44 lines
792 B
Go
44 lines
792 B
Go
package rsa
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import (
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"crypto/rand"
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"crypto/rsa"
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"fmt"
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"github.com/ucan-wg/go-did-it/crypto"
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)
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const (
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MultibaseCode = uint64(0x1205)
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MinRsaKeyBits = 2048
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MaxRsaKeyBits = 8192
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)
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func GenerateKeyPair(bits int) (*PublicKey, *PrivateKey, error) {
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if bits < MinRsaKeyBits || bits > MaxRsaKeyBits {
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return nil, nil, fmt.Errorf("invalid key size: %d", bits)
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}
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priv, err := rsa.GenerateKey(rand.Reader, bits)
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if err != nil {
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return nil, nil, err
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}
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return &PublicKey{k: &priv.PublicKey}, &PrivateKey{k: priv}, nil
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}
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const (
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pemPubBlockType = "PUBLIC KEY"
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pemPrivBlockType = "PRIVATE KEY"
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)
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func defaultSigHash(keyLen int) crypto.Hash {
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switch {
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case keyLen <= 2048:
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return crypto.SHA256
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case keyLen <= 3072:
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return crypto.SHA384
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default:
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return crypto.SHA512
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}
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}
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