Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_decrypt_verify_memory.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
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
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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10 /**
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11 @file ocb_decrypt_verify_memory.c
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12 OCB implementation, helper to decrypt block of memory, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_OCB_MODE
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18 /**
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19 Decrypt and compare the tag with OCB.
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce (length of the block size of the block cipher)
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24 @param ct The ciphertext
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25 @param ctlen The length of the ciphertext (octets)
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26 @param pt [out] The plaintext
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27 @param tag The tag to compare against
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28 @param taglen The length of the tag (octets)
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29 @param stat [out] The result of the tag comparison (1==valid, 0==invalid)
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30 @return CRYPT_OK if successful regardless of the tag comparison
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31 */
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32 int ocb_decrypt_verify_memory(int cipher,
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33 const unsigned char *key, unsigned long keylen,
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34 const unsigned char *nonce,
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35 const unsigned char *ct, unsigned long ctlen,
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36 unsigned char *pt,
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37 const unsigned char *tag, unsigned long taglen,
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38 int *stat)
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39 {
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40 int err;
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41 ocb_state *ocb;
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(nonce != NULL);
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45 LTC_ARGCHK(pt != NULL);
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46 LTC_ARGCHK(ct != NULL);
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47 LTC_ARGCHK(tag != NULL);
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48 LTC_ARGCHK(stat != NULL);
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49
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50 /* allocate memory */
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51 ocb = XMALLOC(sizeof(ocb_state));
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52 if (ocb == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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57 goto LBL_ERR;
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58 }
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59
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60 while (ctlen > (unsigned long)ocb->block_len) {
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61 if ((err = ocb_decrypt(ocb, ct, pt)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 ctlen -= ocb->block_len;
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65 pt += ocb->block_len;
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66 ct += ocb->block_len;
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67 }
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68
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69 err = ocb_done_decrypt(ocb, ct, ctlen, pt, tag, taglen, stat);
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70 LBL_ERR:
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(ocb, sizeof(ocb_state));
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73 #endif
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74
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75 XFREE(ocb);
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76
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77 return err;
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78 }
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79
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80 #endif
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81
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 /* commit time: $Format:%ai$ */