sha1.h File Reference

Go to the source code of this file.

Data Structures
struct	SHA1_CTX

Macros
#define	SHA1_BLOCK_LENGTH   64
#define	SHA1_DIGEST_LENGTH   20

Functions
void	SHA1Init (SHA1_CTX *context)
void	SHA1Transform (uint32_t state[5], const unsigned char buffer[64])
void	SHA1Update (SHA1_CTX *context, const void *data, unsigned int len)
void	SHA1Final (unsigned char digest[20], SHA1_CTX *context)

Macro Definition Documentation

SHA1_BLOCK_LENGTH

#define SHA1_BLOCK_LENGTH   64

Definition at line 16 of file sha1.h.

Referenced by SHA1Transform().

SHA1_DIGEST_LENGTH

#define SHA1_DIGEST_LENGTH   20

Definition at line 17 of file sha1.h.

Referenced by SHA1Final(), and turn_generate_credentials().

Function Documentation

SHA1Final()

void SHA1Final	(	unsigned char	digest[20],
		SHA1_CTX *	context )

Definition at line 221 of file sha1.c.

                                                                            {
  unsigned int i;
  unsigned char finalcount[8];
 
  for (i = 0; i < 8; i++) {
    finalcount[i] = (unsigned char)((context->count >> ((7 - (i & 7)) * 8)) & 255); /* Endian independent */
  }
  SHA1Update(context, "\200", 1);
  while ((context->count & 504) != 448) {
    SHA1Update(context, "\0", 1);
  }
  SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
 
  for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
    digest[i] = (unsigned char)((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
  }
  memset(&finalcount, 0, sizeof(finalcount));
  memset(context, 0, sizeof(*context));
}

References SHA1_CTX::count, SHA1_DIGEST_LENGTH, SHA1Update(), and SHA1_CTX::state.

SHA1Init()

void SHA1Init

(

SHA1_CTX *

context

)

Definition at line 188 of file sha1.c.

                                 {
  /* SHA1 initialization constants */
  context->count = 0;
  context->state[0] = 0x67452301;
  context->state[1] = 0xEFCDAB89;
  context->state[2] = 0x98BADCFE;
  context->state[3] = 0x10325476;
  context->state[4] = 0xC3D2E1F0;
}

References SHA1_CTX::count, and SHA1_CTX::state.

SHA1Transform()

void SHA1Transform	(	uint32_t	state[5],
		const unsigned char	buffer[64] )

Definition at line 72 of file sha1.c.

                                                                                     {
  uint32_t a, b, c, d, e;
  typedef union {
    unsigned char c[SHA1_BLOCK_LENGTH];
    uint32_t l[16];
  } CHAR64LONG16;
  CHAR64LONG16 *block;
#ifdef SHA1HANDSOFF
  unsigned char workspace[SHA1_BLOCK_LENGTH];
 
  block = (CHAR64LONG16 *)workspace;
  memcpy(block, buffer, SHA1_BLOCK_LENGTH);
#else
  block = (CHAR64LONG16 *)buffer;
#endif
  /* 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] = (uint32_t)((uint64_t)state[0] + a);
  state[1] = (uint32_t)((uint64_t)state[1] + b);
  state[2] = (uint32_t)((uint64_t)state[2] + c);
  state[3] = (uint32_t)((uint64_t)state[3] + d);
  state[4] = (uint32_t)((uint64_t)state[4] + e);
  /* Wipe variables */
  a = b = c = d = e = 0;
}

References R0, R1, R2, R3, R4, and SHA1_BLOCK_LENGTH.

Referenced by SHA1Update().

SHA1Update()

void SHA1Update	(	SHA1_CTX *	context,
		const void *	data,
		unsigned int	len )

Definition at line 200 of file sha1.c.

                                                                          {
  const uint8_t *data = dataptr;
  unsigned int i;
  unsigned int j;
 
  j = (uint32_t)((context->count >> 3) & 63);
  context->count += (uint64_t)len << 3;
  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);
}

References SHA1_CTX::buffer, SHA1_CTX::count, SHA1Transform(), and SHA1_CTX::state.

Referenced by SHA1Final().