Mercurial > dropbear

annotate src/pk/rsa/rsa_decrypt_key.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
parents 59400faa4b44
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 * Tom St Denis, [email protected], http://libtomcrypt.com
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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 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 MRSA
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19
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20 /**
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21 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_PKCS_1_OAEP or 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_PKCS_1_V1_5) &&
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55 (padding != 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_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_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 PKCS #1 v1.5 depad the packet */
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94 err = pkcs_1_v1_5_decode(tmp, x, 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 /* MRSA */
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102
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103 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_decrypt_key.c,v $ */
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104 /* $Revision: 1.8 $ */
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105 /* $Date: 2006/11/01 09:18:22 $ */