cregit-Linux how code gets into the kernel

Release 4.10 crypto/chacha20_generic.c

Directory: crypto
/*
 * ChaCha20 256-bit cipher algorithm, RFC7539
 *
 * Copyright (C) 2015 Martin Willi
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <crypto/algapi.h>
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <crypto/chacha20.h>


static inline u32 le32_to_cpuvp(const void *p) { return le32_to_cpup(p); }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi18100.00%1100.00%
Total18100.00%1100.00%


static void chacha20_docrypt(u32 *state, u8 *dst, const u8 *src, unsigned int bytes) { u8 stream[CHACHA20_BLOCK_SIZE]; if (dst != src) memcpy(dst, src, bytes); while (bytes >= CHACHA20_BLOCK_SIZE) { chacha20_block(state, stream); crypto_xor(dst, stream, CHACHA20_BLOCK_SIZE); bytes -= CHACHA20_BLOCK_SIZE; dst += CHACHA20_BLOCK_SIZE; } if (bytes) { chacha20_block(state, stream); crypto_xor(dst, stream, bytes); } }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi98100.00%1100.00%
Total98100.00%1100.00%


void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv) { static const char constant[16] = "expand 32-byte k"; state[0] = le32_to_cpuvp(constant + 0); state[1] = le32_to_cpuvp(constant + 4); state[2] = le32_to_cpuvp(constant + 8); state[3] = le32_to_cpuvp(constant + 12); state[4] = ctx->key[0]; state[5] = ctx->key[1]; state[6] = ctx->key[2]; state[7] = ctx->key[3]; state[8] = ctx->key[4]; state[9] = ctx->key[5]; state[10] = ctx->key[6]; state[11] = ctx->key[7]; state[12] = le32_to_cpuvp(iv + 0); state[13] = le32_to_cpuvp(iv + 4); state[14] = le32_to_cpuvp(iv + 8); state[15] = le32_to_cpuvp(iv + 12); }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi220100.00%2100.00%
Total220100.00%2100.00%

EXPORT_SYMBOL_GPL(crypto_chacha20_init);
int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keysize) { struct chacha20_ctx *ctx = crypto_tfm_ctx(tfm); int i; if (keysize != CHACHA20_KEY_SIZE) return -EINVAL; for (i = 0; i < ARRAY_SIZE(ctx->key); i++) ctx->key[i] = le32_to_cpuvp(key + i * sizeof(u32)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi82100.00%2100.00%
Total82100.00%2100.00%

EXPORT_SYMBOL_GPL(crypto_chacha20_setkey);
int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct blkcipher_walk walk; u32 state[16]; int err; blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt_block(desc, &walk, CHACHA20_BLOCK_SIZE); crypto_chacha20_init(state, crypto_blkcipher_ctx(desc->tfm), walk.iv); while (walk.nbytes >= CHACHA20_BLOCK_SIZE) { chacha20_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr, rounddown(walk.nbytes, CHACHA20_BLOCK_SIZE)); err = blkcipher_walk_done(desc, &walk, walk.nbytes % CHACHA20_BLOCK_SIZE); } if (walk.nbytes) { chacha20_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes); err = blkcipher_walk_done(desc, &walk, 0); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi181100.00%2100.00%
Total181100.00%2100.00%

EXPORT_SYMBOL_GPL(crypto_chacha20_crypt); static struct crypto_alg alg = { .cra_name = "chacha20", .cra_driver_name = "chacha20-generic", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, .cra_blocksize = 1, .cra_type = &crypto_blkcipher_type, .cra_ctxsize = sizeof(struct chacha20_ctx), .cra_alignmask = sizeof(u32) - 1, .cra_module = THIS_MODULE, .cra_u = { .blkcipher = { .min_keysize = CHACHA20_KEY_SIZE, .max_keysize = CHACHA20_KEY_SIZE, .ivsize = CHACHA20_IV_SIZE, .geniv = "seqiv", .setkey = crypto_chacha20_setkey, .encrypt = crypto_chacha20_crypt, .decrypt = crypto_chacha20_crypt, }, }, };
static int __init chacha20_generic_mod_init(void) { return crypto_register_alg(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi16100.00%1100.00%
Total16100.00%1100.00%


static void __exit chacha20_generic_mod_fini(void) { crypto_unregister_alg(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi15100.00%1100.00%
Total15100.00%1100.00%

module_init(chacha20_generic_mod_init); module_exit(chacha20_generic_mod_fini); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); MODULE_DESCRIPTION("chacha20 cipher algorithm"); MODULE_ALIAS_CRYPTO("chacha20"); MODULE_ALIAS_CRYPTO("chacha20-generic");

Overall Contributors

PersonTokensPropCommitsCommitProp
martin willimartin willi803100.00%2100.00%
Total803100.00%2100.00%
Directory: crypto
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.