Add library functions for MD5, including HMAC support. The MD5
implementation is derived from crypto/md5.c. This closely mirrors the
corresponding SHA-1 and SHA-2 changes; however, support for architecture
optimized MD5 implementations isn't included since it is unnecessary.
While MD5 is an insecure legacy algorithm, it still has various
in-kernel users that implement legacy protocols. Switching to a simple
library API, which is the way the code should have been organized
originally, will greatly simplify their code. For example:
MD5:
drivers/md/dm-crypt.c (for lmk IV generation)
fs/nfsd/nfs4recover.c
fs/ecryptfs/
fs/smb/client/
net/{ipv4,ipv6}/ (for TCP-MD5 signatures)
HMAC-MD5:
fs/smb/client/
fs/smb/server/
(Also net/sctp/ if it continues using HMAC-MD5 for cookie generation.
However, that use case has the flexibility to upgrade to a more modern
algorithm, which I'll be proposing instead.)
As usual, the "md5" and "hmac(md5)" crypto_shash algorithms will also be
reimplemented on top of these library functions. For "hmac(md5)" this
will provide a faster, more streamlined implementation.
Signed-off-by: Eric Biggers <ebigg...@kernel.org>
---
include/crypto/md5.h | 181 ++++++++++++++++++++++++++-
lib/crypto/Kconfig | 6 +
lib/crypto/Makefile | 3 +
lib/crypto/md5.c | 290 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 479 insertions(+), 1 deletion(-)
create mode 100644 lib/crypto/md5.c
diff --git a/include/crypto/md5.h b/include/crypto/md5.h
index 28ee533a0507a..d8e4d3c7c0369 100644
--- a/include/crypto/md5.h
+++ b/include/crypto/md5.h
@@ -5,10 +5,11 @@
#include <crypto/hash.h>
#include <linux/types.h>
#define MD5_DIGEST_SIZE 16
#define MD5_HMAC_BLOCK_SIZE 64
+#define MD5_BLOCK_SIZE 64
#define MD5_BLOCK_WORDS 16
#define MD5_HASH_WORDS 4
#define MD5_STATE_SIZE 24
#define MD5_H0 0x67452301UL
@@ -25,6 +26,184 @@ struct md5_state {
u32 hash[MD5_HASH_WORDS];
u64 byte_count;
u32 block[MD5_BLOCK_WORDS];
};
-#endif
+/* State for the MD5 compression function */
+struct md5_block_state {
+ u32 h[MD5_HASH_WORDS];
+};
+
+/**
+ * struct md5_ctx - Context for hashing a message with MD5
+ * @state: the compression function state
+ * @bytecount: number of bytes processed so far
+ * @buf: partial block buffer; bytecount % MD5_BLOCK_SIZE bytes are valid
+ */
+struct md5_ctx {
+ struct md5_block_state state;
+ u64 bytecount;
+ u8 buf[MD5_BLOCK_SIZE] __aligned(__alignof__(__le64));
+};
+
+/**
+ * md5_init() - Initialize an MD5 context for a new message
+ * @ctx: the context to initialize
+ *
+ * If you don't need incremental computation, consider md5() instead.
+ *
+ * Context: Any context.
+ */
+void md5_init(struct md5_ctx *ctx);
+
+/**
+ * md5_update() - Update an MD5 context with message data
+ * @ctx: the context to update; must have been initialized
+ * @data: the message data
+ * @len: the data length in bytes
+ *
+ * This can be called any number of times.
+ *
+ * Context: Any context.
+ */
+void md5_update(struct md5_ctx *ctx, const u8 *data, size_t len);
+
+/**
+ * md5_final() - Finish computing an MD5 message digest
+ * @ctx: the context to finalize; must have been initialized
+ * @out: (output) the resulting MD5 message digest
+ *
+ * After finishing, this zeroizes @ctx. So the caller does not need to do it.
+ *
+ * Context: Any context.
+ */
+void md5_final(struct md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE]);
+
+/**
+ * md5() - Compute MD5 message digest in one shot
+ * @data: the message data
+ * @len: the data length in bytes
+ * @out: (output) the resulting MD5 message digest
+ *
+ * Context: Any context.
+ */
+void md5(const u8 *data, size_t len, u8 out[MD5_DIGEST_SIZE]);
+
+/**
+ * struct hmac_md5_key - Prepared key for HMAC-MD5
+ * @istate: private
+ * @ostate: private
+ */
+struct hmac_md5_key {
+ struct md5_block_state istate;
+ struct md5_block_state ostate;
+};
+
+/**
+ * struct hmac_md5_ctx - Context for computing HMAC-MD5 of a message
+ * @hash_ctx: private
+ * @ostate: private
+ */
+struct hmac_md5_ctx {
+ struct md5_ctx hash_ctx;
+ struct md5_block_state ostate;
+};
+
+/**
+ * hmac_md5_preparekey() - Prepare a key for HMAC-MD5
+ * @key: (output) the key structure to initialize
+ * @raw_key: the raw HMAC-MD5 key
+ * @raw_key_len: the key length in bytes. All key lengths are supported.
+ *
+ * Note: the caller is responsible for zeroizing both the struct hmac_md5_key
+ * and the raw key once they are no longer needed.
+ *
+ * Context: Any context.
+ */
+void hmac_md5_preparekey(struct hmac_md5_key *key,
+ const u8 *raw_key, size_t raw_key_len);
+
+/**
+ * hmac_md5_init() - Initialize an HMAC-MD5 context for a new message
+ * @ctx: (output) the HMAC context to initialize
+ * @key: the prepared HMAC key
+ *
+ * If you don't need incremental computation, consider hmac_md5() instead.
+ *
+ * Context: Any context.
+ */
+void hmac_md5_init(struct hmac_md5_ctx *ctx, const struct hmac_md5_key *key);
+
+/**
+ * hmac_md5_init_usingrawkey() - Initialize an HMAC-MD5 context for a new
+ * message, using a raw key
+ * @ctx: (output) the HMAC context to initialize
+ * @raw_key: the raw HMAC-MD5 key
+ * @raw_key_len: the key length in bytes. All key lengths are supported.
+ *
+ * If you don't need incremental computation, consider hmac_md5_usingrawkey()
+ * instead.
+ *
+ * Context: Any context.
+ */
+void hmac_md5_init_usingrawkey(struct hmac_md5_ctx *ctx,
+ const u8 *raw_key, size_t raw_key_len);
+
+/**
+ * hmac_md5_update() - Update an HMAC-MD5 context with message data
+ * @ctx: the HMAC context to update; must have been initialized
+ * @data: the message data
+ * @data_len: the data length in bytes
+ *
+ * This can be called any number of times.
+ *
+ * Context: Any context.
+ */
+static inline void hmac_md5_update(struct hmac_md5_ctx *ctx,
+ const u8 *data, size_t data_len)
+{
+ md5_update(&ctx->hash_ctx, data, data_len);
+}
+
+/**
+ * hmac_md5_final() - Finish computing an HMAC-MD5 value
+ * @ctx: the HMAC context to finalize; must have been initialized
+ * @out: (output) the resulting HMAC-MD5 value
+ *
+ * After finishing, this zeroizes @ctx. So the caller does not need to do it.
+ *
+ * Context: Any context.
+ */
+void hmac_md5_final(struct hmac_md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE]);
+
+/**
+ * hmac_md5() - Compute HMAC-MD5 in one shot, using a prepared key
+ * @key: the prepared HMAC key
+ * @data: the message data
+ * @data_len: the data length in bytes
+ * @out: (output) the resulting HMAC-MD5 value
+ *
+ * If you're using the key only once, consider using hmac_md5_usingrawkey().
+ *
+ * Context: Any context.
+ */
+void hmac_md5(const struct hmac_md5_key *key, const u8 *data, size_t data_len,
+ u8 out[MD5_DIGEST_SIZE]);
+
+/**
+ * hmac_md5_usingrawkey() - Compute HMAC-MD5 in one shot, using a raw key
+ * @raw_key: the raw HMAC-MD5 key
+ * @raw_key_len: the key length in bytes. All key lengths are supported.
+ * @data: the message data
+ * @data_len: the data length in bytes
+ * @out: (output) the resulting HMAC-MD5 value
+ *
+ * If you're using the key multiple times, prefer to use hmac_md5_preparekey()
+ * followed by multiple calls to hmac_md5() instead.
+ *
+ * Context: Any context.
+ */
+void hmac_md5_usingrawkey(const u8 *raw_key, size_t raw_key_len,
+ const u8 *data, size_t data_len,
+ u8 out[MD5_DIGEST_SIZE]);
+
+#endif /* _CRYPTO_MD5_H */
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig
index c2b65b6a9bb6f..f1b2a51450df2 100644
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -99,10 +99,16 @@ config CRYPTO_LIB_CURVE25519
one, if one is available and enabled.
config CRYPTO_LIB_DES
tristate
+config CRYPTO_LIB_MD5
+ tristate
+ help
+ The MD5 and HMAC-MD5 library functions. Select this if your module
+ uses any of the functions from <crypto/md5.h>.
+
config CRYPTO_LIB_POLY1305_RSIZE
int
default 2 if MIPS
default 11 if X86_64
default 9 if ARM || ARM64
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index e4151be2ebd44..252480ab97e9c 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -57,10 +57,13 @@ libcurve25519-y +=
curve25519.o
libcurve25519-$(CONFIG_CRYPTO_SELFTESTS) += curve25519-selftest.o
obj-$(CONFIG_CRYPTO_LIB_DES) += libdes.o
libdes-y := des.o
+obj-$(CONFIG_CRYPTO_LIB_MD5) += libmd5.o
+libmd5-y := md5.o
+
obj-$(CONFIG_CRYPTO_LIB_POLY1305) += libpoly1305.o
libpoly1305-y += poly1305.o
obj-$(CONFIG_CRYPTO_LIB_POLY1305_GENERIC) += libpoly1305-generic.o
libpoly1305-generic-y := poly1305-donna32.o
diff --git a/lib/crypto/md5.c b/lib/crypto/md5.c
new file mode 100644
index 0000000000000..17323340963b5
--- /dev/null
+++ b/lib/crypto/md5.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MD5 and HMAC-MD5 library functions
+ *
+ * md5_transform() is 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>
+ * Copyright 2025 Google LLC
+ */
+
+#include <crypto/hmac.h>
+#include <crypto/md5.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/unaligned.h>
+#include <linux/wordpart.h>
+
+static const struct md5_block_state md5_iv = {
+ .h = { MD5_H0, MD5_H1, MD5_H2, MD5_H3 },
+};
+
+#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(struct md5_block_state *state,
+ const u8 data[MD5_BLOCK_SIZE])
+{
+ u32 in[MD5_BLOCK_WORDS];
+ u32 a, b, c, d;
+
+ memcpy(in, data, MD5_BLOCK_SIZE);
+ le32_to_cpu_array(in, ARRAY_SIZE(in));
+
+ a = state->h[0];
+ b = state->h[1];
+ c = state->h[2];
+ d = state->h[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);
+
+ state->h[0] += a;
+ state->h[1] += b;
+ state->h[2] += c;
+ state->h[3] += d;
+}
+
+void md5_init(struct md5_ctx *ctx)
+{
+ ctx->state = md5_iv;
+ ctx->bytecount = 0;
+}
+EXPORT_SYMBOL_GPL(md5_init);
+
+void md5_update(struct md5_ctx *ctx, const u8 *data, size_t len)
+{
+ size_t partial = ctx->bytecount % MD5_BLOCK_SIZE;
+
+ ctx->bytecount += len;
+
+ if (partial + len >= MD5_BLOCK_SIZE) {
+
+ if (partial) {
+ size_t l = MD5_BLOCK_SIZE - partial;
+
+ memcpy(&ctx->buf[partial], data, l);
+ data += l;
+ len -= l;
+
+ md5_transform(&ctx->state, ctx->buf);
+ }
+
+ while (len >= MD5_BLOCK_SIZE) {
+ md5_transform(&ctx->state, data);
+ data += MD5_BLOCK_SIZE;
+ len -= MD5_BLOCK_SIZE;
+ }
+ partial = 0;
+ }
+ if (len)
+ memcpy(&ctx->buf[partial], data, len);
+}
+EXPORT_SYMBOL_GPL(md5_update);
+
+static void __md5_final(struct md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE])
+{
+ u64 bitcount = ctx->bytecount << 3;
+ size_t partial = ctx->bytecount % MD5_BLOCK_SIZE;
+
+ ctx->buf[partial++] = 0x80;
+ if (partial > MD5_BLOCK_SIZE - 8) {
+ memset(&ctx->buf[partial], 0, MD5_BLOCK_SIZE - partial);
+ md5_transform(&ctx->state, ctx->buf);
+ partial = 0;
+ }
+ memset(&ctx->buf[partial], 0, MD5_BLOCK_SIZE - 8 - partial);
+ *(__le64 *)&ctx->buf[MD5_BLOCK_SIZE - 8] = cpu_to_le64(bitcount);
+ md5_transform(&ctx->state, ctx->buf);
+
+ cpu_to_le32_array(ctx->state.h, ARRAY_SIZE(ctx->state.h));
+ memcpy(out, ctx->state.h, MD5_DIGEST_SIZE);
+}
+
+void md5_final(struct md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE])
+{
+ __md5_final(ctx, out);
+ memzero_explicit(ctx, sizeof(*ctx));
+}
+EXPORT_SYMBOL_GPL(md5_final);
+
+void md5(const u8 *data, size_t len, u8 out[MD5_DIGEST_SIZE])
+{
+ struct md5_ctx ctx;
+
+ md5_init(&ctx);
+ md5_update(&ctx, data, len);
+ md5_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(md5);
+
+static void __hmac_md5_preparekey(struct md5_block_state *istate,
+ struct md5_block_state *ostate,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ union {
+ u8 b[MD5_BLOCK_SIZE];
+ unsigned long w[MD5_BLOCK_SIZE / sizeof(unsigned long)];
+ } derived_key = { 0 };
+
+ if (unlikely(raw_key_len > MD5_BLOCK_SIZE))
+ md5(raw_key, raw_key_len, derived_key.b);
+ else
+ memcpy(derived_key.b, raw_key, raw_key_len);
+
+ for (size_t i = 0; i < ARRAY_SIZE(derived_key.w); i++)
+ derived_key.w[i] ^= REPEAT_BYTE(HMAC_IPAD_VALUE);
+ *istate = md5_iv;
+ md5_transform(istate, derived_key.b);
+
+ for (size_t i = 0; i < ARRAY_SIZE(derived_key.w); i++)
+ derived_key.w[i] ^= REPEAT_BYTE(HMAC_OPAD_VALUE ^
+ HMAC_IPAD_VALUE);
+ *ostate = md5_iv;
+ md5_transform(ostate, derived_key.b);
+
+ memzero_explicit(&derived_key, sizeof(derived_key));
+}
+
+void hmac_md5_preparekey(struct hmac_md5_key *key,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ __hmac_md5_preparekey(&key->istate, &key->ostate, raw_key, raw_key_len);
+}
+EXPORT_SYMBOL_GPL(hmac_md5_preparekey);
+
+void hmac_md5_init(struct hmac_md5_ctx *ctx, const struct hmac_md5_key *key)
+{
+ ctx->hash_ctx.state = key->istate;
+ ctx->hash_ctx.bytecount = MD5_BLOCK_SIZE;
+ ctx->ostate = key->ostate;
+}
+EXPORT_SYMBOL_GPL(hmac_md5_init);
+
+void hmac_md5_init_usingrawkey(struct hmac_md5_ctx *ctx,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ __hmac_md5_preparekey(&ctx->hash_ctx.state, &ctx->ostate,
+ raw_key, raw_key_len);
+ ctx->hash_ctx.bytecount = MD5_BLOCK_SIZE;
+}
+EXPORT_SYMBOL_GPL(hmac_md5_init_usingrawkey);
+
+void hmac_md5_final(struct hmac_md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE])
+{
+ /* Generate the padded input for the outer hash in ctx->hash_ctx.buf. */
+ __md5_final(&ctx->hash_ctx, ctx->hash_ctx.buf);
+ memset(&ctx->hash_ctx.buf[MD5_DIGEST_SIZE], 0,
+ MD5_BLOCK_SIZE - MD5_DIGEST_SIZE);
+ ctx->hash_ctx.buf[MD5_DIGEST_SIZE] = 0x80;
+ *(__le64 *)&ctx->hash_ctx.buf[MD5_BLOCK_SIZE - 8] =
+ cpu_to_le64(8 * (MD5_BLOCK_SIZE + MD5_DIGEST_SIZE));
+
+ /* Compute the outer hash, which gives the HMAC value. */
+ md5_transform(&ctx->ostate, ctx->hash_ctx.buf);
+ cpu_to_le32_array(ctx->ostate.h, ARRAY_SIZE(ctx->ostate.h));
+ memcpy(out, ctx->ostate.h, MD5_DIGEST_SIZE);
+
+ memzero_explicit(ctx, sizeof(*ctx));
+}
+EXPORT_SYMBOL_GPL(hmac_md5_final);
+
+void hmac_md5(const struct hmac_md5_key *key, const u8 *data, size_t data_len,
+ u8 out[MD5_DIGEST_SIZE])
+{
+ struct hmac_md5_ctx ctx;
+
+ hmac_md5_init(&ctx, key);
+ hmac_md5_update(&ctx, data, data_len);
+ hmac_md5_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(hmac_md5);
+
+void hmac_md5_usingrawkey(const u8 *raw_key, size_t raw_key_len,
+ const u8 *data, size_t data_len,
+ u8 out[MD5_DIGEST_SIZE])
+{
+ struct hmac_md5_ctx ctx;
+
+ hmac_md5_init_usingrawkey(&ctx, raw_key, raw_key_len);
+ hmac_md5_update(&ctx, data, data_len);
+ hmac_md5_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(hmac_md5_usingrawkey);
+
+MODULE_DESCRIPTION("MD5 and HMAC-MD5 library functions");
+MODULE_LICENSE("GPL");
--
2.50.1
