44 lines
1.0 KiB
Go
44 lines
1.0 KiB
Go
package crypt
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import (
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"bytes"
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"crypto/aes"
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)
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func PKCS7PaddingEx(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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func PKCS7UnPaddingEx(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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return origData[:(length - unpadding)]
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}
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func EcbDecrypt(data, key []byte) []byte {
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block, _ := aes.NewCipher(key)
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decrypted := make([]byte, len(data))
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size := block.BlockSize()
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for bs, be := 0, size; bs < len(data); bs, be = bs+size, be+size {
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block.Decrypt(decrypted[bs:be], data[bs:be])
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}
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return PKCS7UnPaddingEx(decrypted)
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}
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func EcbEncrypt(data, key []byte) []byte {
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block, _ := aes.NewCipher(key)
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data = PKCS7PaddingEx(data, block.BlockSize())
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decrypted := make([]byte, len(data))
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size := block.BlockSize()
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for bs, be := 0, size; bs < len(data); bs, be = bs+size, be+size {
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block.Encrypt(decrypted[bs:be], data[bs:be])
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}
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return decrypted
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}
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