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// Copyright © 2020 rsiddharth <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package lib
var oracleUnknown string = `Um9sbGluJyBpbiBteSA1LjAKV2l0aCBteSByYWctdG9wIGRvd24gc28gbXkg
aGFpciBjYW4gYmxvdwpUaGUgZ2lybGllcyBvbiBzdGFuZGJ5IHdhdmluZyBq
dXN0IHRvIHNheSBoaQpEaWQgeW91IHN0b3A/IE5vLCBJIGp1c3QgZHJvdmUg
YnkK`
var oracleKey []byte
var oracleRandom []byte
func init() {
var err error
oracleKey, err = RandomBytes(16)
if err != nil {
panic(err)
}
oracleRandom, err = RandomBytes(int(RandomInt(1, 4096)))
if err != nil {
panic(err)
}
}
// Given an input `in`, this function AES encrypts `in` using a
// randomly generate 16-byte key using ECB or CBC mode and returns the
// cipher.
func OracleAESRandomEncrypt(in []byte) []byte {
// Generate random key.
key, err := RandomBytes(16)
if err != nil {
panic(err)
}
// Generate random initialization vector; needed for AES CBC.
iv, err := RandomBytes(16)
if err != nil {
panic(err)
}
// Add 5-10 bytes at the beginning and end of `in`
in = append(randomBytesWithLengthBetween(5, 10), in...)
in = append(in, randomBytesWithLengthBetween(5, 10)...)
// Randomly encrypt `in` with AES in ECB or CBC mode.
m := RandomInt(0, 1)
var out []byte
if m == 0 {
// Encrypt with AES in ECB mode.
out = AESEncryptECB(in, key)
} else {
// Encrypt with AES in CBC mode.
out = AESEncryptCBC(in, key, iv)
}
return out
}
func OracleAESEncryptECB(in []byte) []byte {
return AESEncryptECB(append(in, Base64ToBytes(oracleUnknown)...), oracleKey)
}
func OracleAESVarEncryptECB(in []byte) []byte {
in = append(oracleRandom, in...)
in = append(in, Base64ToBytes(oracleUnknown)...)
return AESEncryptECB(in, oracleKey)
}
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