49 lines
996 B
Go
49 lines
996 B
Go
package lnurl
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"io"
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)
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func AESCipher(key, plaintext []byte) (ciphertext []byte, iv []byte, err error) {
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pad := aes.BlockSize - (len(plaintext) % aes.BlockSize)
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padding := make([]byte, pad)
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for i := 0; i < pad; i++ {
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padding[i] = byte(pad)
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}
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plaintext = append(plaintext, padding...)
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block, err := aes.NewCipher(key)
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if err != nil {
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return
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}
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ciphertext = make([]byte, len(plaintext))
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iv = make([]byte, aes.BlockSize)
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if _, err = io.ReadFull(rand.Reader, iv); err != nil {
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return
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}
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cbc := cipher.NewCBCEncrypter(block, iv)
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cbc.CryptBlocks(ciphertext, plaintext)
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return
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}
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func AESDecipher(key, ciphertext, iv []byte) (plaintext []byte, err error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(ciphertext, ciphertext)
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size := len(ciphertext)
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pad := ciphertext[size-1]
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plaintext = ciphertext[:size-int(pad)]
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return plaintext, nil
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}
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