Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_decrypt_key.c @ 1635:c9b5017b0a7b

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drop obsolete definition for MAX_KEXHASHBUF (#65) The last code to make use of MAX_KEXHASHBUF was removed in 2005: https://github.com/mkj/dropbear/commit/736f370dce614b717193f45d084e9e009de723ce Signed-off-by: Andre McCurdy <[email protected]>
author Andre McCurdy <armccurdy@gmail.com>
date Wed, 20 Mar 2019 08:01:41 -0700
parents 6dba84798cd5
children
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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
382
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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
382
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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 */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx,
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 out, outlen, stat);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 XFREE(tmp);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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94
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
95 #endif /* LTC_MRSA */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
101 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
102 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
103 /* commit time: $Format:%ai$ */