Hello,
> > Can anyone tell me how to get the Private Key Type(DSA /RSA ) and its
> > PEM Length given the buffer containing the Private Key in PEM / DER
> > format.
> If you have buffer in PEM format, key tape can be read from
> first "line" (for example: -----BEGIN DSA PRIVATE KEY-----)
>
> If you have buffer in DER format (ASN1 or other form) there
> is no such information and in general you must know what you have
> or what you expect to get.
>
> Or you may do some sort of guessing depending on key source:
> - RSA private key - ASN1 SEQUENCE of 9 INTEGERS (generic - file)
> - DSA private key - ASN1 SEQUENCE of 6 INTEGERS (generic - file)
> - RSA & DSA public key from certificate - RFC2459
> - RSA public key in DNS - RFC3110
> So public key format (which is transfered from peer to peer)
> depends on application - guessing may be not good idea.
Or high level example of reading private key from PEM buffer
with OpenSSL API may look like:
EVP_PKEY* pkey = NULL;
BIO* bio = NULL;
bio = BIO_new_mem_buf(buf, len);
pkey = PEM_read_bio_PrivateKey(bio,...);
if( pkey->type == EVP_PKEY_RSA ){
// RSA
else if ( pkey->type == EVP_PKEY_DSA ){
// DSA
}
EVP_PKEY_free(pkey);
BIO_free(bio);
Best regards,
--
Marek Marcola <[EMAIL PROTECTED]>
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