Mercurial > dropbear
annotate libtomcrypt/src/pk/katja/katja_decrypt_key.c @ 1728:01fb08c43b85
merge
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 23 Jun 2020 22:25:57 +0800 |
parents | 6dba84798cd5 |
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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 katja_decrypt_key.c |
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13 Katja PKCS #1 OAEP Decryption, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MKAT |
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17 |
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18 /** |
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19 (PKCS #1 v2.0) decrypt then OAEP depad |
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20 @param in The ciphertext |
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21 @param inlen The length of the ciphertext (octets) |
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22 @param out [out] The plaintext |
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23 @param outlen [in/out] The max size and resulting size of the plaintext (octets) |
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24 @param lparam The system "lparam" value |
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25 @param lparamlen The length of the lparam value (octets) |
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26 @param hash_idx The index of the hash desired |
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27 @param stat [out] Result of the decryption, 1==valid, 0==invalid |
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28 @param key The corresponding private Katja key |
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29 @return CRYPT_OK if succcessul (even if invalid) |
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30 */ |
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31 int katja_decrypt_key(const unsigned char *in, unsigned long inlen, |
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32 unsigned char *out, unsigned long *outlen, |
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33 const unsigned char *lparam, unsigned long lparamlen, |
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34 int hash_idx, int *stat, |
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35 katja_key *key) |
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36 { |
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37 unsigned long modulus_bitlen, modulus_bytelen, x; |
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38 int err; |
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39 unsigned char *tmp; |
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40 |
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41 LTC_ARGCHK(out != NULL); |
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42 LTC_ARGCHK(outlen != NULL); |
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43 LTC_ARGCHK(key != NULL); |
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44 LTC_ARGCHK(stat != NULL); |
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45 |
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46 /* default to invalid */ |
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47 *stat = 0; |
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48 |
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49 /* valid hash ? */ |
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50 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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51 return err; |
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52 } |
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53 |
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54 /* get modulus len in bits */ |
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55 modulus_bitlen = mp_count_bits( (key->N)); |
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56 |
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57 /* payload is upto pq, so we know q is 1/3rd the size of N and therefore pq is 2/3th the size */ |
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58 modulus_bitlen = ((modulus_bitlen << 1) / 3); |
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59 |
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60 /* round down to next byte */ |
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61 modulus_bitlen -= (modulus_bitlen & 7) + 8; |
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62 |
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63 /* outlen must be at least the size of the modulus */ |
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64 modulus_bytelen = mp_unsigned_bin_size( (key->N)); |
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65 if (modulus_bytelen != inlen) { |
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66 return CRYPT_INVALID_PACKET; |
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67 } |
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68 |
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69 /* allocate ram */ |
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70 tmp = XMALLOC(inlen); |
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71 if (tmp == NULL) { |
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72 return CRYPT_MEM; |
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73 } |
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74 |
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75 /* rsa decode the packet */ |
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76 x = inlen; |
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77 if ((err = katja_exptmod(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) { |
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78 XFREE(tmp); |
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79 return err; |
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80 } |
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81 |
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82 /* shift right by modulus_bytelen - modulus_bitlen/8 bytes */ |
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83 for (x = 0; x < (modulus_bitlen >> 3); x++) { |
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84 tmp[x] = tmp[x+(modulus_bytelen-(modulus_bitlen>>3))]; |
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85 } |
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86 |
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87 /* now OAEP decode the packet */ |
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88 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx, |
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89 out, outlen, stat); |
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90 |
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91 XFREE(tmp); |
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92 return err; |
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93 } |
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94 |
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95 #endif /* LTC_MRSA */ |
382
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96 |
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97 |
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98 |
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99 |
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100 |
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101 /* ref: $Format:%D$ */ |
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102 /* git commit: $Format:%H$ */ |
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103 /* commit time: $Format:%ai$ */ |