cregit-Linux how code gets into the kernel

Release 4.17 crypto/md4.c

Directory: crypto
/* 
 * Cryptographic API.
 *
 * MD4 Message Digest Algorithm (RFC1320).
 *
 * Implementation derived from Andrew Tridgell and Steve French's
 * CIFS MD4 implementation, and the cryptoapi implementation
 * originally based on the public domain implementation written
 * by Colin Plumb in 1993.
 *
 * Copyright (c) Andrew Tridgell 1997-1998.
 * Modified by Steve French (sfrench@us.ibm.com) 2002
 * Copyright (c) Cryptoapi developers.
 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 *
 * 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/internal/hash.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/types.h>
#include <asm/byteorder.h>


#define MD4_DIGEST_SIZE		16

#define MD4_HMAC_BLOCK_SIZE	64

#define MD4_BLOCK_WORDS		16

#define MD4_HASH_WORDS		4


struct md4_ctx {
	
u32 hash[MD4_HASH_WORDS];
	
u32 block[MD4_BLOCK_WORDS];
	
u64 byte_count;
};


static inline u32 lshift(u32 x, unsigned int s) { x &= 0xFFFFFFFF; return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3794.87%133.33%
James Morris25.13%266.67%
Total39100.00%3100.00%


static inline u32 F(u32 x, u32 y, u32 z) { return (x & y) | ((~x) & z); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller32100.00%1100.00%
Total32100.00%1100.00%


static inline u32 G(u32 x, u32 y, u32 z) { return (x & y) | (x & z) | (y & z); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller35100.00%1100.00%
Total35100.00%1100.00%


static inline u32 H(u32 x, u32 y, u32 z) { return x ^ y ^ z; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller23100.00%1100.00%
Total23100.00%1100.00%

#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s)) #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
static void md4_transform(u32 *hash, u32 const *in) { u32 a, b, c, d; a = hash[0]; b = hash[1]; c = hash[2]; d = hash[3]; ROUND1(a, b, c, d, in[0], 3); ROUND1(d, a, b, c, in[1], 7); ROUND1(c, d, a, b, in[2], 11); ROUND1(b, c, d, a, in[3], 19); ROUND1(a, b, c, d, in[4], 3); ROUND1(d, a, b, c, in[5], 7); ROUND1(c, d, a, b, in[6], 11); ROUND1(b, c, d, a, in[7], 19); ROUND1(a, b, c, d, in[8], 3); ROUND1(d, a, b, c, in[9], 7); ROUND1(c, d, a, b, in[10], 11); ROUND1(b, c, d, a, in[11], 19); ROUND1(a, b, c, d, in[12], 3); ROUND1(d, a, b, c, in[13], 7); ROUND1(c, d, a, b, in[14], 11); ROUND1(b, c, d, a, in[15], 19); ROUND2(a, b, c, d,in[ 0], 3); ROUND2(d, a, b, c, in[4], 5); ROUND2(c, d, a, b, in[8], 9); ROUND2(b, c, d, a, in[12], 13); ROUND2(a, b, c, d, in[1], 3); ROUND2(d, a, b, c, in[5], 5); ROUND2(c, d, a, b, in[9], 9); ROUND2(b, c, d, a, in[13], 13); ROUND2(a, b, c, d, in[2], 3); ROUND2(d, a, b, c, in[6], 5); ROUND2(c, d, a, b, in[10], 9); ROUND2(b, c, d, a, in[14], 13); ROUND2(a, b, c, d, in[3], 3); ROUND2(d, a, b, c, in[7], 5); ROUND2(c, d, a, b, in[11], 9); ROUND2(b, c, d, a, in[15], 13); ROUND3(a, b, c, d,in[ 0], 3); ROUND3(d, a, b, c, in[8], 9); ROUND3(c, d, a, b, in[4], 11); ROUND3(b, c, d, a, in[12], 15); ROUND3(a, b, c, d, in[2], 3); ROUND3(d, a, b, c, in[10], 9); ROUND3(c, d, a, b, in[6], 11); ROUND3(b, c, d, a, in[14], 15); ROUND3(a, b, c, d, in[1], 3); ROUND3(d, a, b, c, in[9], 9); ROUND3(c, d, a, b, in[5], 11); ROUND3(b, c, d, a, in[13], 15); ROUND3(a, b, c, d, in[3], 3); ROUND3(d, a, b, c, in[11], 9); ROUND3(c, d, a, b, in[7], 11); ROUND3(b, c, d, a, in[15], 15); hash[0] += a; hash[1] += b; hash[2] += c; hash[3] += d; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller944100.00%1100.00%
Total944100.00%1100.00%


static inline void md4_transform_helper(struct md4_ctx *ctx) { le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block)); md4_transform(ctx->hash, ctx->block); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3697.30%150.00%
Julia Lawall12.70%150.00%
Total37100.00%2100.00%


static int md4_init(struct shash_desc *desc) { struct md4_ctx *mctx = shash_desc_ctx(desc); mctx->hash[0] = 0x67452301; mctx->hash[1] = 0xefcdab89; mctx->hash[2] = 0x98badcfe; mctx->hash[3] = 0x10325476; mctx->byte_count = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller5583.33%133.33%
Adrian-Ken Rueegsegger812.12%133.33%
Herbert Xu34.55%133.33%
Total66100.00%3100.00%


static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct md4_ctx *mctx = shash_desc_ctx(desc); const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); mctx->byte_count += len; if (avail > len) { memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, len); return 0; } memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, avail); md4_transform_helper(mctx); data += avail; len -= avail; while (len >= sizeof(mctx->block)) { memcpy(mctx->block, data, sizeof(mctx->block)); md4_transform_helper(mctx); data += sizeof(mctx->block); len -= sizeof(mctx->block); } memcpy(mctx->block, data, len); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller18191.88%125.00%
Adrian-Ken Rueegsegger115.58%125.00%
Herbert Xu31.52%125.00%
James Morris21.02%125.00%
Total197100.00%4100.00%


static int md4_final(struct shash_desc *desc, u8 *out) { struct md4_ctx *mctx = shash_desc_ctx(desc); const unsigned int offset = mctx->byte_count & 0x3f; char *p = (char *)mctx->block + offset; int padding = 56 - (offset + 1); *p++ = 0x80; if (padding < 0) { memset(p, 0x00, padding + sizeof (u64)); md4_transform_helper(mctx); p = (char *)mctx->block; padding = 56; } memset(p, 0, padding); mctx->block[14] = mctx->byte_count << 3; mctx->block[15] = mctx->byte_count >> 29; le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - sizeof(u64)) / sizeof(u32)); md4_transform(mctx->hash, mctx->block); cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash)); memcpy(out, mctx->hash, sizeof(mctx->hash)); memset(mctx, 0, sizeof(*mctx)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller21293.81%116.67%
Adrian-Ken Rueegsegger83.54%116.67%
Herbert Xu31.33%116.67%
Andrew Morton10.44%116.67%
Julia Lawall10.44%116.67%
James Morris10.44%116.67%
Total226100.00%6100.00%

static struct shash_alg alg = { .digestsize = MD4_DIGEST_SIZE, .init = md4_init, .update = md4_update, .final = md4_final, .descsize = sizeof(struct md4_ctx), .base = { .cra_name = "md4", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = MD4_HMAC_BLOCK_SIZE, .cra_module = THIS_MODULE, } };
static int __init md4_mod_init(void) { return crypto_register_shash(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1487.50%133.33%
Kamalesh Babulal16.25%133.33%
Adrian-Ken Rueegsegger16.25%133.33%
Total16100.00%3100.00%


static void __exit md4_mod_fini(void) { crypto_unregister_shash(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1386.67%133.33%
Adrian-Ken Rueegsegger16.67%133.33%
Kamalesh Babulal16.67%133.33%
Total15100.00%3100.00%

module_init(md4_mod_init); module_exit(md4_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("MD4 Message Digest Algorithm"); MODULE_ALIAS_CRYPTO("md4");

Overall Contributors

PersonTokensPropCommitsCommitProp
David S. Miller173495.01%18.33%
Adrian-Ken Rueegsegger542.96%18.33%
Herbert Xu120.66%216.67%
James Morris100.55%325.00%
Kees Cook50.27%18.33%
Kamalesh Babulal40.22%18.33%
Paul Gortmaker30.16%18.33%
Julia Lawall20.11%18.33%
Andrew Morton10.05%18.33%
Total1825100.00%12100.00%
Directory: crypto
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