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/*
* Copyright (c) 2018 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
#include <openssl/bio.h>
#include <openssl/evp.h>
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include "../openbsd-compat/openbsd-compat.h"
#include "extern.h"
int
base64_encode(const void *ptr, size_t len, char **out)
{
BIO *bio_b64 = NULL;
BIO *bio_mem = NULL;
char *b64_ptr = NULL;
long b64_len;
int n;
int ok = -1;
if (ptr == NULL || out == NULL || len > INT_MAX)
return (-1);
*out = NULL;
if ((bio_b64 = BIO_new(BIO_f_base64())) == NULL)
goto fail;
if ((bio_mem = BIO_new(BIO_s_mem())) == NULL)
goto fail;
BIO_set_flags(bio_b64, BIO_FLAGS_BASE64_NO_NL);
BIO_push(bio_b64, bio_mem);
n = BIO_write(bio_b64, ptr, (int)len);
if (n < 0 || (size_t)n != len)
goto fail;
if (BIO_flush(bio_b64) < 0)
goto fail;
b64_len = BIO_get_mem_data(bio_b64, &b64_ptr);
if (b64_len < 0 || (size_t)b64_len == SIZE_MAX || b64_ptr == NULL)
goto fail;
if ((*out = calloc(1, (size_t)b64_len + 1)) == NULL)
goto fail;
memcpy(*out, b64_ptr, (size_t)b64_len);
ok = 0;
fail:
BIO_free(bio_b64);
BIO_free(bio_mem);
return (ok);
}
int
base64_decode(const char *in, void **ptr, size_t *len)
{
BIO *bio_mem = NULL;
BIO *bio_b64 = NULL;
size_t alloc_len;
int n;
int ok = -1;
if (in == NULL || ptr == NULL || len == NULL || strlen(in) > INT_MAX)
return (-1);
*ptr = NULL;
*len = 0;
if ((bio_b64 = BIO_new(BIO_f_base64())) == NULL)
goto fail;
if ((bio_mem = BIO_new_mem_buf((const void *)in, -1)) == NULL)
goto fail;
BIO_set_flags(bio_b64, BIO_FLAGS_BASE64_NO_NL);
BIO_push(bio_b64, bio_mem);
alloc_len = strlen(in);
if ((*ptr = calloc(1, alloc_len)) == NULL)
goto fail;
n = BIO_read(bio_b64, *ptr, (int)alloc_len);
if (n <= 0 || BIO_eof(bio_b64) == 0)
goto fail;
*len = (size_t)n;
ok = 0;
fail:
BIO_free(bio_b64);
BIO_free(bio_mem);
if (ok < 0) {
free(*ptr);
*ptr = NULL;
*len = 0;
}
return (ok);
}
int
base64_read(FILE *f, struct blob *out)
{
char *line = NULL;
size_t linesize = 0;
ssize_t n;
out->ptr = NULL;
out->len = 0;
if ((n = getline(&line, &linesize, f)) <= 0 ||
(size_t)n != strlen(line)) {
free(line); /* XXX should be free'd _even_ if getline() fails */
return (-1);
}
if (base64_decode(line, (void **)&out->ptr, &out->len) < 0) {
free(line);
return (-1);
}
free(line);
return (0);
}
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