package dns
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import (
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"crypto"
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"crypto/dsa"
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"crypto/ecdsa"
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"crypto/rsa"
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"math/big"
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"strconv"
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"golang.org/x/crypto/ed25519"
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)
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const format = "Private-key-format: v1.3\n"
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var bigIntOne = big.NewInt(1)
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// PrivateKeyString converts a PrivateKey to a string. This string has the same
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// format as the private-key-file of BIND9 (Private-key-format: v1.3).
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// It needs some info from the key (the algorithm), so its a method of the DNSKEY
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// It supports rsa.PrivateKey, ecdsa.PrivateKey and dsa.PrivateKey
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func (r *DNSKEY) PrivateKeyString(p crypto.PrivateKey) string {
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algorithm := strconv.Itoa(int(r.Algorithm))
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algorithm += " (" + AlgorithmToString[r.Algorithm] + ")"
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switch p := p.(type) {
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case *rsa.PrivateKey:
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modulus := toBase64(p.PublicKey.N.Bytes())
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e := big.NewInt(int64(p.PublicKey.E))
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publicExponent := toBase64(e.Bytes())
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privateExponent := toBase64(p.D.Bytes())
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prime1 := toBase64(p.Primes[0].Bytes())
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prime2 := toBase64(p.Primes[1].Bytes())
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// Calculate Exponent1/2 and Coefficient as per: http://en.wikipedia.org/wiki/RSA#Using_the_Chinese_remainder_algorithm
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// and from: http://code.google.com/p/go/issues/detail?id=987
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p1 := new(big.Int).Sub(p.Primes[0], bigIntOne)
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q1 := new(big.Int).Sub(p.Primes[1], bigIntOne)
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exp1 := new(big.Int).Mod(p.D, p1)
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exp2 := new(big.Int).Mod(p.D, q1)
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coeff := new(big.Int).ModInverse(p.Primes[1], p.Primes[0])
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exponent1 := toBase64(exp1.Bytes())
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exponent2 := toBase64(exp2.Bytes())
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coefficient := toBase64(coeff.Bytes())
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return format +
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"Algorithm: " + algorithm + "\n" +
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"Modulus: " + modulus + "\n" +
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"PublicExponent: " + publicExponent + "\n" +
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"PrivateExponent: " + privateExponent + "\n" +
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"Prime1: " + prime1 + "\n" +
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"Prime2: " + prime2 + "\n" +
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"Exponent1: " + exponent1 + "\n" +
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"Exponent2: " + exponent2 + "\n" +
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"Coefficient: " + coefficient + "\n"
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case *ecdsa.PrivateKey:
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var intlen int
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switch r.Algorithm {
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case ECDSAP256SHA256:
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intlen = 32
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case ECDSAP384SHA384:
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intlen = 48
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}
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private := toBase64(intToBytes(p.D, intlen))
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return format +
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"Algorithm: " + algorithm + "\n" +
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"PrivateKey: " + private + "\n"
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case *dsa.PrivateKey:
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T := divRoundUp(divRoundUp(p.PublicKey.Parameters.G.BitLen(), 8)-64, 8)
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prime := toBase64(intToBytes(p.PublicKey.Parameters.P, 64+T*8))
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subprime := toBase64(intToBytes(p.PublicKey.Parameters.Q, 20))
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base := toBase64(intToBytes(p.PublicKey.Parameters.G, 64+T*8))
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priv := toBase64(intToBytes(p.X, 20))
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pub := toBase64(intToBytes(p.PublicKey.Y, 64+T*8))
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return format +
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"Algorithm: " + algorithm + "\n" +
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"Prime(p): " + prime + "\n" +
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"Subprime(q): " + subprime + "\n" +
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"Base(g): " + base + "\n" +
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"Private_value(x): " + priv + "\n" +
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"Public_value(y): " + pub + "\n"
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case ed25519.PrivateKey:
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private := toBase64(p.Seed())
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return format +
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"Algorithm: " + algorithm + "\n" +
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"PrivateKey: " + private + "\n"
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default:
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return ""
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}
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}
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