Mercurial > dropbear
annotate libtomcrypt/src/pk/dh/dh_import.c @ 1572:56ec2214144f
no werror for fuzzing clang
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 02 Mar 2018 00:11:27 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 |
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10 #include "tomcrypt.h" |
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11 |
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12 #ifdef LTC_MDH |
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13 |
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14 /** |
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15 Import a DH key from a binary packet |
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16 @param in The packet to read |
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17 @param inlen The length of the input packet |
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18 @param key [out] Where to import the key to |
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19 @return CRYPT_OK if successful, on error all allocated memory is freed automatically |
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20 */ |
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21 int dh_import(const unsigned char *in, unsigned long inlen, dh_key *key) |
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22 { |
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23 unsigned char flags[1]; |
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24 int err; |
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25 unsigned long version; |
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26 |
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27 LTC_ARGCHK(in != NULL); |
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28 LTC_ARGCHK(key != NULL); |
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29 |
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30 /* init */ |
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31 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) { |
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32 return err; |
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33 } |
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34 |
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35 /* find out what type of key it is */ |
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36 err = der_decode_sequence_multi(in, inlen, |
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37 LTC_ASN1_SHORT_INTEGER, 1UL, &version, |
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38 LTC_ASN1_BIT_STRING, 1UL, &flags, |
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39 LTC_ASN1_EOL, 0UL, NULL); |
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40 if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) { |
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41 goto error; |
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42 } |
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43 |
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44 if (version == 0) { |
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45 if (flags[0] == 1) { |
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46 key->type = PK_PRIVATE; |
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47 if ((err = der_decode_sequence_multi(in, inlen, |
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48 LTC_ASN1_SHORT_INTEGER, 1UL, &version, |
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49 LTC_ASN1_BIT_STRING, 1UL, flags, |
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50 LTC_ASN1_INTEGER, 1UL, key->prime, |
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51 LTC_ASN1_INTEGER, 1UL, key->base, |
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52 LTC_ASN1_INTEGER, 1UL, key->x, |
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53 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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54 goto error; |
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55 } |
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56 /* compute public key: y = (base ^ x) mod prime */ |
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57 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { |
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58 goto error; |
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59 } |
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60 } |
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61 else if (flags[0] == 0) { |
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62 key->type = PK_PUBLIC; |
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63 if ((err = der_decode_sequence_multi(in, inlen, |
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64 LTC_ASN1_SHORT_INTEGER, 1UL, &version, |
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65 LTC_ASN1_BIT_STRING, 1UL, flags, |
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66 LTC_ASN1_INTEGER, 1UL, key->prime, |
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67 LTC_ASN1_INTEGER, 1UL, key->base, |
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68 LTC_ASN1_INTEGER, 1UL, key->y, |
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69 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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70 goto error; |
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71 } |
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72 } |
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73 else { |
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74 err = CRYPT_INVALID_PACKET; |
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75 goto error; |
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76 } |
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77 } |
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78 else { |
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79 err = CRYPT_INVALID_PACKET; |
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80 goto error; |
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81 } |
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82 |
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83 /* check public key */ |
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84 if ((err = dh_check_pubkey(key)) != CRYPT_OK) { |
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85 goto error; |
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86 } |
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87 |
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88 return CRYPT_OK; |
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89 |
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90 error: |
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91 dh_free(key); |
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92 return err; |
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93 } |
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94 |
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95 #endif /* LTC_MDH */ |
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96 |
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97 /* ref: $Format:%D$ */ |
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98 /* git commit: $Format:%H$ */ |
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99 /* commit time: $Format:%ai$ */ |