dropbearconvert: keyimport.c: fix BER encoding of secp521r1 keys (#69) keysizes >= 128 octets will be encoded with a 3 byte header which must be accounted by the optional-header Reproduce: master:~/build/dropbear$ ./dropbearkey -t ecdsa -s 521 -f K Generating 521 bit ecdsa key, this may take a while... master:~/build/dropbear$ ./dropbearconvert d o K L Key is a ecdsa-sha2-nistp521 key Wrote key to 'L' master:~/build/dropbear$ openssl ec < L read EC key unable to load Key 139769806448384:error:0D07209B:asn1 encoding routines:ASN1_get_object:too long:crypto/asn1/asn1_lib.c:91:

#include <stdio.h>

int main(void)
{
   char buf[4096];
   int x;
   
   while (fgets(buf, sizeof(buf)-2, stdin) != NULL) {
        for (x = 0; x < 128; ) {
            printf("0x%c%c, ", buf[x], buf[x+1]);
            if (!((x += 2) & 31)) printf("\n");
        }
   }
}


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