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annotate libtomcrypt/src/stream/rc4/rc4_stream.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
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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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_RC4_STREAM
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13
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14 /**
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15 Initialize an RC4 context (only the key)
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16 @param st [out] The destination of the RC4 state
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17 @param key The secret key
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18 @param keylen The length of the secret key (8 - 256 bytes)
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19 @return CRYPT_OK if successful
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20 */
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21 int rc4_stream_setup(rc4_state *st, const unsigned char *key, unsigned long keylen)
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22 {
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23 unsigned char tmp, *s;
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24 int x, y;
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25 unsigned long j;
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26
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27 LTC_ARGCHK(st != NULL);
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28 LTC_ARGCHK(key != NULL);
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29 LTC_ARGCHK(keylen >= 5); /* 40-2048 bits */
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30
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31 s = st->buf;
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32 for (x = 0; x < 256; x++) {
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33 s[x] = x;
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34 }
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35
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36 for (j = x = y = 0; x < 256; x++) {
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37 y = (y + s[x] + key[j++]) & 255;
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38 if (j == keylen) {
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39 j = 0;
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40 }
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41 tmp = s[x]; s[x] = s[y]; s[y] = tmp;
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42 }
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43 st->x = 0;
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44 st->y = 0;
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45
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46 return CRYPT_OK;
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47 }
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48
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49 /**
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50 Encrypt (or decrypt) bytes of ciphertext (or plaintext) with RC4
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51 @param st The RC4 state
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52 @param in The plaintext (or ciphertext)
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53 @param inlen The length of the input (octets)
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54 @param out [out] The ciphertext (or plaintext), length inlen
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55 @return CRYPT_OK if successful
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56 */
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57 int rc4_stream_crypt(rc4_state *st, const unsigned char *in, unsigned long inlen, unsigned char *out)
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58 {
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59 unsigned char x, y, *s, tmp;
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60
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61 LTC_ARGCHK(st != NULL);
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62 LTC_ARGCHK(in != NULL);
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63 LTC_ARGCHK(out != NULL);
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64
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65 x = st->x;
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66 y = st->y;
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67 s = st->buf;
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68 while (inlen--) {
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69 x = (x + 1) & 255;
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70 y = (y + s[x]) & 255;
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71 tmp = s[x]; s[x] = s[y]; s[y] = tmp;
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72 tmp = (s[x] + s[y]) & 255;
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73 *out++ = *in++ ^ s[tmp];
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74 }
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75 st->x = x;
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76 st->y = y;
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77 return CRYPT_OK;
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78 }
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79
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80 /**
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81 Generate a stream of random bytes via RC4
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82 @param st The RC420 state
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83 @param out [out] The output buffer
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84 @param outlen The output length
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85 @return CRYPT_OK on success
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86 */
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87 int rc4_stream_keystream(rc4_state *st, unsigned char *out, unsigned long outlen)
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88 {
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89 if (outlen == 0) return CRYPT_OK; /* nothing to do */
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90 LTC_ARGCHK(out != NULL);
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91 XMEMSET(out, 0, outlen);
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92 return rc4_stream_crypt(st, out, outlen, out);
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93 }
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94
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95 /**
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96 Terminate and clear RC4 state
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97 @param st The RC4 state
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98 @return CRYPT_OK on success
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99 */
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100 int rc4_stream_done(rc4_state *st)
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101 {
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102 LTC_ARGCHK(st != NULL);
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103 XMEMSET(st, 0, sizeof(rc4_state));
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104 return CRYPT_OK;
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105 }
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106
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107 #endif
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108
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109 /* ref: $Format:%D$ */
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110 /* git commit: $Format:%H$ */
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111 /* commit time: $Format:%ai$ */