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This loop is really quite simple. It reads each character from the string and checks whether its zero. If it s not it loops on to the next character. When the loop is completed, EAX points to the string s terminating NULL character, and ESI points to the second character in the string. The following instruction produces the final result.

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Here the pointer to the second character is subtracted from the pointer to the NULL terminator. The result is effectively the length of the string, not including the NULL terminator (because ESI was holding the address to the second character, not the first). This sequence is essentially equivalent to the strlen C runtime library function. You might wonder why the program would implement its own strlen function instead of just calling the runtime library. The answer is that it probably is calling the runtime library, but the compiler is replacing the call with an intrinsic implementation. Some compilers support intrinsic implementations of popular functions, which basically means that the compiler replaces the function call with an actual implementation of the function that is placed inside the calling function. This improves performance because it avoids the overhead of performing a function call. After measuring the length of the string, the function proceeds to hash the password string using CryptHashData and to extract the resulting hash using CryptGetHashParam. The resulting hash value is then passed on to 00402280, which is the function we investigated in Listing 6.4. This is curious because as we know the function in Listing 6.4 is going to hash that data again, this time using the MD5 algorithm. What is the point of rehashing the output

of one hashing algorithm with another hashing algorithm That is not clear at the moment After the MD5 function returns (and assuming it returns a nonzero value), the function proceeds to call an interesting API called CryptDeriveKey According to Microsoft s documentation, CryptDeriveKey generates cryptographic session keys derived from a base data value The base data value is taken for a hash object, which, in this case, is a 160-bit SHA hash calculated from the plaintext password As a part of the generation of the key object, the caller must also specify which encryption algorithm will be used (this is specified in the second parameter passed to CryptDeriveKey) As you can see in Listing 65, Cryptex is passing 0x6603 We return to WinCryptH and discover that 0x6603 stands for CALG_3DES This makes sense and proves that Cryptex works as advertised: It encrypts data using the 3DES algorithm.

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When we think about it a little bit, it becomes clear why Cryptex calculated that extra MD5 hash Essentially, Cryptex is using the generated SHA hash as a key for encrypting and decrypting the data (3DES is a symmetric algorithm, which means that encryption and decryption are both performed using the same key) Additionally, Cryptex needs some kind of an easy way to detect whether the supplied password was correct or incorrect For this, Cryptex calculates an additional hash (using the MD5 algorithm) from the SHA hash and stores the result in the file header When an archive is opened, the supplied password is hashed twice (once using SHA and once using MD5), and the MD5 result is compared against the one stored in the archive header If they match, the password is correct.

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You may wonder why Cryptex isn t just storing the SHA result directly into the file header Why go through the extra effort of calculating an additional hash value The reason is that the SHA hash is directly used as the encryption key; storing it in the file header would make it incredibly easy to decrypt Cryptex archives This might be a bit confusing considering that it is impossible to extract the original plaintext password from the SHA hash value, but it is just not needed The hash value is all that would be needed in order to decrypt the data Instead, Cryptex calculates an additional hash from the SHA value and stores that as the unique password identification Figure 61 demonstrates this sequence.

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