Mercurial > dropbear
view libtomcrypt/src/misc/adler32.c @ 1665:7c17995bcdfb
Improve address logging on early exit messages (#83)
Change 'Early exit' and 'Exit before auth' messages to include the IP
address & port as part of the message.
This allows log scanning utilities such as 'fail2ban' to obtain the
offending IP address as part of the failure event instead of extracting
the PID from the message and then scanning the log again for match
'child connection from' messages
Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author | Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com> |
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date | Wed, 18 Mar 2020 15:28:56 +0000 |
parents | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ #include "tomcrypt.h" /** @file adler32.c Adler-32 checksum algorithm Written and placed in the public domain by Wei Dai Adapted for libtomcrypt by Steffen Jaeckel */ #ifdef LTC_ADLER32 static const unsigned long _adler32_base = 65521; void adler32_init(adler32_state *ctx) { LTC_ARGCHKVD(ctx != NULL); ctx->s[0] = 1; ctx->s[1] = 0; } void adler32_update(adler32_state *ctx, const unsigned char *input, unsigned long length) { unsigned long s1, s2; LTC_ARGCHKVD(ctx != NULL); LTC_ARGCHKVD(input != NULL); s1 = ctx->s[0]; s2 = ctx->s[1]; if (length % 8 != 0) { do { s1 += *input++; s2 += s1; length--; } while (length % 8 != 0); if (s1 >= _adler32_base) s1 -= _adler32_base; s2 %= _adler32_base; } while (length > 0) { s1 += input[0]; s2 += s1; s1 += input[1]; s2 += s1; s1 += input[2]; s2 += s1; s1 += input[3]; s2 += s1; s1 += input[4]; s2 += s1; s1 += input[5]; s2 += s1; s1 += input[6]; s2 += s1; s1 += input[7]; s2 += s1; length -= 8; input += 8; if (s1 >= _adler32_base) s1 -= _adler32_base; s2 %= _adler32_base; } LTC_ARGCHKVD(s1 < _adler32_base); LTC_ARGCHKVD(s2 < _adler32_base); ctx->s[0] = (unsigned short)s1; ctx->s[1] = (unsigned short)s2; } void adler32_finish(adler32_state *ctx, void *hash, unsigned long size) { unsigned char* h; LTC_ARGCHKVD(ctx != NULL); LTC_ARGCHKVD(hash != NULL); h = hash; switch (size) { default: h[3] = ctx->s[0] & 0x0ff; /* FALLTHROUGH */ case 3: h[2] = (ctx->s[0] >> 8) & 0x0ff; /* FALLTHROUGH */ case 2: h[1] = ctx->s[1] & 0x0ff; /* FALLTHROUGH */ case 1: h[0] = (ctx->s[1] >> 8) & 0x0ff; /* FALLTHROUGH */ case 0: ; } } int adler32_test(void) { #ifndef LTC_TEST return CRYPT_NOP; #else const void* in = "libtomcrypt"; const unsigned char adler32[] = { 0x1b, 0xe8, 0x04, 0xba }; unsigned char out[4]; adler32_state ctx; adler32_init(&ctx); adler32_update(&ctx, in, strlen(in)); adler32_finish(&ctx, out, 4); if (compare_testvector(adler32, 4, out, 4, "adler32", 0)) { return CRYPT_FAIL_TESTVECTOR; } return CRYPT_OK; #endif } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */