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| /**
| \file
| SHA-1 in C
| By Steve Reid <sreid@sea-to-sky.net>
| 100% Public Domain
|
| -----------------
| Modified 7/98
| By James H. Brown <jbrown@burgoyne.com>
| Still 100% Public Domain
|
| Corrected a problem which generated improper hash values on 16 bit machines
| Routine mono_sha1_update changed from
| void mono_sha1_update(Il2CppSHA1Context* context, unsigned char* data, unsigned int
| len)
| to
| void mono_sha1_update(Il2CppSHA1Context* context, unsigned char* data, unsigned
| long len)
|
| The 'len' parameter was declared an int which works fine on 32 bit machines.
| However, on 16 bit machines an int is too small for the shifts being done
| against
| it. This caused the hash function to generate incorrect values if len was
| greater than 8191 (8K - 1) due to the 'len << 3' on line 3 of mono_sha1_update().
|
| Since the file IO in main() reads 16K at a time, any file 8K or larger would
| be guaranteed to generate the wrong hash (e.g. Test Vector #3, a million
| "a"s).
|
| I also changed the declaration of variables i & j in mono_sha1_update to
| unsigned long from unsigned int for the same reason.
|
| These changes should make no difference to any 32 bit implementations since
| an
| int and a long are the same size in those environments.
|
| --
| I also corrected a few compiler warnings generated by Borland C.
| 1. Added #include <process.h> for exit() prototype
| 2. Removed unused variable 'j' in mono_sha1_final
| 3. Changed exit(0) to return(0) at end of main.
|
| ALL changes I made can be located by searching for comments containing 'JHB'
| -----------------
| Modified 8/98
| By Steve Reid <sreid@sea-to-sky.net>
| Still 100% public domain
|
| 1- Removed #include <process.h> and used return() instead of exit()
| 2- Fixed overwriting of finalcount in mono_sha1_final() (discovered by Chris Hall)
| 3- Changed email address from steve@edmweb.com to sreid@sea-to-sky.net
|
| -----------------
| Modified 4/01
| By Saul Kravitz <Saul.Kravitz@celera.com>
| Still 100% PD
| Modified to run on Compaq Alpha hardware.
|
|
| */
|
| /*
| Test Vectors (from FIPS PUB 180-1)
| "abc"
| A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
| "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
| 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
| A million repetitions of "a"
| 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
| */
|
| #include <stdio.h>
| #include <string.h>
| #include <stdint.h>
|
| typedef struct
| {
| uint32_t state[5];
| uint32_t count[2];
| unsigned char buffer[64];
| } Il2CppSHA1Context;
|
| /* #include <process.h> */ /* prototype for exit() - JHB */
| /* Using return() instead of exit() - SWR */
|
| static void SHA1Transform(uint32_t state[5], const uint8_t buffer[64]);
|
| #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
|
| /* blk0() and blk() perform the initial expand. */
| /* I got the idea of expanding during the round function from SSLeay */
| #if G_BYTE_ORDER == G_LITTLE_ENDIAN
| #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
| |(rol(block->l[i],8)&0x00FF00FF))
| #else
| #define blk0(i) block->l[i]
| #endif
| #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
| ^block->l[(i+2)&15]^block->l[i&15],1))
|
| /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
| #define R0(v, w, x, y, z, i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
| #define R1(v, w, x, y, z, i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
| #define R2(v, w, x, y, z, i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
| #define R3(v, w, x, y, z, i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
| #define R4(v, w, x, y, z, i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
|
| /* Hash a single 512-bit block. This is the core of the algorithm. */
|
| static void SHA1Transform(uint32_t state[5], const uint8_t buffer[64])
| {
| uint32_t a, b, c, d, e;
| typedef union
| {
| unsigned char c[64];
| uint32_t l[16];
| } CHAR64LONG16;
| CHAR64LONG16* block;
|
| unsigned char workspace[64];
| block = (CHAR64LONG16*)workspace;
| memcpy(block, buffer, 64);
|
| /* Copy context->state[] to working vars */
| a = state[0];
| b = state[1];
| c = state[2];
| d = state[3];
| e = state[4];
| /* 4 rounds of 20 operations each. Loop unrolled. */
| R0(a, b, c, d, e, 0); R0(e, a, b, c, d, 1); R0(d, e, a, b, c, 2); R0(c, d, e, a, b, 3);
| R0(b, c, d, e, a, 4); R0(a, b, c, d, e, 5); R0(e, a, b, c, d, 6); R0(d, e, a, b, c, 7);
| R0(c, d, e, a, b, 8); R0(b, c, d, e, a, 9); R0(a, b, c, d, e, 10); R0(e, a, b, c, d, 11);
| R0(d, e, a, b, c, 12); R0(c, d, e, a, b, 13); R0(b, c, d, e, a, 14); R0(a, b, c, d, e, 15);
| R1(e, a, b, c, d, 16); R1(d, e, a, b, c, 17); R1(c, d, e, a, b, 18); R1(b, c, d, e, a, 19);
| R2(a, b, c, d, e, 20); R2(e, a, b, c, d, 21); R2(d, e, a, b, c, 22); R2(c, d, e, a, b, 23);
| R2(b, c, d, e, a, 24); R2(a, b, c, d, e, 25); R2(e, a, b, c, d, 26); R2(d, e, a, b, c, 27);
| R2(c, d, e, a, b, 28); R2(b, c, d, e, a, 29); R2(a, b, c, d, e, 30); R2(e, a, b, c, d, 31);
| R2(d, e, a, b, c, 32); R2(c, d, e, a, b, 33); R2(b, c, d, e, a, 34); R2(a, b, c, d, e, 35);
| R2(e, a, b, c, d, 36); R2(d, e, a, b, c, 37); R2(c, d, e, a, b, 38); R2(b, c, d, e, a, 39);
| R3(a, b, c, d, e, 40); R3(e, a, b, c, d, 41); R3(d, e, a, b, c, 42); R3(c, d, e, a, b, 43);
| R3(b, c, d, e, a, 44); R3(a, b, c, d, e, 45); R3(e, a, b, c, d, 46); R3(d, e, a, b, c, 47);
| R3(c, d, e, a, b, 48); R3(b, c, d, e, a, 49); R3(a, b, c, d, e, 50); R3(e, a, b, c, d, 51);
| R3(d, e, a, b, c, 52); R3(c, d, e, a, b, 53); R3(b, c, d, e, a, 54); R3(a, b, c, d, e, 55);
| R3(e, a, b, c, d, 56); R3(d, e, a, b, c, 57); R3(c, d, e, a, b, 58); R3(b, c, d, e, a, 59);
| R4(a, b, c, d, e, 60); R4(e, a, b, c, d, 61); R4(d, e, a, b, c, 62); R4(c, d, e, a, b, 63);
| R4(b, c, d, e, a, 64); R4(a, b, c, d, e, 65); R4(e, a, b, c, d, 66); R4(d, e, a, b, c, 67);
| R4(c, d, e, a, b, 68); R4(b, c, d, e, a, 69); R4(a, b, c, d, e, 70); R4(e, a, b, c, d, 71);
| R4(d, e, a, b, c, 72); R4(c, d, e, a, b, 73); R4(b, c, d, e, a, 74); R4(a, b, c, d, e, 75);
| R4(e, a, b, c, d, 76); R4(d, e, a, b, c, 77); R4(c, d, e, a, b, 78); R4(b, c, d, e, a, 79);
| /* Add the working vars back into context.state[] */
| state[0] += a;
| state[1] += b;
| state[2] += c;
| state[3] += d;
| state[4] += e;
| /* Wipe variables */
| a = b = c = d = e = 0;
| }
|
| /* sha1_init - Initialize new context */
|
| static void sha1_init(Il2CppSHA1Context* context)
| {
| /* SHA1 initialization constants */
| context->state[0] = 0x67452301;
| context->state[1] = 0xEFCDAB89;
| context->state[2] = 0x98BADCFE;
| context->state[3] = 0x10325476;
| context->state[4] = 0xC3D2E1F0;
| context->count[0] = context->count[1] = 0;
| }
|
| /* Run your data through this. */
|
| static void sha1_update(Il2CppSHA1Context* context, const uint8_t* data, uint32_t len) /*
| JHB */
| {
| uint32_t i, j; /* JHB */
|
| #ifdef VERBOSE
| SHAPrintContext(context, "before");
| #endif
| j = (context->count[0] >> 3) & 63;
| if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
| context->count[1] += (len >> 29);
| if ((j + len) > 63)
| {
| memcpy(&context->buffer[j], data, (i = 64 - j));
| SHA1Transform(context->state, context->buffer);
| for (; i + 63 < len; i += 64)
| {
| SHA1Transform(context->state, &data[i]);
| }
| j = 0;
| }
| else i = 0;
| memcpy(&context->buffer[j], &data[i], len - i);
| #ifdef VERBOSE
| SHAPrintContext(context, "after ");
| #endif
| }
|
| /* Add padding and return the message digest. */
|
| static void sha1_final(Il2CppSHA1Context* context, unsigned char digest[20])
| {
| uint32_t i; /* JHB */
| unsigned char finalcount[8];
|
| for (i = 0; i < 8; i++)
| {
| finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
| >> ((3 - (i & 3)) * 8)) & 255); /* Endian independent */
| }
| sha1_update(context, (unsigned char *)"\200", 1);
| while ((context->count[0] & 504) != 448)
| {
| sha1_update(context, (unsigned char *)"\0", 1);
| }
| sha1_update(context, finalcount, 8); /* Should cause a SHA1Transform()
| */
| for (i = 0; i < 20; i++)
| {
| digest[i] = (unsigned char)
| ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
| }
| /* Wipe variables */
| i = 0; /* JHB */
| memset(context->buffer, 0, 64);
| memset(context->state, 0, 20);
| memset(context->count, 0, 8);
| memset(finalcount, 0, 8); /* SWR */
| SHA1Transform(context->state, context->buffer);
| }
|
| /**
| * sha1_get_digest:
| */
| void sha1_get_digest(const uint8_t *buffer, int buffer_size, uint8_t digest[20])
| {
| Il2CppSHA1Context ctx;
|
| sha1_init(&ctx);
| sha1_update(&ctx, buffer, buffer_size);
| sha1_final(&ctx, digest);
| }
|
|