Mercurial > dropbear

annotate src/pk/pkcs1/pkcs_1_v15_sa_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_sa_encode.c
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15 PKCS #1 v1.5 Signature Padding, 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 Perform PKCS #1 v1.5 Signature Padding
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22 @param msghash The hash you wish to incorporate in the padding
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23 @param msghashlen The length of the hash
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24 @param hash_idx The index of the hash used
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25 @param modulus_bitlen The length of the RSA modulus that will sign this (bits)
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26 @param out [out] Where to store the padded data
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27 @param outlen [in/out] Max size and resulting size of the padded data
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28 @return CRYPT_OK if successful
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29 */
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30 int pkcs_1_v15_sa_encode(const unsigned char *msghash, unsigned long msghashlen,
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31 int hash_idx, unsigned long modulus_bitlen,
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32 unsigned char *out, unsigned long *outlen)
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33 {
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34 unsigned long derlen, modulus_bytelen, x, y;
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35 int err;
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36
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37 LTC_ARGCHK(msghash != NULL)
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38 LTC_ARGCHK(out != NULL);
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39 LTC_ARGCHK(outlen != NULL);
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40
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41 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 /* hack, to detect any hash without a DER OID */
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46 if (hash_descriptor[hash_idx].DERlen == 0) {
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47 return CRYPT_INVALID_ARG;
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48 }
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49
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50 /* get modulus len */
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51 modulus_bytelen = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0);
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52
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53 /* get der len ok? Forgive my lame German accent.... */
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54 derlen = hash_descriptor[hash_idx].DERlen;
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55
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56 /* valid sizes? */
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57 if (msghashlen + 3 + derlen > modulus_bytelen) {
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58 return CRYPT_PK_INVALID_SIZE;
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59 }
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60
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61 if (*outlen < modulus_bytelen) {
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62 return CRYPT_BUFFER_OVERFLOW;
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63 }
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64
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65 /* packet is 0x00 0x01 PS 0x00 T, where PS == 0xFF repeated modulus_bytelen - 3 - derlen - msghashlen times, T == DER || hash */
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66 x = 0;
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67 out[x++] = 0x00;
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68 out[x++] = 0x01;
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69 for (y = 0; y < (modulus_bytelen - 3 - derlen - msghashlen); y++) {
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70 out[x++] = 0xFF;
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71 }
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72 out[x++] = 0x00;
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73 for (y = 0; y < derlen; y++) {
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74 out[x++] = hash_descriptor[hash_idx].DER[y];
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75 }
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76 for (y = 0; y < msghashlen; y++) {
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77 out[x++] = msghash[y];
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78 }
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79
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80 *outlen = modulus_bytelen;
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81 return CRYPT_OK;
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82 }
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83
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84 #endif /* PKCS_1 */