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32 lines
658 B
Go
32 lines
658 B
Go
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// Package sm4 implements ShangMi(SM) sm4 symmetric encryption algorithm.
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package sm4
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import (
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"crypto/cipher"
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"strconv"
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"github.com/emmansun/gmsm/internal/sm4"
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)
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// BlockSize the sm4 block size in bytes.
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const BlockSize = 16
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type KeySizeError int
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func (k KeySizeError) Error() string {
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return "sm4: invalid key size " + strconv.Itoa(int(k))
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}
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// NewCipher creates and returns a new [cipher.Block] implementation.
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// The key argument should be the SM4 key, must be 16 bytes long.
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func NewCipher(key []byte) (cipher.Block, error) {
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k := len(key)
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switch k {
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default:
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return nil, KeySizeError(k)
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case 16:
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break
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}
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return sm4.NewCipher(key)
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}
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