int GetDocumentHash(char *fileName, KSI_Signature *sig, KSI_DataHash **hsh) { int res = KSI_UNKNOWN_ERROR; KSI_DataHash *tmp = NULL; KSI_DataHasher *hsr = NULL; FILE *in = NULL; unsigned char buf[1024]; size_t buf_len; if (fileName == NULL || sig == NULL || hsh == NULL) { res = KSI_INVALID_ARGUMENT; goto cleanup; } /* Create hasher. */ res = KSI_Signature_createDataHasher(sig, &hsr); if (res != KSI_OK) { fprintf(stderr, "Unable to create data hasher.\n"); goto cleanup; } /* Open the document for reading. */ in = fopen(fileName, "rb"); if (in == NULL) { fprintf(stderr, "Unable to open data file '%s'.\n", fileName); goto cleanup; } /* Calculate the hash of the document. */ while (!feof(in)) { buf_len = fread(buf, 1, sizeof(buf), in); res = KSI_DataHasher_add(hsr, buf, buf_len); if (res != KSI_OK) { fprintf(stderr, "Unable hash the document.\n"); goto cleanup; } } /* Finalize the hash computation. */ res = KSI_DataHasher_close(hsr, &tmp); if (res != KSI_OK) { fprintf(stderr, "Failed to close the hashing process.\n"); goto cleanup; } *hsh = tmp; tmp = NULL; res = KSI_OK; cleanup: KSI_DataHasher_free(hsr); KSI_DataHash_free(tmp); if (in != NULL) fclose(in); return res; }
int main(int argc, char **argv) { int res = KSI_UNKNOWN_ERROR; /* Signature read from the file. */ KSI_Signature *sig = NULL; /* Signature extended to the publication. */ KSI_Signature *ext = NULL; /* Hash of the data file. */ KSI_DataHash *hsh = NULL; /* Hash value extracted from the signature. */ KSI_DataHash *signHsh = NULL; /* Data file hasher. */ KSI_DataHasher *hsr = NULL; /* Input file descriptor. */ FILE *in = NULL; /* Buffer for reading the input. */ unsigned char buf[1024]; /* Length of the buffer content. */ size_t buf_len; /* Verification info object. */ const KSI_VerificationResult *info = NULL; /* File descriptor for logging. */ FILE *logFile = NULL; const KSI_CertConstraint pubFileCertConstr[] = { { KSI_CERT_EMAIL, "*****@*****.**"}, { NULL, NULL } }; /* Init context. */ res = KSI_CTX_new(&ksi); if (res != KSI_OK) { fprintf(stderr, "Unable to init KSI context.\n"); goto cleanup; } logFile = fopen("ksi_verify.log", "w"); if (logFile == NULL) { fprintf(stderr, "Unable to open log file.\n"); } res = KSI_CTX_setDefaultPubFileCertConstraints(ksi, pubFileCertConstr); if (res != KSI_OK) { fprintf(stderr, "Unable to configure publications file cert constraints.\n"); goto cleanup; } /* Configure the logger. */ KSI_CTX_setLoggerCallback(ksi, KSI_LOG_StreamLogger, logFile); KSI_CTX_setLogLevel(ksi, KSI_LOG_DEBUG); KSI_LOG_info(ksi, "Using KSI version: '%s'", KSI_getVersion()); /* Check parameters. */ if (argc != 6) { fprintf(stderr, "Usage\n" " %s <data file | -> <signature> <publication-str> <extender url> <pub-file url>\n", argv[0]); goto cleanup; } /* Configure extender. */ res = KSI_CTX_setExtender(ksi, argv[4], "anon", "anon"); if (res != KSI_OK) { fprintf(stderr, "Unable to set extender parameters.\n"); goto cleanup; } /* Set the publications file url. */ res = KSI_CTX_setPublicationUrl(ksi, argv[4]); if (res != KSI_OK) { fprintf(stderr, "Unable to set publications file url.\n"); goto cleanup; } printf("Reading signature... "); /* Read the signature. */ res = KSI_Signature_fromFile(ksi, argv[2], &sig); if (res != KSI_OK) { printf("failed (%s)\n", KSI_getErrorString(res)); goto cleanup; } printf("ok\n"); printf("Verifying the signature with the publication... "); res = extendToPublication(sig, argv[3], &ext); switch (res) { case KSI_OK: printf("ok\n"); break; case KSI_VERIFICATION_FAILURE: printf("failed\n"); break; default: printf("failed (%s)\n", KSI_getErrorString(res)); goto cleanup; } /* Create hasher. */ res = KSI_Signature_createDataHasher(ext, &hsr); if (res != KSI_OK) { fprintf(stderr, "Unable to create data hasher.\n"); goto cleanup; } if (strcmp(argv[1], "-")) { in = fopen(argv[1], "rb"); if (in == NULL) { fprintf(stderr, "Unable to open data file '%s'.\n", argv[1]); goto cleanup; } /* Calculate the hash of the document. */ while (!feof(in)) { buf_len = fread(buf, 1, sizeof(buf), in); res = KSI_DataHasher_add(hsr, buf, buf_len); if (res != KSI_OK) { fprintf(stderr, "Unable hash the document.\n"); goto cleanup; } } /* Finalize the hash computation. */ res = KSI_DataHasher_close(hsr, &hsh); if (res != KSI_OK) { fprintf(stderr, "Failed to close the hashing process.\n"); goto cleanup; } res = KSI_Signature_getDocumentHash(sig, &signHsh); if (res != KSI_OK) goto cleanup; printf("Verifying document hash... "); if (!KSI_DataHash_equals(hsh, signHsh)) { printf("Wrong document!\n"); goto cleanup; } printf("ok\n"); } res = KSI_Signature_getVerificationResult(ext, &info); if (res != KSI_OK) goto cleanup; if (info != NULL) { size_t i; printf("Verification info:\n"); for (i = 0; i < KSI_VerificationResult_getStepResultCount(info); i++) { const KSI_VerificationStepResult *result = NULL; const char *desc = NULL; res = KSI_VerificationResult_getStepResult(info, i, &result); if (res != KSI_OK) goto cleanup; printf("\t0x%02x:\t%s", KSI_VerificationStepResult_getStep(result), KSI_VerificationStepResult_isSuccess(result) ? "OK" : "FAIL"); desc = KSI_VerificationStepResult_getDescription(result); if (desc && *desc) { printf(" (%s)", desc); } printf("\n"); } } res = KSI_OK; cleanup: if (logFile != NULL) fclose(logFile); if (res != KSI_OK && ksi != NULL) { KSI_ERR_statusDump(ksi, stderr); } if (in != NULL) fclose(in); KSI_Signature_free(sig); KSI_Signature_free(ext); KSI_DataHasher_free(hsr); KSI_DataHash_free(hsh); KSI_CTX_free(ksi); return res; }