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authorTiger Wang <ziwei.tiger@hotmail.co.uk>2014-05-04 15:15:10 +0200
committerTiger Wang <ziwei.tiger@hotmail.co.uk>2014-05-04 15:15:10 +0200
commit0d1804e439ec0028be4d5380e66c13481781fc57 (patch)
tree95d4c3ab397568f36832cf27cf98c351e9d22e4d /src/PolarSSL++/Sha1Checksum.cpp
parentFixed lever and button powering direction (diff)
parentFixed pressure plate oversights (diff)
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Diffstat (limited to 'src/PolarSSL++/Sha1Checksum.cpp')
-rw-r--r--src/PolarSSL++/Sha1Checksum.cpp138
1 files changed, 138 insertions, 0 deletions
diff --git a/src/PolarSSL++/Sha1Checksum.cpp b/src/PolarSSL++/Sha1Checksum.cpp
new file mode 100644
index 000000000..a1ee9d7b9
--- /dev/null
+++ b/src/PolarSSL++/Sha1Checksum.cpp
@@ -0,0 +1,138 @@
+
+// Sha1Checksum.cpp
+
+// Declares the cSha1Checksum class representing the SHA-1 checksum calculator
+
+#include "Globals.h"
+#include "Sha1Checksum.h"
+
+
+
+
+
+/*
+// Self-test the hash formatting for known values:
+// sha1(Notch) : 4ed1f46bbe04bc756bcb17c0c7ce3e4632f06a48
+// sha1(jeb_) : -7c9d5b0044c130109a5d7b5fb5c317c02b4e28c1
+// sha1(simon) : 88e16a1019277b15d58faf0541e11910eb756f6
+
+static class Test
+{
+public:
+ Test(void)
+ {
+ AString DigestNotch, DigestJeb, DigestSimon;
+ Byte Digest[20];
+ cSha1Checksum Checksum;
+ Checksum.Update((const Byte *)"Notch", 5);
+ Checksum.Finalize(Digest);
+ cSha1Checksum::DigestToJava(Digest, DigestNotch);
+ Checksum.Restart();
+ Checksum.Update((const Byte *)"jeb_", 4);
+ Checksum.Finalize(Digest);
+ cSha1Checksum::DigestToJava(Digest, DigestJeb);
+ Checksum.Restart();
+ Checksum.Update((const Byte *)"simon", 5);
+ Checksum.Finalize(Digest);
+ cSha1Checksum::DigestToJava(Digest, DigestSimon);
+ printf("Notch: \"%s\"\n", DigestNotch.c_str());
+ printf("jeb_: \"%s\"\n", DigestJeb.c_str());
+ printf("simon: \"%s\"\n", DigestSimon.c_str());
+ assert(DigestNotch == "4ed1f46bbe04bc756bcb17c0c7ce3e4632f06a48");
+ assert(DigestJeb == "-7c9d5b0044c130109a5d7b5fb5c317c02b4e28c1");
+ assert(DigestSimon == "88e16a1019277b15d58faf0541e11910eb756f6");
+ }
+} test;
+*/
+
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSha1Checksum:
+
+cSha1Checksum::cSha1Checksum(void) :
+ m_DoesAcceptInput(true)
+{
+ sha1_starts(&m_Sha1);
+}
+
+
+
+
+
+void cSha1Checksum::Update(const Byte * a_Data, size_t a_Length)
+{
+ ASSERT(m_DoesAcceptInput); // Not Finalize()-d yet, or Restart()-ed
+
+ sha1_update(&m_Sha1, a_Data, a_Length);
+}
+
+
+
+
+
+void cSha1Checksum::Finalize(cSha1Checksum::Checksum & a_Output)
+{
+ ASSERT(m_DoesAcceptInput); // Not Finalize()-d yet, or Restart()-ed
+
+ sha1_finish(&m_Sha1, a_Output);
+ m_DoesAcceptInput = false;
+}
+
+
+
+
+
+void cSha1Checksum::DigestToJava(const Checksum & a_Digest, AString & a_Out)
+{
+ Checksum Digest;
+ memcpy(Digest, a_Digest, sizeof(Digest));
+
+ bool IsNegative = (Digest[0] >= 0x80);
+ if (IsNegative)
+ {
+ // Two's complement:
+ bool carry = true; // Add one to the whole number
+ for (int i = 19; i >= 0; i--)
+ {
+ Digest[i] = ~Digest[i];
+ if (carry)
+ {
+ carry = (Digest[i] == 0xff);
+ Digest[i]++;
+ }
+ }
+ }
+ a_Out.clear();
+ a_Out.reserve(40);
+ for (int i = 0; i < 20; i++)
+ {
+ AppendPrintf(a_Out, "%02x", Digest[i]);
+ }
+ while ((a_Out.length() > 0) && (a_Out[0] == '0'))
+ {
+ a_Out.erase(0, 1);
+ }
+ if (IsNegative)
+ {
+ a_Out.insert(0, "-");
+ }
+}
+
+
+
+
+
+
+void cSha1Checksum::Restart(void)
+{
+ sha1_starts(&m_Sha1);
+ m_DoesAcceptInput = true;
+}
+
+
+
+