Thu Oct 11 06:49:20 2012

Asterisk developer's documentation


md5.h File Reference

MD5 digest functions. More...

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Data Structures

struct  MD5Context

Functions

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


Detailed Description

MD5 digest functions.

Definition in file md5.h.


Function Documentation

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

Definition at line 122 of file md5.c.

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

Referenced by ast_md5_hash(), authenticate(), authenticate_verify(), decrypt_frame(), festival_exec(), iax2_key_rotate(), prov_ver_calc(), register_verify(), try_firmware(), try_load_key(), and verify_key().

00123 {
00124    unsigned count;
00125    unsigned char *p;
00126 
00127    /* Compute number of bytes mod 64 */
00128    count = (ctx->bits[0] >> 3) & 0x3F;
00129 
00130    /* Set the first char of padding to 0x80.  This is safe since there is
00131       always at least one byte free */
00132    p = ctx->in + count;
00133    *p++ = 0x80;
00134 
00135    /* Bytes of padding needed to make 64 bytes */
00136    count = 64 - 1 - count;
00137 
00138    /* Pad out to 56 mod 64 */
00139    if (count < 8) {
00140       /* Two lots of padding:  Pad the first block to 64 bytes */
00141       memset(p, 0, count);
00142       byteReverse(ctx->in, 16);
00143       MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00144 
00145       /* Now fill the next block with 56 bytes */
00146       memset(ctx->in, 0, 56);
00147    } else {
00148       /* Pad block to 56 bytes */
00149       memset(p, 0, count - 8);
00150    }
00151    byteReverse(ctx->in, 14);
00152 
00153    /* Append length in bits and transform */
00154    ((uint32_t *) ctx->in)[14] = ctx->bits[0];
00155    ((uint32_t *) ctx->in)[15] = ctx->bits[1];
00156 
00157    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00158    byteReverse((unsigned char *) ctx->buf, 4);
00159    memcpy(digest, ctx->buf, 16);
00160    memset(ctx, 0, sizeof(ctx));  /* In case it's sensitive */
00161 }

void MD5Init ( struct MD5Context context  ) 

Definition at line 59 of file md5.c.

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

Referenced by ast_md5_hash(), authenticate(), authenticate_verify(), decrypt_frame(), festival_exec(), iax2_key_rotate(), prov_ver_calc(), register_verify(), try_firmware(), try_load_key(), and verify_key().

00060 {
00061    ctx->buf[0] = 0x67452301;
00062    ctx->buf[1] = 0xefcdab89;
00063    ctx->buf[2] = 0x98badcfe;
00064    ctx->buf[3] = 0x10325476;
00065 
00066    ctx->bits[0] = 0;
00067    ctx->bits[1] = 0;
00068 }

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

Definition at line 182 of file md5.c.

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

Referenced by MD5Final(), and MD5Update().

00183 {
00184    register uint32_t a, b, c, d;
00185 
00186    a = buf[0];
00187    b = buf[1];
00188    c = buf[2];
00189    d = buf[3];
00190 
00191    MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
00192    MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
00193    MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
00194    MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
00195    MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
00196    MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
00197    MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
00198    MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
00199    MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
00200    MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
00201    MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
00202    MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
00203    MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
00204    MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
00205    MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
00206    MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
00207 
00208    MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
00209    MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
00210    MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
00211    MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
00212    MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
00213    MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
00214    MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
00215    MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
00216    MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
00217    MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
00218    MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
00219    MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
00220    MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
00221    MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
00222    MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
00223    MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
00224 
00225    MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
00226    MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
00227    MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
00228    MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
00229    MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
00230    MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
00231    MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
00232    MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
00233    MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
00234    MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
00235    MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
00236    MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
00237    MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
00238    MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
00239    MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
00240    MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
00241 
00242    MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
00243    MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
00244    MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
00245    MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
00246    MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
00247    MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
00248    MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
00249    MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
00250    MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
00251    MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
00252    MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
00253    MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
00254    MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
00255    MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
00256    MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
00257    MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
00258 
00259    buf[0] += a;
00260    buf[1] += b;
00261    buf[2] += c;
00262    buf[3] += d;
00263 }

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

Definition at line 74 of file md5.c.

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

Referenced by ast_md5_hash(), authenticate(), authenticate_verify(), decrypt_frame(), festival_exec(), iax2_key_rotate(), prov_ver_calc(), register_verify(), try_firmware(), try_load_key(), and verify_key().

00075 {
00076    uint32_t t;
00077 
00078    /* Update bitcount */
00079 
00080    t = ctx->bits[0];
00081    if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
00082       ctx->bits[1]++;      /* Carry from low to high */
00083    ctx->bits[1] += len >> 29;
00084 
00085    t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
00086 
00087    /* Handle any leading odd-sized chunks */
00088 
00089    if (t) {
00090       unsigned char *p = (unsigned char *) ctx->in + t;
00091 
00092       t = 64 - t;
00093       if (len < t) {
00094          memcpy(p, buf, len);
00095          return;
00096       }
00097       memcpy(p, buf, t);
00098       byteReverse(ctx->in, 16);
00099       MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00100       buf += t;
00101       len -= t;
00102    }
00103    /* Process data in 64-byte chunks */
00104 
00105    while (len >= 64) {
00106       memcpy(ctx->in, buf, 64);
00107       byteReverse(ctx->in, 16);
00108       MD5Transform(ctx->buf, (uint32_t *) ctx->in);
00109       buf += 64;
00110       len -= 64;
00111    }
00112 
00113    /* Handle any remaining bytes of data. */
00114 
00115    memcpy(ctx->in, buf, len);
00116 }


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