Initial

README.md

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+# b64mute - Base64 Mutator
+
+This program applies simple mutations to base64 encoded strings for obfuscation purposes. It applies an uneven chunk approach to concatenate arbitrary chunks with padding.
+
+For more info read [this writeup](https://n0.lol/encmute/)!
+
+[Duck Duck Go](https://duckduckgo.com)
+## Usage ##
+
+Generate a mutation from a string
+
+    $ python3 b64mute.py -d "netspooky"
+    bmU=dHNwb28=a3k=
+
+Generate a mutation on a file:
+
+    $ python3 b64mute.py -f test.txt
+    aA==dHQ=cHM6Ly90d2k=dHRlcg==Lg==Y28=bS8=bg==ZQ==dA==c3Bvb2t5
+
+Save the output to a file:
+
+    $ python3 b64mute.py -d "admin:hunter2" -o out.txt
+
+Test your string:
+
+    $ base64 -d <<< "bmU=dHNwb28=a3k="
+    netspooky
+

b64mute.py

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+import base64
+import argparse
+from random import randrange
+
+parser = argparse.ArgumentParser(description='Base64 Mutator')
+parser.add_argument('-d', dest='indata', help='Input data (string)')
+parser.add_argument('-f', dest='infile', help='Input file')
+parser.add_argument('-o', dest='outfile', help='Output file')
+
+def doEncode(mBytes):
+    b64Bytes = base64.b64encode(mBytes)
+    return b64Bytes
+
+def openFile(filename):
+    with open(filename, "rb") as f:
+        fileobj = f.read()
+    return fileobj
+
+if __name__ == '__main__':
+    args    = parser.parse_args()
+    indata  = args.indata
+    infile  = args.infile
+    outfile = args.outfile
+
+    outmsg = b'' # This will hold the base64 object
+
+    if indata:
+        data2enc = indata
+        data2enc_bytes = data2enc.encode('utf-8') # Convert to bytes object
+    elif infile:
+        data2enc = openFile(infile)
+        data2enc_bytes = data2enc # It's already a bytes object here
+
+    msgLen = len(data2enc_bytes)
+    x = 0
+    while x < msgLen:
+        chunkSize = randrange(1,4)
+        outmsg += doEncode(data2enc_bytes[x:x+chunkSize])
+        x = x + chunkSize
+    if outfile: # We write to file 
+        f = open(outfile, 'wb')
+        f.write(outmsg)
+        f.close()
+    else: # Otherwise write to stdout
+        b64Enc = outmsg.decode('utf-8')
+        print("{}".format(b64Enc))
+