Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_encrypt_key.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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_encrypt_key.c
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13 Katja PKCS-style OAEP encryption, Tom St Denis
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14 */
382
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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) OAEP pad then encrypt
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20 @param in The plaintext
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21 @param inlen The length of the plaintext (octets)
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22 @param out [out] The ciphertext
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23 @param outlen [in/out] The max size and resulting size of the ciphertext
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24 @param lparam The system "lparam" for the encryption
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25 @param lparamlen The length of lparam (octets)
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26 @param prng An active PRNG
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27 @param prng_idx The index of the desired prng
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28 @param hash_idx The index of the desired hash
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29 @param key The Katja key to encrypt to
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30 @return CRYPT_OK if successful
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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31 */
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32 int katja_encrypt_key(const unsigned char *in, unsigned long inlen,
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33 unsigned char *out, unsigned long *outlen,
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34 const unsigned char *lparam, unsigned long lparamlen,
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35 prng_state *prng, int prng_idx, int hash_idx, 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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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39
382
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40 LTC_ARGCHK(in != NULL);
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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
382
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45 /* valid prng and hash ? */
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46 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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47 return err;
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48 }
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49 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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50 return err;
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51 }
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52
382
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53 /* get modulus len in bits */
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54 modulus_bitlen = mp_count_bits((key->N));
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55
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56 /* 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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57 modulus_bitlen = ((modulus_bitlen << 1) / 3);
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58
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59 /* round down to next byte */
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60 modulus_bitlen -= (modulus_bitlen & 7) + 8;
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61
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62 /* outlen must be at least the size of the modulus */
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63 modulus_bytelen = mp_unsigned_bin_size((key->N));
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64 if (modulus_bytelen > *outlen) {
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65 *outlen = modulus_bytelen;
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66 return CRYPT_BUFFER_OVERFLOW;
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67 }
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68
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69 /* OAEP pad the key */
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70 x = *outlen;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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71 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
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73 out, &x)) != CRYPT_OK) {
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74 return err;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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75 }
382
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76
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77 /* Katja exptmod the OAEP pad */
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78 return katja_exptmod(out, x, out, outlen, PK_PUBLIC, key);
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79 }
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80
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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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81 #endif /* LTC_MRSA */
382
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82
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 /* commit time: $Format:%ai$ */