49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package gotransip
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha512"
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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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"fmt"
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"net/url"
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)
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var (
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asn1Header = []byte{
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0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
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0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40,
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}
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)
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func signWithKey(params *soapParams, key []byte) (string, error) {
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// create SHA512 hash of given parameters
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h := sha512.New()
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h.Write([]byte(params.Encode()))
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// prefix ASN1 header to SHA512 hash
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digest := append(asn1Header, h.Sum(nil)...)
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// prepare key struct
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block, _ := pem.Decode(key)
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if block == nil {
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return "", errors.New("could not decode private key")
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}
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parsed, err := x509.ParsePKCS8PrivateKey(block.Bytes)
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if err != nil {
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return "", fmt.Errorf("could not parse private key: %s", err.Error())
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}
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pkey := parsed.(*rsa.PrivateKey)
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enc, err := rsa.SignPKCS1v15(rand.Reader, pkey, crypto.Hash(0), digest)
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if err != nil {
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return "", fmt.Errorf("could not sign data: %s", err.Error())
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}
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return url.QueryEscape(base64.StdEncoding.EncodeToString(enc)), nil
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}
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