InvalidEntropyException

Exception thrown when entropy has invalid size or format.

BIP-39 requires entropy to be a multiple of 32 bits (4 bytes) with a size between 128 and 256 bits (16 to 32 bytes). Valid entropy sizes:

• 128 bits (16 bytes) -> 12 word mnemonic

• 160 bits (20 bytes) -> 15 word mnemonic

• 192 bits (24 bytes) -> 18 word mnemonic

• 224 bits (28 bytes) -> 21 word mnemonic

• 256 bits (32 bytes) -> 24 word mnemonic

Common causes:

• Entropy size not a multiple of 4 bytes

• Entropy too small (less than 16 bytes)

• Entropy too large (more than 32 bytes)

• Entropy is null or empty

Example:

try {
    val mnemonic = Mnemonic.fromEntropy(byteArrayOf(1, 2, 3)) // Too small
} catch (e: InvalidEntropyException) {
    println("Invalid entropy: ${e.message}")
}

See also:

• Sep05Exception base class

Parameters