On Tuesday, June 19, 2012 8:44:35 AM UTC-4, Krivak wrote:
>
>
> <SNIP>
>
> void GetPublicKeyFromCert(CryptoPP::BufferedTransformation & certin,
> CryptoPP::BufferedTransformation & keyout)
> {
> BERSequenceDecoder x509Cert(certin);
> BERSequenceDecoder tbsCert(x509Cert);
>
> // ASN.1 from RFC 3280
> // TBSCertificate ::= SEQUENCE {
> // version [0] EXPLICIT Version DEFAULT v1,
>
> // consume the context tag on the version
> BERGeneralDecoder context(tbsCert,0xa0);
> word32 ver;
>
> // only want a v3 cert
> BERDecodeUnsigned<word32>(context,ver,INTEGER,2,2);
>
> // serialNumber CertificateSerialNumber,
> Integer serial;
> serial.BERDecode(tbsCert);
>
> // signature AlgorithmIdentifier,
> BERSequenceDecoder signature(tbsCert);
> signature.SkipAll();
>
> // issuer Name,
> BERSequenceDecoder issuerName(tbsCert);
> issuerName.SkipAll();
>
> // validity Validity,
> BERSequenceDecoder validity(tbsCert);
> validity.SkipAll();
>
> // subject Name,
> BERSequenceDecoder subjectName(tbsCert);
> subjectName.SkipAll();
>
> // subjectPublicKeyInfo SubjectPublicKeyInfo,
> BERSequenceDecoder spki(tbsCert);
> DERSequenceEncoder spkiEncoder(keyout);
>
> // My code:
> RSA::PublicKey rsaServerPublicKey;
> rsaServerPublicKey.Load(spki);
> //rsaServerPublicKey.BERDecodePublicKey(spki, false /*optParams*/,
> spki.MaxRetrievable());
> // Here it's going to "BER decode error"....
> // End of My code
>
>
My bad. With a SubjectPublicKeyInfo, you need to look at
http://www.cryptopp.com/wiki/Keys_and_Formats.
Jeff
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