Mercurial > dropbear

annotate src/pk/rsa/rsa_v15_decrypt_key.c @ 196:704bb050935f libtomcrypt

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makefile fixup for Dropbear
author Matt Johnston <matt@ucc.asn.au>
date Mon, 09 May 2005 12:00:08 +0000
parents 1c15b283127b
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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file rsa_v15_decrypt_key.c
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15 RSA PKCS v1.5 Decryption, Tom St Denis
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16 */
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17
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18 #ifdef MRSA
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19
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20 /**
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21 RSA decrypt then PKCS #1 v1.5 depad
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22 @param in The ciphertext
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23 @param inlen The length of the ciphertext (octets)
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24 @param out [out] The plaintext
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25 @param outlen The length of the plaintext (you have to tell this function as it's not part of PKCS #1 v1.0 padding!)
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26 @param stat [out] Status of decryption, 1==valid, 0==invalid
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27 @param key The corresponding private RSA key
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28 @return CRYPT_OK if successful (even if invalid)
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29 */
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30 int rsa_v15_decrypt_key(const unsigned char *in, unsigned long inlen,
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31 unsigned char *out, unsigned long outlen,
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32 int *stat, rsa_key *key)
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33 {
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34 unsigned long modulus_bitlen, modulus_bytelen, x;
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35 int err;
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36 unsigned char *tmp;
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37
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38 LTC_ARGCHK(out != NULL);
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39 LTC_ARGCHK(key != NULL);
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40 LTC_ARGCHK(stat != NULL);
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41
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42 /* default to invalid */
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43 *stat = 0;
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44
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45 /* get modulus len in bits */
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46 modulus_bitlen = mp_count_bits(&(key->N));
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47
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48 /* outlen must be at least the size of the modulus */
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49 modulus_bytelen = mp_unsigned_bin_size(&(key->N));
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50 if (modulus_bytelen != inlen) {
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51 return CRYPT_INVALID_PACKET;
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52 }
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53
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54 /* allocate ram */
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55 tmp = XMALLOC(inlen);
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56 if (tmp == NULL) {
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57 return CRYPT_MEM;
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58 }
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59
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60 /* rsa decode the packet */
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61 x = inlen;
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62 if ((err = rsa_exptmod(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) {
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63 XFREE(tmp);
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64 return err;
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65 }
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66
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67 /* PKCS #1 v1.5 depad */
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68 err = pkcs_1_v15_es_decode(tmp, x, modulus_bitlen, out, outlen, stat);
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69 XFREE(tmp);
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70 return err;
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71 }
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72
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73 #endif