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annotate ui/sslhelp.cpp @ 475:6c4f526a4c5b

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Fix off by one error
author Andre Heinecke <aheinecke@intevation.de>
date Thu, 24 Apr 2014 09:41:42 +0000
parents f9b0014cff97
children c8a6a3e6bdeb
rev   line source
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 #include "sslhelp.h"
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9 #include <polarssl/sha256.h>
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10 #include <polarssl/pk.h>
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11 #include <polarssl/entropy.h>
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12 #include <polarssl/ctr_drbg.h>
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13 #include <QApplication>
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14 #include <QUuid>
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15 #include <QDebug>
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16
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17 QString getPolarSSLErrorMsg(int ret)
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18 {
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19 char errbuf[1020];
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20 polarssl_strerror(ret, errbuf, 1020);
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21 errbuf[1019] = '\0'; /* Just to be sure */
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22 return QString::fromLatin1(errbuf);
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23 }
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24
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25 QByteArray sha256sum(const QByteArray& data)
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26 {
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27 unsigned char output[32];
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28 sha256((unsigned char *)data.constData(), (size_t)data.size(), output, 0);
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29 return QByteArray((const char *)output, 32);
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30 }
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31
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32 QByteArray rsaSignSHA256Hash(const QByteArray& hash, pk_context *pk)
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33 {
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34 int ret = 0;
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35 unsigned char sig[POLARSSL_MPI_MAX_SIZE];
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36 size_t sig_len;
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37 entropy_context entropy;
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38 ctr_drbg_context ctr_drbg;
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39
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40 entropy_init(&entropy);
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41
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42 QUuid uuid = QUuid::createUuid();
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43 QString personalString = QApplication::applicationName() + uuid.toString();
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44 QByteArray personalBa = personalString.toLocal8Bit();
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45
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46 /*
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47 * Initialize random generator.
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48 * Personalisation string, does not need to be random but
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49 * should be unique according to documentation.
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50 *
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51 * the ctr_drbg structure does not need to be freed explicitly.
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52 */
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53 ret = ctr_drbg_init(&ctr_drbg, entropy_func, &entropy,
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54 (const unsigned char*) personalBa.constData(),
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55 personalBa.size());
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56 if (ret != 0) {
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57 qDebug() << "Failed to initialize drbg: " << getPolarSSLErrorMsg(ret);
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58 entropy_free (&entropy);
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59 return QByteArray();
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60 }
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61
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62 ret = pk_sign(pk, POLARSSL_MD_SHA256, (const unsigned char*) hash.constData(),
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63 hash.size(), sig, &sig_len, ctr_drbg_random, &ctr_drbg);
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64 entropy_free (&entropy);
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65
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66 if (ret != 0) {
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67 qDebug() << "Failed to sign: " << getPolarSSLErrorMsg(ret);
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68 return QByteArray();
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69 }
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70
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71 if (sig_len != 3072 / 8) {
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72 qDebug() << "Invalid size of signature: " << sig_len;
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73 return QByteArray();
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74 }
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75
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76 return QByteArray((const char *)sig, (int)sig_len);
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77 }
http://wald.intevation.org/projects/trustbridge/