diff options
Diffstat (limited to 'third_party/nix/src/libutil/hash.cc')
| -rw-r--r-- | third_party/nix/src/libutil/hash.cc | 484 |
1 files changed, 0 insertions, 484 deletions
diff --git a/third_party/nix/src/libutil/hash.cc b/third_party/nix/src/libutil/hash.cc deleted file mode 100644 index ba61254392..0000000000 --- a/third_party/nix/src/libutil/hash.cc +++ /dev/null @@ -1,484 +0,0 @@ -#include "libutil/hash.hh" - -#include <cstring> -#include <iostream> - -#include <absl/strings/escaping.h> -#include <absl/strings/str_format.h> -#include <fcntl.h> -#include <glog/logging.h> -#include <openssl/md5.h> -#include <openssl/sha.h> -#include <sys/stat.h> -#include <sys/types.h> - -#include "libutil/archive.hh" -#include "libutil/istringstream_nocopy.hh" -#include "libutil/util.hh" - -namespace nix { - -std::optional<HashType> hash_type_from(nix::proto::HashType hash_type) { - switch (hash_type) { - case nix::proto::HashType::UNKNOWN: - return HashType::htUnknown; - case nix::proto::HashType::MD5: - return HashType::htMD5; - case nix::proto::HashType::SHA1: - return HashType::htSHA1; - case nix::proto::HashType::SHA256: - return HashType::htSHA256; - case nix::proto::HashType::SHA512: - return HashType::htSHA512; - default: - return {}; - } -} - -nix::proto::HashType HashTypeToProto(HashType hash_type) { - switch (hash_type) { - case HashType::htMD5: - return nix::proto::HashType::MD5; - case HashType::htSHA1: - return nix::proto::HashType::SHA1; - case HashType::htSHA256: - return nix::proto::HashType::SHA256; - case HashType::htSHA512: - return nix::proto::HashType::SHA512; - default: - return nix::proto::HashType::UNKNOWN; - } -} - -void Hash::init() { - if (type == htMD5) { - hashSize = md5HashSize; - } else if (type == htSHA1) { - hashSize = sha1HashSize; - } else if (type == htSHA256) { - hashSize = sha256HashSize; - } else if (type == htSHA512) { - hashSize = sha512HashSize; - } else { - abort(); - } - assert(hashSize <= maxHashSize); - memset(hash, 0, maxHashSize); -} - -bool Hash::operator==(const Hash& h2) const { - if (hashSize != h2.hashSize) { - return false; - } - for (unsigned int i = 0; i < hashSize; i++) { - if (hash[i] != h2.hash[i]) { - return false; - } - } - return true; -} - -bool Hash::operator!=(const Hash& h2) const { return !(*this == h2); } - -bool Hash::operator<(const Hash& h) const { - if (hashSize < h.hashSize) { - return true; - } - if (hashSize > h.hashSize) { - return false; - } - for (unsigned int i = 0; i < hashSize; i++) { - if (hash[i] < h.hash[i]) { - return true; - } - if (hash[i] > h.hash[i]) { - return false; - } - } - return false; -} - -const std::string base16Chars = "0123456789abcdef"; - -static std::string printHash16(const Hash& hash) { - char buf[hash.hashSize * 2]; - for (unsigned int i = 0; i < hash.hashSize; i++) { - buf[i * 2] = base16Chars[hash.hash[i] >> 4]; - buf[i * 2 + 1] = base16Chars[hash.hash[i] & 0x0f]; - } - return std::string(buf, hash.hashSize * 2); -} - -bool Hash::IsValidBase16(absl::string_view s) { - for (char c : s) { - if ('0' <= c && c <= '9') { - continue; - } - if ('a' <= c && c <= 'f') { - continue; - } - if ('A' <= c && c <= 'F') { - continue; - } - return false; - } - return true; -} - -constexpr signed char kUnBase32[] = { - -1, -1, -1, -1, -1, -1, -1, -1, /* unprintables */ - -1, -1, -1, -1, -1, -1, -1, -1, /* unprintables */ - -1, -1, -1, -1, -1, -1, -1, -1, /* unprintables */ - -1, -1, -1, -1, -1, -1, -1, -1, /* unprintables */ - -1, -1, -1, -1, -1, -1, -1, -1, /* SP..' */ - -1, -1, -1, -1, -1, -1, -1, -1, /* (../ */ - 0, 1, 2, 3, 4, 5, 6, 7, /* 0..7 */ - 8, 9, -1, -1, -1, -1, -1, -1, /* 8..? */ - -1, -1, -1, -1, -1, -1, -1, -1, /* @..G */ - -1, -1, -1, -1, -1, -1, -1, -1, /* H..O */ - -1, -1, -1, -1, -1, -1, -1, -1, /* P..W */ - -1, -1, -1, -1, -1, -1, -1, -1, /* X.._ */ - -1, 10, 11, 12, 13, -1, 14, 15, /* `..g */ - 16, 17, 18, 19, 20, 21, 22, -1, /* h..o */ - 23, 24, 25, 26, -1, -1, 27, 28, /* p..w */ - 29, 30, 31, -1, -1, -1, -1, -1, /* x..DEL */ - - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* high */ -}; - -bool Hash::IsValidBase32(absl::string_view s) { - static_assert(sizeof(kUnBase32) == 256); - - for (char c : s) { - if (kUnBase32[static_cast<unsigned char>(c)] == -1) { - return false; - } - } - return true; -} - -std::string Hash::ToStorePathHash() const { - return compressHash(*this, kStorePathHashSize).to_string(Base32, false); -} - -static std::string printHash32(const Hash& hash) { - assert(hash.hashSize); - size_t len = hash.base32Len(); - assert(len); - - std::string s; - s.reserve(len); - - for (int n = static_cast<int>(len) - 1; n >= 0; n--) { - unsigned int b = n * 5; - unsigned int i = b / 8; - unsigned int j = b % 8; - unsigned char c = - (hash.hash[i] >> j) | - (i >= hash.hashSize - 1 ? 0 : hash.hash[i + 1] << (8 - j)); - s.push_back(base32Chars[c & 0x1f]); - } - - return s; -} - -std::string printHash16or32(const Hash& hash) { - return hash.to_string(hash.type == htMD5 ? Base16 : Base32, false); -} - -std::string Hash::to_string(Base base, bool includeType) const { - std::string s; - if (base == SRI || includeType) { - s += printHashType(type); - s += base == SRI ? '-' : ':'; - } - switch (base) { - case Base16: - s += printHash16(*this); - break; - case Base32: - s += printHash32(*this); - break; - case Base64: - case SRI: - std::string b64; - absl::Base64Escape( - std::string(reinterpret_cast<const char*>(hash), hashSize), &b64); - s += b64; - break; - } - return s; -} - -Hash::Hash(std::string_view s, HashType type) : type(type) { - absl::StatusOr<Hash> result = deserialize(s, type); - *this = unwrap_throw(result); -} - -// TODO(riking): change ht to an optional -absl::StatusOr<Hash> Hash::deserialize(std::string_view s, HashType type) { - size_t pos = 0; - bool isSRI = false; - - auto sep = s.find(':'); - if (sep == std::string::npos) { - sep = s.find('-'); - if (sep != std::string::npos) { - isSRI = true; - } else if (type == htUnknown) { - return absl::InvalidArgumentError( - absl::StrCat("hash string '", s, " does not include a type")); - } - } - - HashType parsedType = type; - if (sep != std::string::npos) { - std::string hts = std::string(s, 0, sep); - parsedType = parseHashType(hts); - if (type != htUnknown && parsedType != type) { - return absl::InvalidArgumentError( - absl::StrCat("hash '", s, "' should have type '", printHashType(type), - "', found '", printHashType(parsedType), "'")); - } - pos = sep + 1; - } - - Hash dest(parsedType); - - size_t size = s.size() - pos; - absl::string_view sv(s.data() + pos, size); - - if (!isSRI && size == dest.base16Len()) { - std::string bytes; - if (!IsValidBase16(sv)) { - return absl::InvalidArgumentError( - absl::StrCat("invalid base-16 hash: bad character in '", s, "'")); - } - bytes = absl::HexStringToBytes(sv); - if (bytes.size() != dest.hashSize) { - return absl::InvalidArgumentError( - absl::StrCat("hash '", s, "' has wrong length for base16 ", - printHashType(dest.type))); - } - memcpy(dest.hash, bytes.data(), dest.hashSize); - } - - else if (!isSRI && size == dest.base32Len()) { - for (unsigned int n = 0; n < size; ++n) { - char c = sv[size - n - 1]; - // range: -1, 0..31 - signed char digit = kUnBase32[static_cast<unsigned char>(c)]; - if (digit < 0) { - return absl::InvalidArgumentError( - absl::StrCat("invalid base-32 hash: bad character ", - absl::CEscape(absl::string_view(&c, 1)))); - } - unsigned int b = n * 5; - unsigned int i = b / 8; - unsigned int j = b % 8; - dest.hash[i] |= digit << j; - - if (i < dest.hashSize - 1) { - dest.hash[i + 1] |= digit >> (8 - j); - } else { - if ((digit >> (8 - j)) != 0) { - return absl::InvalidArgumentError( - absl::StrCat("invalid base-32 hash '", s, "'")); - } - } - } - } - - else if (isSRI || size == dest.base64Len()) { - std::string decoded; - if (!absl::Base64Unescape(sv, &decoded)) { - return absl::InvalidArgumentError("invalid base-64 hash"); - } - if (decoded.size() != dest.hashSize) { - return absl::InvalidArgumentError( - absl::StrCat("hash '", s, "' has wrong length for base64 ", - printHashType(dest.type))); - } - memcpy(dest.hash, decoded.data(), dest.hashSize); - } - - else { - return absl::InvalidArgumentError(absl::StrCat( - "hash '", s, "' has wrong length for ", printHashType(dest.type))); - } - - return dest; -} - -Hash Hash::unwrap_throw(absl::StatusOr<Hash> hash) { - if (hash.ok()) { - return *hash; - } else { - throw BadHash(hash.status().message()); - } -} - -namespace hash { - -union Ctx { - MD5_CTX md5; - SHA_CTX sha1; - SHA256_CTX sha256; - SHA512_CTX sha512; -}; - -static void start(HashType ht, Ctx& ctx) { - if (ht == htMD5) { - MD5_Init(&ctx.md5); - } else if (ht == htSHA1) { - SHA1_Init(&ctx.sha1); - } else if (ht == htSHA256) { - SHA256_Init(&ctx.sha256); - } else if (ht == htSHA512) { - SHA512_Init(&ctx.sha512); - } -} - -static void update(HashType ht, Ctx& ctx, const unsigned char* bytes, - size_t len) { - if (ht == htMD5) { - MD5_Update(&ctx.md5, bytes, len); - } else if (ht == htSHA1) { - SHA1_Update(&ctx.sha1, bytes, len); - } else if (ht == htSHA256) { - SHA256_Update(&ctx.sha256, bytes, len); - } else if (ht == htSHA512) { - SHA512_Update(&ctx.sha512, bytes, len); - } -} - -static void finish(HashType ht, Ctx& ctx, unsigned char* hash) { - if (ht == htMD5) { - MD5_Final(hash, &ctx.md5); - } else if (ht == htSHA1) { - SHA1_Final(hash, &ctx.sha1); - } else if (ht == htSHA256) { - SHA256_Final(hash, &ctx.sha256); - } else if (ht == htSHA512) { - SHA512_Final(hash, &ctx.sha512); - } -} - -} // namespace hash - -Hash hashString(HashType ht, const std::string& s) { - hash::Ctx ctx{}; - Hash hash(ht); - start(ht, ctx); - update(ht, ctx, reinterpret_cast<const unsigned char*>(s.data()), s.length()); - finish(ht, ctx, hash.hash); - return hash; -} - -Hash hashFile(HashType ht, const Path& path) { - hash::Ctx ctx{}; - Hash hash(ht); - start(ht, ctx); - - AutoCloseFD fd(open(path.c_str(), O_RDONLY | O_CLOEXEC)); - if (!fd) { - throw SysError(format("opening file '%1%'") % path); - } - - std::vector<unsigned char> buf(8192); - ssize_t n; - while ((n = read(fd.get(), buf.data(), buf.size())) != 0) { - checkInterrupt(); - if (n == -1) { - throw SysError(format("reading file '%1%'") % path); - } - update(ht, ctx, buf.data(), n); - } - - finish(ht, ctx, hash.hash); - return hash; -} - -HashSink::HashSink(HashType ht) - : ht(ht), ctx(std::make_unique<hash::Ctx>()), bytes(0) { - start(ht, *ctx); -} - -HashSink::~HashSink() { bufPos = 0; } - -void HashSink::write(const unsigned char* data, size_t len) { - bytes += len; - nix::hash::update(ht, *ctx, data, len); -} - -HashResult HashSink::finish() { - flush(); - Hash hash(ht); - nix::hash::finish(ht, *ctx, hash.hash); - return HashResult(hash, bytes); -} - -HashResult HashSink::currentHash() { - flush(); - nix::hash::Ctx ctx2 = *ctx; - Hash hash(ht); - nix::hash::finish(ht, ctx2, hash.hash); - return HashResult(hash, bytes); -} - -HashResult hashPath(HashType ht, const Path& path, PathFilter& filter) { - HashSink sink(ht); - dumpPath(path, sink, filter); - return sink.finish(); -} - -Hash compressHash(const Hash& hash, unsigned int newSize) { - Hash h; - h.hashSize = newSize; - for (unsigned int i = 0; i < hash.hashSize; ++i) { - h.hash[i % newSize] ^= hash.hash[i]; - } - return h; -} - -HashType parseHashType(const std::string& s) { - if (s == "md5") { - return htMD5; - } - if (s == "sha1") { - return htSHA1; - } else if (s == "sha256") { - return htSHA256; - } else if (s == "sha512") { - return htSHA512; - } else { - return htUnknown; - } -} - -std::string printHashType(HashType ht) { - if (ht == htMD5) { - return "md5"; - } - if (ht == htSHA1) { - return "sha1"; - } else if (ht == htSHA256) { - return "sha256"; - } else if (ht == htSHA512) { - return "sha512"; - } else if (ht == htUnknown) { - return "<unknown>"; - } else { - LOG(FATAL) << "Unrecognized hash type: " << static_cast<int>(ht); - abort(); - } -} - -} // namespace nix |