/*
** 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;
}
/**
* Writes the passed buffer to the file fp and updates the signature contexts.
*
* @param fpDest The file pointer to write to.
* @param buffer The buffer to write.
* @param size The size of the buffer to write.
* @param ctxs Pointer to the first element in an array of signature
* contexts to update.
* @param ctxCount The number of signature contexts pointed to by ctxs
* @param err The name of what is being written to in case of error.
* @return 0 on success
* -2 on write error
* -3 on signature update error
*/
int
WriteAndUpdateSignatures(FILE *fpDest, void *buffer,
uint32_t size, SGNContext **ctxs,
uint32_t ctxCount,
const char *err)
{
uint32_t k;
if (!size) {
return 0;
}
if (fwrite(buffer, size, 1, fpDest) != 1) {
fprintf(stderr, "ERROR: Could not write %s\n", err);
return -2;
}
for (k = 0; k < ctxCount; ++k) {
if (SGN_Update(ctxs[k], buffer, size) != SECSuccess) {
fprintf(stderr, "ERROR: Could not update signature context for %s\n", err);
return -3;
}
}
return 0;
}