Random production of corrupt ciphertext

[gmaiainc]

The package appears to have a bug where it will randomly produce a ciphertext it cannot decipher. This is easily reproducible with the following Go program, largely based on the example in the Readme:

package main

import (
	"log"

	ecies "github.com/ecies/go/v2"
)

func main() {
	k, err := ecies.GenerateKey()
	if err != nil {
		panic(err)
	}
	log.Println("key pair has been generated")

	for {
		ciphertext, err := ecies.Encrypt(k.PublicKey, []byte("THIS IS THE TEST"))
		if err != nil {
			panic(err)
		}

		_, err = ecies.Decrypt(k, ciphertext)
		if err != nil {
			panic(err)
		}
	}
}

The expectation is that this program loops forever, however, what actually happens is that after a certain number of iterations (usually in the order of a few thousand), Decrypt will fail with an error: "invalid public key". This is because the Encrypt function is rarely producing a ciphertext that does not appear to be valid.