Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_decrypt_key.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +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_decrypt_key.c
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13 RSA PKCS #1 Decryption, 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 decrypt then v1.5 or OAEP depad
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20 @param in The ciphertext
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21 @param inlen The length of the ciphertext (octets)
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22 @param out [out] The plaintext
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23 @param outlen [in/out] The max size and resulting size of the plaintext (octets)
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24 @param lparam The system "lparam" value
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25 @param lparamlen The length of the lparam value (octets)
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26 @param hash_idx The index of the hash desired
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27 @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5)
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28 @param stat [out] Result of the decryption, 1==valid, 0==invalid
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29 @param key The corresponding private RSA key
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30 @return CRYPT_OK if succcessul (even if invalid)
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31 */
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32 int rsa_decrypt_key_ex(const unsigned char *in, unsigned long inlen,
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33 unsigned char *out, unsigned long *outlen,
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34 const unsigned char *lparam, unsigned long lparamlen,
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35 int hash_idx, int padding,
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36 int *stat, 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 unsigned char *tmp;
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41
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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 LTC_ARGCHK(stat != NULL);
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46
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47 /* default to invalid */
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48 *stat = 0;
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49
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50 /* valid padding? */
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51
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52 if ((padding != LTC_PKCS_1_V1_5) &&
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53 (padding != LTC_PKCS_1_OAEP)) {
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54 return CRYPT_PK_INVALID_PADDING;
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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 != inlen) {
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70 return CRYPT_INVALID_PACKET;
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71 }
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72
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73 /* allocate ram */
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74 tmp = XMALLOC(inlen);
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75 if (tmp == NULL) {
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76 return CRYPT_MEM;
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77 }
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78
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79 /* rsa decode the packet */
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80 x = inlen;
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81 if ((err = ltc_mp.rsa_me(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) {
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82 XFREE(tmp);
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83 return err;
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84 }
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85
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 if (padding == LTC_PKCS_1_OAEP) {
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87 /* now OAEP decode the packet */
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88 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx,
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89 out, outlen, stat);
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parents: 285
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90 } else {
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91 /* now PKCS #1 v1.5 depad the packet */
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diff changeset
92 err = pkcs_1_v1_5_decode(tmp, x, LTC_PKCS_1_EME, modulus_bitlen, out, outlen, stat);
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents: 285
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93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
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94
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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95 XFREE(tmp);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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97 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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98
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99 #endif /* LTC_MRSA */
285
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parents:
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100
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101 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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102 /* git commit: $Format:%H$ */
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103 /* commit time: $Format:%ai$ */