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CreateMD5SSOHash function

The CreateMD5SSOHash function obtains the default Microsoft Passport password for a specified account or realm, creates an MD5 hash from it using a specified wide-character challenge string, and returns the result as a string of hexadecimal digit bytes.


BOOL CreateMD5SSOHash(
  _In_   PWSTR pszChallengeInfo,
  _In_   PWSTR pwszRealm,
  _In_   PWSTR pwszTarget,
  _Out_  PBYTE pbHexHash


pszChallengeInfo [in]

Pointer to the wide-character challenge string to use for the MD5 hash.

pwszRealm [in]

Pointer to a string that names a realm for which to obtain the password. This parameter is ignored unless pwszTarget is NULL. If both pwszTarget and pwszRealm are NULL, the default realm is used.

pwszTarget [in]

Pointer to a string that names an account for which to obtain the password. If pwszTarget is NULL, the realm indicated by pwszRealm is used.

pbHexHash [out]

Pointer to an output buffer into which the MD5 hash is returned in hex string format. This buffer must be at least 33 bytes long.

Return value

Returns TRUE if successful, or FALSE otherwise.


Once the CreateMD5SSOHash function successfully obtains the Microsoft Passport password for the specified account or realm, it converts both the challenge string and the password from wide characters to multi-byte (generally 8-bit) characters, concatenates them, and uses the RSA library to generate an MD5 hash from the resulting key. It then converts the hash into a null-terminated string of 8-bit hexadecimal digits (using lowercase letters) which it places in the buffer pointed to by the pbHexHash parameter.

The output buffer pointed to by pbHexHash must therefore be long enough to accept two bytes for each of the 16 bytes of the hash, plus a terminating null character, for a total of 33 bytes.

Like all other aspects of the WinINet API, this function cannot be safely called from within DllMain or the constructors and destructors of global objects.

Note  WinINet does not support server implementations. In addition, it should not be used from a service. For server implementations or services use Microsoft Windows HTTP Services (WinHTTP).


Minimum supported client

Windows 2000 Professional

Minimum supported server

Windows 2000 Server







See also

Handling Authentication
WinINet Functions



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