Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 1515:d68d61e7056a
include config.h for options.h. don't need to include options.h when
includes.h brings it in
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 18 Feb 2018 11:22:13 +0800 |
parents | 6dba84798cd5 |
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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_encrypt_key.c |
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13 RSA PKCS #1 encryption, 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 v2.0) OAEP pad then encrypt |
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20 @param in The plaintext |
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21 @param inlen The length of the plaintext (octets) |
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22 @param out [out] The ciphertext |
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23 @param outlen [in/out] The max size and resulting size of the ciphertext |
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24 @param lparam The system "lparam" for the encryption |
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25 @param lparamlen The length of lparam (octets) |
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26 @param prng An active PRNG |
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27 @param prng_idx The index of the desired prng |
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28 @param hash_idx The index of the desired hash |
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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 key The RSA key to encrypt to |
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31 @return CRYPT_OK if successful |
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32 */ |
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33 int rsa_encrypt_key_ex(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 prng_state *prng, int prng_idx, int hash_idx, int padding, 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 |
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41 LTC_ARGCHK(in != NULL); |
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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 |
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46 /* valid padding? */ |
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47 if ((padding != LTC_PKCS_1_V1_5) && |
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48 (padding != LTC_PKCS_1_OAEP)) { |
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49 return CRYPT_PK_INVALID_PADDING; |
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50 } |
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51 |
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52 /* valid prng? */ |
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53 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { |
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54 return err; |
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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 |
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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 > *outlen) { |
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70 *outlen = modulus_bytelen; |
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71 return CRYPT_BUFFER_OVERFLOW; |
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72 } |
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73 |
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74 if (padding == LTC_PKCS_1_OAEP) { |
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75 /* OAEP pad the key */ |
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76 x = *outlen; |
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77 if ((err = pkcs_1_oaep_encode(in, inlen, lparam, |
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78 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx, |
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79 out, &x)) != CRYPT_OK) { |
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80 return err; |
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81 } |
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82 } else { |
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83 /* PKCS #1 v1.5 pad the key */ |
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84 x = *outlen; |
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85 if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME, |
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86 modulus_bitlen, prng, prng_idx, |
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87 out, &x)) != CRYPT_OK) { |
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88 return err; |
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89 } |
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90 } |
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91 |
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92 /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */ |
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93 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key); |
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94 } |
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95 |
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96 #endif /* LTC_MRSA */ |
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97 |
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98 /* ref: $Format:%D$ */ |
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99 /* git commit: $Format:%H$ */ |
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100 /* commit time: $Format:%ai$ */ |