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#include <openssl/ecdsa.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char * argv[]) {
int rbytes, sbytes, len, n;
ECDSA_SIG *ecSig;
unsigned char *p, *end;
const unsigned char *start;
unsigned char der[512];
unsigned char out[64];
p = der;
end = &der[sizeof(der)];
for ( ;; ) {
n = read(STDIN_FILENO, der, end - p);
if (n == 0) {
break;
}
if ((end - p) == 0) {
printf("too large (> 512) der length in stdin");
return EXIT_FAILURE;
}
p += n;
}
start = der;
ecSig = d2i_ECDSA_SIG(NULL, &start, p - der);
if (ecSig == NULL) {
printf("d2i_ECDSA_SIG() failed");
return EXIT_FAILURE;
}
rbytes = BN_num_bytes(ECDSA_SIG_get0_r(ecSig));
sbytes = BN_num_bytes(ECDSA_SIG_get0_s(ecSig));
BN_bn2binpad(ECDSA_SIG_get0_r(ecSig), out, rbytes);
BN_bn2binpad(ECDSA_SIG_get0_s(ecSig), &out[32], sbytes);
write(STDOUT_FILENO, out, sizeof(out));
return EXIT_SUCCESS;
}
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