什么是解密由此php片段加密的文本的openssl命令行？

What is the openssl command line for decrypting text encrypted using the following php code?

function encrypt($text, $key) {
    return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}

This is how far I got:

"blah blah" encrypted with "password" becomes:

whSklKP6+wJdbGpiaCavFp8BiaZ6B1LZmJ0d7Nqx2nc=

I try and decrypt this with:

openssl base64 -d -in test.b64 > test.bin
openssl enc -d -aes-256-ecb -pass pass:password -in test.bin -out test.txt

And I get:

bad magic number