Add documentation warnings for weak algorithms
MD2, MD4, MD5, DES and SHA-1 are considered weak and their use
constitutes a security risk. If possible, we recommend avoiding
dependencies on them, and considering stronger message digests and
ciphers instead.
diff --git a/include/mbedtls/md4.h b/include/mbedtls/md4.h
index 886a669..a2ab57f 100644
--- a/include/mbedtls/md4.h
+++ b/include/mbedtls/md4.h
@@ -2,6 +2,10 @@
* \file md4.h
*
* \brief MD4 message digest algorithm (hash function)
+ *
+ * \warning MD4 is considered a weak message digest and its use constitutes a
+ * security risk. We recommend considering stronger message digests
+ * instead.
*/
/*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
@@ -20,6 +24,7 @@
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
+ *
*/
#ifndef MBEDTLS_MD4_H
#define MBEDTLS_MD4_H
@@ -50,6 +55,11 @@
/**
* \brief MD4 context structure
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
typedef struct
{
@@ -63,6 +73,11 @@
* \brief Initialize MD4 context
*
* \param ctx MD4 context to be initialized
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
void mbedtls_md4_init( mbedtls_md4_context *ctx );
@@ -70,6 +85,11 @@
* \brief Clear MD4 context
*
* \param ctx MD4 context to be cleared
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
void mbedtls_md4_free( mbedtls_md4_context *ctx );
@@ -78,6 +98,11 @@
*
* \param dst The destination context
* \param src The context to be cloned
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
void mbedtls_md4_clone( mbedtls_md4_context *dst,
const mbedtls_md4_context *src );
@@ -88,6 +113,10 @@
* \param ctx context to be initialized
*
* \return 0 if successful
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
*/
int mbedtls_md4_starts_ret( mbedtls_md4_context *ctx );
@@ -99,6 +128,11 @@
* \param ilen length of the input data
*
* \return 0 if successful
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
int mbedtls_md4_update_ret( mbedtls_md4_context *ctx,
const unsigned char *input,
@@ -111,6 +145,11 @@
* \param output MD4 checksum result
*
* \return 0 if successful
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
int mbedtls_md4_finish_ret( mbedtls_md4_context *ctx,
unsigned char output[16] );
@@ -122,6 +161,11 @@
* \param data buffer holding one block of data
*
* \return 0 if successful
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
int mbedtls_internal_md4_process( mbedtls_md4_context *ctx,
const unsigned char data[64] );
@@ -138,6 +182,11 @@
* \deprecated Superseded by mbedtls_md4_starts_ret() in 2.7.0
*
* \param ctx context to be initialized
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
MBEDTLS_DEPRECATED static inline void mbedtls_md4_starts(
mbedtls_md4_context *ctx )
@@ -153,6 +202,11 @@
* \param ctx MD4 context
* \param input buffer holding the data
* \param ilen length of the input data
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
MBEDTLS_DEPRECATED static inline void mbedtls_md4_update(
mbedtls_md4_context *ctx,
@@ -169,6 +223,11 @@
*
* \param ctx MD4 context
* \param output MD4 checksum result
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
MBEDTLS_DEPRECATED static inline void mbedtls_md4_finish(
mbedtls_md4_context *ctx,
@@ -184,6 +243,11 @@
*
* \param ctx MD4 context
* \param data buffer holding one block of data
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
MBEDTLS_DEPRECATED static inline void mbedtls_md4_process(
mbedtls_md4_context *ctx,
@@ -215,6 +279,11 @@
* \param output MD4 checksum result
*
* \return 0 if successful
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
int mbedtls_md4_ret( const unsigned char *input,
size_t ilen,
@@ -234,6 +303,11 @@
* \param input buffer holding the data
* \param ilen length of the input data
* \param output MD4 checksum result
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
MBEDTLS_DEPRECATED static inline void mbedtls_md4( const unsigned char *input,
size_t ilen,
@@ -249,6 +323,11 @@
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
+ *
+ * \warning MD4 is considered a weak message digest and its use
+ * constitutes a security risk. We recommend considering
+ * stronger message digests instead.
+ *
*/
int mbedtls_md4_self_test( int verbose );