The concept is pretty simple actually, and involves finding out the hash function from known input and output.
Is there a tool (I'm on linux) that can find out this information quickly?
Example:
secret - fc683cd9ed1990ca2ea10b84e5e6fba048c24929
Knowing the two values above, this hypothetical machine would print out sha1sum.
And excuse my beginner mindset, I'm new and learning about this topic in my free time.
Assuming that an input string X is guaranteed to produce output hash Y, you can build a program which makes use of each encoding type.
Pseudocode:
hash = "fc683cd9ed1990ca2ea10b84e5e6fba048c24929";
input = "secret"
if (md5(input) == hash)
return "md5";
else if (sha1(input) == hash)
return "sha1";
//etc...
else
return "Unknown"
Edit: See How come MD5 hash values are not reversible? for more information on why you can't "reverse" a hash such as md5.
Edit 2: I did some searches and found this: http://code.google.com/p/hash-identifier/ - It looks pretty comprehensive, so take a look.
Domain Cached Credentials - MD4(MD4(($pass)).(strtolower($username))) I can't comprehend this one.
Here is an expanded example...
import hashlib
import bcrypt
import argon2_cffi
def check_hash(input, hash):
# Calculate the MD5 hash
md5_hash = hashlib.md5(input.encode()).hexdigest()
# Calculate the SHA-1 hash
sha1_hash = hashlib.sha1(input.encode()).hexdigest()
# Calculate the SHA-256 hash
sha256_hash = hashlib.sha256(input.encode()).hexdigest()
# Calculate the SHA-512 hash
sha512_hash = hashlib.sha512(input.encode()).hexdigest()
# Compare with bcrypt hash
if bcrypt.checkpw(input.encode(), hash.encode()):
return "bcrypt"
# Compare with Argon2 hash
argon2 = argon2_cffi.PasswordHasher()
try:
argon2.verify(hash, input)
return "argon2"
except argon2_cffi.exceptions.VerifyMismatchError:
pass
if md5_hash == hash:
return "md5"
elif sha1_hash == hash:
return "sha1"
elif sha256_hash == hash:
return "sha256"
elif sha512_hash == hash:
return "sha512"
else:
return "Unknown"
# Example usage
hash = "fc683cd9ed1990ca2ea10b84e5e6fba048c24929"
input = "secret"
result = check_hash(input, hash)
print(f"Hash Algorithm: {result}")
