Mercurial > dropbear
annotate libtomcrypt/src/pk/katja/katja_encrypt_key.c @ 1899:ab9c5467970d
Merge pull request #152 from HansH111/tracelevel2
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 23 Mar 2022 21:55:33 +0800 |
parents | 6dba84798cd5 |
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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 |
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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 } |
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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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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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82 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
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83 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
84 /* 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
|
85 /* commit time: $Format:%ai$ */ |