171 lines
4 KiB
C
171 lines
4 KiB
C
/*
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* Cryptographic API.
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*
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* MD5 Message Digest Algorithm (RFC1321).
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*
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* Derived from cryptoapi implementation, originally based on the
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* public domain implementation written by Colin Plumb in 1993.
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*
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* Copyright (c) Cryptoapi developers.
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <crypto/md5.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/cryptohash.h>
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#include <asm/byteorder.h>
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/* XXX: this stuff can be optimized */
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static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
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{
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while (words--) {
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__le32_to_cpus(buf);
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buf++;
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}
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}
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static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
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{
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while (words--) {
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__cpu_to_le32s(buf);
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buf++;
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}
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}
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static inline void md5_transform_helper(struct md5_state *ctx)
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{
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le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
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md5_transform(ctx->hash, ctx->block);
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}
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static int md5_init(struct shash_desc *desc)
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{
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struct md5_state *mctx = shash_desc_ctx(desc);
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mctx->hash[0] = 0x67452301;
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mctx->hash[1] = 0xefcdab89;
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mctx->hash[2] = 0x98badcfe;
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mctx->hash[3] = 0x10325476;
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mctx->byte_count = 0;
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return 0;
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}
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static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct md5_state *mctx = shash_desc_ctx(desc);
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const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
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mctx->byte_count += len;
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if (avail > len) {
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, len);
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return 0;
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}
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, avail);
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md5_transform_helper(mctx);
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data += avail;
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len -= avail;
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while (len >= sizeof(mctx->block)) {
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memcpy(mctx->block, data, sizeof(mctx->block));
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md5_transform_helper(mctx);
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data += sizeof(mctx->block);
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len -= sizeof(mctx->block);
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}
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memcpy(mctx->block, data, len);
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return 0;
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}
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static int md5_final(struct shash_desc *desc, u8 *out)
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{
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struct md5_state *mctx = shash_desc_ctx(desc);
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const unsigned int offset = mctx->byte_count & 0x3f;
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char *p = (char *)mctx->block + offset;
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int padding = 56 - (offset + 1);
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*p++ = 0x80;
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if (padding < 0) {
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memset(p, 0x00, padding + sizeof (u64));
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md5_transform_helper(mctx);
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p = (char *)mctx->block;
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padding = 56;
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}
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memset(p, 0, padding);
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mctx->block[14] = mctx->byte_count << 3;
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mctx->block[15] = mctx->byte_count >> 29;
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le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
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sizeof(u64)) / sizeof(u32));
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md5_transform(mctx->hash, mctx->block);
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cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
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memcpy(out, mctx->hash, sizeof(mctx->hash));
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memset(mctx, 0, sizeof(*mctx));
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return 0;
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}
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static int md5_export(struct shash_desc *desc, void *out)
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{
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struct md5_state *ctx = shash_desc_ctx(desc);
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memcpy(out, ctx, sizeof(*ctx));
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return 0;
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}
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static int md5_import(struct shash_desc *desc, const void *in)
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{
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struct md5_state *ctx = shash_desc_ctx(desc);
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memcpy(ctx, in, sizeof(*ctx));
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return 0;
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}
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static struct shash_alg alg = {
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.digestsize = MD5_DIGEST_SIZE,
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.init = md5_init,
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.update = md5_update,
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.final = md5_final,
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.export = md5_export,
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.import = md5_import,
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.descsize = sizeof(struct md5_state),
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.statesize = sizeof(struct md5_state),
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.base = {
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.cra_name = "md5",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init md5_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit md5_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(md5_mod_init);
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module_exit(md5_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
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MODULE_ALIAS_CRYPTO("md5");
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