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use bit shifts

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shimun 2020-06-14 16:49:43 +02:00
parent 4743fd2326
commit 72063049a7
Signed by: shimun
GPG Key ID: E81D8382DC2F971B
1 changed files with 8 additions and 5 deletions
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13
fido2/ctap.c
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@ -597,18 +597,21 @@ static uint32_t ctap_assertion_led_colour(uint8_t * seed, uint32_t slen)
crypto_sha256_hmac_final(seed, slen, hmac); crypto_sha256_hmac_final(seed, slen, hmac);
uint32_t colour = 0; uint32_t colour = 0;
uint32_t backlist[] = {0x00FF00}; uint32_t backlist[] = {0x00FF00};
uint32_t dist = 0; int dist = 0;
uint32_t min_dist = 40*40*3; int min_dist = 50*50*3;
for(int i=0; i<32-3 && (dist < min_dist || i == 0);i++) { for(int i=0; i<32-3 && (dist < min_dist || i == 0);i++) {
uint8_t* rgb = &hmac[i]; uint8_t* rgb = &hmac[i];
colour = ((uint32_t*) rgb)[0] & 0x0000ffffff; colour = ((uint32_t*) rgb)[0] & 0x0000ffffff;
uint32_t r, g, b = 0; int r, g, b = 0;
r = colour & 0x0000ff0000 >> 16; r = colour & 0x0000ff0000 >> 16;
g = colour & 0x000000ff00 >> 8; g = colour & 0x000000ff00 >> 8;
b = colour & 0x00000000ff; b = colour & 0x00000000ff;
for(int j=0; j < 1 && dist < min_dist; j++) { for(int j=0; j < 1 && dist < min_dist; j++) {
uint8_t* b_rgb = &((uint8_t*) &backlist[j])[1]; int br, bg, bb = 0;
dist = ((int) r - b_rgb[2])*(r - b_rgb[2]) + ((int)g - b_rgb[1])*((int)g - b_rgb[1]) + ((int)b - b_rgb[0])*((int)b - b_rgb[0]); br = backlist[j] & 0x0000ff0000 >> 16;
bg = backlist[j] & 0x000000ff00 >> 8;
bb = backlist[j] & 0x00000000ff;
dist = ((int) r - br)*(r - br) + ((int)g - bg)*((int)g - bg) + ((int)b - bb)*((int)b - bb);
} }
} }