Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_encrypt_key.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
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 */
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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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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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39
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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
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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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71 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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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;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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81 #endif /* LTC_MRSA */
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82
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* ref: $Format:%D$ */
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84 /* git commit: $Format:%H$ */
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85 /* commit time: $Format:%ai$ */