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Send encrypted messages

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This commit is contained in:
James Booth
2015-03-24 23:34:24 +00:00
parent 551f7df1f7
commit eb5cb7b2f8
5 changed files with 109 additions and 19 deletions
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92
src/pgp/gpg.c
View File

@@ -42,13 +42,14 @@
#include "pgp/gpg.h"
#include "log.h"
#define PGP_HEADER "-----BEGIN PGP SIGNATURE-----"
#define PGP_FOOTER "-----END PGP SIGNATURE-----"
#define PGP_SIGNATURE_HEADER "-----BEGIN PGP SIGNATURE-----"
#define PGP_SIGNATURE_FOOTER "-----END PGP SIGNATURE-----"
#define PGP_MESSAGE_FOOTER "-----END PGP MESSAGE-----"
static const char *libversion;
static GHashTable *fingerprints;
static char* _remove_header_footer(char *str);
static char* _remove_header_footer(char *str, const char * const footer);
static char* _add_header_footer(const char * const str);
void
@@ -171,7 +172,7 @@ p_gpg_verify(const char * const barejid, const char *const sign)
}
char*
p_gpg_sign_str(const char * const str, const char * const fp)
p_gpg_sign(const char * const str, const char * const fp)
{
gpgme_ctx_t ctx;
gpgme_error_t error = gpgme_new(&ctx);
@@ -222,7 +223,7 @@ p_gpg_sign_str(const char * const str, const char * const fp)
char *signed_str = gpgme_data_release_and_get_mem(signed_data, &len);
if (signed_str != NULL) {
signed_str[len] = 0;
result = _remove_header_footer(signed_str);
result = _remove_header_footer(signed_str, PGP_SIGNATURE_FOOTER);
}
gpgme_free(signed_str);
gpgme_release(ctx);
@@ -231,26 +232,85 @@ p_gpg_sign_str(const char * const str, const char * const fp)
return result;
}
static char*
_remove_header_footer(char *str)
char *
p_gpg_encrypt(const char * const barejid, const char * const message)
{
char *pointer = str;
char *fp = g_hash_table_lookup(fingerprints, barejid);
if (!fp) {
return NULL;
}
gpgme_key_t keys[2];
keys[0] = NULL;
keys[1] = NULL;
gpgme_ctx_t ctx;
gpgme_error_t error = gpgme_new(&ctx);
if (error) {
log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
return NULL;
}
gpgme_key_t key;
error = gpgme_get_key(ctx, fp, &key, 0);
if (error || key == NULL) {
log_error("GPG: Failed to get key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
gpgme_release(ctx);
return NULL;
}
keys[0] = key;
gpgme_data_t plain;
gpgme_data_t cipher;
gpgme_data_new_from_mem(&plain, message, strlen(message), 1);
gpgme_data_new(&cipher);
gpgme_set_armor(ctx, 1);
error = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, plain, cipher);
if (error) {
log_error("GPG: Failed to encrypt message. %s %s", gpgme_strsource(error), gpgme_strerror(error));
gpgme_release(ctx);
return NULL;
}
gpgme_data_release(plain);
char *cipher_str = NULL;
char *result = NULL;
size_t len;
cipher_str = gpgme_data_release_and_get_mem(cipher, &len);
if (cipher_str) {
result = _remove_header_footer(cipher_str, PGP_MESSAGE_FOOTER);
}
gpgme_free(cipher_str);
gpgme_release(ctx);
return result;
}
static char*
_remove_header_footer(char *str, const char * const footer)
{
int pos = 0;
int newlines = 0;
while (newlines < 3) {
if (pointer[0] == '\n') {
if (str[pos] == '\n') {
newlines++;
}
pointer++;
pos++;
if (strlen(pointer) == 0) {
if (str[pos] == '\0') {
return NULL;
}
}
char *stripped = malloc(strlen(pointer)+1-strlen(PGP_FOOTER));
strncpy(stripped,pointer,strlen(pointer)-strlen(PGP_FOOTER));
stripped[strlen(pointer)-strlen(PGP_FOOTER)] = '\0';
char *stripped = strdup(&str[pos]);
char *footer_start = g_strrstr(stripped, footer);
footer_start[0] = '\0';
return stripped;
}
@@ -260,11 +320,11 @@ _add_header_footer(const char * const str)
{
GString *result_str = g_string_new("");
g_string_append(result_str, PGP_HEADER);
g_string_append(result_str, PGP_SIGNATURE_HEADER);
g_string_append(result_str, "\n\n");
g_string_append(result_str, str);
g_string_append(result_str, "\n");
g_string_append(result_str, PGP_FOOTER);
g_string_append(result_str, PGP_SIGNATURE_FOOTER);
char *result = result_str->str;
g_string_free(result_str, FALSE);

3
src/pgp/gpg.h
View File

@@ -47,7 +47,8 @@ GSList* p_gpg_list_keys(void);
GHashTable* p_gpg_fingerprints(void);
const char* p_gpg_libver(void);
void p_gpg_free_key(ProfPGPKey *key);
char* p_gpg_sign_str(const char * const str, const char * const fp);
char* p_gpg_sign(const char * const str, const char * const fp);
void p_gpg_verify(const char * const barejid, const char *const sign);
char* p_gpg_encrypt(const char * const barejid, const char * const message);
#endif