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annotate src/pk/rsa/rsa_import.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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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_import.c
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15 Import a PKCS RSA key, 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 Import an RSAPublicKey or RSAPrivateKey [two-prime only, defined in PKCS #1 v2.1]
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22 @param in The packet to import from
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23 @param inlen It's length (octets)
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24 @param key [out] Destination for newly imported key
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25 @return CRYPT_OK if successful, upon error allocated memory is freed
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26 */
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27 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
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28 {
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29 unsigned long x, y;
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30 int err;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(key != NULL);
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34
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35 /* init key */
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36 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP,
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37 &key->p, &key->q, NULL)) != MP_OKAY) {
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38 return mpi_to_ltc_error(err);
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39 }
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40
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41 /* check the header */
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42 if (inlen < 4) {
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43 return CRYPT_INVALID_PACKET;
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44 }
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45
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46 /* should be 0x30 0x8{1|2} LL LL */
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47 if ((in[0] != 0x30) || ((in[1] != 0x81) && (in[1] != 0x82))) {
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48 return CRYPT_INVALID_PACKET;
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49 }
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50
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51 /* ok all the ASN.1 params are fine so far, let's move up */
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52 x = ((unsigned long)in[2]);
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53 y = 0;
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54 if ((in[1] & ~0x80) == 2) {
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55 x = (x << 8) + ((unsigned long)in[3]) + 1;
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56 in += 1;
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57 y = 1;
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58 }
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59 in += 3; /* advance input */
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60 x += 3; /* size of packet according to header */
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61 y += 3; /* used input */
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62
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63 if (x != inlen) {
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64 return CRYPT_INVALID_PACKET;
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65 }
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66
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67 /* decrement inlen by the header size */
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68 inlen -= y;
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69
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70 /* read first number, it's either N or 0 [0 == private key] */
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71 x = inlen;
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72 if ((err = der_get_multi_integer(in, &x, &key->N, NULL)) != CRYPT_OK) {
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73 goto LBL_ERR;
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74 }
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75
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76 /* advance */
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77 inlen -= x;
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78 in += x;
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79
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80 if (mp_cmp_d(&key->N, 0) == MP_EQ) {
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81 /* it's a private key */
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82 if ((err = der_get_multi_integer(in, &inlen, &key->N, &key->e,
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83 &key->d, &key->p, &key->q, &key->dP,
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84 &key->dQ, &key->qP, NULL)) != CRYPT_OK) {
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85 goto LBL_ERR;
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86 }
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87
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88 key->type = PK_PRIVATE;
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89 } else if (mp_cmp_d(&key->N, 1) == MP_EQ) {
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90 /* we don't support multi-prime RSA */
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91 err = CRYPT_PK_INVALID_TYPE;
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92 goto LBL_ERR;
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93 } else {
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94 /* it's a public key and we lack e */
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95 if ((err = der_get_multi_integer(in, &inlen, &key->e, NULL)) != CRYPT_OK) {
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96 goto LBL_ERR;
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97 }
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98
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99 /* free up some ram */
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100 mp_clear_multi(&key->p, &key->q, &key->qP, &key->dP, &key->dQ, NULL);
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101
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102 key->type = PK_PUBLIC;
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103 }
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104 return CRYPT_OK;
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105 LBL_ERR:
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106 mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,
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107 &key->qP, &key->p, &key->q, NULL);
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108 return err;
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109 }
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110
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111 #endif /* MRSA */
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112