Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_exptmod.c @ 1759:4c5599435084

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merge from main
author Matt Johnston <matt@ucc.asn.au>
date Sun, 25 Oct 2020 21:47:42 +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_exptmod.c
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13 RSA PKCS exptmod, Tom St Denis
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14 Added RSA blinding --nmav
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15 */
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16
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17 #ifdef LTC_MRSA
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18
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19 /**
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20 Compute an RSA modular exponentiation
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21 @param in The input data to send into RSA
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22 @param inlen The length of the input (octets)
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23 @param out [out] The destination
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24 @param outlen [in/out] The max size and resulting size of the output
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25 @param which Which exponent to use, e.g. PK_PRIVATE or PK_PUBLIC
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26 @param key The RSA key to use
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27 @return CRYPT_OK if successful
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28 */
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29 int rsa_exptmod(const unsigned char *in, unsigned long inlen,
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30 unsigned char *out, unsigned long *outlen, int which,
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31 rsa_key *key)
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32 {
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33 void *tmp, *tmpa, *tmpb;
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34 #ifdef LTC_RSA_BLINDING
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35 void *rnd, *rndi /* inverse of rnd */;
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36 #endif
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37 unsigned long x;
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38 int err, has_crt_parameters;
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40 LTC_ARGCHK(in != NULL);
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41 LTC_ARGCHK(out != NULL);
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42 LTC_ARGCHK(outlen != NULL);
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43 LTC_ARGCHK(key != NULL);
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45 /* is the key of the right type for the operation? */
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46 if (which == PK_PRIVATE && (key->type != PK_PRIVATE)) {
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47 return CRYPT_PK_NOT_PRIVATE;
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48 }
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50 /* must be a private or public operation */
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51 if (which != PK_PRIVATE && which != PK_PUBLIC) {
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52 return CRYPT_PK_INVALID_TYPE;
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53 }
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55 /* init and copy into tmp */
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56 if ((err = mp_init_multi(&tmp, &tmpa, &tmpb,
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57 #ifdef LTC_RSA_BLINDING
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58 &rnd, &rndi,
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59 #endif /* LTC_RSA_BLINDING */
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60 NULL)) != CRYPT_OK)
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61 { return err; }
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62 if ((err = mp_read_unsigned_bin(tmp, (unsigned char *)in, (int)inlen)) != CRYPT_OK)
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63 { goto error; }
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66 /* sanity check on the input */
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67 if (mp_cmp(key->N, tmp) == LTC_MP_LT) {
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68 err = CRYPT_PK_INVALID_SIZE;
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