105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
#include "common.h"
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "mbedtls/ctr_drbg.h"
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#if defined(MBEDTLS_PLATFORM_TIME_ALT)
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mbedtls_time_t dummy_constant_time(mbedtls_time_t *time)
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{
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(void) time;
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return 0x5af2a056;
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}
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#endif
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void dummy_init()
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{
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#if defined(MBEDTLS_PLATFORM_TIME_ALT)
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mbedtls_platform_set_time(dummy_constant_time);
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#else
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fprintf(stderr, "Warning: fuzzing without constant time\n");
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#endif
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}
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int dummy_send(void *ctx, const unsigned char *buf, size_t len)
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{
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//silence warning about unused parameter
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(void) ctx;
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(void) buf;
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//pretends we wrote everything ok
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if (len > INT_MAX) {
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return -1;
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}
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return (int) len;
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}
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int fuzz_recv(void *ctx, unsigned char *buf, size_t len)
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{
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//reads from the buffer from fuzzer
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fuzzBufferOffset_t *biomemfuzz = (fuzzBufferOffset_t *) ctx;
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if (biomemfuzz->Offset == biomemfuzz->Size) {
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//EOF
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return 0;
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}
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if (len > INT_MAX) {
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return -1;
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}
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if (len + biomemfuzz->Offset > biomemfuzz->Size) {
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//do not overflow
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len = biomemfuzz->Size - biomemfuzz->Offset;
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}
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memcpy(buf, biomemfuzz->Data + biomemfuzz->Offset, len);
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biomemfuzz->Offset += len;
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return (int) len;
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}
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int dummy_random(void *p_rng, unsigned char *output, size_t output_len)
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{
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int ret;
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size_t i;
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#if defined(MBEDTLS_CTR_DRBG_C)
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//mbedtls_ctr_drbg_random requires a valid mbedtls_ctr_drbg_context in p_rng
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if (p_rng != NULL) {
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//use mbedtls_ctr_drbg_random to find bugs in it
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ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
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} else {
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//fall through to pseudo-random
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ret = 0;
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}
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#else
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(void) p_rng;
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ret = 0;
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#endif
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for (i = 0; i < output_len; i++) {
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//replace result with pseudo random
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output[i] = (unsigned char) rand();
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}
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return ret;
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}
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int dummy_entropy(void *data, unsigned char *output, size_t len)
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{
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size_t i;
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(void) data;
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//use mbedtls_entropy_func to find bugs in it
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//test performance impact of entropy
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//ret = mbedtls_entropy_func(data, output, len);
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for (i = 0; i < len; i++) {
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//replace result with pseudo random
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output[i] = (unsigned char) rand();
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}
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return 0;
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}
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int fuzz_recv_timeout(void *ctx, unsigned char *buf, size_t len,
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uint32_t timeout)
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{
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(void) timeout;
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return fuzz_recv(ctx, buf, len);
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}
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