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/* frames/pem.h
*
* PEM64 encoding for framing.
*
* Copyright 2009 Simtec Electronics
*
* For licence terms refer to the COPYING file.
*/
#ifndef EKEY_FRAMES_PEM_H
#define EKEY_FRAMES_PEM_H
/*
* PEM64 encoding takes bytes and encodes them into characters.
* Each (up-to) three byte input produces four characters of output.
* It is up to the caller to ensure buffers are the right sizes.
*/
/**
* Encode some bytes in PEM64.
*
* @param inbytes The buffer to encode.
* @param nbytes The number of bytes to encode.
* @param outtext The buffer to fill.
* @return The number of characters inserted into the output buffer.
*/
extern int pem64_encode_bytes(const unsigned char *inbytes,
int nbytes,
char *outtext);
/**
* Calculate resulting length of encoding bytes in PEM64.
*
* @param nbytes The number of bytes to encode.
* @return The number of characters required to encode the output bytes.
*/
extern int pem64_encode_bytes_length(int nbytes);
/**
* Decode some text from PEM64.
*
* @param intext The buffer text to decode.
* @param nchars The number of characters in the buffer.
* @param outbytes The buffer to fill.
* @return The number of bytes written into outbytes.
*/
extern int pem64_decode_bytes(const char *intext,
int nchars,
unsigned char *outbytes);
/** Determine how many chars will be needed to encode N bytes */
#define PEM64_CHARS_NEEDED(nbytes) ((((nbytes) + 2) / 3) * 4)
/** Determine how many bytes (may) be needed to decode N chars */
#define PEM64_BYTES_NEEDED(nchars) (((nchars) / 4) * 3)
extern void pem64_encode_12bits(const short value, char *outtext);
extern short pem64_decode_12bits(const char *intext);
#endif /* EKEY_FRAMES_PEM_H */
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