started with experimental pk export writer

include/pcp.h

@@ -7,7 +7,6 @@ extern "C" {
 
 #include "pcp/base85.h"
 #include "pcp/buffer.h"
-#include "pcp/config.h"
 #include "pcp/crypto.h"
 #include "pcp/defines.h"
 #include "pcp/digital_crc32.h"

include/pcp/buffer.h

@@ -94,4 +94,16 @@ uint64_t buffer_last64(Buffer *b);
 /* read from a file directly into a buffer object */
 size_t buffer_fd_read(Buffer *b, FILE *in, size_t len);
 
+/* write numbers as binary into the buffer */
+void buffer_add8(Buffer *b, uint8_t v);
+void buffer_add16(Buffer *b, uint16_t v);
+void buffer_add32(Buffer *b, uint32_t v);
+void buffer_add64(Buffer *b, uint64_t v);
+
+/* the same, but convert to big-endian before doing so */
+void buffer_add16be(Buffer *b, uint16_t v);
+void buffer_add32be(Buffer *b, uint32_t v);
+void buffer_add64be(Buffer *b, uint64_t v);
+
+
 #endif // HAVE_PCP_BUFFER_H

include/pcp/defines.h

@@ -89,6 +89,8 @@ typedef unsigned int    qbyte;          /*   Quad byte = 32 bits */
 /*  used for self encryption only */
 #define PBP_COMPAT_SALT "qa~t](84z<1t<1oz:ik.@IRNyhG=8q(on9}4#!/_h#a7wqK{Nt$T?W>,mt8NqYq&6U<GB1$,<$j>,rSYI2GRDd:Bcm"
 
+#define PCP_RFC_CIPHER 0x21 /* curve25519+ed25519+poly1305+salsa20+blake2 */
+
 /*  error handling */
 extern char *PCP_ERR;
 extern byte PCP_ERRSET;

include/pcp/key.h

@@ -38,6 +38,7 @@
 #include "uthash.h"
 #include "jenhash.h"
 #include "scrypt.h"
+#include "buffer.h"
 
 /*
   PCP private key structure. Most fields are self explanatory.