Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_encrypt_key.c @ 1593:c8c20fb57a9a

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Don't read uninitialised value. From https://github.com/libtom/libtommath/commit/1d03522625f46214733e8e143a4765c01fc146f9
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 16:50:24 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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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83 /* ref: $Format:%D$ */
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84 /* git commit: $Format:%H$ */
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85 /* commit time: $Format:%ai$ */