From 79de3008ebfc6b4a5dd32e9de1d19788da0b885d Mon Sep 17 00:00:00 2001
From: Julian Andres Klode <julian.klode@canonical.com>
Date: Tue, 7 Jan 2020 20:36:53 +0100
Subject: Convert users of {MD5,SHA1,SHA256,SHA512}Summation to use Hashes

This makes use of the a function GetHashString() that returns
the specific hash string. We also need to implement another overload
of Add() for signed chars with sizes, so the existing users do not
require reinterpret_cast everywhere.
---
 apt-pkg/contrib/cdromutl.cc |  6 +++---
 apt-pkg/contrib/hashes.cc   | 25 +++++++++++++++++--------
 apt-pkg/contrib/hashes.h    |  7 +++++++
 3 files changed, 27 insertions(+), 11 deletions(-)

(limited to 'apt-pkg/contrib')

diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc
index 9db3980da..c0fe869d2 100644
--- a/apt-pkg/contrib/cdromutl.cc
+++ b/apt-pkg/contrib/cdromutl.cc
@@ -15,7 +15,7 @@
 #include <apt-pkg/configuration.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/fileutl.h>
-#include <apt-pkg/md5.h>
+#include <apt-pkg/hashes.h>
 #include <apt-pkg/strutl.h>
 
 #include <iostream>
@@ -181,7 +181,7 @@ bool MountCdrom(string Path, string DeviceName)
    from effecting the outcome. */
 bool IdentCdrom(string CD,string &Res,unsigned int Version)
 {
-   MD5Summation Hash;
+   Hashes Hash(Hashes::MD5SUM);
    bool writable_media = false;
 
    int dirfd = open(CD.c_str(), O_RDONLY | O_DIRECTORY | O_CLOEXEC);
@@ -254,7 +254,7 @@ bool IdentCdrom(string CD,string &Res,unsigned int Version)
       strprintf(S, "-%u.debug", Version);
 
    closedir(D);
-   Res = Hash.Result().Value().append(std::move(S));
+   Res = Hash.GetHashString(Hashes::MD5SUM).HashValue().append(std::move(S));
    return true;
 }
 									/*}}}*/
diff --git a/apt-pkg/contrib/hashes.cc b/apt-pkg/contrib/hashes.cc
index 8ddaaf549..d506a1361 100644
--- a/apt-pkg/contrib/hashes.cc
+++ b/apt-pkg/contrib/hashes.cc
@@ -102,27 +102,27 @@ std::string HashString::GetHashForFile(std::string filename) const      /*{{{*/
    FileFd Fd(filename, FileFd::ReadOnly);
    if(strcasecmp(Type.c_str(), "MD5Sum") == 0)
    {
-      MD5Summation MD5;
+      Hashes MD5(Hashes::MD5SUM);
       MD5.AddFD(Fd);
-      fileHash = (std::string)MD5.Result();
+      fileHash = MD5.GetHashString(Hashes::MD5SUM).Hash;
    }
    else if (strcasecmp(Type.c_str(), "SHA1") == 0)
    {
-      SHA1Summation SHA1;
+      Hashes SHA1(Hashes::SHA1SUM);
       SHA1.AddFD(Fd);
-      fileHash = (std::string)SHA1.Result();
+      fileHash = SHA1.GetHashString(Hashes::SHA1SUM).Hash;
    }
    else if (strcasecmp(Type.c_str(), "SHA256") == 0)
    {
-      SHA256Summation SHA256;
+      Hashes SHA256(Hashes::SHA256SUM);
       SHA256.AddFD(Fd);
-      fileHash = (std::string)SHA256.Result();
+      fileHash = SHA256.GetHashString(Hashes::SHA256SUM).Hash;
    }
    else if (strcasecmp(Type.c_str(), "SHA512") == 0)
    {
-      SHA512Summation SHA512;
+      Hashes SHA512(Hashes::SHA512SUM);
       SHA512.AddFD(Fd);
-      fileHash = (std::string)SHA512.Result();
+      fileHash = SHA512.GetHashString(Hashes::SHA512SUM).Hash;
    }
    else if (strcasecmp(Type.c_str(), "Checksum-FileSize") == 0)
       strprintf(fileHash, "%llu", Fd.FileSize());
@@ -413,6 +413,15 @@ HashStringList Hashes::GetHashStringList()
 
    return hashes;
 }
+
+HashString Hashes::GetHashString(SupportedHashes hash)
+{
+   for (auto & Algo : Algorithms)
+      if (hash == Algo.ourAlgo)
+	 return HashString(Algo.name, HexDigest(d->hd, Algo.gcryAlgo));
+
+   abort();
+}
 Hashes::Hashes() : d(new PrivateHashes(~0)) { }
 Hashes::Hashes(unsigned int const Hashes) : d(new PrivateHashes(Hashes)) {}
 Hashes::Hashes(HashStringList const &Hashes) : d(new PrivateHashes(Hashes)) {}
diff --git a/apt-pkg/contrib/hashes.h b/apt-pkg/contrib/hashes.h
index 14100e13b..07ccc6900 100644
--- a/apt-pkg/contrib/hashes.h
+++ b/apt-pkg/contrib/hashes.h
@@ -184,6 +184,10 @@ class Hashes
    bool Add(const unsigned char * const Data, unsigned long long const Size) APT_NONNULL(2);
    inline bool Add(const char * const Data) APT_NONNULL(2)
    {return Add(reinterpret_cast<unsigned char const *>(Data),strlen(Data));};
+   inline bool Add(const char *const Data, unsigned long long const Size) APT_NONNULL(2)
+   {
+      return Add(reinterpret_cast<unsigned char const *>(Data), Size);
+   };
    inline bool Add(const unsigned char * const Beg,const unsigned char * const End) APT_NONNULL(2,3)
    {return Add(Beg,End-Beg);};
 
@@ -194,6 +198,9 @@ class Hashes
 
    HashStringList GetHashStringList();
 
+   /** Get a specific hash. It is an error to use a hash that was not hashes */
+   HashString GetHashString(SupportedHashes hash);
+
    /** create a Hashes object to calculate all supported hashes
     *
     * If ALL is too much, you can limit which Hashes are calculated
-- 
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