yaole
27 lines
657 B
Go
27 lines
657 B
Go
package sm2a
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import (
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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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// ServerDecrypt 服务端协同计算，返回[d_s]·C1给客户端
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func ServerDecrypt(in []byte, ds *sm2.PrivateKey) ([]byte, error) {
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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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x, y = sm2.Curve256.ScalarMult(x, y, ds.D.Bytes())
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out := make([]byte, 0, 2*sm2.ByteSize())
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out = append(out, gmath.BigIntToNByte(x, sm2.ByteSize())...)
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out = append(out, gmath.BigIntToNByte(y, sm2.ByteSize())...)
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// 中间变量内存置0
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gmath.ClearBigInt(x)
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gmath.ClearBigInt(y)
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return out, nil
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}
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