32 lines
791 B
Go
32 lines
791 B
Go
package util
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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)
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// EncryptWithPublicKey encrypts data with a PEM public key and returns base64 encoded string
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func EncryptWithPublicKey(data string, pemBytes []byte) (string, error) {
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block, _ := pem.Decode(pemBytes)
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if block == nil {
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return "", errors.New("failed to parse PEM block containing the public key")
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}
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pub, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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return "", err
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}
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pubKey, ok := pub.(*rsa.PublicKey)
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if !ok {
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return "", errors.New("not RSA public key")
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}
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ciphertext, err := rsa.EncryptPKCS1v15(rand.Reader, pubKey, []byte(data))
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if err != nil {
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return "", err
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}
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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