40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
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/* This file can be used to test whether the code handles non-canonical curve
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* points (i.e. points with the 256th bit set) in the same way as the reference
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* implementation. */
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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extern void curve25519_donna(unsigned char *output, const unsigned char *a,
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const unsigned char *b);
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int
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main()
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{
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static const uint8_t point1[32] = {
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0x25,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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};
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static const uint8_t point2[32] = {
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
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};
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static const uint8_t scalar[32] = { 1 };
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uint8_t out1[32], out2[32];
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curve25519_donna(out1, scalar, point1);
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curve25519_donna(out2, scalar, point2);
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if (0 == memcmp(out1, out2, sizeof(out1))) {
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fprintf(stderr, "Top bit not ignored.\n");
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return 1;
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}
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fprintf(stderr, "Top bit correctly ignored.\n");
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return 0;
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}
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