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645211db13
Fix the allmodconfig 'make W=1' warnings: WARNING: modpost: missing MODULE_DESCRIPTION() in lib/crypto/libchacha.o WARNING: modpost: missing MODULE_DESCRIPTION() in lib/crypto/libarc4.o WARNING: modpost: missing MODULE_DESCRIPTION() in lib/crypto/libdes.o WARNING: modpost: missing MODULE_DESCRIPTION() in lib/crypto/libpoly1305.o Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
37 lines
950 B
C
37 lines
950 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The ChaCha stream cipher (RFC7539)
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*
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* Copyright (C) 2015 Martin Willi
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <crypto/algapi.h> // for crypto_xor_cpy
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#include <crypto/chacha.h>
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void chacha_crypt_generic(u32 *state, u8 *dst, const u8 *src,
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unsigned int bytes, int nrounds)
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{
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/* aligned to potentially speed up crypto_xor() */
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u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long));
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while (bytes >= CHACHA_BLOCK_SIZE) {
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chacha_block_generic(state, stream, nrounds);
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crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE);
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bytes -= CHACHA_BLOCK_SIZE;
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dst += CHACHA_BLOCK_SIZE;
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src += CHACHA_BLOCK_SIZE;
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}
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if (bytes) {
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chacha_block_generic(state, stream, nrounds);
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crypto_xor_cpy(dst, src, stream, bytes);
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}
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}
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EXPORT_SYMBOL(chacha_crypt_generic);
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MODULE_DESCRIPTION("ChaCha stream cipher (RFC7539)");
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MODULE_LICENSE("GPL");
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