add sha512 interface based on sha2 by aaron gifford

1 files changed, 128 insertions, 0 deletions

diff --git a/apt-pkg/contrib/sha512.cc b/apt-pkg/contrib/sha512.cc
new file mode 100644
index 000000000..752e039a7
--- /dev/null
+++ b/apt-pkg/contrib/sha512.cc
@@ -0,0 +1,128 @@
+/*
+ * Cryptographic API.							{{{
+ *
+ * SHA-512, as specified in
+ * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ */									/*}}}*/
+
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/sha512.h"
+#endif
+
+#include <apt-pkg/sha512.h>
+#include <apt-pkg/sha2.h>
+#include <apt-pkg/strutl.h>
+
+SHA512Summation::SHA512Summation()					/*{{{*/
+{
+   SHA512_Init(&ctx);
+   Done = false;
+}
+									/*}}}*/
+bool SHA512Summation::Add(const unsigned char *inbuf,unsigned long len) /*{{{*/
+{
+   if (Done) 
+      return false;
+   SHA512_Update(&ctx, inbuf, len);
+   return true;
+}
+									/*}}}*/
+SHA512SumValue SHA512Summation::Result()				/*{{{*/
+{
+   if (!Done) {
+      SHA512_Final(Sum, &ctx);
+      Done = true;
+   }
+
+   SHA512SumValue res;
+   res.Set(Sum);
+   return res;
+}
+									/*}}}*/
+// SHA512SumValue::SHA512SumValue - Constructs the sum from a string   /*{{{*/
+// ---------------------------------------------------------------------
+/* The string form of a SHA512 is a 64 character hex number */
+SHA512SumValue::SHA512SumValue(string Str)
+{
+   memset(Sum,0,sizeof(Sum));
+   Set(Str);
+}
+                                                                       /*}}}*/
+// SHA512SumValue::SHA512SumValue - Default constructor                /*{{{*/
+// ---------------------------------------------------------------------
+/* Sets the value to 0 */
+SHA512SumValue::SHA512SumValue()
+{
+   memset(Sum,0,sizeof(Sum));
+}
+                                                                       /*}}}*/
+// SHA512SumValue::Set - Set the sum from a string                     /*{{{*/
+// ---------------------------------------------------------------------
+/* Converts the hex string into a set of chars */
+bool SHA512SumValue::Set(string Str)
+{
+   return Hex2Num(Str,Sum,sizeof(Sum));
+}
+                                                                       /*}}}*/
+// SHA512SumValue::Value - Convert the number into a string            /*{{{*/
+// ---------------------------------------------------------------------
+/* Converts the set of chars into a hex string in lower case */
+string SHA512SumValue::Value() const
+{
+   char Conv[16] =
+      { '0','1','2','3','4','5','6','7','8','9','a','b',
+      'c','d','e','f'
+   };
+   char Result[129];
+   Result[128] = 0;
+
+   // Convert each char into two letters
+   int J = 0;
+   int I = 0;
+   for (; I != 128; J++,I += 2)
+   {
+      Result[I] = Conv[Sum[J] >> 4];
+      Result[I + 1] = Conv[Sum[J] & 0xF];
+   }
+
+   return string(Result);
+}
+									/*}}}*/
+// SHA512SumValue::operator == - Comparator                            /*{{{*/
+// ---------------------------------------------------------------------
+/* Call memcmp on the buffer */
+bool SHA512SumValue::operator == (const SHA512SumValue & rhs) const
+{
+   return memcmp(Sum,rhs.Sum,sizeof(Sum)) == 0;
+}
+                                                                       /*}}}*/
+// SHA512Summation::AddFD - Add content of file into the checksum      /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool SHA512Summation::AddFD(int Fd,unsigned long Size)
+{
+   unsigned char Buf[64 * 64];
+   int Res = 0;
+   int ToEOF = (Size == 0);
+   while (Size != 0 || ToEOF)
+   {
+      unsigned n = sizeof(Buf);
+      if (!ToEOF) n = min(Size,(unsigned long)n);
+      Res = read(Fd,Buf,n);
+      if (Res < 0 || (!ToEOF && (unsigned) Res != n)) // error, or short read
+         return false;
+      if (ToEOF && Res == 0) // EOF
+         break;
+      Size -= Res;
+      Add(Buf,Res);
+   }
+   return true;
+}
+                                                                       /*}}}*/
+