Mercurial > dropbear

annotate src/pk/pkcs1/pkcs_1_v15_es_encode.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +0000
parents 1c15b283127b
children
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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 "tomcrypt.h"
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12
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13 /**
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14 @file pkcs_1_v15_es_encode.c
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15 v1.5 Encryption Padding for PKCS #1, Tom St Denis
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16 */
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17
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18 #ifdef PKCS_1
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19
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20 /**
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21 PKCS #1 v1.5 Encryption Padding
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22 @param msg The data to encode
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23 @param msglen The length of the data (octets)
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24 @param modulus_bitlen The bit length of the RSA modulus
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25 @param prng An active PRNG
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26 @param prng_idx The index of the PRNG desired
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27 @param out [out] The destination of the padding
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28 @param outlen [in/out] The max size and resulting size of the padding
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29 @return CRYPT_OK if successful
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30 */
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31 int pkcs_1_v15_es_encode(const unsigned char *msg, unsigned long msglen,
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32 unsigned long modulus_bitlen,
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33 prng_state *prng, int prng_idx,
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34 unsigned char *out, unsigned long *outlen)
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35 {
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36 unsigned long modulus_bytelen, x, y;
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37
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38 LTC_ARGCHK(msg != NULL);
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39 LTC_ARGCHK(out != NULL);
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40 LTC_ARGCHK(outlen != NULL);
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41
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42 /* get modulus len */
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43 modulus_bytelen = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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44 if (modulus_bytelen < 12) {
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45 return CRYPT_INVALID_ARG;
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46 }
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47
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48 /* verify length */
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49 if (msglen > (modulus_bytelen - 11) || *outlen < modulus_bytelen) {
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50 return CRYPT_PK_INVALID_SIZE;
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51 }
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52
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53 /* 0x00 0x02 PS 0x00 M */
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54 x = 0;
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55 out[x++] = 0x00;
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56 out[x++] = 0x02;
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57 y = modulus_bytelen - msglen - 3;
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58 if (prng_descriptor[prng_idx].read(out+x, y, prng) != y) {
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59 return CRYPT_ERROR_READPRNG;
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60 }
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61 x += y;
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62 out[x++] = 0x00;
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63 XMEMCPY(out+x, msg, msglen);
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64 *outlen = modulus_bytelen;
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65
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66 return CRYPT_OK;
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67 }
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68
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69 #endif /* PKCS_1 */