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RRTcodebaseC

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#ifdef DC_USE_RPGP
int dc_pgp_symm_decrypt(dc_context_t* context,
const char* passphrase,
const void* ctext, size_t ctext_bytes,
void** ret_plain_text, size_t* ret_plain_bytes)
{
int success = 0;
rpgp_message* encrypted = NULL;
rpgp_message* decrypted = NULL;
encrypted = rpgp_msg_from_bytes(ctext, ctext_bytes);
if (dc_pgp_handle_rpgp_error(context)) {
goto cleanup;
}
decrypted = rpgp_msg_decrypt_with_password(encrypted, passphrase);
if (dc_pgp_handle_rpgp_error(context)) {
goto cleanup;
}
rpgp_cvec* decrypted_bytes = rpgp_msg_to_bytes(decrypted);
if (dc_pgp_handle_rpgp_error(context)) {
goto cleanup;
}
*ret_plain_text = (void*)rpgp_cvec_data(decrypted_bytes);
*ret_plain_bytes = rpgp_cvec_len(decrypted_bytes);
// No drop as we only remove the struct
free(decrypted_bytes);
success = 1;
cleanup:
if (encrypted) { rpgp_msg_drop(encrypted); }
if (decrypted) { rpgp_msg_drop(decrypted); }
return success;
}
#else // !DC_USE_RPGP
int dc_pgp_symm_decrypt(dc_context_t* context,
const char* passphrase,
const void* ctext, size_t ctext_bytes,
void** ret_plain_text, size_t* ret_plain_bytes)
{
int success = 0;
pgp_io_t io;
pgp_memory_t* outmem = NULL;
memset(&io, 0, sizeof(pgp_io_t));
io.outs = stdout;
io.errs = stderr;
io.res = stderr;
if ((outmem=pgp_decrypt_buf(&io, ctext, ctext_bytes, NULL, NULL, 0, 0, passphrase))==NULL) {
goto cleanup;
}
*ret_plain_text = outmem->buf;
*ret_plain_bytes = outmem->length;
free(outmem); /* do not use pgp_memory_free() as we took ownership of the buffer */
outmem = NULL;
success = 1;
cleanup:
if (outmem) { pgp_memory_free(outmem); }
return success;
}
#endif // !DC_USE_RPGP
```
Filename: dc_qr.c
```c
#include <stdarg.h>
#include <unistd.h>
#include "dc_context.h"
#include "dc_apeerstate.h"
#define MAILTO_SCHEME "mailto:"
#define MATMSG_SCHEME "MATMSG:"
#define VCARD_BEGIN "BEGIN:VCARD"
#define SMTP_SCHEME "SMTP:"
/**
* Check a scanned QR code.
* The function should be called after a QR code is scanned.
* The function takes the raw text scanned and checks what can be done with it.
*
* The QR code state is returned in dc_lot_t::state as:
*