int pemEncode(
const unsigned char *inData,
unsigned inDataLen,
unsigned char **outData,
unsigned *outDataLen,
const char *headerString)
{
unsigned char *enc;
unsigned encLen;
/* First base64 encode */
enc = cuEnc64WithLines(inData, inDataLen, 64, &encLen);
if(enc == NULL) {
/* malloc error is actually the only known failure */
printf("***pemEncode: Error encoding file. Aborting.\n");
return -1;
}
/* estimate outsize - just be sloppy, way conservative */
size_t outSize = encLen + (2 * strlen(headerString)) + 200;
*outData = (unsigned char *)malloc(outSize);
sprintf((char *)*outData, "-----BEGIN %s-----\n%s-----END %s-----\n",
headerString, (char *)enc, headerString);
*outDataLen = (unsigned int)strlen((char *)*outData);
if((*outData)[*outDataLen - 1] == '\0') {
(*outDataLen)--;
}
free(enc);
return 0;
}
/*
* PEM encode a single SecExportRep's data, appending to a CFData.
*/
OSStatus impExpPemEncodeExportRep(
CFDataRef derData,
const char *pemHeader,
CFArrayRef pemParamLines, // optional
CFMutableDataRef outData)
{
unsigned char *enc;
unsigned encLen;
char headerLine[200];
if(strlen(pemHeader) > 150) {
return errSecParam;
}
/* First base64 encode */
enc = cuEnc64WithLines(CFDataGetBytePtr(derData), (unsigned)CFDataGetLength(derData),
64, &encLen);
if(enc == NULL) {
/* malloc error is actually the only known failure */
SecImpExpDbg("impExpPemEncodeExportRep: cuEnc64WithLines failure");
return errSecAllocate;
}
/* strip off trailing NULL */
if((encLen != 0) && (enc[encLen - 1] == '\0')) {
encLen--;
}
sprintf(headerLine, "-----BEGIN %s-----\n", pemHeader);
CFDataAppendBytes(outData, (const UInt8 *)headerLine, strlen(headerLine));
/* optional PEM parameters lines (currently used for openssl wrap format only) */
if(pemParamLines != NULL) {
CFIndex numLines = CFArrayGetCount(pemParamLines);
for(CFIndex dex=0; dex<numLines; dex++) {
CFStringRef cfStr =
(CFStringRef)CFArrayGetValueAtIndex(pemParamLines, dex);
char cStr[512];
UInt8 nl = '\n';
if(!CFStringGetCString(cfStr, cStr, sizeof(cStr),
kCFStringEncodingASCII)) {
/*
* Should never happen; this module created this CFString
* from a C string with ASCII encoding. Keep going, though
* this is probably fatal to the exported representation.
*/
SecImpExpDbg("impExpPemEncodeExportRep: pemParamLine screwup");
continue;
}
CFDataAppendBytes(outData, (const UInt8 *)cStr, strlen(cStr));
CFDataAppendBytes(outData, &nl, 1);
}
}
CFDataAppendBytes(outData, enc, encLen);
sprintf(headerLine, "-----END %s-----\n", pemHeader);
CFDataAppendBytes(outData, (const UInt8 *)headerLine, strlen(headerLine));
free((void *)enc);
return errSecSuccess;
}
