ECDSA - PEM or DER?

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Hi all,

Have to use ECDSA_sign and ECDSA_verify() with EC_privatekey and certificate
in DER format ? There are some has experience with ECDSA can tell this
stuff?

Many thanks for reply.
Nguyen.

/** ECDSA_sign
* computes ECDSA signature of a given hash value using the supplied
* private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
* \param type this parameter is ignored
* \param dgst pointer to the hash value to sign
* \param dgstlen length of the hash value
* \param sig buffer to hold the DER encoded signature
* \param siglen pointer to the length of the returned signature
* \param eckey pointer to the EC_KEY object containing a private EC key
* \return 1 on success and 0 otherwise
*/
int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);

/** ECDSA_verify
* verifies that the given signature is valid ECDSA signature
* of the supplied hash value using the specified public key.
* \param type this parameter is ignored
* \param dgst pointer to the hash value
* \param dgstlen length of the hash value
* \param sig pointer to the DER encoded signature
* \param siglen length of the DER encoded signature
* \param eckey pointer to the EC_KEY object containing a public EC key
* \return 1 if the signature is valid, 0 if the signature is invalid and -1
on error
*/
int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
const unsigned char *sig, int siglen, EC_KEY *eckey);

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Hi all, Have to use ECDSA_sign and ECDSA_verify() with EC_privatekey and certificate in DER format ? There are some has experience with ECDSA can tell this stuff? Many thanks for reply. Nguyen. 
/** ECDSA_sign  * computes ECDSA signature of a given hash value using the supplied  * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).  * \param type this parameter is ignored  * \param dgst pointer to the hash value to sign 
 * \param dgstlen length of the hash value  * \param sig buffer to hold the DER encoded signature  * \param siglen pointer to the length of the returned signature  * \param eckey pointer to the EC_KEY object containing a private EC key 
 * \return 1 on success and 0 otherwise  */ int      ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,         unsigned char *sig, unsigned int *siglen, EC_KEY *eckey); /** ECDSA_verify 
 * verifies that the given signature is valid ECDSA signature  * of the supplied hash value using the specified public key.  * \param type this parameter is ignored  * \param dgst pointer to the hash value  * \param dgstlen length of the hash value 
 * \param sig  pointer to the DER encoded signature  * \param siglen length of the DER encoded signature  * \param eckey pointer to the EC_KEY object containing a public EC key  * \return 1 if the signature is valid, 0 if the signature is invalid and -1 on error 
 */ int       ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,         const unsigned char *sig, int siglen, EC_KEY *eckey);

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