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annotate libtomcrypt/src/encauth/ocb3/ocb3_encrypt_last.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
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 /**
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11 @file ocb3_encrypt_last.c
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12 OCB implementation, internal helper, by Karel Miko
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_OCB3_MODE
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17
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18 /**
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19 Finish an OCB (encryption) stream
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20 @param ocb The OCB state
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21 @param pt The remaining plaintext
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22 @param ptlen The length of the plaintext (octets)
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23 @param ct [out] The output buffer
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24 @return CRYPT_OK if successful
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25 */
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26 int ocb3_encrypt_last(ocb3_state *ocb, const unsigned char *pt, unsigned long ptlen, unsigned char *ct)
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27 {
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28 unsigned char iOffset_star[MAXBLOCKSIZE];
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29 unsigned char iPad[MAXBLOCKSIZE];
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30 int err, x, full_blocks, full_blocks_len, last_block_len;
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31
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32 LTC_ARGCHK(ocb != NULL);
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33 if (pt == NULL) LTC_ARGCHK(ptlen == 0);
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34 if (ptlen != 0) {
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35 LTC_ARGCHK(pt != NULL);
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36 LTC_ARGCHK(ct != NULL);
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37 }
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38
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39 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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40 goto LBL_ERR;
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41 }
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42
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43 full_blocks = ptlen/ocb->block_len;
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44 full_blocks_len = full_blocks * ocb->block_len;
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45 last_block_len = ptlen - full_blocks_len;
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46
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47 /* process full blocks first */
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48 if (full_blocks>0) {
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49 if ((err = ocb3_encrypt(ocb, pt, full_blocks_len, ct)) != CRYPT_OK) {
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50 goto LBL_ERR;
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51 }
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52 }
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53
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54 /* at this point: m = ocb->block_index (last block index), Offset_m = ocb->Offset_current */
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55
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56 if (last_block_len>0) {
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57 /* Offset_* = Offset_m xor L_* */
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58 ocb3_int_xor_blocks(iOffset_star, ocb->Offset_current, ocb->L_star, ocb->block_len);
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59
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60 /* Pad = ENCIPHER(K, Offset_*) */
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61 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(iOffset_star, iPad, &ocb->key)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64
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65 /* C_* = P_* xor Pad[1..bitlen(P_*)] */
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66 ocb3_int_xor_blocks(ct+full_blocks_len, pt+full_blocks_len, iPad, last_block_len);
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67
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68 /* Checksum_* = Checksum_m xor (P_* || 1 || zeros(127-bitlen(P_*))) */
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69 ocb3_int_xor_blocks(ocb->checksum, ocb->checksum, pt+full_blocks_len, last_block_len);
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70 for(x=last_block_len; x<ocb->block_len; x++) {
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71 if (x == last_block_len)
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72 ocb->checksum[x] ^= 0x80;
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73 else
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74 ocb->checksum[x] ^= 0x00;
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75 }
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76
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77 /* Tag = ENCIPHER(K, Checksum_* xor Offset_* xor L_$) xor HASH(K,A) */
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78 /* at this point we calculate only: Tag_part = ENCIPHER(K, Checksum_* xor Offset_* xor L_$) */
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79 for(x=0; x<ocb->block_len; x++) {
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80 ocb->tag_part[x] = (ocb->checksum[x] ^ iOffset_star[x]) ^ ocb->L_dollar[x];
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81 }
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82 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->tag_part, ocb->tag_part, &ocb->key)) != CRYPT_OK) {
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83 goto LBL_ERR;
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84 }
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85 }
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86 else {
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87 /* Tag = ENCIPHER(K, Checksum_m xor Offset_m xor L_$) xor HASH(K,A) */
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88 /* at this point we calculate only: Tag_part = ENCIPHER(K, Checksum_m xor Offset_m xor L_$) */
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89 for(x=0; x<ocb->block_len; x++) {
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90 ocb->tag_part[x] = (ocb->checksum[x] ^ ocb->Offset_current[x]) ^ ocb->L_dollar[x];
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91 }
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92 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->tag_part, ocb->tag_part, &ocb->key)) != CRYPT_OK) {
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93 goto LBL_ERR;
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94 }
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95 }
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96
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97 err = CRYPT_OK;
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98
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99 LBL_ERR:
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100 #ifdef LTC_CLEAN_STACK
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101 zeromem(iOffset_star, MAXBLOCKSIZE);
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102 zeromem(iPad, MAXBLOCKSIZE);
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103 #endif
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104
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105 return err;
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106 }
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107
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108 #endif
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109
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110 /* ref: $Format:%D$ */
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111 /* git commit: $Format:%H$ */
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112 /* commit time: $Format:%ai$ */