45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
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package pgpkeys
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"golang.org/x/crypto/openpgp"
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"golang.org/x/crypto/openpgp/packet"
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)
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// EncryptShares takes an ordered set of Shamir key share fragments and
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// PGP public keys and encrypts each Shamir key fragment with the corresponding
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// public key
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//
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// Note: There is no corresponding test function; this functionality is
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// thoroughly tested in the init and rekey command unit tests
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func EncryptShares(secretShares *[][]byte, pgpKeys *[]string) error {
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if len(*secretShares) != len(*pgpKeys) {
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return fmt.Errorf("Mismatch between number of generated shares and number of PGP keys")
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}
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for i, keystring := range *pgpKeys {
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data, err := base64.StdEncoding.DecodeString(keystring)
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if err != nil {
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return fmt.Errorf("Error decoding given PGP key: %s", err)
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}
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entity, err := openpgp.ReadEntity(packet.NewReader(bytes.NewBuffer(data)))
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if err != nil {
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return fmt.Errorf("Error parsing given PGP key: %s", err)
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}
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ctBuf := bytes.NewBuffer(nil)
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pt, err := openpgp.Encrypt(ctBuf, []*openpgp.Entity{entity}, nil, nil, nil)
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if err != nil {
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return fmt.Errorf("Error setting up encryption for PGP message: %s", err)
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}
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_, err = pt.Write((*secretShares)[i])
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if err != nil {
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return fmt.Errorf("Error encrypting PGP message: %s", err)
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}
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pt.Close()
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(*secretShares)[i] = ctBuf.Bytes()
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}
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return nil
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}
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