sha1.c
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上传日期:2022-05-23
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- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: sha1.c,v 1.13 2002/04/09 13:40:36 sue Exp $";
- #endif /* not lint */
- /*
- 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 SHA1Update changed from
- void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int
- len)
- to
- void SHA1Update(SHA1_CTX* 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 SHA1Update().
- 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 SHA1Update 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 SHA1Final
- 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 SHA1Final() (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
- */
- #define SHA1HANDSOFF
- #ifndef NO_SYSTEM_INCLUDES
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "dbinc/hmac.h"
- /* #include <process.h> */ /* prototype for exit() - JHB */
- /* Using return() instead of exit() - SWR */
- #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 */
- #define blk0(i) is_bigendian ? block->l[i] :
- (block->l[i] = (rol(block->l[i],24)&0xFF00FF00)
- |(rol(block->l[i],8)&0x00FF00FF))
- #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);
- #ifdef VERBOSE /* SAK */
- static void __db_SHAPrintContext __P((SHA1_CTX *, char *));
- static void
- __db_SHAPrintContext(context, msg)
- SHA1_CTX *context;
- char *msg;
- {
- printf("%s (%d,%d) %x %x %x %x %xn",
- msg,
- context->count[0], context->count[1],
- context->state[0],
- context->state[1],
- context->state[2],
- context->state[3],
- context->state[4]);
- }
- #endif
- /* Hash a single 512-bit block. This is the core of the algorithm. */
- /*
- * __db_SHA1Transform --
- *
- * PUBLIC: void __db_SHA1Transform __P((u_int32_t *, unsigned char *));
- */
- void
- __db_SHA1Transform(state, buffer)
- u_int32_t *state;
- unsigned char *buffer;
- {
- u_int32_t a, b, c, d, e;
- typedef union {
- unsigned char c[64];
- u_int32_t l[16];
- } CHAR64LONG16;
- CHAR64LONG16* block;
- static int is_bigendian = -1;
- #ifdef SHA1HANDSOFF
- unsigned char workspace[64];
- block = (CHAR64LONG16*)workspace;
- memcpy(block, buffer, 64);
- #else
- block = (CHAR64LONG16*)buffer;
- #endif
- if (is_bigendian == -1)
- is_bigendian = __db_isbigendian();
- /* 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;
- }
- /* SHA1Init - Initialize new context */
- /*
- * __db_SHA1Init --
- * Initialize new context
- *
- * PUBLIC: void __db_SHA1Init __P((SHA1_CTX *));
- */
- void
- __db_SHA1Init(context)
- SHA1_CTX *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. */
- /*
- * __db_SHA1Update --
- * Run your data through this.
- *
- * PUBLIC: void __db_SHA1Update __P((SHA1_CTX *, unsigned char *,
- * PUBLIC: size_t));
- */
- void
- __db_SHA1Update(context, data, len)
- SHA1_CTX *context;
- unsigned char *data;
- size_t len;
- {
- u_int32_t i, j; /* JHB */
- #ifdef VERBOSE
- __db_SHAPrintContext(context, "before");
- #endif
- j = (context->count[0] >> 3) & 63;
- if ((context->count[0] += (u_int32_t)len << 3) < (len << 3)) context->count[1]++;
- context->count[1] += (u_int32_t)(len >> 29);
- if ((j + len) > 63) {
- memcpy(&context->buffer[j], data, (i = 64-j));
- __db_SHA1Transform(context->state, context->buffer);
- for ( ; i + 63 < len; i += 64) {
- __db_SHA1Transform(context->state, &data[i]);
- }
- j = 0;
- }
- else i = 0;
- memcpy(&context->buffer[j], &data[i], len - i);
- #ifdef VERBOSE
- __db_SHAPrintContext(context, "after ");
- #endif
- }
- /* Add padding and return the message digest. */
- /*
- * __db_SHA1Final --
- * Add padding and return the message digest.
- *
- * PUBLIC: void __db_SHA1Final __P((unsigned char *, SHA1_CTX *));
- */
- void
- __db_SHA1Final(digest, context)
- unsigned char *digest;
- SHA1_CTX *context;
- {
- u_int32_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 */
- }
- __db_SHA1Update(context, (unsigned char *)"200", 1);
- while ((context->count[0] & 504) != 448) {
- __db_SHA1Update(context, (unsigned char *)"