Changeset 34afea7 for lib/sha1.c


Ignore:
Timestamp:
2015-01-31T23:58:57Z (10 years ago)
Author:
dequis <dx@…>
Branches:
master
Children:
0ca1d79
Parents:
e41cc40
git-author:
dequis <dx@…> (18-01-15 06:39:20)
git-committer:
dequis <dx@…> (31-01-15 23:58:57)
Message:

Use glib's GChecksum for md5/sha1

This changes behavior slightly:

  • md5_init()/sha1_init() allocate a GChecksum
  • md5_finish()/sha1_finish() close and free() it
  • md5_digest_keep() was added (no sha1 equivalent needed)

And yes, glib has this concept of "closing" the GChecksum, which means
it can't be used anymore after g_checksum_get_digest().

jabber_cache_add() actually seems to need to do that to generate some
random-ish values, so i kept that working by adding a md5_digest_keep()
function that copies the GChecksum before it gets closed

GChecksum was introduced in glib 2.16, so the configure script version
was bumped. We were already depending on glib 2.16 accidentally
(some post-3.2.2 code uses GHashTableIter)

File:
1 edited

Legend:

Unmodified
Added
Removed

  • lib/sha1.c

    re41cc40 r34afea7  
    1 /*
    2  * SHA1 hashing code copied from Lepton's crack <http://usuarios.lycos.es/reinob/>
    3  *
    4  * Adapted to be API-compatible with the previous (GPL-incompatible) code.
    5  */
    6 
    7 /*
    8  *  sha1.c
    9  *
    10  *  Description:
    11  *      This file implements the Secure Hashing Algorithm 1 as
    12  *      defined in FIPS PUB 180-1 published April 17, 1995.
    13  *
    14  *      The SHA-1, produces a 160-bit message digest for a given
    15  *      data stream.  It should take about 2**n steps to find a
    16  *      message with the same digest as a given message and
    17  *      2**(n/2) to find any two messages with the same digest,
    18  *      when n is the digest size in bits.  Therefore, this
    19  *      algorithm can serve as a means of providing a
    20  *      "fingerprint" for a message.
    21  *
    22  *  Portability Issues:
    23  *      SHA-1 is defined in terms of 32-bit "words".  This code
    24  *      uses <stdint.h> (included via "sha1.h" to define 32 and 8
    25  *      bit unsigned integer types.  If your C compiler does not
    26  *      support 32 bit unsigned integers, this code is not
    27  *      appropriate.
    28  *
    29  *  Caveats:
    30  *      SHA-1 is designed to work with messages less than 2^64 bits
    31  *      long.  Although SHA-1 allows a message digest to be generated
    32  *      for messages of any number of bits less than 2^64, this
    33  *      implementation only works with messages with a length that is
    34  *      a multiple of the size of an 8-bit character.
    35  *
    36  */
    37 
     1#include "sha1.h"
    382#include <string.h>
    393#include <stdio.h>
    40 #include "sha1.h"
    414
    42 /*
    43  *  Define the SHA1 circular left shift macro
    44  */
    45 #define SHA1CircularShift(bits,word) \
    46        (((word) << (bits)) | ((word) >> (32-(bits))))
    475
    48 /* Local Function Prototyptes */
    49 static void sha1_pad(sha1_state_t *);
    50 static void sha1_process_block(sha1_state_t *);
    51 
    52 /*
    53  *  sha1_init
    54  *
    55  *  Description:
    56  *      This function will initialize the sha1_state_t in preparation
    57  *      for computing a new SHA1 message digest.
    58  *
    59  *  Parameters:
    60  *      context: [in/out]
    61  *          The context to reset.
    62  *
    63  *  Returns:
    64  *      sha Error Code.
    65  *
    66  */
    67 int sha1_init(sha1_state_t * context)
     6void sha1_init(sha1_state_t *ctx)
    687{
    69         context->Length_Low = 0;
    70         context->Length_High = 0;
    71         context->Message_Block_Index = 0;
    72 
    73         context->Intermediate_Hash[0] = 0x67452301;
    74         context->Intermediate_Hash[1] = 0xEFCDAB89;
    75         context->Intermediate_Hash[2] = 0x98BADCFE;
    76         context->Intermediate_Hash[3] = 0x10325476;
    77         context->Intermediate_Hash[4] = 0xC3D2E1F0;
    78 
    79         context->Computed = 0;
    80         context->Corrupted = 0;
    81        
    82         return shaSuccess;
     8        *ctx = g_checksum_new(G_CHECKSUM_SHA1);
    839}
    8410
    85 /*
    86  *  sha1_finish
    87  *
    88  *  Description:
    89  *      This function will return the 160-bit message digest into the
    90  *      Message_Digest array  provided by the caller.
    91  *      NOTE: The first octet of hash is stored in the 0th element,
    92  *            the last octet of hash in the 19th element.
    93  *
    94  *  Parameters:
    95  *      context: [in/out]
    96  *          The context to use to calculate the SHA-1 hash.
    97  *      Message_Digest: [out]
    98  *          Where the digest is returned.
    99  *
    100  *  Returns:
    101  *      sha Error Code.
    102  *
    103  */
    104 int sha1_finish(sha1_state_t * context, uint8_t Message_Digest[sha1_hash_size])
     11void sha1_append(sha1_state_t *ctx, const guint8 * message_array, guint len)
    10512{
    106         int i;
    107 
    108         if (!context || !Message_Digest) {
    109                 return shaNull;
    110         }
    111 
    112         if (context->Corrupted) {
    113                 return context->Corrupted;
    114         }
    115 
    116         if (!context->Computed) {
    117                 sha1_pad(context);
    118                 for (i = 0; i < 64; ++i) {
    119                         /* message may be sensitive, clear it out */
    120                         context->Message_Block[i] = 0;
    121                 }
    122                 context->Length_Low = 0;        /* and clear length */
    123                 context->Length_High = 0;
    124                 context->Computed = 1;
    125 
    126         }
    127 
    128         for (i = 0; i < sha1_hash_size; ++i) {
    129                 Message_Digest[i] = context->Intermediate_Hash[i >> 2]
    130                     >> 8 * (3 - (i & 0x03));
    131         }
    132 
    133         return shaSuccess;
     13        g_checksum_update(*ctx, message_array, len);
    13414}
    13515
    136 /*
    137  *  sha1_append
    138  *
    139  *  Description:
    140  *      This function accepts an array of octets as the next portion
    141  *      of the message.
    142  *
    143  *  Parameters:
    144  *      context: [in/out]
    145  *          The SHA context to update
    146  *      message_array: [in]
    147  *          An array of characters representing the next portion of
    148  *          the message.
    149  *      length: [in]
    150  *          The length of the message in message_array
    151  *
    152  *  Returns:
    153  *      sha Error Code.
    154  *
    155  */
    156 int
    157 sha1_append(sha1_state_t * context,
    158           const uint8_t * message_array, unsigned length)
     16void sha1_finish(sha1_state_t *ctx, guint8 digest[SHA1_HASH_SIZE])
    15917{
    160         if (!length) {
    161                 return shaSuccess;
    162         }
    163 
    164         if (!context || !message_array) {
    165                 return shaNull;
    166         }
    167 
    168         if (context->Computed) {
    169                 context->Corrupted = shaStateError;
    170 
    171                 return shaStateError;
    172         }
    173 
    174         if (context->Corrupted) {
    175                 return context->Corrupted;
    176         }
    177         while (length-- && !context->Corrupted) {
    178                 context->Message_Block[context->Message_Block_Index++] =
    179                     (*message_array & 0xFF);
    180 
    181                 context->Length_Low += 8;
    182                 if (context->Length_Low == 0) {
    183                         context->Length_High++;
    184                         if (context->Length_High == 0) {
    185                                 /* Message is too long */
    186                                 context->Corrupted = 1;
    187                         }
    188                 }
    189 
    190                 if (context->Message_Block_Index == 64) {
    191                         sha1_process_block(context);
    192                 }
    193 
    194                 message_array++;
    195         }
    196 
    197         return shaSuccess;
    198 }
    199 
    200 /*
    201  *  sha1_process_block
    202  *
    203  *  Description:
    204  *      This function will process the next 512 bits of the message
    205  *      stored in the Message_Block array.
    206  *
    207  *  Parameters:
    208  *      None.
    209  *
    210  *  Returns:
    211  *      Nothing.
    212  *
    213  *  Comments:
    214  *      Many of the variable names in this code, especially the
    215  *      single character names, were used because those were the
    216  *      names used in the publication.
    217  *
    218  *
    219  */
    220 static void sha1_process_block(sha1_state_t * context)
    221 {
    222         const uint32_t K[] = {  /* Constants defined in SHA-1   */
    223                 0x5A827999,
    224                 0x6ED9EBA1,
    225                 0x8F1BBCDC,
    226                 0xCA62C1D6
    227         };
    228         int t;                  /* Loop counter                */
    229         uint32_t temp;          /* Temporary word value        */
    230         uint32_t W[80];         /* Word sequence               */
    231         uint32_t A, B, C, D, E; /* Word buffers                */
    232 
    233         /*
    234          *  Initialize the first 16 words in the array W
    235          */
    236         for (t = 0; t < 16; t++) {
    237                 W[t] = context->Message_Block[t * 4] << 24;
    238                 W[t] |= context->Message_Block[t * 4 + 1] << 16;
    239                 W[t] |= context->Message_Block[t * 4 + 2] << 8;
    240                 W[t] |= context->Message_Block[t * 4 + 3];
    241         }
    242 
    243         for (t = 16; t < 80; t++) {
    244                 W[t] =
    245                     SHA1CircularShift(1,
    246                                       W[t - 3] ^ W[t - 8] ^ W[t -
    247                                                               14] ^ W[t -
    248                                                                       16]);
    249         }
    250 
    251         A = context->Intermediate_Hash[0];
    252         B = context->Intermediate_Hash[1];
    253         C = context->Intermediate_Hash[2];
    254         D = context->Intermediate_Hash[3];
    255         E = context->Intermediate_Hash[4];
    256 
    257         for (t = 0; t < 20; t++) {
    258                 temp = SHA1CircularShift(5, A) +
    259                     ((B & C) | ((~B) & D)) + E + W[t] + K[0];
    260                 E = D;
    261                 D = C;
    262                 C = SHA1CircularShift(30, B);
    263 
    264                 B = A;
    265                 A = temp;
    266         }
    267 
    268         for (t = 20; t < 40; t++) {
    269                 temp =
    270                     SHA1CircularShift(5,
    271                                       A) + (B ^ C ^ D) + E + W[t] + K[1];
    272                 E = D;
    273                 D = C;
    274                 C = SHA1CircularShift(30, B);
    275                 B = A;
    276                 A = temp;
    277         }
    278 
    279         for (t = 40; t < 60; t++) {
    280                 temp = SHA1CircularShift(5, A) +
    281                     ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
    282                 E = D;
    283                 D = C;
    284                 C = SHA1CircularShift(30, B);
    285                 B = A;
    286                 A = temp;
    287         }
    288 
    289         for (t = 60; t < 80; t++) {
    290                 temp =
    291                     SHA1CircularShift(5,
    292                                       A) + (B ^ C ^ D) + E + W[t] + K[3];
    293                 E = D;
    294                 D = C;
    295                 C = SHA1CircularShift(30, B);
    296                 B = A;
    297                 A = temp;
    298         }
    299 
    300         context->Intermediate_Hash[0] += A;
    301         context->Intermediate_Hash[1] += B;
    302         context->Intermediate_Hash[2] += C;
    303         context->Intermediate_Hash[3] += D;
    304         context->Intermediate_Hash[4] += E;
    305 
    306         context->Message_Block_Index = 0;
    307 }
    308 
    309 /*
    310  *  sha1_pad
    311  *
    312  *  Description:
    313  *      According to the standard, the message must be padded to an even
    314  *      512 bits.  The first padding bit must be a '1'.  The last 64
    315  *      bits represent the length of the original message.  All bits in
    316  *      between should be 0.  This function will pad the message
    317  *      according to those rules by filling the Message_Block array
    318  *      accordingly.  It will also call the ProcessMessageBlock function
    319  *      provided appropriately.  When it returns, it can be assumed that
    320  *      the message digest has been computed.
    321  *
    322  *  Parameters:
    323  *      context: [in/out]
    324  *          The context to pad
    325  *      ProcessMessageBlock: [in]
    326  *          The appropriate SHA*ProcessMessageBlock function
    327  *  Returns:
    328  *      Nothing.
    329  *
    330  */
    331 
    332 static void sha1_pad(sha1_state_t * context)
    333 {
    334         /*
    335          *  Check to see if the current message block is too small to hold
    336          *  the initial padding bits and length.  If so, we will pad the
    337          *  block, process it, and then continue padding into a second
    338          *  block.
    339          */
    340         if (context->Message_Block_Index > 55) {
    341                 context->Message_Block[context->Message_Block_Index++] =
    342                     0x80;
    343                 while (context->Message_Block_Index < 64) {
    344                         context->Message_Block[context->
    345                                                Message_Block_Index++] = 0;
    346                 }
    347 
    348                 sha1_process_block(context);
    349 
    350                 while (context->Message_Block_Index < 56) {
    351                         context->Message_Block[context->
    352                                                Message_Block_Index++] = 0;
    353                 }
    354         } else {
    355                 context->Message_Block[context->Message_Block_Index++] =
    356                     0x80;
    357                 while (context->Message_Block_Index < 56) {
    358 
    359                         context->Message_Block[context->
    360                                                Message_Block_Index++] = 0;
    361                 }
    362         }
    363 
    364         /*
    365          *  Store the message length as the last 8 octets
    366          */
    367         context->Message_Block[56] = context->Length_High >> 24;
    368         context->Message_Block[57] = context->Length_High >> 16;
    369         context->Message_Block[58] = context->Length_High >> 8;
    370         context->Message_Block[59] = context->Length_High;
    371         context->Message_Block[60] = context->Length_Low >> 24;
    372         context->Message_Block[61] = context->Length_Low >> 16;
    373         context->Message_Block[62] = context->Length_Low >> 8;
    374         context->Message_Block[63] = context->Length_Low;
    375 
    376         sha1_process_block(context);
     18        gsize digest_len = SHA1_HASH_SIZE;
     19        g_checksum_get_digest(*ctx, digest, &digest_len);
     20        g_checksum_free(*ctx);
    37721}
    37822
    … …  
    38024
    38125/* BitlBee addition: */
    382 void sha1_hmac(const char *key_, size_t key_len, const char *payload, size_t payload_len, uint8_t Message_Digest[sha1_hash_size])
     26void sha1_hmac(const char *key_, size_t key_len, const char *payload, size_t payload_len, guint8 digest[SHA1_HASH_SIZE])
    38327{
    38428        sha1_state_t sha1;
    385         uint8_t hash[sha1_hash_size];
    386         uint8_t key[HMAC_BLOCK_SIZE+1];
     29        guint8 hash[SHA1_HASH_SIZE];
     30        guint8 key[HMAC_BLOCK_SIZE+1];
    38731        int i;
    38832       
    … …  
    39842        {
    39943                sha1_init( &sha1 );
    400                 sha1_append( &sha1, (uint8_t*) key_, key_len );
     44                sha1_append( &sha1, (guint8*) key_, key_len );
    40145                sha1_finish( &sha1, key );
    40246        }
    … …  
    41155                key[i] ^= 0x36;
    41256        sha1_append( &sha1, key, HMAC_BLOCK_SIZE );
    413         sha1_append( &sha1, (const uint8_t*) payload, payload_len );
     57        sha1_append( &sha1, (const guint8*) payload, payload_len );
    41458        sha1_finish( &sha1, hash );
    41559       
    … …  
    41963                key[i] ^= 0x36 ^ 0x5c;
    42064        sha1_append( &sha1, key, HMAC_BLOCK_SIZE );
    421         sha1_append( &sha1, hash, sha1_hash_size );
    422         sha1_finish( &sha1, Message_Digest );
     65        sha1_append( &sha1, hash, SHA1_HASH_SIZE );
     66        sha1_finish( &sha1, digest );
    42367}
    42468
    … …  
    43175char *sha1_random_uuid( sha1_state_t * context )
    43276{
    433         uint8_t dig[sha1_hash_size];
     77        guint8 dig[SHA1_HASH_SIZE];
    43478        char *ret = g_new0( char, 40 ); /* 36 chars + \0 */
    43579        int i, p;
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