Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 1461:fb90a5ba84e0

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Merge pull request #49 from fperrad/20170812_lint Some linting, const parameters
author Matt Johnston <matt@ucc.asn.au>
date Thu, 25 Jan 2018 21:55:25 +0800
parents f849a5ca2efc
children 6dba84798cd5
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 * Tom St Denis, [email protected], http://libtom.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file rsa_encrypt_key.c
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15 RSA LTC_PKCS #1 encryption, Tom St Denis and Andreas Lange
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16 */
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17
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18 #ifdef LTC_MRSA
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19
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20 /**
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21 (LTC_PKCS #1 v2.0) OAEP pad then encrypt
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22 @param in The plaintext
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23 @param inlen The length of the plaintext (octets)
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24 @param out [out] The ciphertext
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25 @param outlen [in/out] The max size and resulting size of the ciphertext
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26 @param lparam The system "lparam" for the encryption
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27 @param lparamlen The length of lparam (octets)
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28 @param prng An active PRNG
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29 @param prng_idx The index of the desired prng
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30 @param hash_idx The index of the desired hash
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31 @param padding Type of padding (LTC_LTC_PKCS_1_OAEP or LTC_LTC_PKCS_1_V1_5)
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32 @param key The RSA key to encrypt to
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33 @return CRYPT_OK if successful
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34 */
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35 int rsa_encrypt_key_ex(const unsigned char *in, unsigned long inlen,
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36 unsigned char *out, unsigned long *outlen,
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37 const unsigned char *lparam, unsigned long lparamlen,
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38 prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key)
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39 {
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40 unsigned long modulus_bitlen, modulus_bytelen, x;
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41 int err;
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42
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43 LTC_ARGCHK(in != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46 LTC_ARGCHK(key != NULL);
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47
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48 /* valid padding? */
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49 if ((padding != LTC_LTC_PKCS_1_V1_5) &&
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50 (padding != LTC_LTC_PKCS_1_OAEP)) {
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51 return CRYPT_PK_INVALID_PADDING;
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52 }
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53
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54 /* valid prng? */
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55 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 if (padding == LTC_LTC_PKCS_1_OAEP) {
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60 /* valid hash? */
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61 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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62 return err;
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63 }
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64 }
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65
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66 /* get modulus len in bits */
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67 modulus_bitlen = mp_count_bits( (key->N));
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68
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69 /* outlen must be at least the size of the modulus */
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70 modulus_bytelen = mp_unsigned_bin_size( (key->N));
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71 if (modulus_bytelen > *outlen) {
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72 *outlen = modulus_bytelen;
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73 return CRYPT_BUFFER_OVERFLOW;
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74 }
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75
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76 if (padding == LTC_LTC_PKCS_1_OAEP) {
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77 /* OAEP pad the key */
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78 x = *outlen;
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79 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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80 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
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81 out, &x)) != CRYPT_OK) {
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82 return err;
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83 }
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84 } else {
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85 /* LTC_PKCS #1 v1.5 pad the key */
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86 x = *outlen;
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87 if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_LTC_PKCS_1_EME,
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88 modulus_bitlen, prng, prng_idx,
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89 out, &x)) != CRYPT_OK) {
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90 return err;
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parents: 285
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91 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents: 285
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92 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents: 285
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93
1435
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parents: 382
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94 /* rsa exptmod the OAEP or LTC_PKCS #1 v1.5 pad */
382
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Matt Johnston <matt@ucc.asn.au>
parents: 285
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95 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key);
285
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parents:
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96 }
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97
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98 #endif /* LTC_MRSA */
285
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99
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100 /* $Source$ */
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101 /* $Revision$ */
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102 /* $Date$ */