windows equivalent of this bash command that uses /dev/urandom

Is there a simple Windows equivalent for this bash comman开发者_StackOverflow社区d:

head -c 500 /dev/urandom | tr -dc abcdefghijklmnopqrstuvwxyz | head -c 9; echo

I think the main problem is /dev/urandom, since I've heard of the CryptoAPI, but I don't know if that's cryptographically secure enough.

EDIT: Sorry, the code is used in a php script, and the %s represents a string substitution; I forgot to make that substitution when I asked the question. Fixed.

Taken from RFC 4086:

7.1.3. Windows CryptGenRandom

Microsoft's recommendation to users of the widely deployed Windows operating system is generally to use the CryptGenRandom pseudo-random number generation call with the CryptAPI cryptographic service provider. This takes a handle to a cryptographic service provider library, a pointer to a buffer by which the caller can provide entropy and into which the generated pseudo-randomness is returned, and an indication of how many octets of randomness are desired.

The Windows CryptAPI cryptographic service provider stores a seed state variable with every user. When CryptGenRandom is called, this is combined with any randomness provided in the call and with various system and user data such as the process ID, thread ID, system clock, system time, system counter, memory status, free disk clusters, and hashed user environment block. This data is all fed to SHA-1, and the output is used to seed an RC4 key stream. That key stream is used to produce the pseudo-random data requested and to update the user's seed state variable.

Users of Windows ".NET" will probably find it easier to use the RNGCryptoServiceProvider.GetBytes method interface.