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44 lines
1.7 KiB
Go
44 lines
1.7 KiB
Go
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/*
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Copyright Suzhou Tongji Fintech Research Institute 2017 All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sm2
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import (
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"crypto/elliptic"
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"math/big"
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"sync"
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)
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var initonce sync.Once
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var p256Sm2Params *elliptic.CurveParams
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// 取自elliptic的p256.go文件，修改曲线参数为sm2
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// See FIPS 186-3, section D.2.3
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func initP256Sm2() {
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p256Sm2Params = &elliptic.CurveParams{Name: "SM2-P-256"} // 注明为SM2
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//SM2椭 椭 圆 曲 线 公 钥 密 码 算 法 推 荐 曲 线 参 数
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p256Sm2Params.P, _ = new(big.Int).SetString("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", 16)
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p256Sm2Params.N, _ = new(big.Int).SetString("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", 16)
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p256Sm2Params.B, _ = new(big.Int).SetString("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93", 16)
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p256Sm2Params.Gx, _ = new(big.Int).SetString("32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7", 16)
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p256Sm2Params.Gy, _ = new(big.Int).SetString("BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0", 16)
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p256Sm2Params.BitSize = 256
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}
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func P256Sm2() elliptic.Curve {
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initonce.Do(initP256Sm2)
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return p256Sm2Params
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}
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