Getting different MD5 hashes in cryptoAPI and java messageDigest
Hi,
I am writing a java application to produce a hash value for a string
which should give me the same hash value as a c++ code which uses CryptoAPI.
I am including code snippets of the c++ and the java codes...Plese tell me
if the reason i am getting different hash values is because the java code is
using a different provider. If so where do i get the provider and how do i use it
in this code.
try
{
if (0==::CryptAcquireContext(&hProv,NULL,MS_DEF_PROV, PROV_RSA_FULL,CRYPT_MACHINE_KEYSET))
{
//throwing exception
}
// Create the hash object...
if (0==::CryptCreateHash(hProv,CALG_MD5,0,0,&hHash))
{
//throwing exception
}
// Actually hash the data
if (0==::CryptHashData(hHash,reinterpret_cast<CONST BYTE *>(bsData),::SysStringByteLen(bsData),0))
{
//throwing exception
}
// Extract the actual hash value from the hash object
// But first get the buffer size required to store the same...
if (0==::CryptGetHashParam(hHash,HP_HASHVAL,NULL,&dwLen,0))
{
//throwing exception
}
// Try allocating memory for the buffer...
pBuffer=static_cast<BYTE *>(::malloc(dwLen));
if (NULL==pBuffer)
{
//throwing exception
}
memset(pBuffer,'\0',sizeof(pBuffer));
// Now extract the hash value into this buffer
if (0==::CryptGetHashParam(hHash,HP_HASHVAL,pBuffer,&dwLen,0))
{
//throwing exception
}
// Capture the hash value into a BSTR
::SysFreeString(*pbsHashValue);
*pbsHashValue=NULL;
// Allocate the new string
*pbsHashValue=::SysAllocStringLen((unsignedshort *)pBuffer,dwLen/2);
if (NULL==*pbsHashValue)
{
//throwing exception
}
}catch(char *e){
//cleanup and show error if any.
}
The hash i get for "srikanth" is "b*.DB宕ξ.遫铀.." or
" 98 42 46 68 66 229 180 166 206 46 223 111 211 203 46 46 0"
The java Code:
{
MessageDigest messageDigest;
byte []l_bytes=null;
String p_password ="srikanth";
try{
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.update(p_password.getBytes (),0,p_password.length ());
l_bytes= messageDigest.digest();
BigInteger hash =new BigInteger( 1, l_bytes );
System.out.println("hash :"+hash);
String hpassword = hash.toString( 16 );
System.out.println(hpassword);
}catch(NoSuchAlgorithmException e){
System.out.println("No Such Algorithm Exception");
return;
}
}
and output here is :
hash :98295845500620623440969102971712815427
49f3175a93cd22f5e345bca772f7c143
Please let me know where am i going wrong.
Thanks,
Srik.
