//Construct a new instance. see crypto/aes
// returning a block cipher that satisfies the crypto/cipher.Block interface
func NewCipher(key []byte) (cipher.Block, error) {
aes := new(aesKey)
key_p := pointerFromBytes(key)
key_bits := C.int(len(key) * 8)
if ret := C.AES_set_encrypt_key(key_p, key_bits, &aes._aes_encrypt_key); ret != 0 {
// in case the error is something deep in OpenSSL land
if err := sslerr.Error(); err != nil {
return aes, err
}
if ret == -1 {
return aes, errorInvalidKey
}
if ret == -2 {
return aes, errorWrongSizeKey
}
// standard fallback error
return aes, errorSettingKey
}
if ret := C.AES_set_decrypt_key(key_p, key_bits, &aes._aes_decrypt_key); ret != 0 {
// in case the error is something deep in OpenSSL land
if err := sslerr.Error(); err != nil {
return aes, err
}
if ret == -1 {
return aes, errorInvalidKey
}
if ret == -2 {
return aes, errorWrongSizeKey
}
// standard fallback error
return aes, errorSettingKey
}
return aes, nil
}
// Create a new AES block cipher.
// The key must be 16, 24, or 32 bytes long.
func NewAES(key []byte) cipher.Block {
a := &aes{}
if C.AES_set_encrypt_key((*C.uchar)(&key[0]), C.int(len(key)*8), &a.key) != 0 {
panic("C.AES_set_encrypt_key failed")
}
return a
}
// Create a new stream cipher based on AES in counter mode.
// The key must be 16, 24, or 32 bytes long.
func newAESCTR(key []byte) cipher.Stream {
a := &aesctr{}
if C.AES_set_encrypt_key((*C.uchar)(&key[0]), C.int(len(key)*8), &a.key) != 0 {
panic("C.AES_set_encrypt_key failed")
}
// counter automatically starts at 0
a.idx = blocksize // need a fresh block first time
return a
}
//Construct a new instance. see crypto/aes
func NewCipher(key []byte) (cipher.Block, error) {
aes := new(AESKey)
key_p := pointerFromBytes(key)
key_bits := C.int(len(key) * 8)
if C.AES_set_encrypt_key(key_p, key_bits, &aes._aes_encrypt_key) != 0 {
return aes, errors.New("problem setting key")
}
if C.AES_set_decrypt_key(key_p, key_bits, &aes._aes_decrypt_key) != 0 {
return aes, errors.New("problem setting key")
}
return aes, nil
}