* with every copy.
*
* ircuified 2002 by hikari
- *
- * $Id$
-*/
+ */
+/** @file
+ * @brief MD5 implementation for ircu.
+ * @version $Id$
+ */
#ifndef ircd_md5_h
#define ircd_md5_h
+/** Macro to prepend MD5 variant to a function name. */
#define MD5Name(x) Good##x
+/** Typedef for an unsigned 32-bit integer. */
typedef unsigned int uint32;
+/** MD5 context structure. */
struct MD5Context {
- uint32 buf[4];
- uint32 bits[2];
- unsigned char in[64];
+ uint32 buf[4]; /**< Current digest state/value. */
+ uint32 bits[2]; /**< Number of bits hashed so far. */
+ unsigned char in[64]; /**< Residual input buffer. */
};
void GoodMD5Init(struct MD5Context *);
char *Goodcrypt_md5(const char *pw, const char *salt);
char *Brokencrypt_md5(const char *pw, const char *salt);
-/*
- * This is needed to make RSAREF happy on some MS-DOS compilers.
- */
-
+/** Helper typedef for the MD5 context structure. */
typedef struct MD5Context MD5_CTX;
#endif /* ircd_md5_h */
#include "ircd_md5.h"
#ifndef HIGHFIRST
+/** Bit-reverse bytes in a buffer. */
#define byteReverse(buf, len) /* Nothing */
#else
static void byteReverse(unsigned char *buf, unsigned longs);
#endif
#endif
-/*
- * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
- * initialization constants.
+/** Iniitalize MD5 context.
+ * @param[out] ctx MD5 context to initialize.
*/
void MD5Name(MD5Init)(struct MD5Context *ctx)
{
ctx->bits[1] = 0;
}
-/*
- * Update context to reflect the concatenation of another buffer full
- * of bytes.
+/** Update MD5 context with data from a buffer.
+ * @param[in,out] ctx MD5 context to operate on.
+ * @param[in] buf Input buffer.
+ * @param[in] len Number of bytes in input buffer.
*/
void MD5Name(MD5Update)(struct MD5Context *ctx, unsigned const char *buf, unsigned len)
{
memcpy(ctx->in, buf, len);
}
-/*
- * Final wrapup - pad to 64-byte boundary with the bit pattern
- * 1 0* (64-bit count of bits processed, MSB-first)
+/** Perform final steps of MD5 hash.
+ * @param[out] digest Receives output hash value.
+ * @param[in,out] ctx MD5 context to finalize.
*/
void MD5Name(MD5Final)(unsigned char digest[16], struct MD5Context *ctx)
{
/* The four core functions - F1 is optimized somewhat */
/* #define F1(x, y, z) (x & y | ~x & z) */
+/** Helper function for first round of MD5. */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
+/** Helper function for second round of MD5. */
#define F2(x, y, z) F1(z, x, y)
+/** Helper function for third round of MD5. */
#define F3(x, y, z) (x ^ y ^ z)
+/** Helper function for fourth round of MD5. */
#define F4(x, y, z) (y ^ (x | ~z))
-/* This is the central step in the MD5 algorithm. */
+/** Step function for each round of MD5 */
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
-/*
- * The core of the MD5 algorithm, this alters an existing MD5 hash to
- * reflect the addition of 16 longwords of new data. MD5Update blocks
- * the data and converts bytes into longwords for this routine.
+/** Perform the core MD5 update steps to update a 128-bit hash value
+ * with 512 bits of input data.
+ * @param[in,out] buf Hash value.
+ * @param[in] in Input buffer.
*/
void MD5Name(MD5Transform)(uint32 buf[4], uint32 const in[16])
{