Mercurial > dropbear

annotate src/pk/rsa/rsa_export.c @ 199:8be64e2c86f4 libtomcrypt

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* SMALL_CODE is now LTC_SMALL_CODE
author Matt Johnston <matt@ucc.asn.au>
date Tue, 10 May 2005 17:02:59 +0000
parents 1c15b283127b
children 39d5d58461d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 rsa_export.c
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15 Export RSA PKCS keys, Tom St Denis
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16 */
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17
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18 #ifdef MRSA
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19
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20 /**
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21 This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1]
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22 @param out [out] Destination of the packet
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23 @param outlen [in/out] The max size and resulting size of the packet
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24 @param type The type of exported key (PK_PRIVATE or PK_PUBLIC)
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25 @param key The RSA key to export
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26 @return CRYPT_OK if successful
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27 */
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28 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
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29 {
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30 int err, x;
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31
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34 LTC_ARGCHK(key != NULL);
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35
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36 /* type valid? */
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37 if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
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38 return CRYPT_PK_INVALID_TYPE;
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39 }
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40 if (*outlen < 4) {
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41 return CRYPT_BUFFER_OVERFLOW;
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42 }
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43
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44 /* Mental Note: push space for the header 0x30 0x82 LL LL (LL = length of packet EXcluding 4 bytes)
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45 * we assume LL > 255 which is true since the smallest RSA key has a 128-byte modulus (1024-bit)
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46 */
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47 *outlen -= 4;
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48
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49 if (type == PK_PRIVATE) {
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50 /* private key */
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51 mp_int zero;
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52
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53 /* first INTEGER == 0 to signify two-prime RSA */
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54 if ((err = mp_init(&zero)) != MP_OKAY) {
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55 return mpi_to_ltc_error(err);
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56 }
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57
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58 /* output is
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59 Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
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60 */
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61 if ((err = der_put_multi_integer(
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62 out+4, outlen, &zero, &key->N, &key->e,
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63 &key->d, &key->p, &key->q, &key->dP,
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64 &key->dQ, &key->qP, NULL)) != CRYPT_OK) {
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65 mp_clear(&zero);
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66 return err;
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67 }
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68
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69 /* clear zero and return */
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70 mp_clear(&zero);
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71 } else {
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72 /* public key */
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73 if ((err = der_put_multi_integer(out+4, outlen, &key->N, &key->e, NULL)) != CRYPT_OK) {
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74 return err;
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75 }
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76 }
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77
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78 /* store the header */
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79 out[0] = 0x30;
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80 if (*outlen < 256) {
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81 /* shift the output up one byte if the header is only 3 bytes */
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82 for (x = 0; x < *outlen; x++) {
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83 out[x+3] = out[x+4];
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84 }
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85 out[1] = 0x81;
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86 out[2] = (*outlen & 255);
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87 *outlen += 3;
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88 } else {
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89 out[1] = 0x82;
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90 out[2] = (*outlen >> 8) & 255;
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91 out[3] = (*outlen & 255);
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92 *outlen += 4;
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93 }
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94 return err;
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95 }
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96
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97 #endif /* MRSA */
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98