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32 lines
708 B
Go
32 lines
708 B
Go
package cryptoutil
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/x509"
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"errors"
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)
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// Parses a DER encoded RSA public key
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func ParseASN1RSAPublicKey(derBytes []byte) (*rsa.PublicKey, error) {
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key, err := x509.ParsePKIXPublicKey(derBytes)
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if err != nil {
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return nil, err
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}
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pubKey, ok := key.(*rsa.PublicKey)
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if !ok {
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return nil, errors.New("not an RSA public key")
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}
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return pubKey, nil
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}
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// Encrypts a message with the given public key using RSA-OAEP and the sha1 hash function.
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func RSAEncrypt(pub *rsa.PublicKey, msg []byte) []byte {
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b, err := rsa.EncryptOAEP(sha1.New(), rand.Reader, pub, msg, nil)
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if err != nil {
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panic(err)
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}
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return b
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}
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