93 lines
1.8 KiB
Go
Executable file
93 lines
1.8 KiB
Go
Executable file
package aes
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import (
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"crypto/aes"
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"crypto/cipher"
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)
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// AESEncrypt encrypts the key with the given source.
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func Encrypt(src, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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ecb := newECBEncrypter(block)
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out := make([]byte, len(src))
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ecb.CryptBlocks(out, src)
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return out, nil
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}
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// AESDecrypt decrypts the encrypted source with the given key.
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func Decrypt(crypted, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockMode := newECBDecrypter(block)
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out := make([]byte, len(crypted))
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blockMode.CryptBlocks(out, crypted)
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return out, nil
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}
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type ecb struct {
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b cipher.Block
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blockSize int
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}
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func newECB(b cipher.Block) *ecb {
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return &ecb{
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b: b,
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blockSize: b.BlockSize(),
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}
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}
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type ecbEncrypter ecb
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func newECBEncrypter(b cipher.Block) cipher.BlockMode {
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return (*ecbEncrypter)(newECB(b))
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}
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func (ecb *ecbEncrypter) BlockSize() int {
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return ecb.blockSize
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}
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func (ecb *ecbEncrypter) CryptBlocks(dst, src []byte) {
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if len(src)%ecb.blockSize != 0 {
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panic("crypto/cipher: input not full blocks")
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}
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if len(dst) < len(src) {
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panic("crypto/cipher: output smaller than input")
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}
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for len(src) > 0 {
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ecb.b.Encrypt(dst, src[:ecb.blockSize])
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src = src[ecb.blockSize:]
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dst = dst[ecb.blockSize:]
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}
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}
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type ecbDecrypter ecb
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func newECBDecrypter(b cipher.Block) cipher.BlockMode {
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return (*ecbDecrypter)(newECB(b))
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}
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func (ecb ecbDecrypter) BlockSize() int {
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return ecb.blockSize
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}
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func (ecb *ecbDecrypter) CryptBlocks(dst, src []byte) {
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if len(src)%ecb.blockSize != 0 {
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panic("crypto/cipher: input not full blocks")
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}
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if len(dst) < len(src) {
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panic("crypto/cipher: output smaller than input")
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}
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for len(src) > 0 {
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ecb.b.Decrypt(dst, src[:ecb.blockSize])
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src = src[ecb.blockSize:]
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dst = dst[ecb.blockSize:]
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}
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}
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