44 lines
833 B
C
44 lines
833 B
C
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#include "mycrypt.h"
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#ifdef PACKET
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void packet_store_header(unsigned char *dst, int section, int subsection, unsigned long length)
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{
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_ARGCHK(dst != NULL);
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/* store version number */
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dst[0] = CRYPT&255;
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dst[1] = (CRYPT>>8)&255;
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/* store section and subsection */
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dst[2] = section & 255;
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dst[3] = subsection & 255;
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/* store length */
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STORE32L(length, &dst[4]);
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}
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int packet_valid_header(unsigned char *src, int section, int subsection)
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{
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unsigned long ver;
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_ARGCHK(src != NULL);
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/* check version */
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ver = ((unsigned long)src[0]) | ((unsigned long)src[1] << 8);
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if (CRYPT < ver) {
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return CRYPT_INVALID_PACKET;
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}
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/* check section and subsection */
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if (section != src[2] || subsection != src[3]) {
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return CRYPT_INVALID_PACKET;
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}
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return CRYPT_OK;
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}
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#endif
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