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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [crypto/] [x509/] [pkcs1.go] - Blame information for rev 833

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1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package x509
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import (
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        "crypto/rsa"
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        "encoding/asn1"
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        "errors"
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        "math/big"
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)
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// pkcs1PrivateKey is a structure which mirrors the PKCS#1 ASN.1 for an RSA private key.
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type pkcs1PrivateKey struct {
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        Version int
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        N       *big.Int
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        E       int
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        D       *big.Int
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        P       *big.Int
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        Q       *big.Int
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        // We ignore these values, if present, because rsa will calculate them.
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        Dp   *big.Int `asn1:"optional"`
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        Dq   *big.Int `asn1:"optional"`
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        Qinv *big.Int `asn1:"optional"`
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        AdditionalPrimes []pkcs1AdditionalRSAPrime `asn1:"optional"`
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}
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type pkcs1AdditionalRSAPrime struct {
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        Prime *big.Int
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        // We ignore these values because rsa will calculate them.
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        Exp   *big.Int
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        Coeff *big.Int
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}
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// ParsePKCS1PrivateKey returns an RSA private key from its ASN.1 PKCS#1 DER encoded form.
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func ParsePKCS1PrivateKey(der []byte) (key *rsa.PrivateKey, err error) {
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        var priv pkcs1PrivateKey
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        rest, err := asn1.Unmarshal(der, &priv)
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        if len(rest) > 0 {
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                err = asn1.SyntaxError{Msg: "trailing data"}
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                return
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        }
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        if err != nil {
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                return
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        }
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        if priv.Version > 1 {
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                return nil, errors.New("x509: unsupported private key version")
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        }
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        if priv.N.Sign() <= 0 || priv.D.Sign() <= 0 || priv.P.Sign() <= 0 || priv.Q.Sign() <= 0 {
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                return nil, errors.New("private key contains zero or negative value")
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        }
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        key = new(rsa.PrivateKey)
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        key.PublicKey = rsa.PublicKey{
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                E: priv.E,
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                N: priv.N,
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        }
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        key.D = priv.D
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        key.Primes = make([]*big.Int, 2+len(priv.AdditionalPrimes))
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        key.Primes[0] = priv.P
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        key.Primes[1] = priv.Q
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        for i, a := range priv.AdditionalPrimes {
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                if a.Prime.Sign() <= 0 {
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                        return nil, errors.New("private key contains zero or negative prime")
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                }
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                key.Primes[i+2] = a.Prime
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                // We ignore the other two values because rsa will calculate
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                // them as needed.
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        }
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        err = key.Validate()
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        if err != nil {
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                return nil, err
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        }
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        key.Precompute()
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        return
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}
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// MarshalPKCS1PrivateKey converts a private key to ASN.1 DER encoded form.
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func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte {
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        key.Precompute()
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        version := 0
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        if len(key.Primes) > 2 {
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                version = 1
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        }
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        priv := pkcs1PrivateKey{
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                Version: version,
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                N:       key.N,
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                E:       key.PublicKey.E,
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                D:       key.D,
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                P:       key.Primes[0],
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                Q:       key.Primes[1],
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                Dp:      key.Precomputed.Dp,
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                Dq:      key.Precomputed.Dq,
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                Qinv:    key.Precomputed.Qinv,
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        }
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        priv.AdditionalPrimes = make([]pkcs1AdditionalRSAPrime, len(key.Precomputed.CRTValues))
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        for i, values := range key.Precomputed.CRTValues {
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                priv.AdditionalPrimes[i].Prime = key.Primes[2+i]
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                priv.AdditionalPrimes[i].Exp = values.Exp
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                priv.AdditionalPrimes[i].Coeff = values.Coeff
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        }
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        b, _ := asn1.Marshal(priv)
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        return b
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}
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// rsaPublicKey reflects the ASN.1 structure of a PKCS#1 public key.
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type rsaPublicKey struct {
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        N *big.Int
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        E int
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}

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