list-ciphers.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/err.h>
#include <openssl/ssl.h>

int main(int argc, char *argv[])
{
	const SSL_METHOD *method = TLSv1_client_method();
	SSL_CTX	   *ctx;
	SSL	   *ssl = NULL;
	char	   *ciphers;
	int	    i;
       
	if (argc < 2)
	{
		fprintf(stderr, "ciphers not specified\n");
		exit(1);
	}

	ciphers = argv[1];

	SSL_library_init();

	ctx = SSL_CTX_new(method);
	if (!ctx)
	{
		fprintf(stderr, "something went wrong\n");
		exit(1);
	}

	if (!SSL_CTX_set_cipher_list(ctx, ciphers))
	{
		fprintf(stderr, "unable to set cipher list\n");
		exit(1);
	}

	ssl = SSL_new(ctx);
	if (!ssl)
	{
		fprintf(stderr, "unable to create the SSL object\n");
		exit(1);
	}

	for (i = 0;; i++)
	{
		const char   *cipher;

		cipher = SSL_get_cipher_list(ssl, i);
		if (cipher == NULL)
		{
			fprintf(stderr, "end of cipher list?\n");
			break;
		}
		printf("cipher: %s\n", cipher);
	}

	SSL_CTX_free(ctx);
	SSL_free(ssl);

	return 0;
}