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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_memory.c @ 1889:fc4c9ef61856

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Split CPPFLAGS and CFLAGS more carefully This has no change to the build, but makes it easier to try other build tools that only want CPPFLAGS
author Matt Johnston <matt@ucc.asn.au>
date Tue, 22 Mar 2022 16:17:05 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Process an entire GCM packet in one call.
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16 @param key The secret key
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17 @param keylen The length of the secret key
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18 @param iv The initialization vector
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19 @param ivlen The length of the initialization vector
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20 @param aad The additional authentication data (header)
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21 @param aadlen The length of the aad
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22 @param in The plaintext
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23 @param inlen The length of the plaintext (ciphertext length is the same)
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24 @param out The ciphertext
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25 @param tag [out] The MAC tag
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26 @param taglen [in/out] The MAC tag length
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27 @param direction Encrypt or Decrypt mode (CHACHA20POLY1305_ENCRYPT or CHACHA20POLY1305_DECRYPT)
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28 @return CRYPT_OK on success
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29 */
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30 int chacha20poly1305_memory(const unsigned char *key, unsigned long keylen,
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31 const unsigned char *iv, unsigned long ivlen,
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32 const unsigned char *aad, unsigned long aadlen,
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33 const unsigned char *in, unsigned long inlen,
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34 unsigned char *out,
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35 unsigned char *tag, unsigned long *taglen,
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36 int direction)
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37 {
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38 chacha20poly1305_state st;
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39 int err;
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40
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41 LTC_ARGCHK(key != NULL);
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42 LTC_ARGCHK(iv != NULL);
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43 LTC_ARGCHK(in != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(tag != NULL);
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46
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47 if ((err = chacha20poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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48 if ((err = chacha20poly1305_setiv(&st, iv, ivlen)) != CRYPT_OK) { goto LBL_ERR; }
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49 if (aad && aadlen > 0) {
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50 if ((err = chacha20poly1305_add_aad(&st, aad, aadlen)) != CRYPT_OK) { goto LBL_ERR; }
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51 }
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52 if (direction == CHACHA20POLY1305_ENCRYPT) {
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53 if ((err = chacha20poly1305_encrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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54 }
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55 else if (direction == CHACHA20POLY1305_DECRYPT) {
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56 if ((err = chacha20poly1305_decrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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57 }
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58 else {
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59 err = CRYPT_INVALID_ARG;
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60 goto LBL_ERR;
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61 }
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62 err = chacha20poly1305_done(&st, tag, taglen);
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63 LBL_ERR:
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(&st, sizeof(chacha20poly1305_state));
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66 #endif
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67 return err;
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68 }
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69
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70 #endif
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71
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72 /* ref: $Format:%D$ */
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73 /* git commit: $Format:%H$ */
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74 /* commit time: $Format:%ai$ */