yaole
33 lines
847 B
Go
33 lines
847 B
Go
package sm2a
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import (
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"fmt"
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"io"
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"math/big"
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"xdx.jelly/xgcl/gmath"
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"xdx.jelly/xgcl/sm/sm2"
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)
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// ServerEncKeyGen 服务端加密密钥生成
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func ServerEncKeyGen(in []byte, rand io.Reader) (*sm2.PrivateKey, *sm2.PublicKey, []byte, error) {
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buf := make([]byte, sm2.ByteSize())
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if n, err := rand.Read(buf); n != len(buf) || err != nil {
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return nil, nil, nil, fmt.Errorf("Generate random number error")
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}
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ds, _ := sm2.GenPrivateKey(buf)
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pk := sm2.GenPublicKey(ds)
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out := make([]byte, 0, 2*sm2.ByteSize())
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out = append(out, gmath.BigIntToNByte(pk.X, sm2.ByteSize())...)
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out = append(out, gmath.BigIntToNByte(pk.Y, sm2.ByteSize())...)
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x := new(big.Int)
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y := new(big.Int)
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x.SetBytes(in[:sm2.ByteSize()])
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y.SetBytes(in[sm2.ByteSize() : 2*sm2.ByteSize()])
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pk.X, pk.Y = sm2.Curve().Add(pk.X, pk.Y, x, y)
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return ds, pk, out, nil
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}
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