gnunet-android

GNUnet for Android
Log | Files | Refs | README

crypto_stream_chacha20.h (3672B)

      1 #ifndef crypto_stream_chacha20_H
      2 #define crypto_stream_chacha20_H
      3 
      4 /*
      5  *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
      6  *  While it provides some protection against eavesdropping, it does NOT
      7  *  provide any security against active attacks.
      8  *  Unless you know what you're doing, what you are looking for is probably
      9  *  the crypto_box functions.
     10  */
     11 
     12 #include <stddef.h>
     13 #include <stdint.h>
     14 #include "export.h"
     15 
     16 #ifdef __cplusplus
     17 # ifdef __GNUC__
     18 #  pragma GCC diagnostic ignored "-Wlong-long"
     19 # endif
     20 extern "C" {
     21 #endif
     22 
     23 #define crypto_stream_chacha20_KEYBYTES 32U
     24 SODIUM_EXPORT
     25 size_t crypto_stream_chacha20_keybytes(void);
     26 
     27 #define crypto_stream_chacha20_NONCEBYTES 8U
     28 SODIUM_EXPORT
     29 size_t crypto_stream_chacha20_noncebytes(void);
     30 
     31 #define crypto_stream_chacha20_MESSAGEBYTES_MAX SODIUM_SIZE_MAX
     32 SODIUM_EXPORT
     33 size_t crypto_stream_chacha20_messagebytes_max(void);
     34 
     35 /* ChaCha20 with a 64-bit nonce and a 64-bit counter, as originally designed */
     36 
     37 SODIUM_EXPORT
     38 int crypto_stream_chacha20(unsigned char *c, unsigned long long clen,
     39                            const unsigned char *n, const unsigned char *k)
     40             __attribute__ ((nonnull));
     41 
     42 SODIUM_EXPORT
     43 int crypto_stream_chacha20_xor(unsigned char *c, const unsigned char *m,
     44                                unsigned long long mlen, const unsigned char *n,
     45                                const unsigned char *k)
     46             __attribute__ ((nonnull));
     47 
     48 SODIUM_EXPORT
     49 int crypto_stream_chacha20_xor_ic(unsigned char *c, const unsigned char *m,
     50                                   unsigned long long mlen,
     51                                   const unsigned char *n, uint64_t ic,
     52                                   const unsigned char *k)
     53             __attribute__ ((nonnull));
     54 
     55 SODIUM_EXPORT
     56 void crypto_stream_chacha20_keygen(unsigned char k[crypto_stream_chacha20_KEYBYTES])
     57             __attribute__ ((nonnull));
     58 
     59 /* ChaCha20 with a 96-bit nonce and a 32-bit counter (IETF) */
     60 
     61 #define crypto_stream_chacha20_ietf_KEYBYTES 32U
     62 SODIUM_EXPORT
     63 size_t crypto_stream_chacha20_ietf_keybytes(void);
     64 
     65 #define crypto_stream_chacha20_ietf_NONCEBYTES 12U
     66 SODIUM_EXPORT
     67 size_t crypto_stream_chacha20_ietf_noncebytes(void);
     68 
     69 #define crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX \
     70     SODIUM_MIN(SODIUM_SIZE_MAX, 64ULL * (1ULL << 32))
     71 SODIUM_EXPORT
     72 size_t crypto_stream_chacha20_ietf_messagebytes_max(void);
     73 
     74 SODIUM_EXPORT
     75 int crypto_stream_chacha20_ietf(unsigned char *c, unsigned long long clen,
     76                                 const unsigned char *n, const unsigned char *k)
     77             __attribute__ ((nonnull));
     78 
     79 SODIUM_EXPORT
     80 int crypto_stream_chacha20_ietf_xor(unsigned char *c, const unsigned char *m,
     81                                     unsigned long long mlen, const unsigned char *n,
     82                                     const unsigned char *k)
     83             __attribute__ ((nonnull));
     84 
     85 SODIUM_EXPORT
     86 int crypto_stream_chacha20_ietf_xor_ic(unsigned char *c, const unsigned char *m,
     87                                        unsigned long long mlen,
     88                                        const unsigned char *n, uint32_t ic,
     89                                        const unsigned char *k)
     90             __attribute__ ((nonnull));
     91 
     92 SODIUM_EXPORT
     93 void crypto_stream_chacha20_ietf_keygen(unsigned char k[crypto_stream_chacha20_ietf_KEYBYTES])
     94             __attribute__ ((nonnull));
     95 
     96 /* Aliases */
     97 
     98 #define crypto_stream_chacha20_IETF_KEYBYTES crypto_stream_chacha20_ietf_KEYBYTES
     99 #define crypto_stream_chacha20_IETF_NONCEBYTES crypto_stream_chacha20_ietf_NONCEBYTES
    100 #define crypto_stream_chacha20_IETF_MESSAGEBYTES_MAX crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX
    101 
    102 #ifdef __cplusplus
    103 }
    104 #endif
    105 
    106 #endif