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98 lines
3.3 KiB
98 lines
3.3 KiB
#ifndef crypto_stream_chacha20_H
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#define crypto_stream_chacha20_H
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/*
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* WARNING: This is just a stream cipher. It is NOT authenticated encryption.
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* While it provides some protection against eavesdropping, it does NOT
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* provide any security against active attacks.
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* Unless you know what you're doing, what you are looking for is probably
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* the crypto_box functions.
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include "export.h"
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#ifdef __cplusplus
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# ifdef __GNUC__
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# pragma GCC diagnostic ignored "-Wlong-long"
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# endif
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extern "C" {
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#endif
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#define crypto_stream_chacha20_KEYBYTES 32U
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SODIUM_EXPORT
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size_t crypto_stream_chacha20_keybytes(void);
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#define crypto_stream_chacha20_NONCEBYTES 8U
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SODIUM_EXPORT
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size_t crypto_stream_chacha20_noncebytes(void);
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#define crypto_stream_chacha20_MESSAGEBYTES_MAX SODIUM_SIZE_MAX
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SODIUM_EXPORT
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size_t crypto_stream_chacha20_messagebytes_max(void);
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/* ChaCha20 with a 64-bit nonce and a 64-bit counter, as originally designed */
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SODIUM_EXPORT
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int crypto_stream_chacha20(unsigned char *c, unsigned long long clen,
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const unsigned char *n, const unsigned char *k);
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SODIUM_EXPORT
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int crypto_stream_chacha20_xor(unsigned char *c, const unsigned char *m,
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unsigned long long mlen, const unsigned char *n,
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const unsigned char *k);
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SODIUM_EXPORT
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int crypto_stream_chacha20_xor_ic(unsigned char *c, const unsigned char *m,
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unsigned long long mlen,
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const unsigned char *n, uint64_t ic,
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const unsigned char *k);
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SODIUM_EXPORT
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void crypto_stream_chacha20_keygen(unsigned char k[crypto_stream_chacha20_KEYBYTES]);
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/* ChaCha20 with a 96-bit nonce and a 32-bit counter (IETF) */
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#define crypto_stream_chacha20_ietf_KEYBYTES 32U
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SODIUM_EXPORT
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size_t crypto_stream_chacha20_ietf_keybytes(void);
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#define crypto_stream_chacha20_ietf_NONCEBYTES 12U
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SODIUM_EXPORT
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size_t crypto_stream_chacha20_ietf_noncebytes(void);
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#define crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX \
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SODIUM_MIN(SODIUM_SIZE_MAX, 64ULL * (1ULL << 32))
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SODIUM_EXPORT
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size_t crypto_stream_chacha20_ietf_messagebytes_max(void);
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SODIUM_EXPORT
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int crypto_stream_chacha20_ietf(unsigned char *c, unsigned long long clen,
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const unsigned char *n, const unsigned char *k);
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SODIUM_EXPORT
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int crypto_stream_chacha20_ietf_xor(unsigned char *c, const unsigned char *m,
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unsigned long long mlen, const unsigned char *n,
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const unsigned char *k);
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SODIUM_EXPORT
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int crypto_stream_chacha20_ietf_xor_ic(unsigned char *c, const unsigned char *m,
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unsigned long long mlen,
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const unsigned char *n, uint32_t ic,
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const unsigned char *k);
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SODIUM_EXPORT
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void crypto_stream_chacha20_ietf_keygen(unsigned char k[crypto_stream_chacha20_ietf_KEYBYTES]);
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/* Aliases */
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#define crypto_stream_chacha20_IETF_KEYBYTES crypto_stream_chacha20_ietf_KEYBYTES
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#define crypto_stream_chacha20_IETF_NONCEBYTES crypto_stream_chacha20_ietf_NONCEBYTES
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#define crypto_stream_chacha20_IETF_MESSAGEBYTES_MAX crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX
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#ifdef __cplusplus
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}
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#endif
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#endif
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