OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [crypto/] [x509/] [pkcs1.go] - Blame information for rev 860

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
2 
// Use of this source code is governed by a BSD-style
3 
// license that can be found in the LICENSE file.
4 
 
5 
package x509
6 
 
7 
import (
8 
        "crypto/rsa"
9 
        "encoding/asn1"
10 
        "errors"
11 
        "math/big"
12 
)
13 
 
14 
// pkcs1PrivateKey is a structure which mirrors the PKCS#1 ASN.1 for an RSA private key.
15 
type pkcs1PrivateKey struct {
16 
        Version int
17 
        N       *big.Int
18 
        E       int
19 
        D       *big.Int
20 
        P       *big.Int
21 
        Q       *big.Int
22 
        // We ignore these values, if present, because rsa will calculate them.
23 
        Dp   *big.Int `asn1:"optional"`
24 
        Dq   *big.Int `asn1:"optional"`
25 
        Qinv *big.Int `asn1:"optional"`
26 
 
27 
        AdditionalPrimes []pkcs1AdditionalRSAPrime `asn1:"optional"`
28 
}
29 
 
30 
type pkcs1AdditionalRSAPrime struct {
31 
        Prime *big.Int
32 
 
33 
        // We ignore these values because rsa will calculate them.
34 
        Exp   *big.Int
35 
        Coeff *big.Int
36 
}
37 
 
38 
// ParsePKCS1PrivateKey returns an RSA private key from its ASN.1 PKCS#1 DER encoded form.
39 
func ParsePKCS1PrivateKey(der []byte) (key *rsa.PrivateKey, err error) {
40 
        var priv pkcs1PrivateKey
41 
        rest, err := asn1.Unmarshal(der, &priv)
42 
        if len(rest) > 0 {
43 
                err = asn1.SyntaxError{Msg: "trailing data"}
44 
                return
45 
        }
46 
        if err != nil {
47 
                return
48 
        }
49 
 
50 
        if priv.Version > 1 {
51 
                return nil, errors.New("x509: unsupported private key version")
52 
        }
53 
 
54 
        if priv.N.Sign() <= 0 || priv.D.Sign() <= 0 || priv.P.Sign() <= 0 || priv.Q.Sign() <= 0 {
55 
                return nil, errors.New("private key contains zero or negative value")
56 
        }
57 
 
58 
        key = new(rsa.PrivateKey)
59 
        key.PublicKey = rsa.PublicKey{
60 
                E: priv.E,
61 
                N: priv.N,
62 
        }
63 
 
64 
        key.D = priv.D
65 
        key.Primes = make([]*big.Int, 2+len(priv.AdditionalPrimes))
66 
        key.Primes[0] = priv.P
67 
        key.Primes[1] = priv.Q
68 
        for i, a := range priv.AdditionalPrimes {
69 
                if a.Prime.Sign() <= 0 {
70 
                        return nil, errors.New("private key contains zero or negative prime")
71 
                }
72 
                key.Primes[i+2] = a.Prime
73 
                // We ignore the other two values because rsa will calculate
74 
                // them as needed.
75 
        }
76 
 
77 
        err = key.Validate()
78 
        if err != nil {
79 
                return nil, err
80 
        }
81 
        key.Precompute()
82 
 
83 
        return
84 
}
85 
 
86 
// MarshalPKCS1PrivateKey converts a private key to ASN.1 DER encoded form.
87 
func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte {
88 
        key.Precompute()
89 
 
90 
        version := 0
91 
        if len(key.Primes) > 2 {
92 
                version = 1
93 
        }
94 
 
95 
        priv := pkcs1PrivateKey{
96 
                Version: version,
97 
                N:       key.N,
98 
                E:       key.PublicKey.E,
99 
                D:       key.D,
100 
                P:       key.Primes[0],
101 
                Q:       key.Primes[1],
102 
                Dp:      key.Precomputed.Dp,
103 
                Dq:      key.Precomputed.Dq,
104 
                Qinv:    key.Precomputed.Qinv,
105 
        }
106 
 
107 
        priv.AdditionalPrimes = make([]pkcs1AdditionalRSAPrime, len(key.Precomputed.CRTValues))
108 
        for i, values := range key.Precomputed.CRTValues {
109 
                priv.AdditionalPrimes[i].Prime = key.Primes[2+i]
110 
                priv.AdditionalPrimes[i].Exp = values.Exp
111 
                priv.AdditionalPrimes[i].Coeff = values.Coeff
112 
        }
113 
 
114 
        b, _ := asn1.Marshal(priv)
115 
        return b
116 
}
117 
 
118 
// rsaPublicKey reflects the ASN.1 structure of a PKCS#1 public key.
119 
type rsaPublicKey struct {
120 
        N *big.Int
121 
        E int
122 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.