34 lines
744 B
Go
34 lines
744 B
Go
package crypto
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import "crypto/aes"
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// PKCS7UnPadding removes PKCS#7 padding.
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func PKCS7UnPadding(encrypt []byte) []byte {
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length := len(encrypt)
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if length == 0 {
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return encrypt
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}
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unPadding := int(encrypt[length-1])
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if unPadding <= 0 || unPadding > length {
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return encrypt
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}
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return encrypt[:length-unPadding]
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}
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// DecryptAES128ECB decrypts data with AES-128 ECB (block size 16).
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func DecryptAES128ECB(data, key []byte) []byte {
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cipher, err := aes.NewCipher(key)
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if err != nil {
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return nil
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}
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decrypted := make([]byte, len(data))
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size := aes.BlockSize
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for bs, be := 0, size; bs < len(data); bs, be = bs+size, be+size {
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if be > len(data) {
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break
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}
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cipher.Decrypt(decrypted[bs:be], data[bs:be])
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}
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return decrypted
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}
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