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@@ -0,0 +1,49 @@
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+
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+#define CRYPTO_PRIVATE
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+
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include "crypto.h"
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+#include "log.h"
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+#include "util.h"
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+#include "compat.h"
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+#include <openssl/bn.h>
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+#include <openssl/rsa.h>
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+
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+int main(int c, char **v)
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+{
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+ crypto_pk_env_t *env;
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+ char *str;
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+ RSA *rsa;
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+ init_logging();
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+
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+ if (c < 2) {
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+ fprintf(stderr, "Hi. I'm tor-checkkey. Tell me a filename that has a PEM-encoded RSA public key (like in a cert) and I'll dump the modulus.\n");
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+ return 1;
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+ }
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+
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+ if (crypto_global_init(0)) {
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+ fprintf(stderr, "Couldn't initialize crypto library.\n");
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+ return 1;
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+ }
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+
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+ str = read_file_to_str(v[1], 0, NULL);
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+ if (!str) {
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+ fprintf(stderr, "Couldn't read %s\n", v[1]);
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+ return 1;
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+ }
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+
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+ env = crypto_new_pk_env();
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+ if (crypto_pk_read_public_key_from_string(env, str, strlen(str))<0) {
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+ fprintf(stderr, "Couldn't parse key.\n");
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+ return 1;
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+ }
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+ tor_free(str);
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+
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+ rsa = _crypto_pk_env_get_rsa(env);
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+ str = BN_bn2hex(rsa->n);
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+
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+ printf("%s\n", str);
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+
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+ return 0;
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+}
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