Mercurial > dropbear
annotate libtomcrypt/src/mac/hmac/hmac_init.c @ 1659:d32bcb5c557d
Add Ed25519 support (#91)
* Add support for Ed25519 as a public key type
Ed25519 is a elliptic curve signature scheme that offers
better security than ECDSA and DSA and good performance. It may be
used for both user and host keys.
OpenSSH key import and fuzzer are not supported yet.
Initially inspired by Peter Szabo.
* Add curve25519 and ed25519 fuzzers
* Add import and export of Ed25519 keys
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
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date | Wed, 11 Mar 2020 21:09:45 +0500 |
parents | 6dba84798cd5 |
children | 1ff2a1034c52 |
rev | line source |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file hmac_init.c |
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13 HMAC support, initialize state, Tom St Denis/Dobes Vandermeer |
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14 */ |
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15 |
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16 #ifdef LTC_HMAC |
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17 |
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18 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize |
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19 |
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20 /** |
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21 Initialize an HMAC context. |
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22 @param hmac The HMAC state |
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23 @param hash The index of the hash you want to use |
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24 @param key The secret key |
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25 @param keylen The length of the secret key (octets) |
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26 @return CRYPT_OK if successful |
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27 */ |
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28 int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen) |
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29 { |
1056 | 30 unsigned char buf[MAXBLOCKSIZE]; |
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31 unsigned long hashsize; |
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32 unsigned long i, z; |
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33 int err; |
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34 |
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35 LTC_ARGCHK(hmac != NULL); |
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36 LTC_ARGCHK(key != NULL); |
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37 |
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38 /* valid hash? */ |
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39 if ((err = hash_is_valid(hash)) != CRYPT_OK) { |
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40 return err; |
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41 } |
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42 hmac->hash = hash; |
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43 hashsize = hash_descriptor[hash].hashsize; |
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44 |
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45 /* valid key length? */ |
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46 if (keylen == 0) { |
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47 return CRYPT_INVALID_KEYSIZE; |
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48 } |
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49 |
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50 /* allocate memory for key */ |
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51 hmac->key = XMALLOC(LTC_HMAC_BLOCKSIZE); |
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52 if (hmac->key == NULL) { |
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53 return CRYPT_MEM; |
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54 } |
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55 |
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56 /* (1) make sure we have a large enough key */ |
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57 if(keylen > LTC_HMAC_BLOCKSIZE) { |
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58 z = LTC_HMAC_BLOCKSIZE; |
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59 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) { |
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60 goto LBL_ERR; |
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61 } |
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62 keylen = hashsize; |
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63 } else { |
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64 XMEMCPY(hmac->key, key, (size_t)keylen); |
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65 } |
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66 |
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67 if(keylen < LTC_HMAC_BLOCKSIZE) { |
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68 zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen)); |
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69 } |
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70 |
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71 /* Create the initialization vector for step (3) */ |
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72 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) { |
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73 buf[i] = hmac->key[i] ^ 0x36; |
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74 } |
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75 |
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76 /* Pre-pend that to the hash data */ |
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77 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) { |
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78 goto LBL_ERR; |
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79 } |
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80 |
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81 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) { |
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82 goto LBL_ERR; |
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83 } |
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84 goto done; |
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85 LBL_ERR: |
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86 /* free the key since we failed */ |
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87 XFREE(hmac->key); |
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88 done: |
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89 #ifdef LTC_CLEAN_STACK |
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90 zeromem(buf, LTC_HMAC_BLOCKSIZE); |
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91 #endif |
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92 |
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93 return err; |
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94 } |
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95 |
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96 #endif |
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97 |
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98 /* ref: $Format:%D$ */ |
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99 /* git commit: $Format:%H$ */ |
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100 /* commit time: $Format:%ai$ */ |