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/* SPDX-License-Identifier: GPL-2.0 */ /* * Common values and helper functions for the ChaCha and XChaCha stream ciphers. * * XChaCha extends ChaCha's nonce to 192 bits, while provably retaining ChaCha's * security. Here they share the same key size, tfm context, and setkey * function; only their IV size and encrypt/decrypt function differ. * * The ChaCha paper specifies 20, 12, and 8-round variants. In general, it is * recommended to use the 20-round variant ChaCha20. However, the other * variants can be needed in some performance-sensitive scenarios. The generic * ChaCha code currently allows only the 20 and 12-round variants. */ #ifndef _CRYPTO_CHACHA_H #define _CRYPTO_CHACHA_H #include <crypto/skcipher.h> #include <linux/types.h> #include <linux/crypto.h> /* 32-bit stream position, then 96-bit nonce (RFC7539 convention) */ #define CHACHA_IV_SIZE 16 #define CHACHA_KEY_SIZE 32 #define CHACHA_BLOCK_SIZE 64 #define CHACHAPOLY_IV_SIZE 12 /* 192-bit nonce, then 64-bit stream position */ #define XCHACHA_IV_SIZE 32 struct chacha_ctx { u32 key[8]; int nrounds; }; void chacha_block(u32 *state, u8 *stream, int nrounds); static inline void chacha20_block(u32 *state, u8 *stream) { chacha_block(state, stream, 20); } void hchacha_block(const u32 *in, u32 *out, int nrounds); void crypto_chacha_init(u32 *state, const struct chacha_ctx *ctx, const u8 *iv); int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keysize); int crypto_chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keysize); int crypto_chacha_crypt(struct skcipher_request *req); int crypto_xchacha_crypt(struct skcipher_request *req); enum chacha_constants { /* expand 32-byte k */ CHACHA_CONSTANT_EXPA = 0x61707865U, CHACHA_CONSTANT_ND_3 = 0x3320646eU, CHACHA_CONSTANT_2_BY = 0x79622d32U, CHACHA_CONSTANT_TE_K = 0x6b206574U }; static inline void chacha_init_consts(u32 *state) { state[0] = CHACHA_CONSTANT_EXPA; state[1] = CHACHA_CONSTANT_ND_3; state[2] = CHACHA_CONSTANT_2_BY; state[3] = CHACHA_CONSTANT_TE_K; } #endif /* _CRYPTO_CHACHA_H */
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