ltomas
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
/*
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* Common values for the ChaCha20 algorithm
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*/
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#ifndef _CRYPTO_CHACHA20_H
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#define _CRYPTO_CHACHA20_H
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#include <linux/types.h>
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#include <linux/crypto.h>
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#define CHACHA20_IV_SIZE 16
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#define CHACHA20_KEY_SIZE 32
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#define CHACHA20_BLOCK_SIZE 64
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struct chacha20_ctx {
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u32 key[8];
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};
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void chacha20_block(u32 *state, u8 *stream);
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void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
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int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keysize);
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int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes);
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enum chacha_constants { /* expand 32-byte k */
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CHACHA_CONSTANT_EXPA = 0x61707865U,
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CHACHA_CONSTANT_ND_3 = 0x3320646eU,
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CHACHA_CONSTANT_2_BY = 0x79622d32U,
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CHACHA_CONSTANT_TE_K = 0x6b206574U
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};
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static inline void chacha_init_consts(u32 *state)
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{
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state[0] = CHACHA_CONSTANT_EXPA;
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state[1] = CHACHA_CONSTANT_ND_3;
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state[2] = CHACHA_CONSTANT_2_BY;
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state[3] = CHACHA_CONSTANT_TE_K;
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}
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#endif
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