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2025-05-12crypto: lib/chacha - add array bounds to function prototypesEric Biggers1-2/+2
Add explicit array bounds to the function prototypes for the parameters that didn't already get handled by the conversion to use chacha_state: - chacha_block_*(): Change 'u8 *out' or 'u8 *stream' to u8 out[CHACHA_BLOCK_SIZE]. - hchacha_block_*(): Change 'u32 *out' or 'u32 *stream' to u32 out[HCHACHA_OUT_WORDS]. - chacha_init(): Change 'const u32 *key' to 'const u32 key[CHACHA_KEY_WORDS]'. Change 'const u8 *iv' to 'const u8 iv[CHACHA_IV_SIZE]'. No functional changes. This just makes it clear when fixed-size arrays are expected. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2025-05-12crypto: lib/chacha - strongly type the ChaCha stateEric Biggers1-5/+6
The ChaCha state matrix is 16 32-bit words. Currently it is represented in the code as a raw u32 array, or even just a pointer to u32. This weak typing is error-prone. Instead, introduce struct chacha_state: struct chacha_state { u32 x[16]; }; Convert all ChaCha and HChaCha functions to use struct chacha_state. No functional changes. Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Kent Overstreet <kent.overstreet@linux.dev> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2025-04-28crypto: s390 - move library functions to arch/s390/lib/crypto/Eric Biggers1-0/+55
Continue disentangling the crypto library functions from the generic crypto infrastructure by moving the s390 ChaCha library functions into a new directory arch/s390/lib/crypto/ that does not depend on CRYPTO. This mirrors the distinction between crypto/ and lib/crypto/. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>