string GPWriter::constructRandomStr() {
int randomDevice = ::open("/dev/urandom", O_RDONLY);
char randomData[32];
size_t randomDataLen = 0;
S3_CHECK_OR_DIE(randomDevice >= 0, S3RuntimeError, "failed to generate random number");
while (randomDataLen < sizeof(randomData)) {
ssize_t result =
::read(randomDevice, randomData + randomDataLen, sizeof(randomData) - randomDataLen);
if (result < 0) {
break;
}
randomDataLen += result;
}
::close(randomDevice);
char out_hash_hex[SHA256_DIGEST_STRING_LENGTH];
sha256_hex(randomData, 32, out_hash_hex);
return out_hash_hex + SHA256_DIGEST_STRING_LENGTH - 8 - 1;
}
TEST(Utils, sha256) {
char hash_str[65] = {0};
EXPECT_TRUE(sha256_hex(TEST_STRING, hash_str));
EXPECT_STREQ("d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592", hash_str);
}
