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/hashes.cc | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

(limited to 'apt-pkg/contrib/hashes.cc')

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)) {}
-- 
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