forked from lix-project/lix
422 lines
10 KiB
C++
422 lines
10 KiB
C++
#include <iostream>
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#include <cstring>
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#include <openssl/crypto.h>
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#include <openssl/md5.h>
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#include <openssl/sha.h>
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#include "args.hh"
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#include "hash.hh"
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#include "archive.hh"
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#include "split.hh"
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#include "util.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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namespace nix {
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static size_t regularHashSize(HashType type) {
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switch (type) {
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case htMD5: return md5HashSize;
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case htSHA1: return sha1HashSize;
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case htSHA256: return sha256HashSize;
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case htSHA512: return sha512HashSize;
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}
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abort();
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}
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std::set<std::string> hashTypes = { "md5", "sha1", "sha256", "sha512" };
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Hash::Hash(HashType type) : type(type)
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{
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hashSize = regularHashSize(type);
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assert(hashSize <= maxHashSize);
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memset(hash, 0, maxHashSize);
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}
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bool Hash::operator == (const Hash & h2) const
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{
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if (hashSize != h2.hashSize) return false;
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for (unsigned int i = 0; i < hashSize; i++)
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if (hash[i] != h2.hash[i]) return false;
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return true;
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}
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bool Hash::operator != (const Hash & h2) const
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{
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return !(*this == h2);
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}
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bool Hash::operator < (const Hash & h) const
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{
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if (hashSize < h.hashSize) return true;
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if (hashSize > h.hashSize) return false;
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for (unsigned int i = 0; i < hashSize; i++) {
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if (hash[i] < h.hash[i]) return true;
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if (hash[i] > h.hash[i]) return false;
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}
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return false;
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}
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const std::string base16Chars = "0123456789abcdef";
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static std::string printHash16(const Hash & hash)
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{
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std::string buf;
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buf.reserve(hash.hashSize * 2);
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for (unsigned int i = 0; i < hash.hashSize; i++) {
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buf.push_back(base16Chars[hash.hash[i] >> 4]);
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buf.push_back(base16Chars[hash.hash[i] & 0x0f]);
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}
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return buf;
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}
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// omitted: E O U T
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const std::string base32Chars = "0123456789abcdfghijklmnpqrsvwxyz";
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static std::string printHash32(const Hash & hash)
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{
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assert(hash.hashSize);
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size_t len = hash.base32Len();
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assert(len);
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std::string s;
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s.reserve(len);
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for (int n = (int) len - 1; n >= 0; n--) {
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unsigned int b = n * 5;
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unsigned int i = b / 8;
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unsigned int j = b % 8;
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unsigned char c =
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(hash.hash[i] >> j)
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| (i >= hash.hashSize - 1 ? 0 : hash.hash[i + 1] << (8 - j));
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s.push_back(base32Chars[c & 0x1f]);
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}
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return s;
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}
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std::string printHash16or32(const Hash & hash)
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{
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assert(hash.type);
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return hash.to_string(hash.type == htMD5 ? Base16 : Base32, false);
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}
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std::string Hash::to_string(Base base, bool includeType) const
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{
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std::string s;
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if (base == SRI || includeType) {
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s += printHashType(type);
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s += base == SRI ? '-' : ':';
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}
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switch (base) {
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case Base16:
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s += printHash16(*this);
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break;
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case Base32:
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s += printHash32(*this);
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break;
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case Base64:
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case SRI:
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s += base64Encode(std::string_view((const char *) hash, hashSize));
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break;
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}
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return s;
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}
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Hash Hash::dummy(htSHA256);
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Hash Hash::parseSRI(std::string_view original) {
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auto rest = original;
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// Parse the has type before the separater, if there was one.
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auto hashRaw = splitPrefixTo(rest, '-');
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if (!hashRaw)
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throw BadHash("hash '%s' is not SRI", original);
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HashType parsedType = parseHashType(*hashRaw);
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return Hash(rest, parsedType, true);
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}
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// Mutates the string to eliminate the prefixes when found
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static std::pair<std::optional<HashType>, bool> getParsedTypeAndSRI(std::string_view & rest)
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{
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bool isSRI = false;
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// Parse the hash type before the separator, if there was one.
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std::optional<HashType> optParsedType;
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{
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auto hashRaw = splitPrefixTo(rest, ':');
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if (!hashRaw) {
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hashRaw = splitPrefixTo(rest, '-');
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if (hashRaw)
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isSRI = true;
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}
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if (hashRaw)
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optParsedType = parseHashType(*hashRaw);
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}
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return {optParsedType, isSRI};
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}
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Hash Hash::parseAnyPrefixed(std::string_view original)
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{
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auto rest = original;
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auto [optParsedType, isSRI] = getParsedTypeAndSRI(rest);
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// Either the string or user must provide the type, if they both do they
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// must agree.
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if (!optParsedType)
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throw BadHash("hash '%s' does not include a type", rest);
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return Hash(rest, *optParsedType, isSRI);
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}
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Hash Hash::parseAny(std::string_view original, std::optional<HashType> optType)
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{
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auto rest = original;
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auto [optParsedType, isSRI] = getParsedTypeAndSRI(rest);
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// Either the string or user must provide the type, if they both do they
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// must agree.
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if (!optParsedType && !optType)
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throw BadHash("hash '%s' does not include a type, nor is the type otherwise known from context", rest);
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else if (optParsedType && optType && *optParsedType != *optType)
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throw BadHash("hash '%s' should have type '%s'", original, printHashType(*optType));
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HashType hashType = optParsedType ? *optParsedType : *optType;
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return Hash(rest, hashType, isSRI);
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}
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Hash Hash::parseNonSRIUnprefixed(std::string_view s, HashType type)
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{
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return Hash(s, type, false);
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}
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Hash::Hash(std::string_view rest, HashType type, bool isSRI)
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: Hash(type)
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{
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if (!isSRI && rest.size() == base16Len()) {
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auto parseHexDigit = [&](char c) {
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if (c >= '0' && c <= '9') return c - '0';
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if (c >= 'A' && c <= 'F') return c - 'A' + 10;
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if (c >= 'a' && c <= 'f') return c - 'a' + 10;
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throw BadHash("invalid base-16 hash '%s'", rest);
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};
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for (unsigned int i = 0; i < hashSize; i++) {
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hash[i] =
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parseHexDigit(rest[i * 2]) << 4
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| parseHexDigit(rest[i * 2 + 1]);
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}
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}
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else if (!isSRI && rest.size() == base32Len()) {
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for (unsigned int n = 0; n < rest.size(); ++n) {
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char c = rest[rest.size() - n - 1];
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unsigned char digit;
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for (digit = 0; digit < base32Chars.size(); ++digit) /* !!! slow */
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if (base32Chars[digit] == c) break;
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if (digit >= 32)
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throw BadHash("invalid base-32 hash '%s'", rest);
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unsigned int b = n * 5;
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unsigned int i = b / 8;
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unsigned int j = b % 8;
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hash[i] |= digit << j;
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if (i < hashSize - 1) {
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hash[i + 1] |= digit >> (8 - j);
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} else {
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if (digit >> (8 - j))
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throw BadHash("invalid base-32 hash '%s'", rest);
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}
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}
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}
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else if (isSRI || rest.size() == base64Len()) {
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auto d = base64Decode(rest);
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if (d.size() != hashSize)
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throw BadHash("invalid %s hash '%s'", isSRI ? "SRI" : "base-64", rest);
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assert(hashSize);
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memcpy(hash, d.data(), hashSize);
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}
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else
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throw BadHash("hash '%s' has wrong length for hash type '%s'", rest, printHashType(this->type));
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}
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Hash newHashAllowEmpty(std::string_view hashStr, std::optional<HashType> ht)
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{
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if (hashStr.empty()) {
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if (!ht)
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throw BadHash("empty hash requires explicit hash type");
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Hash h(*ht);
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warn("found empty hash, assuming '%s'", h.to_string(SRI, true));
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return h;
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} else
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return Hash::parseAny(hashStr, ht);
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}
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union Ctx
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{
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MD5_CTX md5;
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SHA_CTX sha1;
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SHA256_CTX sha256;
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SHA512_CTX sha512;
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};
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static void start(HashType ht, Ctx & ctx)
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{
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if (ht == htMD5) MD5_Init(&ctx.md5);
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else if (ht == htSHA1) SHA1_Init(&ctx.sha1);
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else if (ht == htSHA256) SHA256_Init(&ctx.sha256);
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else if (ht == htSHA512) SHA512_Init(&ctx.sha512);
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}
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static void update(HashType ht, Ctx & ctx,
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std::string_view data)
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{
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if (ht == htMD5) MD5_Update(&ctx.md5, data.data(), data.size());
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else if (ht == htSHA1) SHA1_Update(&ctx.sha1, data.data(), data.size());
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else if (ht == htSHA256) SHA256_Update(&ctx.sha256, data.data(), data.size());
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else if (ht == htSHA512) SHA512_Update(&ctx.sha512, data.data(), data.size());
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}
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static void finish(HashType ht, Ctx & ctx, unsigned char * hash)
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{
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if (ht == htMD5) MD5_Final(hash, &ctx.md5);
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else if (ht == htSHA1) SHA1_Final(hash, &ctx.sha1);
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else if (ht == htSHA256) SHA256_Final(hash, &ctx.sha256);
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else if (ht == htSHA512) SHA512_Final(hash, &ctx.sha512);
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}
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Hash hashString(HashType ht, std::string_view s)
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{
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Ctx ctx;
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Hash hash(ht);
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start(ht, ctx);
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update(ht, ctx, s);
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finish(ht, ctx, hash.hash);
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return hash;
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}
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Hash hashFile(HashType ht, const Path & path)
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{
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HashSink sink(ht);
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readFile(path, sink);
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return sink.finish().first;
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}
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HashSink::HashSink(HashType ht) : ht(ht)
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{
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ctx = new Ctx;
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bytes = 0;
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start(ht, *ctx);
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}
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HashSink::~HashSink()
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{
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bufPos = 0;
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delete ctx;
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}
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void HashSink::writeUnbuffered(std::string_view data)
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{
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bytes += data.size();
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update(ht, *ctx, data);
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}
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HashResult HashSink::finish()
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{
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flush();
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Hash hash(ht);
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nix::finish(ht, *ctx, hash.hash);
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return HashResult(hash, bytes);
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}
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HashResult HashSink::currentHash()
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{
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flush();
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Ctx ctx2 = *ctx;
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Hash hash(ht);
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nix::finish(ht, ctx2, hash.hash);
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return HashResult(hash, bytes);
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}
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HashResult hashPath(
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HashType ht, const Path & path, PathFilter & filter)
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{
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HashSink sink(ht);
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dumpPath(path, sink, filter);
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return sink.finish();
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}
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Hash compressHash(const Hash & hash, unsigned int newSize)
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{
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Hash h(hash.type);
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h.hashSize = newSize;
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for (unsigned int i = 0; i < hash.hashSize; ++i)
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h.hash[i % newSize] ^= hash.hash[i];
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return h;
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}
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std::optional<HashType> parseHashTypeOpt(std::string_view s)
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{
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if (s == "md5") return htMD5;
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else if (s == "sha1") return htSHA1;
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else if (s == "sha256") return htSHA256;
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else if (s == "sha512") return htSHA512;
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else return std::optional<HashType> {};
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}
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HashType parseHashType(std::string_view s)
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{
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auto opt_h = parseHashTypeOpt(s);
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if (opt_h)
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return *opt_h;
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else
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throw UsageError("unknown hash algorithm '%1%'", s);
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}
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std::string_view printHashType(HashType ht)
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{
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switch (ht) {
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case htMD5: return "md5";
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case htSHA1: return "sha1";
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case htSHA256: return "sha256";
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case htSHA512: return "sha512";
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default:
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// illegal hash type enum value internally, as opposed to external input
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// which should be validated with nice error message.
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assert(false);
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}
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}
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}
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