Use sha512 to calcualte the versionID for images.
- We needed a hash algorithm that can be replicated on
multiple platforms and across multiple programming languages.
- This would allow the user to calculate the versionID by
executing the following command to obtain correct versionID.
echo -n "<versionID>" | sha512sum | cut -b 1-8
- This is part of the change required for openbmc/openbmc#2323
Change-Id: I799a9a2b83fdf35beaf61b9df5ed69162f610d2f
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/version.cpp b/version.cpp
index 013cc68..8e36071 100644
--- a/version.cpp
+++ b/version.cpp
@@ -8,6 +8,7 @@
#include <phosphor-logging/elog-errors.hpp>
#include "xyz/openbmc_project/Common/error.hpp"
#include "item_updater.hpp"
+#include <openssl/sha.h>
namespace openpower
{
@@ -22,7 +23,6 @@
std::string Version::getId(const std::string& version)
{
- std::stringstream hexId;
if (version.empty())
{
@@ -31,10 +31,20 @@
Argument::ARGUMENT_VALUE(version.c_str()));
}
- // Only want 8 hex digits.
- hexId << std::hex << ((std::hash<std::string> {}(
- version)) & 0xFFFFFFFF);
- return hexId.str();
+ unsigned char digest[SHA512_DIGEST_LENGTH];
+ SHA512_CTX ctx;
+ SHA512_Init(&ctx);
+ SHA512_Update(&ctx, version.c_str(), strlen(version.c_str()));
+ SHA512_Final(digest, &ctx);
+ char mdString[SHA512_DIGEST_LENGTH*2+1];
+ for (int i = 0; i < SHA512_DIGEST_LENGTH; i++)
+ {
+ snprintf(&mdString[i*2], 3, "%02x", (unsigned int)digest[i]);
+ }
+
+ // Only need 8 hex digits.
+ std::string hexId = std::string(mdString);
+ return (hexId.substr(0, 8));
}
std::map<std::string, std::string> Version::getValue(