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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "digesttool.h"
#include "argparse.h"
#include "scoped_ptrs.h"
#include "util.h"
#include <algorithm>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <hasht.h> // contains supported digest types
#include <nss.h>
#include <pk11pub.h>
#include <prio.h>
static SECOidData* HashTypeToOID(HASH_HashType hashtype) {
SECOidTag hashtag;
if (hashtype <= HASH_AlgNULL || hashtype >= HASH_AlgTOTAL) {
return nullptr;
}
switch (hashtype) {
case HASH_AlgMD5:
hashtag = SEC_OID_MD5;
break;
case HASH_AlgSHA1:
hashtag = SEC_OID_SHA1;
break;
case HASH_AlgSHA224:
hashtag = SEC_OID_SHA224;
break;
case HASH_AlgSHA256:
hashtag = SEC_OID_SHA256;
break;
case HASH_AlgSHA384:
hashtag = SEC_OID_SHA384;
break;
case HASH_AlgSHA512:
hashtag = SEC_OID_SHA512;
break;
default:
return nullptr;
}
return SECOID_FindOIDByTag(hashtag);
}
static SECOidData* HashNameToOID(const std::string& hashName) {
for (size_t htype = HASH_AlgNULL + 1; htype < HASH_AlgTOTAL; htype++) {
SECOidData* hashOID = HashTypeToOID(static_cast<HASH_HashType>(htype));
if (hashOID && std::string(hashOID->desc) == hashName) {
return hashOID;
}
}
return nullptr;
}
static bool Digest(const ArgParser& parser, SECOidData* hashOID);
static bool ComputeDigest(std::istream& is, ScopedPK11Context& hashCtx);
bool DigestTool::Run(const std::vector<std::string>& arguments) {
ArgParser parser(arguments);
if (parser.GetPositionalArgumentCount() != 1) {
Usage();
return false;
}
// no need for a db for the digest tool
SECStatus rv = NSS_NoDB_Init(".");
if (rv != SECSuccess) {
std::cerr << "NSS init failed!" << std::endl;
return false;
}
std::string hashName = parser.GetPositionalArgument(0);
std::transform(hashName.begin(), hashName.end(), hashName.begin(), ::toupper);
SECOidData* hashOID = HashNameToOID(hashName);
if (hashOID == nullptr) {
std::cerr << "Error: Unknown digest type "
<< parser.GetPositionalArgument(0) << "." << std::endl;
return false;
}
bool ret = Digest(parser, hashOID);
// shutdown nss
if (NSS_Shutdown() != SECSuccess) {
std::cerr << "NSS Shutdown failed!" << std::endl;
return false;
}
return ret;
}
void DigestTool::Usage() {
std::cerr << "Usage: nss digest md5|sha-1|sha-224|sha-256|sha-384|sha-512 "
"[--infile <path>]"
<< std::endl;
}
static bool Digest(const ArgParser& parser, SECOidData* hashOID) {
std::string inputFile;
if (parser.Has("--infile")) {
inputFile = parser.Get("--infile");
}
ScopedPK11Context hashCtx(PK11_CreateDigestContext(hashOID->offset));
if (hashCtx == nullptr) {
std::cerr << "Creating digest context failed." << std::endl;
return false;
}
PK11_DigestBegin(hashCtx.get());
std::ifstream fis;
std::istream& is = GetStreamFromFileOrStdin(inputFile, fis);
if (!is.good() || !ComputeDigest(is, hashCtx)) {
return false;
}
unsigned char digest[HASH_LENGTH_MAX];
unsigned int len;
SECStatus rv = PK11_DigestFinal(hashCtx.get(), digest, &len, HASH_LENGTH_MAX);
if (rv != SECSuccess || len == 0) {
std::cerr << "Calculating final hash value failed." << std::endl;
return false;
}
// human readable output
for (size_t i = 0; i < len; i++) {
std::cout << std::setw(2) << std::setfill('0') << std::hex
<< static_cast<int>(digest[i]);
}
std::cout << std::endl;
return true;
}
static bool ComputeDigest(std::istream& is, ScopedPK11Context& hashCtx) {
while (is) {
unsigned char buf[4096];
is.read(reinterpret_cast<char*>(buf), sizeof(buf));
if (is.fail() && !is.eof()) {
std::cerr << "Error reading from input stream." << std::endl;
return false;
}
SECStatus rv = PK11_DigestOp(hashCtx.get(), buf, is.gcount());
if (rv != SECSuccess) {
std::cerr << "PK11_DigestOp failed." << std::endl;
return false;
}
}
return true;
}
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