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md5.h File Reference

#include <inttypes.h>

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Data Structures

struct  MD5Context

Functions

void MD5Init (struct MD5Context *context)
void MD5Update (struct MD5Context *context, unsigned char const *buf, unsigned len)
void MD5Final (unsigned char digest[16], struct MD5Context *context)
void MD5Transform (uint32_t buf[4], uint32_t const in[16])

Function Documentation

void MD5Final (  unsigned char  digest[16],
struct MD5Context *  context
) 
 

Definition at line 126 of file md5.c.

References MD5Context::bits, MD5Context::buf, byteReverse(), MD5Context::in, and MD5Transform(). 

00127 {
00128     unsigned count;
00129     unsigned char *p;
00130 
00131     /* Compute number of bytes mod 64 */
00132     count = (ctx->bits[0] >> 3) & 0x3F;
00133 
00134     /* Set the first char of padding to 0x80.  This is safe since there is
00135        always at least one byte free */
00136     p = ctx->in + count;
00137     *p++ = 0x80;
00138 
00139     /* Bytes of padding needed to make 64 bytes */
00140     count = 64 - 1 - count;
00141 
00142     /* Pad out to 56 mod 64 */
00143     if (count < 8) {
00144    /* Two lots of padding:  Pad the first block to 64 bytes */
00145    memset(p, 0, count);
00146    byteReverse(ctx->in, 16);
00147    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00148 
00149    /* Now fill the next block with 56 bytes */
00150    memset(ctx->in, 0, 56);
00151     } else {
00152    /* Pad block to 56 bytes */
00153    memset(p, 0, count - 8);
00154     }
00155     byteReverse(ctx->in, 14);
00156 
00157     /* Append length in bits and transform */
00158     ((uint32_t *) ctx->in)[14] = ctx->bits[0];
00159     ((uint32_t *) ctx->in)[15] = ctx->bits[1];
00160 
00161     MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00162     byteReverse((unsigned char *) ctx->buf, 4);
00163     memcpy(digest, ctx->buf, 16);
00164     memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
00165 }

void MD5Init (  struct MD5Context *  context  ) 
 

Definition at line 63 of file md5.c.

References MD5Context::bits, and MD5Context::buf. 

00064 {
00065     ctx->buf[0] = 0x67452301;
00066     ctx->buf[1] = 0xefcdab89;
00067     ctx->buf[2] = 0x98badcfe;
00068     ctx->buf[3] = 0x10325476;
00069 
00070     ctx->bits[0] = 0;
00071     ctx->bits[1] = 0;
00072 }

void MD5Transform (  uint32_t  buf[4],
uint32_t const  in[16]
) 
 

Definition at line 186 of file md5.c.

References F1, F2, F3, F4, and MD5STEP.

Referenced by MD5Final(), and MD5Update(). 

00187 {
00188     register uint32_t a, b, c, d;
00189 
00190     a = buf[0];
00191     b = buf[1];
00192     c = buf[2];
00193     d = buf[3];
00194 
00195     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
00196     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
00197     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
00198     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
00199     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
00200     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
00201     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
00202     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
00203     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
00204     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
00205     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
00206     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
00207     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
00208     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
00209     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
00210     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
00211 
00212     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
00213     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
00214     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
00215     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
00216     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
00217     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
00218     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
00219     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
00220     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
00221     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
00222     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
00223     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
00224     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
00225     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
00226     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
00227     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
00228 
00229     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
00230     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
00231     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
00232     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
00233     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
00234     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
00235     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
00236     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
00237     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
00238     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
00239     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
00240     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
00241     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
00242     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
00243     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
00244     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
00245 
00246     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
00247     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
00248     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
00249     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
00250     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
00251     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
00252     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
00253     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
00254     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
00255     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
00256     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
00257     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
00258     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
00259     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
00260     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
00261     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
00262 
00263     buf[0] += a;
00264     buf[1] += b;
00265     buf[2] += c;
00266     buf[3] += d;
00267 }

void MD5Update (  struct MD5Context *  context,
unsigned char const *  buf,
unsigned  len
) 
 

Definition at line 78 of file md5.c.

References MD5Context::bits, MD5Context::buf, byteReverse(), MD5Context::in, and MD5Transform(). 

00079 {
00080     uint32_t t;
00081 
00082     /* Update bitcount */
00083 
00084     t = ctx->bits[0];
00085     if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
00086    ctx->bits[1]++;      /* Carry from low to high */
00087     ctx->bits[1] += len >> 29;
00088 
00089     t = (t >> 3) & 0x3f;   /* Bytes already in shsInfo->data */
00090 
00091     /* Handle any leading odd-sized chunks */
00092 
00093     if (t) {
00094    unsigned char *p = (unsigned char *) ctx->in + t;
00095 
00096    t = 64 - t;
00097    if (len < t) {
00098        memcpy(p, buf, len);
00099        return;
00100    }
00101    memcpy(p, buf, t);
00102    byteReverse(ctx->in, 16);
00103    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00104    buf += t;
00105    len -= t;
00106     }
00107     /* Process data in 64-byte chunks */
00108 
00109     while (len >= 64) {
00110    memcpy(ctx->in, buf, 64);
00111    byteReverse(ctx->in, 16);
00112    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00113    buf += 64;
00114    len -= 64;
00115     }
00116 
00117     /* Handle any remaining bytes of data. */
00118 
00119     memcpy(ctx->in, buf, len);
00120 }

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