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37 lines
1.3 KiB
Go
37 lines
1.3 KiB
Go
// Package zuc implements ShangMi(SM) zuc stream cipher and integrity algorithm.
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package zuc
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import (
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"github.com/emmansun/gmsm/cipher"
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"github.com/emmansun/gmsm/internal/zuc"
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)
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const (
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// IV size in bytes for zuc 128
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IVSize128 = 16
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// IV size in bytes for zuc 256
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IVSize256 = 23
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// number of words in a round
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RoundWords = 32
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// number of bytes in a word
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WordSize = 4
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// number of bytes in a round
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RoundBytes = RoundWords * WordSize
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)
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// NewCipher create a stream cipher based on key and iv aguments.
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// The key must be 16 bytes long and iv must be 16 bytes long for zuc 128;
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// or the key must be 32 bytes long and iv must be 23 bytes long for zuc 256;
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// otherwise, an error will be returned.
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func NewCipher(key, iv []byte) (cipher.SeekableStream, error) {
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return zuc.NewCipher(key, iv)
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}
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// NewEEACipher create a stream cipher based on key, count, bearer and direction arguments according specification.
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// The key must be 16 bytes long and iv must be 16 bytes long, otherwise, an error will be returned.
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// The count is the 32-bit counter value, the bearer is the 5-bit bearer identity and the direction is the 1-bit
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// transmission direction flag.
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func NewEEACipher(key []byte, count, bearer, direction uint32) (cipher.SeekableStream, error) {
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return zuc.NewEEACipher(key, count, bearer, direction)
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}
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