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42 lines
873 B
C
42 lines
873 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)) 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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