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43 lines
1007 B
C
43 lines
1007 B
C
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#include <openssl/bn.h>
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#include <openssl/rand.h>
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static int Rand(n)
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{
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unsigned char x[2];
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RAND_pseudo_bytes(x, 2);
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return (x[0] + 2 * x[1]);
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}
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static void bug(char *m, BIGNUM *a, BIGNUM *b)
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{
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printf("%s!\na=", m);
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BN_print_fp(stdout, a);
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printf("\nb=");
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BN_print_fp(stdout, b);
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printf("\n");
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fflush(stdout);
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}
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main()
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{
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BIGNUM *a = BN_new(), *b = BN_new(), *c = BN_new(), *d = BN_new(),
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*C = BN_new(), *D = BN_new();
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BN_RECP_CTX *recp = BN_RECP_CTX_new();
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BN_CTX *ctx = BN_CTX_new();
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for (;;) {
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BN_pseudo_rand(a, Rand(), 0, 0);
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BN_pseudo_rand(b, Rand(), 0, 0);
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if (BN_is_zero(b))
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continue;
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BN_RECP_CTX_set(recp, b, ctx);
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if (BN_div(C, D, a, b, ctx) != 1)
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bug("BN_div failed", a, b);
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if (BN_div_recp(c, d, a, recp, ctx) != 1)
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bug("BN_div_recp failed", a, b);
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else if (BN_cmp(c, C) != 0 || BN_cmp(c, C) != 0)
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bug("mismatch", a, b);
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}
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}
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