Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_decrypt_key.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +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 rsa_decrypt_key.c
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13 RSA PKCS #1 Decryption, Tom St Denis and Andreas Lange
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14 */
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15
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16 #ifdef LTC_MRSA
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17
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18 /**
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19 PKCS #1 decrypt then v1.5 or OAEP depad
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20 @param in The ciphertext
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21 @param inlen The length of the ciphertext (octets)
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22 @param out [out] The plaintext
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23 @param outlen [in/out] The max size and resulting size of the plaintext (octets)
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24 @param lparam The system "lparam" value
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25 @param lparamlen The length of the lparam value (octets)
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26 @param hash_idx The index of the hash desired
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27 @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5)
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28 @param stat [out] Result of the decryption, 1==valid, 0==invalid
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29 @param key The corresponding private RSA key
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30 @return CRYPT_OK if succcessul (even if invalid)
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31 */
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32 int rsa_decrypt_key_ex(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 int hash_idx, int padding,
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36 int *stat, rsa_key *key)
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37 {
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38 unsigned long modulus_bitlen, modulus_bytelen, x;
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39 int err;
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40 unsigned char *tmp;
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41
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42 LTC_ARGCHK(out != NULL);
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43 LTC_ARGCHK(outlen != NULL);
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44 LTC_ARGCHK(key != NULL);
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45 LTC_ARGCHK(stat != NULL);
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46
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47 /* default to invalid */
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48 *stat = 0;
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49
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50 /* valid padding? */
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51
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52 if ((padding != LTC_PKCS_1_V1_5) &&
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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53 (padding != LTC_PKCS_1_OAEP)) {
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54 return CRYPT_PK_INVALID_PADDING;
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55 }
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56
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57 if (padding == LTC_PKCS_1_OAEP) {
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58 /* valid hash ? */
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59 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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60 return err;
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61 }
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62 }
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63
285
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64 /* get modulus len in bits */
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65 modulus_bitlen = mp_count_bits( (key->N));
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66
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67 /* outlen must be at least the size of the modulus */
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68 modulus_bytelen = mp_unsigned_bin_size( (key->N));
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69 if (modulus_bytelen != inlen) {
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70 return CRYPT_INVALID_PACKET;
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71 }
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72
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73 /* allocate ram */
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74 tmp = XMALLOC(inlen);
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75 if (tmp == NULL) {
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76 return CRYPT_MEM;
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77 }
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78
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79 /* rsa decode the packet */
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80 x = inlen;
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81 if ((err = ltc_mp.rsa_me(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) {
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82 XFREE(tmp);
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83 return err;
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84 }
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85
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 if (padding == LTC_PKCS_1_OAEP) {
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87 /* now OAEP decode the packet */
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88 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx,
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89 out, outlen, stat);
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90 } else {
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91 /* now PKCS #1 v1.5 depad the packet */
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92 err = pkcs_1_v1_5_decode(tmp, x, LTC_PKCS_1_EME, modulus_bitlen, out, outlen, stat);
382
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93 }
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parents: 285
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94
285
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Matt Johnston <matt@ucc.asn.au>
parents:
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95 XFREE(tmp);
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96 return err;
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97 }
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98
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99 #endif /* LTC_MRSA */
285
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100
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101 /* ref: $Format:%D$ */
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102 /* git commit: $Format:%H$ */
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103 /* commit time: $Format:%ai$ */