lib/md5.c File Reference

#include "common.h"
#include "md5.h"

Include dependency graph for md5.c:

Go to the source code of this file.

Defines

#define GET_UINT32(n, b, i)
#define PUT_UINT32(n, b, i)
#define S(x, n)   ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
#define P(a, b, c, d, k, s, t)
#define F(x, y, z)   (z ^ (x & (y ^ z)))
#define F(x, y, z)   (y ^ (z & (x ^ y)))
#define F(x, y, z)   (x ^ y ^ z)
#define F(x, y, z)   (y ^ (x | ~z))

Functions

void md5_starts (struct md5_context *ctx)
void md5_process (struct md5_context *ctx, uint8 data[64])
void md5_update (struct md5_context *ctx, uint8 *input, uint32 length)
void md5_finish (struct md5_context *ctx, uint8 digest[16])

Variables

static char const rcsid [] = "$Id: md5.c,v 1.4 2003/05/06 07:33:43 kate Exp $"
static uint8 md5_padding [64]

Define Documentation

#define F ( x,
y,
z   )     (y ^ (x | ~z))

#define F ( x,
y,
z   )     (x ^ y ^ z)

#define F ( x,
y,
z   )     (y ^ (z & (x ^ y)))

#define F ( x,
y,
z   )     (z ^ (x & (y ^ z)))

#define GET_UINT32 ( n,
b,
i   ) 

Value:

{                                                               \
    (n) = (uint32) ((uint8 *) b)[(i)]                           \
      | (((uint32) ((uint8 *) b)[(i)+1]) <<  8)                 \
      | (((uint32) ((uint8 *) b)[(i)+2]) << 16)                 \
      | (((uint32) ((uint8 *) b)[(i)+3]) << 24);                \
}

Definition at line 12 of file md5.c.

Referenced by md5_process().

#define P ( a,
b,
c,
d,
k,
s,
t   ) 

Value:

{                                                       \
    a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \
}

Referenced by md5_process().

#define PUT_UINT32 ( n,
b,
i   ) 

Value:

{                                                               \
    (((uint8 *) b)[(i)]  ) = (uint8) (((n)      ) & 0xFF);      \
    (((uint8 *) b)[(i)+1]) = (uint8) (((n) >>  8) & 0xFF);      \
    (((uint8 *) b)[(i)+2]) = (uint8) (((n) >> 16) & 0xFF);      \
    (((uint8 *) b)[(i)+3]) = (uint8) (((n) >> 24) & 0xFF);      \
}

Definition at line 20 of file md5.c.

Referenced by md5_finish().

#define S ( x,
n   )     ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

Function Documentation

void md5_finish ( struct md5_context *  ctx,
uint8  digest[16] 
)

Definition at line 201 of file md5.c.

References md5_padding, md5_update(), PUT_UINT32, md5_context::total, uint32, and uint8.

00202 {
00203     uint32 last, padn;
00204     uint8 msglen[8];
00205 
00206     PUT_UINT32( (uint32) ((ctx->total <<  3) & 0xFFFFFFFF), msglen, 0 );
00207     PUT_UINT32( (uint32) ((ctx->total >> 29) & 0xFFFFFFFF), msglen, 4 );
00208 
00209     last = (uint32) (ctx->total & 0x3F);
00210     padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
00211 
00212     md5_update( ctx, md5_padding, padn );
00213     md5_update( ctx, msglen, 8 );
00214 
00215     PUT_UINT32( ctx->state[0], digest,  0 );
00216     PUT_UINT32( ctx->state[1], digest,  4 );
00217     PUT_UINT32( ctx->state[2], digest,  8 );
00218     PUT_UINT32( ctx->state[3], digest, 12 );
00219 }

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void md5_process ( struct md5_context *  ctx,
uint8  data[64] 
)

Definition at line 37 of file md5.c.

References GET_UINT32, P, md5_context::state, and uint32.

Referenced by md5_update().

00038 {
00039     uint32 A, B, C, D, X[16];
00040 
00041     GET_UINT32( X[0],  data,  0 );
00042     GET_UINT32( X[1],  data,  4 );
00043     GET_UINT32( X[2],  data,  8 );
00044     GET_UINT32( X[3],  data, 12 );
00045     GET_UINT32( X[4],  data, 16 );
00046     GET_UINT32( X[5],  data, 20 );
00047     GET_UINT32( X[6],  data, 24 );
00048     GET_UINT32( X[7],  data, 28 );
00049     GET_UINT32( X[8],  data, 32 );
00050     GET_UINT32( X[9],  data, 36 );
00051     GET_UINT32( X[10], data, 40 );
00052     GET_UINT32( X[11], data, 44 );
00053     GET_UINT32( X[12], data, 48 );
00054     GET_UINT32( X[13], data, 52 );
00055     GET_UINT32( X[14], data, 56 );
00056     GET_UINT32( X[15], data, 60 );
00057 
00058 #define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
00059 
00060 #define P(a,b,c,d,k,s,t)                                \
00061 {                                                       \
00062     a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \
00063 }
00064 
00065     A = ctx->state[0];
00066     B = ctx->state[1];
00067     C = ctx->state[2];
00068     D = ctx->state[3];
00069 
00070 #define F(x,y,z) (z ^ (x & (y ^ z)))
00071 
00072     P( A, B, C, D,  0,  7, 0xD76AA478 );
00073     P( D, A, B, C,  1, 12, 0xE8C7B756 );
00074     P( C, D, A, B,  2, 17, 0x242070DB );
00075     P( B, C, D, A,  3, 22, 0xC1BDCEEE );
00076     P( A, B, C, D,  4,  7, 0xF57C0FAF );
00077     P( D, A, B, C,  5, 12, 0x4787C62A );
00078     P( C, D, A, B,  6, 17, 0xA8304613 );
00079     P( B, C, D, A,  7, 22, 0xFD469501 );
00080     P( A, B, C, D,  8,  7, 0x698098D8 );
00081     P( D, A, B, C,  9, 12, 0x8B44F7AF );
00082     P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
00083     P( B, C, D, A, 11, 22, 0x895CD7BE );
00084     P( A, B, C, D, 12,  7, 0x6B901122 );
00085     P( D, A, B, C, 13, 12, 0xFD987193 );
00086     P( C, D, A, B, 14, 17, 0xA679438E );
00087     P( B, C, D, A, 15, 22, 0x49B40821 );
00088 
00089 #undef F
00090 
00091 #define F(x,y,z) (y ^ (z & (x ^ y)))
00092 
00093     P( A, B, C, D,  1,  5, 0xF61E2562 );
00094     P( D, A, B, C,  6,  9, 0xC040B340 );
00095     P( C, D, A, B, 11, 14, 0x265E5A51 );
00096     P( B, C, D, A,  0, 20, 0xE9B6C7AA );
00097     P( A, B, C, D,  5,  5, 0xD62F105D );
00098     P( D, A, B, C, 10,  9, 0x02441453 );
00099     P( C, D, A, B, 15, 14, 0xD8A1E681 );
00100     P( B, C, D, A,  4, 20, 0xE7D3FBC8 );
00101     P( A, B, C, D,  9,  5, 0x21E1CDE6 );
00102     P( D, A, B, C, 14,  9, 0xC33707D6 );
00103     P( C, D, A, B,  3, 14, 0xF4D50D87 );
00104     P( B, C, D, A,  8, 20, 0x455A14ED );
00105     P( A, B, C, D, 13,  5, 0xA9E3E905 );
00106     P( D, A, B, C,  2,  9, 0xFCEFA3F8 );
00107     P( C, D, A, B,  7, 14, 0x676F02D9 );
00108     P( B, C, D, A, 12, 20, 0x8D2A4C8A );
00109 
00110 #undef F
00111     
00112 #define F(x,y,z) (x ^ y ^ z)
00113 
00114     P( A, B, C, D,  5,  4, 0xFFFA3942 );
00115     P( D, A, B, C,  8, 11, 0x8771F681 );
00116     P( C, D, A, B, 11, 16, 0x6D9D6122 );
00117     P( B, C, D, A, 14, 23, 0xFDE5380C );
00118     P( A, B, C, D,  1,  4, 0xA4BEEA44 );
00119     P( D, A, B, C,  4, 11, 0x4BDECFA9 );
00120     P( C, D, A, B,  7, 16, 0xF6BB4B60 );
00121     P( B, C, D, A, 10, 23, 0xBEBFBC70 );
00122     P( A, B, C, D, 13,  4, 0x289B7EC6 );
00123     P( D, A, B, C,  0, 11, 0xEAA127FA );
00124     P( C, D, A, B,  3, 16, 0xD4EF3085 );
00125     P( B, C, D, A,  6, 23, 0x04881D05 );
00126     P( A, B, C, D,  9,  4, 0xD9D4D039 );
00127     P( D, A, B, C, 12, 11, 0xE6DB99E5 );
00128     P( C, D, A, B, 15, 16, 0x1FA27CF8 );
00129     P( B, C, D, A,  2, 23, 0xC4AC5665 );
00130 
00131 #undef F
00132 
00133 #define F(x,y,z) (y ^ (x | ~z))
00134 
00135     P( A, B, C, D,  0,  6, 0xF4292244 );
00136     P( D, A, B, C,  7, 10, 0x432AFF97 );
00137     P( C, D, A, B, 14, 15, 0xAB9423A7 );
00138     P( B, C, D, A,  5, 21, 0xFC93A039 );
00139     P( A, B, C, D, 12,  6, 0x655B59C3 );
00140     P( D, A, B, C,  3, 10, 0x8F0CCC92 );
00141     P( C, D, A, B, 10, 15, 0xFFEFF47D );
00142     P( B, C, D, A,  1, 21, 0x85845DD1 );
00143     P( A, B, C, D,  8,  6, 0x6FA87E4F );
00144     P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
00145     P( C, D, A, B,  6, 15, 0xA3014314 );
00146     P( B, C, D, A, 13, 21, 0x4E0811A1 );
00147     P( A, B, C, D,  4,  6, 0xF7537E82 );
00148     P( D, A, B, C, 11, 10, 0xBD3AF235 );
00149     P( C, D, A, B,  2, 15, 0x2AD7D2BB );
00150     P( B, C, D, A,  9, 21, 0xEB86D391 );
00151 
00152 #undef F
00153 
00154     ctx->state[0] += A;
00155     ctx->state[1] += B;
00156     ctx->state[2] += C;
00157     ctx->state[3] += D;
00158 }

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void md5_starts ( struct md5_context *  ctx  ) 

Definition at line 28 of file md5.c.

References md5_context::state, and md5_context::total.

00029 {
00030     ctx->total = 0;
00031     ctx->state[0] = 0x67452301;
00032     ctx->state[1] = 0xEFCDAB89;
00033     ctx->state[2] = 0x98BADCFE;
00034     ctx->state[3] = 0x10325476;
00035 }

void md5_update ( struct md5_context *  ctx,
uint8 *  input,
uint32  length 
)

Definition at line 160 of file md5.c.

References md5_context::buffer, md5_process(), md5_context::total, and uint32.

Referenced by md5_finish().

00161 {
00162     uint32 left, fill;
00163 
00164     if( ! length ) return;
00165 
00166     left = (uint32) (ctx->total & 0x3F);
00167     fill = 64 - left;
00168 
00169     ctx->total += length;
00170 
00171     if( left && length >= fill )
00172     {
00173         memcpy( (void *) (ctx->buffer + left), (void *) input, fill );
00174         md5_process( ctx, ctx->buffer );
00175         length -= fill;
00176         input  += fill;
00177         left = 0;
00178     }
00179 
00180     while( length >= 64 )
00181     {
00182         md5_process( ctx, input );
00183         length -= 64;
00184         input  += 64;
00185     }
00186 
00187     if( length )
00188     {
00189         memcpy( (void *) (ctx->buffer + left), (void *) input, length );
00190     }
00191 }

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Variable Documentation

uint8 md5_padding[64] [static]

Initial value:

{
 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
}

Definition at line 193 of file md5.c.

Referenced by md5_finish().

char const rcsid[] = "$Id: md5.c,v 1.4 2003/05/06 07:33:43 kate Exp $" [static]

Definition at line 10 of file md5.c.

Generated on Tue Dec 25 20:00:47 2007 for blat by  doxygen 1.5.2