Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_decrypt_key.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
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
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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:
diff changeset
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: $Format:%ai$ */