60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
#include <curve.h>
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#include <sha256.h>
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char hexdigits[] = "0123456789ABCDEF";
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void sha256(char *message, int len, char *hash)
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{
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SHA256_CTX sha;
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sha256_init( &sha );
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sha256_update( &sha, message, len );
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sha256_final( &sha, hash );
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}
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void sha256_curve_points(ec_point_t* points, int points_length, curve_t curve, char *hash)
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{
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SHA256_CTX sha;
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int blen = curve->bitwidth >> 3;
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char b[blen];
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sha256_init( &sha );
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for (int i=0;i<points_length;i++)
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{
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memset( b, 0x00, blen );
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mpz_export( b, NULL, -1, 1, -1, 0, points[i]->x );
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sha256_update( &sha, b, blen );
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memset( b, 0x00, blen );
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mpz_export( b, NULL, -1, 1, -1, 0, points[i]->y );
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sha256_update( &sha, b, blen );
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}
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sha256_final( &sha, hash);
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}
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char *print_hex(char *p, int len)
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{
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static char *s = NULL;
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static int slen = 0;
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int minsize = (len<<1)+1;
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if (slen < minsize)
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{
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if (s)
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free(s);
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s = malloc(minsize);
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slen = minsize;
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}
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for (int i=0; i<len; i++)
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{
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s[ (i<<1) ] = hexdigits[ (p[i]>>4) & 0x0f ];
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s[ (i<<1) +1 ]= hexdigits[ (p[i]) & 0x0f ];
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}
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s[minsize-1] = 0x00;
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return s;
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} |