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- /*
- * md2.c : MD2 hash algorithm.
- *
- * Part of the Python Cryptography Toolkit
- *
- * Originally written by: A.M. Kuchling
- *
- * ===================================================================
- * The contents of this file are dedicated to the public domain. To
- * the extent that dedication to the public domain is not available,
- * everyone is granted a worldwide, perpetual, royalty-free,
- * non-exclusive license to exercise all rights associated with the
- * contents of this file for any purpose whatsoever.
- * No rights are reserved.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- * ===================================================================
- *
- */
- #include "pycrypto_common.h"
- FAKE_INIT(MD2)
- typedef struct {
- uint8_t C[16], X[48];
- size_t count;
- uint8_t buf[16];
- } hash_state;
- EXPORT_SYM int md2_init(hash_state **md2State)
- {
- hash_state *hs;
-
- if (NULL == md2State) {
- return ERR_NULL;
- }
- *md2State = hs = (hash_state*) calloc(1, sizeof(hash_state));
- if (NULL == hs)
- return ERR_MEMORY;
-
- return 0;
- }
- EXPORT_SYM int md2_destroy(hash_state *hs)
- {
- free(hs);
- return 0;
- }
- static const uint8_t S[256] = {
- 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
- 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
- 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
- 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
- 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
- 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
- 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
- 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
- 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
- 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
- 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
- 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
- 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
- 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
- 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
- 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
- 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
- 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
- };
- EXPORT_SYM int md2_copy(const hash_state *src, hash_state *dst)
- {
- if (NULL == src || NULL == dst) {
- return ERR_NULL;
- }
- *dst = *src;
- return 0;
- }
- EXPORT_SYM int md2_update(hash_state *hs, const uint8_t *buf, size_t len)
- {
- uint32_t L;
- if (NULL == hs || NULL == buf)
- return ERR_NULL;
- while (len)
- {
- L=(16-hs->count) < len ? (16-hs->count) : len;
- memcpy(hs->buf+hs->count, buf, L);
- hs->count+=L;
- buf+=L;
- len-=L;
- if (hs->count==16)
- {
- uint8_t t;
- int i,j;
-
- hs->count=0;
- memcpy(hs->X+16, hs->buf, 16);
- t=hs->C[15];
- for(i=0; i<16; i++)
- {
- hs->X[32+i]=hs->X[16+i]^hs->X[i];
- t=hs->C[i]^=S[hs->buf[i]^t];
- }
-
- t=0;
- for(i=0; i<18; i++)
- {
- for(j=0; j<48; j++)
- t=hs->X[j]^=S[t];
- t=(t+i) & 0xFF;
- }
- }
- }
- return 0;
- }
- EXPORT_SYM int md2_digest(const hash_state *hs, uint8_t digest[16])
- {
- uint8_t padding[16];
- uint32_t padlen;
- hash_state temp;
- unsigned int i;
-
- if (NULL==hs || digest==NULL)
- return ERR_NULL;
-
- temp = *hs;
- padlen= 16-hs->count;
- for(i=0; i<padlen; i++) padding[i]=padlen;
- md2_update(&temp, padding, padlen);
- md2_update(&temp, temp.C, 16);
- memcpy(digest, temp.X, 16);
- return 0;
- }
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