mirror of
https://github.com/edgelesssys/constellation.git
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54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
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#include <openssl/sha.h>
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#include <cassert>
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#include <iomanip>
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#include <sstream>
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#include <string>
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// Use (void) to silent unused warnings.
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#define assertm(exp, msg) assert(((void)msg, exp))
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// From https://stackoverflow.com/a/2262447/7768383
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bool simpleSHA256(const void* input, unsigned long length, unsigned char* md)
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{
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SHA256_CTX context;
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if (!SHA256_Init(&context))
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return false;
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if (!SHA256_Update(&context, (unsigned char*)input, length))
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return false;
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if (!SHA256_Final(md, &context))
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return false;
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return true;
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}
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// Convert an byte array into a string
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std::string fromByteArray(const unsigned char* data, unsigned long length)
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{
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std::stringstream shastr;
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shastr << std::hex << std::setfill('0');
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for (unsigned long i = 0; i < length; ++i)
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{
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shastr << std::setw(2) << static_cast<int>(data[i]);
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}
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return shastr.str();
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}
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std::string MESSAGE = "hello world";
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std::string MESSAGE_HASH = "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9";
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int main(int argc, char* argv[])
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{
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unsigned char md[SHA256_DIGEST_LENGTH] = {};
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assertm(simpleSHA256(static_cast<const void*>(MESSAGE.data()), MESSAGE.size(), md), "Failed to generate hash");
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std::string hash = fromByteArray(md, SHA256_DIGEST_LENGTH);
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assertm(hash == MESSAGE_HASH, "Unexpected message hash");
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return 0;
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}
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