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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 #include <stdarg.h> |
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12 #include "mycrypt.h" |
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13 |
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14 /* store multiple mp_ints in DER INTEGER format to the dst, will not |
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15 * overflow the length you give it [outlen] and store the number of |
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16 * bytes used in [outlen] |
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17 */ |
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18 int der_put_multi_integer(unsigned char *dst, unsigned long *outlen, |
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19 mp_int *num, ...) |
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20 { |
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21 va_list args; |
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22 mp_int *next; |
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23 unsigned long wrote, len; |
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24 int err; |
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25 |
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26 _ARGCHK(dst != NULL); |
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27 _ARGCHK(outlen != NULL); |
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28 |
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29 /* setup va list */ |
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30 next = num; |
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31 len = *outlen; |
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32 wrote = 0; |
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33 va_start(args, num); |
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34 |
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35 while (next != NULL) { |
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36 if ((err = der_encode_integer(next, dst, outlen)) != CRYPT_OK) { |
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37 va_end(args); |
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38 return err; |
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39 } |
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40 wrote += *outlen; |
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41 dst += *outlen; |
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42 len -= *outlen; |
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43 *outlen = len; |
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44 next = va_arg(args, mp_int*); |
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45 } |
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46 va_end(args); |
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47 *outlen = wrote; |
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48 return CRYPT_OK; |
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49 } |
