Reimplement crypto/md5.c on top of the new MD5 library functions. Also
add support for HMAC-MD5, again just wrapping the library functions.
This closely mirrors crypto/sha1.c.
Signed-off-by: Eric Biggers <ebigg...@kernel.org>
---
crypto/Kconfig | 2 +-
crypto/md5.c | 359 ++++++++++++++++++--------------------
crypto/testmgr.c | 3 +
drivers/crypto/img-hash.c | 2 +-
4 files changed, 171 insertions(+), 195 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 23bd98981ae8e..331c4fbb158b2 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -937,11 +937,11 @@ config CRYPTO_MD4
config CRYPTO_MD5
tristate "MD5"
select CRYPTO_HASH
help
- MD5 message digest algorithm (RFC1321)
+ MD5 message digest algorithm (RFC1321), including HMAC support.
config CRYPTO_MICHAEL_MIC
tristate "Michael MIC"
select CRYPTO_HASH
help
diff --git a/crypto/md5.c b/crypto/md5.c
index 32c0819f51185..d05c53e6f3c2c 100644
--- a/crypto/md5.c
+++ b/crypto/md5.c
@@ -1,224 +1,197 @@
-/*
- * 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 <jmor...@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;
+}
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);
-#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)
+#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_register_shash(&alg);
+ return __crypto_md5_export(&HMAC_MD5_CTX(desc)->hash_ctx, out);
}
-static void __exit md5_mod_fini(void)
+static int crypto_hmac_md5_import(struct shash_desc *desc, const void *in)
{
- crypto_unregister_shash(&alg);
+ 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);
}
-module_init(md5_mod_init);
-module_exit(md5_mod_fini);
+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,
+ .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,
+ .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");
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index ee33ba21ae2bc..beab926ba102e 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4176,10 +4176,11 @@ static const struct alg_test_desc alg_test_descs[] = {
.suite = {
.cprng = __VECS(ansi_cprng_aes_tv_template)
}
}, {
.alg = "authenc(hmac(md5),ecb(cipher_null))",
+ .generic_driver = "authenc(hmac-md5-lib,ecb-cipher_null)",
.test = alg_test_aead,
.suite = {
.aead = __VECS(hmac_md5_ecb_cipher_null_tv_template)
}
}, {
@@ -5062,10 +5063,11 @@ static const struct alg_test_desc alg_test_descs[] = {
.suite = {
.cipher = __VECS(aes_hctr2_tv_template)
}
}, {
.alg = "hmac(md5)",
+ .generic_driver = "hmac-md5-lib",
.test = alg_test_hash,
.suite = {
.hash = __VECS(hmac_md5_tv_template)
}
}, {
@@ -5248,10 +5250,11 @@ static const struct alg_test_desc alg_test_descs[] = {
.suite = {
.hash = __VECS(md4_tv_template)
}
}, {
.alg = "md5",
+ .generic_driver = "md5-lib",
.test = alg_test_hash,
.suite = {
.hash = __VECS(md5_tv_template)
}
}, {
diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index 76b7ecb5624b1..f22c12e36b56c 100644
--- a/drivers/crypto/img-hash.c
+++ b/drivers/crypto/img-hash.c
@@ -698,11 +698,11 @@ static int img_hash_cra_init(struct crypto_tfm *tfm,
const char *alg_name)
return 0;
}
static int img_hash_cra_md5_init(struct crypto_tfm *tfm)
{
- return img_hash_cra_init(tfm, "md5-generic");
+ return img_hash_cra_init(tfm, "md5-lib");
}
static int img_hash_cra_sha1_init(struct crypto_tfm *tfm)
{
return img_hash_cra_init(tfm, "sha1-lib");
--
2.50.1
