Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 866:12d5f40894ec
Fix library order of libtom*
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 25 Nov 2013 23:39:15 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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.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_encrypt_key.c |
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15 RSA 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 MRSA |
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19 |
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20 /** |
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21 (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_PKCS_1_OAEP or 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_PKCS_1_V1_5) && |
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50 (padding != 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_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_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 /* 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_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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91 } |
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92 } |
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93 |
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94 /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */ |
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95 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key); |
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96 } |
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97 |
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98 #endif /* MRSA */ |
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99 |
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100 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */ |
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101 /* $Revision: 1.8 $ */ |
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102 /* $Date: 2006/11/01 09:18:22 $ */ |