github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/core/crypto/primitives/init.go (about) 1 /* 2 Copyright IBM Corp. 2016 All Rights Reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package primitives 18 19 import ( 20 "crypto/elliptic" 21 "crypto/sha256" 22 "crypto/sha512" 23 "fmt" 24 "sync" 25 26 "golang.org/x/crypto/sha3" 27 ) 28 29 var ( 30 initOnce sync.Once 31 ) 32 33 // Init SHA2 34 func initSHA2(level int) (err error) { 35 switch level { 36 case 256: 37 defaultCurve = elliptic.P256() 38 defaultHash = sha256.New 39 case 384: 40 defaultCurve = elliptic.P384() 41 defaultHash = sha512.New384 42 default: 43 err = fmt.Errorf("Security level not supported [%d]", level) 44 } 45 return 46 } 47 48 // Init SHA3 49 func initSHA3(level int) (err error) { 50 switch level { 51 case 256: 52 defaultCurve = elliptic.P256() 53 defaultHash = sha3.New256 54 case 384: 55 defaultCurve = elliptic.P384() 56 defaultHash = sha3.New384 57 default: 58 err = fmt.Errorf("Security level not supported [%d]", level) 59 } 60 return 61 } 62 63 // SetSecurityLevel sets the security configuration with the hash length and the algorithm 64 func SetSecurityLevel(algorithm string, level int) (err error) { 65 switch algorithm { 66 case "SHA2": 67 err = initSHA2(level) 68 case "SHA3": 69 err = initSHA3(level) 70 default: 71 err = fmt.Errorf("Algorithm not supported [%s]", algorithm) 72 } 73 if err == nil { 74 // TODO: what's this 75 defaultHashAlgorithm = algorithm 76 //hashLength = level 77 } 78 return 79 } 80 81 // InitSecurityLevel initialize the crypto layer at the given security level 82 func InitSecurityLevel(algorithm string, level int) (err error) { 83 initOnce.Do(func() { 84 err = SetSecurityLevel(algorithm, level) 85 }) 86 return 87 }