| /* |
| * 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/string.h> |
| #include <linux/types.h> |
| #include <linux/cryptohash.h> |
| #include <asm/byteorder.h> |
| |
| /* 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++; |
| } |
| } |
| |
| static inline void cpu_to_le32_array(u32 *buf, unsigned int words) |
| { |
| while (words--) { |
| __cpu_to_le32s(buf); |
| buf++; |
| } |
| } |
| |
| 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); |
| } |
| |
| static int md5_init(struct shash_desc *desc) |
| { |
| struct md5_state *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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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 = NULL, |
| } |
| }; |
| |
| static int __init md5_mod_init(void) |
| { |
| return crypto_register_shash(&alg); |
| } |
| |
| static void __exit md5_mod_fini(void) |
| { |
| crypto_unregister_shash(&alg); |
| } |
| |
| module_init(md5_mod_init); |
| module_exit(md5_mod_fini); |