crypt: Deduplicate get_public_key().

[paraslash.git] / gcrypt.c

diff --git a/gcrypt.c b/gcrypt.c
index 052546dd60733d143e6c12bdcfcc92ce36ac5e50..2398a605d29211d8581b5b76e0cb586258fe0898 100644 (file)
--- a/gcrypt.c
+++ b/gcrypt.c
@@ -366,27 +366,21 @@ free_blob:
        return ret;
 }
 
-static int get_ssh_public_key(unsigned char *data, int size, gcry_sexp_t *result)
+int get_public_key(const char *key_file, struct asymmetric_key **result)
 {
+       unsigned char *blob, *p, *end;
        int ret;
        gcry_error_t gret;
-       unsigned char *blob = NULL, *p, *end;
        size_t nr_scanned, erroff, decoded_size;
-       gcry_mpi_t e = NULL, n = NULL;
+       gcry_mpi_t e, n;
+       gcry_sexp_t sexp;
+       struct asymmetric_key *key;
 
-       PARA_DEBUG_LOG("decoding %d byte public rsa-ssh key\n", size);
-       ret = uudecode((char *)data, size, (char **)&blob, &decoded_size);
-       if (ret < 0)
-               goto free_blob;
-       end = blob + decoded_size;
-       dump_buffer("decoded key", blob, decoded_size);
-       ret = check_ssh_key_header(blob, decoded_size);
+       ret = decode_ssh_key(key_file, &blob, &decoded_size);
        if (ret < 0)
-               goto free_blob;
+               return ret;
        p = blob + ret;
-       ret = -E_SSH_PARSE;
-       if (p >= end)
-               goto free_blob;
+       end = blob + decoded_size;
        PARA_DEBUG_LOG("scanning modulus and public exponent\n");
        gret = gcry_mpi_scan(&e, GCRYMPI_FMT_SSH, p, end - p, &nr_scanned);
        if (gret) {
@@ -395,8 +389,6 @@ static int get_ssh_public_key(unsigned char *data, int size, gcry_sexp_t *result
                goto free_blob;
        }
        PARA_DEBUG_LOG("scanned e (%zu bytes)\n", nr_scanned);
-//     gcry_mpi_aprint(GCRYMPI_FMT_HEX, &buf, NULL, rsa_e);
-//     PARA_CRIT_LOG("e: %s\n", buf);
        p += nr_scanned;
        if (p >= end)
                goto release_e;
@@ -407,9 +399,7 @@ static int get_ssh_public_key(unsigned char *data, int size, gcry_sexp_t *result
                goto release_e;
        }
        PARA_DEBUG_LOG("scanned n (%zu bytes)\n", nr_scanned);
-//     gcry_mpi_aprint(GCRYMPI_FMT_HEX, &buf, NULL, rsa_n);
-//     PARA_CRIT_LOG("n: %s\n", buf);
-       gret = gcry_sexp_build(result, &erroff, RSA_PUBKEY_SEXP, n, e);
+       gret = gcry_sexp_build(&sexp, &erroff, RSA_PUBKEY_SEXP, n, e);
        if (gret) {
                PARA_ERROR_LOG("offset %zu: %s\n", erroff,
                        gcry_strerror(gcry_err_code(gret)));
@@ -418,6 +408,10 @@ static int get_ssh_public_key(unsigned char *data, int size, gcry_sexp_t *result
        }
        ret = nr_scanned / 32 * 32;
        PARA_INFO_LOG("successfully read %d bit ssh public key\n", ret * 8);
+       key = para_malloc(sizeof(*key));
+       key->num_bytes = ret;
+       key->sexp = sexp;
+       *result = key;
 release_n:
        gcry_mpi_release(n);
 release_e:
@@ -427,42 +421,6 @@ free_blob:
        return ret;
 }
 
-int get_public_key(const char *key_file, struct asymmetric_key **result)
-{
-       int ret, ret2;
-       void *map;
-       size_t map_size;
-       unsigned char *start, *end;
-       gcry_sexp_t sexp;
-       struct asymmetric_key *key;
-
-       ret = mmap_full_file(key_file, O_RDONLY, &map, &map_size, NULL);
-       if (ret < 0)
-               return ret;
-       ret = is_ssh_rsa_key(map, map_size);
-       if (!ret) {
-               para_munmap(map, map_size);
-               return -E_SSH_PARSE;
-       }
-       start = map + ret;
-       end = map + map_size;
-       ret = -E_SSH_PARSE;
-       if (start >= end)
-               goto unmap;
-       ret = get_ssh_public_key(start, end - start, &sexp);
-       if (ret < 0)
-               goto unmap;
-       key = para_malloc(sizeof(*key));
-       key->num_bytes = ret;
-       key->sexp = sexp;
-       *result = key;
-unmap:
-       ret2 = para_munmap(map, map_size);
-       if (ret >= 0 && ret2 < 0)
-               ret = ret2;
-       return ret;
-}
-
 void free_public_key(struct asymmetric_key *key)
 {
        if (!key)