93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
//
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// The MIT License (MIT)
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//
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// Copyright (c) 2023 Ihar Katkavets
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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/**
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* Salsa 20 implementation adopted from the reference
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* implementation by D. J. Bernstein https://cr.yp.to/salsa20.html
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* Taken from https://cr.yp.to/snuffle/salsa20/merged/ecrypt-sync.h
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* Public domain.
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*/
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#ifndef salsa20_h
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#define salsa20_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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typedef uint8_t u8;
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typedef uint32_t u32;
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typedef struct
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{
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u32 input[16]; /* could be compressed */
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} SALSA20_ctx;
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void SALSA20_init();
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void SALSA20_keysetup(
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SALSA20_ctx* ctx,
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const u8* key,
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u32 keysize, /* Key size in bits. */
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u32 ivsize); /* IV size in bits. */
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void SALSA20_ivsetup(
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SALSA20_ctx* ctx,
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const u8* iv);
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void SALSA20_encrypt_bytes(
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SALSA20_ctx* ctx,
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const u8* plaintext,
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u8* ciphertext,
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u32 msglen); /* Message length in bytes. */
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void SALSA20_decrypt_bytes(
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SALSA20_ctx* ctx,
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const u8* ciphertext,
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u8* plaintext,
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u32 msglen); /* Message length in bytes. */
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#define SALSA20_BLOCKLENGTH 64 /* [edit] */
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void SALSA20_encrypt_blocks(
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SALSA20_ctx* ctx,
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const u8* plaintext,
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u8* ciphertext,
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u32 blocks); /* Message length in blocks. */
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void SALSA20_decrypt_blocks(
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SALSA20_ctx* ctx,
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const u8* ciphertext,
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u8* plaintext,
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u32 blocks); /* Message length in blocks. */
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#ifdef __cplusplus
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}
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#endif
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#endif /* salsa20_h */
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