Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_decode.c @ 1938:77bc00dcc19f default tip main master

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Bump version to 2022.82
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 14:43:27 +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 pkcs_1_oaep_decode.c
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13 OAEP Padding for PKCS #1, Tom St Denis
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14 */
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16 #ifdef LTC_PKCS_1
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18 /**
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19 PKCS #1 v2.00 OAEP decode
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20 @param msg The encoded data to decode
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21 @param msglen The length of the encoded data (octets)
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22 @param lparam The session or system data (can be NULL)
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23 @param lparamlen The length of the lparam
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24 @param modulus_bitlen The bit length of the RSA modulus
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25 @param hash_idx The index of the hash desired
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26 @param out [out] Destination of decoding
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27 @param outlen [in/out] The max size and resulting size of the decoding
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28 @param res [out] Result of decoding, 1==valid, 0==invalid
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29 @return CRYPT_OK if successful
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30 */
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31 int pkcs_1_oaep_decode(const unsigned char *msg, unsigned long msglen,
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32 const unsigned char *lparam, unsigned long lparamlen,
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33 unsigned long modulus_bitlen, int hash_idx,
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34 unsigned char *out, unsigned long *outlen,
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35 int *res)
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36 {
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37 unsigned char *DB, *seed, *mask;
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38 unsigned long hLen, x, y, modulus_len;
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39 int err, ret;
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41 LTC_ARGCHK(msg != 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(res != NULL);
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46 /* default to invalid packet */
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47 *res = 0;
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48
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49 /* test valid hash */
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50 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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51 return err;
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52 }
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53 hLen = hash_descriptor[hash_idx].hashsize;
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54 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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56 /* test hash/message size */
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57 if ((2*hLen >= (modulus_len - 2)) || (msglen != modulus_len)) {
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58 return CRYPT_PK_INVALID_SIZE;
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59 }
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61 /* allocate ram for DB/mask/salt of size modulus_len */
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62 DB = XMALLOC(modulus_len);
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63 mask = XMALLOC(modulus_len);
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64 seed = XMALLOC(hLen);
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65 if (DB == NULL || mask == NULL || seed == NULL) {
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66 if (DB != NULL) {
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67 XFREE(DB);
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