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annotate ui/sslhelp.cpp @ 502:e551de11d8b6

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Properly handle the case that the file does not exist. TRUNCATE makes create file fail if the file does not exist but we need TRUNCATE in the case that the file already exists
author Andre Heinecke <aheinecke@intevation.de>
date Mon, 28 Apr 2014 09:18:07 +0000
parents 6c4f526a4c5b
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/