RE: Problem with ecdsa

[Jürgen Heiss]

Is there a function which converts to DER encoding?

  _____  

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jürgen Heiss
Sent: Freitag, 16. März 2007 10:30
To: openssl-users@openssl.org
Subject: Problem with ecdsa


Hi everybody,
 
I try to verify a xml file which was signed with ecdsa-sha1.
I alredy read to SignatureValue from the xmlfile. which is.
 
724PlFGHTTL1cFlLFU6g6UetcPVBEAN6oNpogAUx3rgELFH86gA+NqvjVf316zek
 
so this is the base64 encoded version. 
 
But if i call  ecdsa_verify, this doesn't work, because d21_ECDSA need an DER 
encoded version.
Because of this i tried to use BIO_f_base64();
The result was.
 
+ data 0x03198598 "ïn.”Q‡M2õpYK.N éG­põA..z Úh€.1Þ¸.,Qüê" const unsigned char *
 
But still the function d2i_ECDSA failse!
 
 
 ANY IDEAS? I really don't know anymore what else to do!!!
 
 
 
int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len,  const 
unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
{
 ECDSA_SIG *s = NULL;
  int ret=-1;
  unsigned char *p;
 
  s = ECDSA_SIG_new();
  if (s == NULL) return(ret);
  if (d2i_ECDSA_SIG(&s, &sigbuf, sig_len) == NULL) goto err; --> here happens 
the error.
  ret=ECDSA_do_verify(dgst, dgst_len, s, eckey);
 err:
  ECDSA_SIG_free(s);
  return(ret);
  }