diff options
Diffstat (limited to 'crypto/md5.c')
| -rw-r--r-- | crypto/md5.c | 398 |
1 files changed, 205 insertions, 193 deletions
diff --git a/crypto/md5.c b/crypto/md5.c index 32c0819f5118..c167d203c710 100644 --- a/crypto/md5.c +++ b/crypto/md5.c @@ -1,25 +1,62 @@ -/* - * 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. +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Crypto API support for MD5 and HMAC-MD5 * + * Copyright 2025 Google LLC */ #include <crypto/internal/hash.h> #include <crypto/md5.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/string.h> + +/* + * Export and import functions. crypto_shash wants a particular format that + * matches that used by some legacy drivers. It currently is the same as the + * library MD5 context, except the value in bytecount must be block-aligned and + * the remainder must be stored in an extra u8 appended to the struct. + */ + +#define MD5_SHASH_STATE_SIZE (sizeof(struct md5_ctx) + 1) +static_assert(sizeof(struct md5_ctx) == sizeof(struct md5_state)); +static_assert(offsetof(struct md5_ctx, state) == offsetof(struct md5_state, hash)); +static_assert(offsetof(struct md5_ctx, bytecount) == offsetof(struct md5_state, byte_count)); +static_assert(offsetof(struct md5_ctx, buf) == offsetof(struct md5_state, block)); + +static int __crypto_md5_export(const struct md5_ctx *ctx0, void *out) +{ + struct md5_ctx ctx = *ctx0; + unsigned int partial; + u8 *p = out; + + partial = ctx.bytecount % MD5_BLOCK_SIZE; + ctx.bytecount -= partial; + memcpy(p, &ctx, sizeof(ctx)); + p += sizeof(ctx); + *p = partial; + return 0; +} + +static int __crypto_md5_import(struct md5_ctx *ctx, const void *in) +{ + const u8 *p = in; + + memcpy(ctx, p, sizeof(*ctx)); + p += sizeof(*ctx); + ctx->bytecount += *p; + return 0; +} + +static int __crypto_md5_export_core(const struct md5_ctx *ctx, void *out) +{ + memcpy(out, ctx, offsetof(struct md5_ctx, buf)); + return 0; +} + +static int __crypto_md5_import_core(struct md5_ctx *ctx, const void *in) +{ + memcpy(ctx, in, offsetof(struct md5_ctx, buf)); + return 0; +} const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = { 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, @@ -27,198 +64,173 @@ const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = { }; EXPORT_SYMBOL_GPL(md5_zero_message_hash); -#define F1(x, y, z) (z ^ (x & (y ^ z))) -#define F2(x, y, z) F1(z, x, y) -#define F3(x, y, z) (x ^ y ^ z) -#define F4(x, y, z) (y ^ (x | ~z)) - -#define MD5STEP(f, w, x, y, z, in, s) \ - (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x) - -static void md5_transform(__u32 *hash, __u32 const *in) -{ - u32 a, b, c, d; - - a = hash[0]; - b = hash[1]; - c = hash[2]; - d = hash[3]; - - MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); - MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); - MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); - MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); - MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); - MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); - MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); - MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); - MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); - MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); - MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); - MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); - MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); - MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); - MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); - MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); - - MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); - MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); - MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); - MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); - MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); - MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); - MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); - MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); - MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); - MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); - MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); - MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); - MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); - MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); - MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); - MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); - - MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); - MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); - MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); - MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); - MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); - MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); - MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); - MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); - MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); - MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); - MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); - MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); - MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); - MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); - MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); - MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); - - MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); - MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); - MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); - MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); - MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); - MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); - MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); - MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); - MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); - MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); - MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); - MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); - MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); - MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); - MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); - MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); - - hash[0] += a; - hash[1] += b; - hash[2] += c; - hash[3] += d; -} - -static inline void md5_transform_helper(struct md5_state *ctx, - u32 block[MD5_BLOCK_WORDS]) -{ - le32_to_cpu_array(block, MD5_BLOCK_WORDS); - md5_transform(ctx->hash, block); -} - -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; +#define MD5_CTX(desc) ((struct md5_ctx *)shash_desc_ctx(desc)) +static int crypto_md5_init(struct shash_desc *desc) +{ + md5_init(MD5_CTX(desc)); return 0; } -static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) -{ - struct md5_state *mctx = shash_desc_ctx(desc); - u32 block[MD5_BLOCK_WORDS]; - - mctx->byte_count += len; - do { - memcpy(block, data, sizeof(block)); - md5_transform_helper(mctx, block); - data += sizeof(block); - len -= sizeof(block); - } while (len >= sizeof(block)); - memzero_explicit(block, sizeof(block)); - mctx->byte_count -= len; - return len; -} - -static int md5_finup(struct shash_desc *desc, const u8 *data, unsigned int len, - u8 *out) -{ - struct md5_state *mctx = shash_desc_ctx(desc); - u32 block[MD5_BLOCK_WORDS]; - unsigned int offset; - int padding; - char *p; - - memcpy(block, data, len); - - offset = len; - p = (char *)block + offset; - padding = 56 - (offset + 1); - - *p++ = 0x80; - if (padding < 0) { - memset(p, 0x00, padding + sizeof (u64)); - md5_transform_helper(mctx, block); - p = (char *)block; - padding = 56; - } - - memset(p, 0, padding); - mctx->byte_count += len; - block[14] = mctx->byte_count << 3; - block[15] = mctx->byte_count >> 29; - le32_to_cpu_array(block, (sizeof(block) - sizeof(u64)) / sizeof(u32)); - md5_transform(mctx->hash, block); - memzero_explicit(block, sizeof(block)); - cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32)); - memcpy(out, mctx->hash, sizeof(mctx->hash)); +static int crypto_md5_update(struct shash_desc *desc, + const u8 *data, unsigned int len) +{ + md5_update(MD5_CTX(desc), data, len); + return 0; +} +static int crypto_md5_final(struct shash_desc *desc, u8 *out) +{ + md5_final(MD5_CTX(desc), out); return 0; } -static struct shash_alg alg = { - .digestsize = MD5_DIGEST_SIZE, - .init = md5_init, - .update = md5_update, - .finup = md5_finup, - .descsize = MD5_STATE_SIZE, - .base = { - .cra_name = "md5", - .cra_driver_name = "md5-generic", - .cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY, - .cra_blocksize = MD5_HMAC_BLOCK_SIZE, - .cra_module = THIS_MODULE, - } -}; +static int crypto_md5_digest(struct shash_desc *desc, + const u8 *data, unsigned int len, u8 *out) +{ + md5(data, len, out); + return 0; +} + +static int crypto_md5_export(struct shash_desc *desc, void *out) +{ + return __crypto_md5_export(MD5_CTX(desc), out); +} + +static int crypto_md5_import(struct shash_desc *desc, const void *in) +{ + return __crypto_md5_import(MD5_CTX(desc), in); +} -static int __init md5_mod_init(void) +static int crypto_md5_export_core(struct shash_desc *desc, void *out) { - return crypto_register_shash(&alg); + return __crypto_md5_export_core(MD5_CTX(desc), out); } -static void __exit md5_mod_fini(void) +static int crypto_md5_import_core(struct shash_desc *desc, const void *in) { - crypto_unregister_shash(&alg); + return __crypto_md5_import_core(MD5_CTX(desc), in); } -module_init(md5_mod_init); -module_exit(md5_mod_fini); +#define HMAC_MD5_KEY(tfm) ((struct hmac_md5_key *)crypto_shash_ctx(tfm)) +#define HMAC_MD5_CTX(desc) ((struct hmac_md5_ctx *)shash_desc_ctx(desc)) + +static int crypto_hmac_md5_setkey(struct crypto_shash *tfm, + const u8 *raw_key, unsigned int keylen) +{ + hmac_md5_preparekey(HMAC_MD5_KEY(tfm), raw_key, keylen); + return 0; +} + +static int crypto_hmac_md5_init(struct shash_desc *desc) +{ + hmac_md5_init(HMAC_MD5_CTX(desc), HMAC_MD5_KEY(desc->tfm)); + return 0; +} + +static int crypto_hmac_md5_update(struct shash_desc *desc, + const u8 *data, unsigned int len) +{ + hmac_md5_update(HMAC_MD5_CTX(desc), data, len); + return 0; +} + +static int crypto_hmac_md5_final(struct shash_desc *desc, u8 *out) +{ + hmac_md5_final(HMAC_MD5_CTX(desc), out); + return 0; +} + +static int crypto_hmac_md5_digest(struct shash_desc *desc, + const u8 *data, unsigned int len, u8 *out) +{ + hmac_md5(HMAC_MD5_KEY(desc->tfm), data, len, out); + return 0; +} + +static int crypto_hmac_md5_export(struct shash_desc *desc, void *out) +{ + return __crypto_md5_export(&HMAC_MD5_CTX(desc)->hash_ctx, out); +} + +static int crypto_hmac_md5_import(struct shash_desc *desc, const void *in) +{ + struct hmac_md5_ctx *ctx = HMAC_MD5_CTX(desc); + + ctx->ostate = HMAC_MD5_KEY(desc->tfm)->ostate; + return __crypto_md5_import(&ctx->hash_ctx, in); +} + +static int crypto_hmac_md5_export_core(struct shash_desc *desc, void *out) +{ + return __crypto_md5_export_core(&HMAC_MD5_CTX(desc)->hash_ctx, out); +} + +static int crypto_hmac_md5_import_core(struct shash_desc *desc, const void *in) +{ + struct hmac_md5_ctx *ctx = HMAC_MD5_CTX(desc); + + ctx->ostate = HMAC_MD5_KEY(desc->tfm)->ostate; + return __crypto_md5_import_core(&ctx->hash_ctx, in); +} + +static struct shash_alg algs[] = { + { + .base.cra_name = "md5", + .base.cra_driver_name = "md5-lib", + .base.cra_priority = 300, + .base.cra_blocksize = MD5_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, + .digestsize = MD5_DIGEST_SIZE, + .init = crypto_md5_init, + .update = crypto_md5_update, + .final = crypto_md5_final, + .digest = crypto_md5_digest, + .export = crypto_md5_export, + .import = crypto_md5_import, + .export_core = crypto_md5_export_core, + .import_core = crypto_md5_import_core, + .descsize = sizeof(struct md5_ctx), + .statesize = MD5_SHASH_STATE_SIZE, + }, + { + .base.cra_name = "hmac(md5)", + .base.cra_driver_name = "hmac-md5-lib", + .base.cra_priority = 300, + .base.cra_blocksize = MD5_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct hmac_md5_key), + .base.cra_module = THIS_MODULE, + .digestsize = MD5_DIGEST_SIZE, + .setkey = crypto_hmac_md5_setkey, + .init = crypto_hmac_md5_init, + .update = crypto_hmac_md5_update, + .final = crypto_hmac_md5_final, + .digest = crypto_hmac_md5_digest, + .export = crypto_hmac_md5_export, + .import = crypto_hmac_md5_import, + .export_core = crypto_hmac_md5_export_core, + .import_core = crypto_hmac_md5_import_core, + .descsize = sizeof(struct hmac_md5_ctx), + .statesize = MD5_SHASH_STATE_SIZE, + }, +}; + +static int __init crypto_md5_mod_init(void) +{ + return crypto_register_shashes(algs, ARRAY_SIZE(algs)); +} +module_init(crypto_md5_mod_init); + +static void __exit crypto_md5_mod_exit(void) +{ + crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); +} +module_exit(crypto_md5_mod_exit); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); +MODULE_DESCRIPTION("Crypto API support for MD5 and HMAC-MD5"); + MODULE_ALIAS_CRYPTO("md5"); +MODULE_ALIAS_CRYPTO("md5-lib"); +MODULE_ALIAS_CRYPTO("hmac(md5)"); +MODULE_ALIAS_CRYPTO("hmac-md5-lib"); |