Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_encrypt.c @ 1728:01fb08c43b85

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merge
author Matt Johnston <matt@ucc.asn.au>
date Tue, 23 Jun 2020 22:25:57 +0800
parents e9dba7abd939
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 ctr_encrypt.c
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13 CTR implementation, encrypt data, Tom St Denis
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14 */
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16
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17 #ifdef LTC_CTR_MODE
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18
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19 /**
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20 CTR encrypt software implementation
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21 @param pt Plaintext
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22 @param ct [out] Ciphertext
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23 @param len Length of plaintext (octets)
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24 @param ctr CTR state
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25 @return CRYPT_OK if successful
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26 */
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27 static int _ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
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28 {
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29 int x, err;
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30
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31 while (len) {
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32 /* is the pad empty? */
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33 if (ctr->padlen == ctr->blocklen) {
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34 /* increment counter */
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35 if (ctr->mode == CTR_COUNTER_LITTLE_ENDIAN) {
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36 /* little-endian */
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37 for (x = 0; x < ctr->ctrlen; x++) {
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38 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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39 if (ctr->ctr[x] != (unsigned char)0) {
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40 break;
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41 }
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42 }
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43 } else {
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44 /* big-endian */
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45 for (x = ctr->blocklen-1; x >= ctr->ctrlen; x--) {
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46 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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47 if (ctr->ctr[x] != (unsigned char)0) {
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48 break;
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49 }
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50 }
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51 }
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52
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53 /* encrypt it */
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54 if ((err = cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key)) != CRYPT_OK) {
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55 return err;
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56 }
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57 ctr->padlen = 0;
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58 }
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59 #ifdef LTC_FAST
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60 if ((ctr->padlen == 0) && (len >= (unsigned long)ctr->blocklen)) {
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61 for (x = 0; x < ctr->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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62 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x)) ^
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63 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ctr->pad + x));
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64 }
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65 pt += ctr->blocklen;
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66 ct += ctr->blocklen;
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67 len -= ctr->blocklen;
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68 ctr->padlen = ctr->blocklen;
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69 continue;
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70 }
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71 #endif
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72 *ct++ = *pt++ ^ ctr->pad[ctr->padlen++];
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73 --len;
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74 }
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75 return CRYPT_OK;
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76 }
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77
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78 /**
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79 CTR encrypt
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80 @param pt Plaintext
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81 @param ct [out] Ciphertext
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82 @param len Length of plaintext (octets)
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83 @param ctr CTR state
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84 @return CRYPT_OK if successful
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85 */
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86 int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
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87 {
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88 int err, fr;
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89
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90 LTC_ARGCHK(pt != NULL);
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91 LTC_ARGCHK(ct != NULL);
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92 LTC_ARGCHK(ctr != NULL);
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93
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94 if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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95 return err;
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96 }
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97
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98 /* is blocklen/padlen valid? */
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99 if ((ctr->blocklen < 1) || (ctr->blocklen > (int)sizeof(ctr->ctr)) ||
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100 (ctr->padlen < 0) || (ctr->padlen > (int)sizeof(ctr->pad))) {
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101 return CRYPT_INVALID_ARG;
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102 }
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103
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104 #ifdef LTC_FAST
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105 if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) {
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106 return CRYPT_INVALID_ARG;
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107 }
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108 #endif
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109
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110 /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */
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111 if ((cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL) && (len >= (unsigned long)ctr->blocklen)) {
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112 if (ctr->padlen < ctr->blocklen) {
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113 fr = ctr->blocklen - ctr->padlen;
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114 if ((err = _ctr_encrypt(pt, ct, fr, ctr)) != CRYPT_OK) {
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115 return err;
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116 }
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117 pt += fr;
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118 ct += fr;
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119 len -= fr;
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120 }
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121
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122 if (len >= (unsigned long)ctr->blocklen) {
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123 if ((err = cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key)) != CRYPT_OK) {
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124 return err;
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125 }
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126 pt += (len / ctr->blocklen) * ctr->blocklen;
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127 ct += (len / ctr->blocklen) * ctr->blocklen;
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128 len %= ctr->blocklen;
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129 }
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130 }
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131
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132 return _ctr_encrypt(pt, ct, len, ctr);
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133 }
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134
285
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135 #endif
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136
1471
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137 /* ref: $Format:%D$ */
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138 /* git commit: $Format:%H$ */
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139 /* commit time: $Format:%ai$ */