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annotate libtomcrypt/src/pk/dh/dh_import.c @ 1889:fc4c9ef61856

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Split CPPFLAGS and CFLAGS more carefully This has no change to the build, but makes it easier to try other build tools that only want CPPFLAGS
author Matt Johnston <matt@ucc.asn.au>
date Tue, 22 Mar 2022 16:17:05 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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47 if ((err = der_decode_sequence_multi(in, inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87
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88 return CRYPT_OK;
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89
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 error:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */