396 lines
11 KiB
C
396 lines
11 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <limits.h>
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#include "internal/cryptlib.h"
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#include <openssl/evp.h>
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#include "evp_locl.h"
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static unsigned char conv_ascii2bin(unsigned char a);
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#ifndef CHARSET_EBCDIC
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# define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
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#else
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/*
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* We assume that PEM encoded files are EBCDIC files (i.e., printable text
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* files). Convert them here while decoding. When encoding, output is EBCDIC
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* (text) format again. (No need for conversion in the conv_bin2ascii macro,
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* as the underlying textstring data_bin2ascii[] is already EBCDIC)
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*/
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# define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
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#endif
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/*-
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* 64 char lines
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* pad input with 0
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* left over chars are set to =
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* 1 byte => xx==
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* 2 bytes => xxx=
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* 3 bytes => xxxx
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*/
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#define BIN_PER_LINE (64/4*3)
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#define CHUNKS_PER_LINE (64/4)
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#define CHAR_PER_LINE (64+1)
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static const unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
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abcdefghijklmnopqrstuvwxyz0123456789+/";
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/*-
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* 0xF0 is a EOLN
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* 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
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* 0xF2 is EOF
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* 0xE0 is ignore at start of line.
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* 0xFF is error
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*/
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#define B64_EOLN 0xF0
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#define B64_CR 0xF1
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#define B64_EOF 0xF2
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#define B64_WS 0xE0
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#define B64_ERROR 0xFF
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#define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
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#define B64_BASE64(a) (!B64_NOT_BASE64(a))
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static const unsigned char data_ascii2bin[128] = {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
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0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF,
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0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
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0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
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0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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};
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#ifndef CHARSET_EBCDIC
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static unsigned char conv_ascii2bin(unsigned char a)
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{
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if (a & 0x80)
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return B64_ERROR;
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return data_ascii2bin[a];
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}
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#else
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static unsigned char conv_ascii2bin(unsigned char a)
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{
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a = os_toascii[a];
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if (a & 0x80)
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return B64_ERROR;
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return data_ascii2bin[a];
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}
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#endif
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EVP_ENCODE_CTX *EVP_ENCODE_CTX_new(void)
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{
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return OPENSSL_zalloc(sizeof(EVP_ENCODE_CTX));
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}
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void EVP_ENCODE_CTX_free(EVP_ENCODE_CTX *ctx)
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{
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OPENSSL_free(ctx);
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}
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int EVP_ENCODE_CTX_num(EVP_ENCODE_CTX *ctx)
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{
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return ctx->num;
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}
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void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
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{
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ctx->length = 48;
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ctx->num = 0;
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ctx->line_num = 0;
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}
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int EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int i, j;
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size_t total = 0;
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*outl = 0;
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if (inl <= 0)
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return 0;
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OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
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if (ctx->length - ctx->num > inl) {
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memcpy(&(ctx->enc_data[ctx->num]), in, inl);
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ctx->num += inl;
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return 1;
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}
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if (ctx->num != 0) {
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i = ctx->length - ctx->num;
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memcpy(&(ctx->enc_data[ctx->num]), in, i);
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in += i;
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inl -= i;
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j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length);
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ctx->num = 0;
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out += j;
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*(out++) = '\n';
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*out = '\0';
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total = j + 1;
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}
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while (inl >= ctx->length && total <= INT_MAX) {
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j = EVP_EncodeBlock(out, in, ctx->length);
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in += ctx->length;
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inl -= ctx->length;
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out += j;
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*(out++) = '\n';
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*out = '\0';
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total += j + 1;
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}
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if (total > INT_MAX) {
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/* Too much output data! */
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*outl = 0;
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return 0;
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}
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if (inl != 0)
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memcpy(&(ctx->enc_data[0]), in, inl);
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ctx->num = inl;
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*outl = total;
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return 1;
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}
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void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
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{
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unsigned int ret = 0;
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if (ctx->num != 0) {
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ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num);
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out[ret++] = '\n';
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out[ret] = '\0';
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ctx->num = 0;
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}
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*outl = ret;
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}
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int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
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{
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int i, ret = 0;
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unsigned long l;
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for (i = dlen; i > 0; i -= 3) {
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if (i >= 3) {
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l = (((unsigned long)f[0]) << 16L) |
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(((unsigned long)f[1]) << 8L) | f[2];
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*(t++) = conv_bin2ascii(l >> 18L);
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*(t++) = conv_bin2ascii(l >> 12L);
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*(t++) = conv_bin2ascii(l >> 6L);
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*(t++) = conv_bin2ascii(l);
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} else {
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l = ((unsigned long)f[0]) << 16L;
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if (i == 2)
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l |= ((unsigned long)f[1] << 8L);
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*(t++) = conv_bin2ascii(l >> 18L);
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*(t++) = conv_bin2ascii(l >> 12L);
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*(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L);
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*(t++) = '=';
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}
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ret += 4;
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f += 3;
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}
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*t = '\0';
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return (ret);
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}
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void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
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{
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/* Only ctx->num is used during decoding. */
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ctx->num = 0;
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ctx->length = 0;
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ctx->line_num = 0;
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ctx->expect_nl = 0;
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}
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/*-
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* -1 for error
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* 0 for last line
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* 1 for full line
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*
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* Note: even though EVP_DecodeUpdate attempts to detect and report end of
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* content, the context doesn't currently remember it and will accept more data
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* in the next call. Therefore, the caller is responsible for checking and
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* rejecting a 0 return value in the middle of content.
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*
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* Note: even though EVP_DecodeUpdate has historically tried to detect end of
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* content based on line length, this has never worked properly. Therefore,
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* we now return 0 when one of the following is true:
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* - Padding or B64_EOF was detected and the last block is complete.
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* - Input has zero-length.
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* -1 is returned if:
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* - Invalid characters are detected.
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* - There is extra trailing padding, or data after padding.
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* - B64_EOF is detected after an incomplete base64 block.
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*/
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int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int seof = 0, eof = 0, rv = -1, ret = 0, i, v, tmp, n, decoded_len;
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unsigned char *d;
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n = ctx->num;
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d = ctx->enc_data;
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if (n > 0 && d[n - 1] == '=') {
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eof++;
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if (n > 1 && d[n - 2] == '=')
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eof++;
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}
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/* Legacy behaviour: an empty input chunk signals end of input. */
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if (inl == 0) {
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rv = 0;
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goto end;
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}
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for (i = 0; i < inl; i++) {
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tmp = *(in++);
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v = conv_ascii2bin(tmp);
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if (v == B64_ERROR) {
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rv = -1;
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goto end;
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}
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if (tmp == '=') {
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eof++;
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} else if (eof > 0 && B64_BASE64(v)) {
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/* More data after padding. */
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rv = -1;
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goto end;
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}
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if (eof > 2) {
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rv = -1;
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goto end;
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}
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if (v == B64_EOF) {
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seof = 1;
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goto tail;
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}
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/* Only save valid base64 characters. */
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if (B64_BASE64(v)) {
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if (n >= 64) {
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/*
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* We increment n once per loop, and empty the buffer as soon as
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* we reach 64 characters, so this can only happen if someone's
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* manually messed with the ctx. Refuse to write any more data.
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*/
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rv = -1;
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goto end;
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}
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OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
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d[n++] = tmp;
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}
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if (n == 64) {
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decoded_len = EVP_DecodeBlock(out, d, n);
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n = 0;
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if (decoded_len < 0 || eof > decoded_len) {
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rv = -1;
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goto end;
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}
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ret += decoded_len - eof;
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out += decoded_len - eof;
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}
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}
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/*
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* Legacy behaviour: if the current line is a full base64-block (i.e., has
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* 0 mod 4 base64 characters), it is processed immediately. We keep this
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* behaviour as applications may not be calling EVP_DecodeFinal properly.
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*/
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tail:
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if (n > 0) {
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if ((n & 3) == 0) {
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decoded_len = EVP_DecodeBlock(out, d, n);
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n = 0;
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if (decoded_len < 0 || eof > decoded_len) {
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rv = -1;
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goto end;
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}
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ret += (decoded_len - eof);
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} else if (seof) {
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/* EOF in the middle of a base64 block. */
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rv = -1;
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goto end;
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}
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}
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rv = seof || (n == 0 && eof) ? 0 : 1;
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end:
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/* Legacy behaviour. This should probably rather be zeroed on error. */
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*outl = ret;
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ctx->num = n;
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return (rv);
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}
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int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
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{
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int i, ret = 0, a, b, c, d;
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unsigned long l;
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/* trim white space from the start of the line. */
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while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) {
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f++;
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n--;
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}
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/*
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* strip off stuff at the end of the line ascii2bin values B64_WS,
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* B64_EOLN, B64_EOLN and B64_EOF
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*/
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while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1]))))
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n--;
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if (n % 4 != 0)
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return (-1);
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for (i = 0; i < n; i += 4) {
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a = conv_ascii2bin(*(f++));
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b = conv_ascii2bin(*(f++));
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c = conv_ascii2bin(*(f++));
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d = conv_ascii2bin(*(f++));
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if ((a & 0x80) || (b & 0x80) || (c & 0x80) || (d & 0x80))
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return (-1);
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l = ((((unsigned long)a) << 18L) |
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(((unsigned long)b) << 12L) |
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(((unsigned long)c) << 6L) | (((unsigned long)d)));
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*(t++) = (unsigned char)(l >> 16L) & 0xff;
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*(t++) = (unsigned char)(l >> 8L) & 0xff;
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*(t++) = (unsigned char)(l) & 0xff;
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ret += 3;
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}
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return (ret);
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}
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int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
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{
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int i;
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*outl = 0;
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if (ctx->num != 0) {
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i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);
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if (i < 0)
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return (-1);
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ctx->num = 0;
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*outl = i;
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return (1);
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} else
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return (1);
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}
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