skalibs

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sha256_transform.c (2074B)

      1 /* ISC license. */
      2 
      3 #include "sha256-internal.h"
      4 
      5 #define F1(x, y, z) ((x & y) | ((~x) & z))
      6 #define F2(x, y, z) ((x & y) | (x & z) | (y & z))
      7 
      8 #define ROTR(x,n) (((x)>>(n)) | ((x)<<(32-(n))))
      9 #define CAPITALSIGMA0(x) (ROTR(x,2)^ROTR(x,13)^ROTR(x,22))
     10 #define CAPITALSIGMA1(x) (ROTR(x,6)^ROTR(x,11)^ROTR(x,25))
     11 #define SMALLSIGMA0(x) (ROTR(x,7)^ROTR(x,18)^((x)>>3))
     12 #define SMALLSIGMA1(x) (ROTR(x,17)^ROTR(x,19)^((x)>>10))
     13 
     14 static uint32_t const sha256_constants[64] =
     15 {
     16   0x428a2f98U, 0x71374491U, 0xb5c0fbcfU, 0xe9b5dba5U,
     17   0x3956c25bU, 0x59f111f1U, 0x923f82a4U, 0xab1c5ed5U,
     18   0xd807aa98U, 0x12835b01U, 0x243185beU, 0x550c7dc3U,
     19   0x72be5d74U, 0x80deb1feU, 0x9bdc06a7U, 0xc19bf174U,
     20   0xe49b69c1U, 0xefbe4786U, 0x0fc19dc6U, 0x240ca1ccU,
     21   0x2de92c6fU, 0x4a7484aaU, 0x5cb0a9dcU, 0x76f988daU,
     22   0x983e5152U, 0xa831c66dU, 0xb00327c8U, 0xbf597fc7U,
     23   0xc6e00bf3U, 0xd5a79147U, 0x06ca6351U, 0x14292967U,
     24   0x27b70a85U, 0x2e1b2138U, 0x4d2c6dfcU, 0x53380d13U,
     25   0x650a7354U, 0x766a0abbU, 0x81c2c92eU, 0x92722c85U,
     26   0xa2bfe8a1U, 0xa81a664bU, 0xc24b8b70U, 0xc76c51a3U,
     27   0xd192e819U, 0xd6990624U, 0xf40e3585U, 0x106aa070U,
     28   0x19a4c116U, 0x1e376c08U, 0x2748774cU, 0x34b0bcb5U,
     29   0x391c0cb3U, 0x4ed8aa4aU, 0x5b9cca4fU, 0x682e6ff3U,
     30   0x748f82eeU, 0x78a5636fU, 0x84c87814U, 0x8cc70208U,
     31   0x90befffaU, 0xa4506cebU, 0xbef9a3f7U, 0xc67178f2U
     32 } ;
     33 
     34 void sha256_transform (uint32_t *buf, uint32_t const *in)
     35 {
     36   uint32_t w[64] ;
     37   unsigned int i = 0 ;
     38   uint32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3], e = buf[4], f = buf[5], g = buf[6], h = buf[7] ;
     39 
     40   for (; i < 16 ; i++) w[i] = in[i] ;
     41   for (; i < 64 ; i++)
     42     w[i] = SMALLSIGMA1(w[i-2]) + w[i-7] + SMALLSIGMA0(w[i-15]) + w[i-16] ;
     43   for (i = 0 ; i < 64 ; i++)
     44   {
     45     uint32_t temp1 = h + CAPITALSIGMA1(e) + F1(e, f, g) + sha256_constants[i] + w[i] ;
     46     uint32_t temp2 = CAPITALSIGMA0(a) + F2(a, b, c) ;
     47     h = g ; g = f ; f = e ; e = d + temp1 ;
     48     d = c ; c = b ; b = a ; a = temp1 + temp2 ;
     49   }
     50   buf[0] += a ; buf[1] += b ; buf[2] += c ; buf[3] += d ;
     51   buf[4] += e ; buf[5] += f ; buf[6] += g ; buf[7] += h ;
     52 }