Mercurial > dropbear
annotate src/pk/rsa/rsa_decrypt_key.c @ 222:36160290a1b2 libtomcrypt LTC_DB_0.46
* change include path of options.h
* don't use the constant ROL/ROR operations, since compilers
seem to have problems
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 08 Jul 2005 19:13:24 +0000 |
parents | 39d5d58461d6 |
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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://libtomcrypt.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 PKCS #1 OAEP Decryption, Tom St Denis |
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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 v2.0) decrypt then 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 stat [out] Result of the decryption, 1==valid, 0==invalid |
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30 @param key The corresponding private RSA key |
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31 @return CRYPT_OK if succcessul (even if invalid) |
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32 */ |
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33 int rsa_decrypt_key(const unsigned char *in, unsigned long inlen, |
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34 unsigned char *out, unsigned long *outlen, |
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35 const unsigned char *lparam, unsigned long lparamlen, |
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36 int hash_idx, int *stat, |
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37 rsa_key *key) |
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38 { |
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39 unsigned long modulus_bitlen, modulus_bytelen, x; |
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40 int err; |
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41 unsigned char *tmp; |
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42 |
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43 LTC_ARGCHK(out != NULL); |
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44 LTC_ARGCHK(outlen != NULL); |
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45 LTC_ARGCHK(key != NULL); |
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46 LTC_ARGCHK(stat != NULL); |
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47 |
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48 /* default to invalid */ |
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49 *stat = 0; |
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50 |
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51 /* valid hash ? */ |
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52 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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53 return err; |
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54 } |
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55 |
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56 /* get modulus len in bits */ |
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57 modulus_bitlen = mp_count_bits(&(key->N)); |
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58 |
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59 /* outlen must be at least the size of the modulus */ |
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60 modulus_bytelen = mp_unsigned_bin_size(&(key->N)); |
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61 if (modulus_bytelen != inlen) { |
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62 return CRYPT_INVALID_PACKET; |
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63 } |
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64 |
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65 /* allocate ram */ |
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66 tmp = XMALLOC(inlen); |
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67 if (tmp == NULL) { |
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68 return CRYPT_MEM; |
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69 } |
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70 |
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71 /* rsa decode the packet */ |
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72 x = inlen; |
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73 if ((err = rsa_exptmod(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) { |
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74 XFREE(tmp); |
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75 return err; |
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76 } |
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77 |
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78 /* now OAEP decode the packet */ |
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79 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx, |
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80 out, outlen, stat); |
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81 XFREE(tmp); |
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82 return err; |
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83 } |
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84 |
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85 #endif /* MRSA */ |
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86 |
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87 |
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88 |
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89 |
209 | 90 |
91 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_decrypt_key.c,v $ */ | |
92 /* $Revision: 1.3 $ */ | |
93 /* $Date: 2005/05/05 14:35:59 $ */ |