зеркало из https://github.com/github/putty.git
44 строки
1.1 KiB
C
44 строки
1.1 KiB
C
/*
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* Centralised parts of the SSH-2 MAC API, which don't need to vary
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* with the MAC implementation.
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*/
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#include <assert.h>
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#include "ssh.h"
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bool ssh2_mac_verresult(ssh2_mac *mac, const void *candidate)
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{
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unsigned char correct[64]; /* at least as big as all known MACs */
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bool toret;
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assert(mac->vt->len <= sizeof(correct));
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ssh2_mac_genresult(mac, correct);
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toret = smemeq(correct, candidate, mac->vt->len);
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smemclr(correct, sizeof(correct));
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return toret;
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}
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static void ssh2_mac_prepare(ssh2_mac *mac, const void *blk, int len,
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unsigned long seq)
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{
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ssh2_mac_start(mac);
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put_uint32(mac, seq);
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put_data(mac, blk, len);
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}
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void ssh2_mac_generate(ssh2_mac *mac, void *blk, int len, unsigned long seq)
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{
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ssh2_mac_prepare(mac, blk, len, seq);
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ssh2_mac_genresult(mac, (unsigned char *)blk + len);
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}
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bool ssh2_mac_verify(
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ssh2_mac *mac, const void *blk, int len, unsigned long seq)
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{
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ssh2_mac_prepare(mac, blk, len, seq);
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return ssh2_mac_verresult(mac, (const unsigned char *)blk + len);
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}
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