cregit-Linux how code gets into the kernel

Release 4.11 crypto/md5.c

Directory: crypto
/* 
 * Cryptographic API.
 *
 * MD5 Message Digest Algorithm (RFC1321).
 *
 * Derived from cryptoapi implementation, originally based on the
 * public domain implementation written by Colin Plumb in 1993.
 *
 * Copyright (c) Cryptoapi developers.
 * 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 <crypto/md5.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/cryptohash.h>
#include <asm/byteorder.h>


const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = {
	0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,
	0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e,
};

EXPORT_SYMBOL_GPL(md5_zero_message_hash);

/* XXX: this stuff can be optimized */

static inline void le32_to_cpu_array(u32 *buf, unsigned int words) { while (words--) { __le32_to_cpus(buf); buf++; } }

Contributors

PersonTokensPropCommitsCommitProp
James Morris30100.00%3100.00%
Total30100.00%3100.00%


static inline void cpu_to_le32_array(u32 *buf, unsigned int words) { while (words--) { __cpu_to_le32s(buf); buf++; } }

Contributors

PersonTokensPropCommitsCommitProp
James Morris30100.00%3100.00%
Total30100.00%3100.00%


static inline void md5_transform_helper(struct md5_state *ctx) { le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); md5_transform(ctx->hash, ctx->block); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris4197.62%266.67%
Max Vozeler12.38%133.33%
Total42100.00%3100.00%


static int md5_init(struct shash_desc *desc) { struct md5_state *mctx = shash_desc_ctx(desc); mctx->hash[0] = MD5_H0; mctx->hash[1] = MD5_H1; mctx->hash[2] = MD5_H2; mctx->hash[3] = MD5_H3; mctx->byte_count = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris5075.76%120.00%
Adrian-Ken Rueegsegger812.12%120.00%
Corentin Labbe46.06%120.00%
Herbert Xu34.55%120.00%
Max Vozeler11.52%120.00%
Total66100.00%5100.00%


static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct md5_state *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); md5_transform_helper(mctx); data += avail; len -= avail; while (len >= sizeof(mctx->block)) { memcpy(mctx->block, data, sizeof(mctx->block)); md5_transform_helper(mctx); data += sizeof(mctx->block); len -= sizeof(mctx->block); } memcpy(mctx->block, data, len); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris18292.39%350.00%
Adrian-Ken Rueegsegger115.58%116.67%
Herbert Xu31.52%116.67%
Max Vozeler10.51%116.67%
Total197100.00%6100.00%


static int md5_final(struct shash_desc *desc, u8 *out) { struct md5_state *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)); md5_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)); md5_transform(mctx->hash, mctx->block); cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32)); memcpy(out, mctx->hash, sizeof(mctx->hash)); memset(mctx, 0, sizeof(*mctx)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris21894.37%342.86%
Adrian-Ken Rueegsegger83.46%114.29%
Herbert Xu31.30%114.29%
Andrew Morton10.43%114.29%
Max Vozeler10.43%114.29%
Total231100.00%7100.00%


static int md5_export(struct shash_desc *desc, void *out) { struct md5_state *ctx = shash_desc_ctx(desc); memcpy(out, ctx, sizeof(*ctx)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Max Vozeler41100.00%1100.00%
Total41100.00%1100.00%


static int md5_import(struct shash_desc *desc, const void *in) { struct md5_state *ctx = shash_desc_ctx(desc); memcpy(ctx, in, sizeof(*ctx)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Max Vozeler42100.00%1100.00%
Total42100.00%1100.00%

static struct shash_alg alg = { .digestsize = MD5_DIGEST_SIZE, .init = md5_init, .update = md5_update, .final = md5_final, .export = md5_export, .import = md5_import, .descsize = sizeof(struct md5_state), .statesize = sizeof(struct md5_state), .base = { .cra_name = "md5", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = MD5_HMAC_BLOCK_SIZE, .cra_module = THIS_MODULE, } };
static int __init md5_mod_init(void) { return crypto_register_shash(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris1487.50%133.33%
Adrian-Ken Rueegsegger16.25%133.33%
Kamalesh Babulal16.25%133.33%
Total16100.00%3100.00%


static void __exit md5_mod_fini(void) { crypto_unregister_shash(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris1386.67%133.33%
Kamalesh Babulal16.67%133.33%
Adrian-Ken Rueegsegger16.67%133.33%
Total15100.00%3100.00%

module_init(md5_mod_init); module_exit(md5_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); MODULE_ALIAS_CRYPTO("md5");

Overall Contributors

PersonTokensPropCommitsCommitProp
James Morris64472.60%529.41%
Max Vozeler10111.39%15.88%
Adrian-Ken Rueegsegger556.20%15.88%
Corentin Labbe505.64%211.76%
Herbert Xu212.37%317.65%
David S. Miller60.68%211.76%
Kees Cook50.56%15.88%
Kamalesh Babulal40.45%15.88%
Andrew Morton10.11%15.88%
Total887100.00%17100.00%
Directory: crypto
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.