Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 1813:b63f1e803f70

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Update config.sub and config.guess to latest
author Matt Johnston <matt@ucc.asn.au>
date Wed, 31 Mar 2021 23:21:30 +0800
parents 6dba84798cd5
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 #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
285
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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
285
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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;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
89 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
90 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
91
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
92 /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
96 #endif /* LTC_MRSA */
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
100 /* commit time: $Format:%ai$ */