9ae433bc79
This converts the ChaCha20 code from a blkcipher to a skcipher, which is now the preferred way to implement symmetric block and stream ciphers. This ports the generic and x86 versions at the same time because the latter reuses routines of the former. Note that the skcipher_walk() API guarantees that all presented blocks except the final one are a multiple of the chunk size, so we can simplify the encrypt() routine somewhat. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
27 lines
601 B
C
27 lines
601 B
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 <crypto/skcipher.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, void *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_skcipher *tfm, const u8 *key,
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unsigned int keysize);
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int crypto_chacha20_crypt(struct skcipher_request *req);
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#endif
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