Estevam fixes the pm handling in the flexcan driver.
====================

Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=ceb16a90136f42a0079b12d163c824b5825933f7'>Diffstat</a></div><table summary='diffstat' class='diffstat'>