obytes

an easy to use Obfuscated Bytes package.

Description

This simple package provide simple bytes obfuscations mechanisms.

• merge data with of a set of random bytes according to a user defined bitmask, a single byte becomes two obfuscated bytes.
• random obfuscated key, random obfuscated nonce, xchacha20+poly1305.

How the obfuscation works

"Masks" defines how random bits are distributed in each obfuscated byte. The default mask is 0x55 : [0101 0101]

The byte obfuscation transform one data byte nibble into one obfuscated byte, such that

• bits that are 0 become random bits.
• bits that are 1 become data bits.

You need a mask byte for one byte nibble of data, hence user provided masks requires a nibble high mask and nibble low mask. !IMPORTANT! you should ALWAYS make sure to have evenly distributed random/data bits in each mask.

Carefully chosen masks allows to recover your byte out of 2 obfuscated bytes.

Examples

Obfuscate bytes using default mask:

	obfuscated, err := Obfuscate(input)
	if err != nil {
		// handle error
	}
	// obfuscated is len(input)*2 and is obfuscated

	deobfuscated_input, err := Deobfuscate(obfuscated)
	if err != nil {
		// handle error
	}

Obfuscate bytes using a user defined mask:

	obfuscated, err := ObfuscateWithMask(input, 0xf0, 0x0f)
	if err != nil {
		// handle error
	}
	// obfuscated is len(input)*2 and is obfuscated

	deobfuscated_input, err := DeobfuscateWithMask(obfuscated, 0xf0, 0x0f)
	if err != nil {
		// handle error
	}

Obfuscate using an encrypted blob:

	obfuscated, err := NewBlob(input, 0x55, 0x55, 234)
	if err != nil {
		// handle error
	}
	// obfuscated is a blob of len(input)+(keysize*2)+(noncesize*2)+(aead overhead)+234
	// obfuscated is prefixed by 234 random bytes.