/*
** Sign a block of data returning in result a bunch of bytes that are the
** signature. Returns zero on success, an error code on failure.
*/
SECStatus
SEC_SignData(SECItem *res, const unsigned char *buf, int len,
SECKEYPrivateKey *pk, SECOidTag algid)
{
SECStatus rv;
SGNContext *sgn;
sgn = SGN_NewContext(algid, pk);
if (sgn == NULL)
return SECFailure;
rv = SGN_Begin(sgn);
if (rv != SECSuccess)
goto loser;
rv = SGN_Update(sgn, buf, len);
if (rv != SECSuccess)
goto loser;
rv = SGN_End(sgn, res);
loser:
SGN_DestroyContext(sgn, PR_TRUE);
return rv;
}
/**
* Obtains a signing context.
*
* @param ctx A pointer to the signing context to fill
* @return 0 on success
* -1 on error
*/
int
NSSSignBegin(const char *certName,
SGNContext **ctx,
SECKEYPrivateKey **privKey,
CERTCertificate **cert,
uint32_t *signatureLength)
{
secuPWData pwdata = { PW_NONE, 0 };
if (!certName || !ctx || !privKey || !cert || !signatureLength) {
fprintf(stderr, "ERROR: Invalid parameter passed to NSSSignBegin\n");
return -1;
}
/* Get the cert and embedded public key out of the database */
*cert = PK11_FindCertFromNickname(certName, &pwdata);
if (!*cert) {
fprintf(stderr, "ERROR: Could not find cert from nickname\n");
return -1;
}
/* Get the private key out of the database */
*privKey = PK11_FindKeyByAnyCert(*cert, &pwdata);
if (!*privKey) {
fprintf(stderr, "ERROR: Could not find private key\n");
return -1;
}
*signatureLength = PK11_SignatureLen(*privKey);
if (*signatureLength > BLOCKSIZE) {
fprintf(stderr,
"ERROR: Program must be compiled with a larger block size"
" to support signing with signatures this large: %u.\n",
*signatureLength);
return -1;
}
/* Check that the key length is large enough for our requirements */
if (*signatureLength < XP_MIN_SIGNATURE_LEN_IN_BYTES) {
fprintf(stderr, "ERROR: Key length must be >= %d bytes\n",
XP_MIN_SIGNATURE_LEN_IN_BYTES);
return -1;
}
*ctx = SGN_NewContext (SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, *privKey);
if (!*ctx) {
fprintf(stderr, "ERROR: Could not create signature context\n");
return -1;
}
if (SGN_Begin(*ctx) != SECSuccess) {
fprintf(stderr, "ERROR: Could not begin signature\n");
return -1;
}
return 0;
}