Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_decrypt_key.c @ 1464:ad637c9e0f6f
Server chosen tcpfwd ports (#43)
Server chosen tcpfwd ports
author | houseofkodai <karthik@houseofkodai.in> |
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date | Thu, 25 Jan 2018 19:51:41 +0530 |
parents | f849a5ca2efc |
children | 6dba84798cd5 |
rev | line source |
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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_decrypt_key.c |
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15 RSA LTC_PKCS #1 Decryption, 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 decrypt then v1.5 or OAEP depad |
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22 @param in The ciphertext |
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23 @param inlen The length of the ciphertext (octets) |
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24 @param out [out] The plaintext |
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25 @param outlen [in/out] The max size and resulting size of the plaintext (octets) |
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26 @param lparam The system "lparam" value |
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27 @param lparamlen The length of the lparam value (octets) |
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28 @param hash_idx The index of the hash desired |
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29 @param padding Type of padding (LTC_LTC_PKCS_1_OAEP or LTC_LTC_PKCS_1_V1_5) |
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30 @param stat [out] Result of the decryption, 1==valid, 0==invalid |
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31 @param key The corresponding private RSA key |
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32 @return CRYPT_OK if succcessul (even if invalid) |
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33 */ |
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34 int rsa_decrypt_key_ex(const unsigned char *in, unsigned long inlen, |
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35 unsigned char *out, unsigned long *outlen, |
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36 const unsigned char *lparam, unsigned long lparamlen, |
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37 int hash_idx, int padding, |
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38 int *stat, 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 unsigned char *tmp; |
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43 |
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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 LTC_ARGCHK(stat != NULL); |
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48 |
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49 /* default to invalid */ |
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50 *stat = 0; |
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51 |
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52 /* valid padding? */ |
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53 |
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54 if ((padding != LTC_LTC_PKCS_1_V1_5) && |
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55 (padding != LTC_LTC_PKCS_1_OAEP)) { |
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56 return CRYPT_PK_INVALID_PADDING; |
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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 != inlen) { |
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72 return CRYPT_INVALID_PACKET; |
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73 } |
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74 |
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75 /* allocate ram */ |
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76 tmp = XMALLOC(inlen); |
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77 if (tmp == NULL) { |
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78 return CRYPT_MEM; |
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79 } |
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80 |
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81 /* rsa decode the packet */ |
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82 x = inlen; |
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83 if ((err = ltc_mp.rsa_me(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) { |
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84 XFREE(tmp); |
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85 return err; |
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86 } |
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87 |
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88 if (padding == LTC_LTC_PKCS_1_OAEP) { |
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89 /* now OAEP decode the packet */ |
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90 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx, |
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91 out, outlen, stat); |
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92 } else { |
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93 /* now LTC_PKCS #1 v1.5 depad the packet */ |
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94 err = pkcs_1_v1_5_decode(tmp, x, LTC_LTC_PKCS_1_EME, modulus_bitlen, out, outlen, stat); |
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95 } |
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96 |
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97 XFREE(tmp); |
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98 return err; |
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99 } |
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100 |
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101 #endif /* LTC_MRSA */ |
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102 |
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103 /* $Source$ */ |
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104 /* $Revision$ */ |
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105 /* $Date$ */ |