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IABSD.fr/src/lib/libcrypto/evp/evp_encode.c
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/* $OpenBSD: evp_encode.c,v 1.3 2024/04/09 13:52:41 beck Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <limits.h> #include <stdio.h> #include <string.h> #include <openssl/evp.h> #include "evp_local.h" static unsigned char conv_ascii2bin(unsigned char a); #define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f]) /* 64 char lines * pad input with 0 * left over chars are set to = * 1 byte => xx== * 2 bytes => xxx= * 3 bytes => xxxx */ #define BIN_PER_LINE (64/4*3) #define CHUNKS_PER_LINE (64/4) #define CHAR_PER_LINE (64+1) static const unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\ abcdefghijklmnopqrstuvwxyz0123456789+/"; /* 0xF0 is a EOLN * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing). * 0xF2 is EOF * 0xE0 is ignore at start of line. * 0xFF is error */ #define B64_EOLN 0xF0 #define B64_CR 0xF1 #define B64_EOF 0xF2 #define B64_WS 0xE0 #define B64_ERROR 0xFF #define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3) #define B64_BASE64(a) !B64_NOT_BASE64(a) static const unsigned char data_ascii2bin[128] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, }; static unsigned char conv_ascii2bin(unsigned char a) { if (a & 0x80) return B64_ERROR; return data_ascii2bin[a]; } EVP_ENCODE_CTX * EVP_ENCODE_CTX_new(void) { return calloc(1, sizeof(EVP_ENCODE_CTX)); } LCRYPTO_ALIAS(EVP_ENCODE_CTX_new); void EVP_ENCODE_CTX_free(EVP_ENCODE_CTX *ctx) { free(ctx); } LCRYPTO_ALIAS(EVP_ENCODE_CTX_free); void EVP_EncodeInit(EVP_ENCODE_CTX *ctx) { ctx->length = 48; ctx->num = 0; ctx->line_num = 0; } LCRYPTO_ALIAS(EVP_EncodeInit); int EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl) { int i, j; size_t total = 0; *outl = 0; if (inl <= 0) return 0; OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data)); if (ctx->length - ctx->num > inl) { memcpy(&(ctx->enc_data[ctx->num]), in, inl); ctx->num += inl; return 1; } if (ctx->num != 0) { i = ctx->length - ctx->num; memcpy(&(ctx->enc_data[ctx->num]), in, i); in += i; inl -= i; j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length); ctx->num = 0; out += j; *(out++) = '\n'; *out = '\0'; total = j + 1; } while (inl >= ctx->length && total <= INT_MAX) { j = EVP_EncodeBlock(out, in, ctx->length); in += ctx->length; inl -= ctx->length; out += j; *(out++) = '\n'; *out = '\0'; total += j + 1; } if (total > INT_MAX) { /* Too much output data! */ *outl = 0; return 0; } if (inl != 0) memcpy(&(ctx->enc_data[0]), in, inl); ctx->num = inl; *outl = total; return 1; } LCRYPTO_ALIAS(EVP_EncodeUpdate); void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl) { unsigned int ret = 0; if (ctx->num != 0) { ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num); out[ret++] = '\n'; out[ret] = '\0'; ctx->num = 0; } *outl = ret; } LCRYPTO_ALIAS(EVP_EncodeFinal); int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen) { int i, ret = 0; unsigned long l; for (i = dlen; i > 0; i -= 3) { if (i >= 3) { l = (((unsigned long)f[0]) << 16L) | (((unsigned long)f[1]) << 8L) | f[2]; *(t++) = conv_bin2ascii(l >> 18L); *(t++) = conv_bin2ascii(l >> 12L); *(t++) = conv_bin2ascii(l >> 6L); *(t++) = conv_bin2ascii(l ); } else { l = ((unsigned long)f[0]) << 16L; if (i == 2) l |= ((unsigned long)f[1] << 8L); *(t++) = conv_bin2ascii(l >> 18L); *(t++) = conv_bin2ascii(l >> 12L); *(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L); *(t++) = '='; } ret += 4; f += 3; } *t = '\0'; return (ret); } LCRYPTO_ALIAS(EVP_EncodeBlock); void EVP_DecodeInit(EVP_ENCODE_CTX *ctx) { ctx->num = 0; ctx->length = 0; ctx->line_num = 0; ctx->expect_nl = 0; } LCRYPTO_ALIAS(EVP_DecodeInit); int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl) { int seof = 0, eof = 0, rv = -1, ret = 0, i, v, tmp, n, decoded_len; unsigned char *d; n = ctx->num; d = ctx->enc_data; if (n > 0 && d[n - 1] == '=') { eof++; if (n > 1 && d[n - 2] == '=') eof++; } /* Legacy behaviour: an empty input chunk signals end of input. */ if (inl == 0) { rv = 0; goto end; } for (i = 0; i < inl; i++) { tmp = *(in++); v = conv_ascii2bin(tmp); if (v == B64_ERROR) { rv = -1; goto end; } if (tmp == '=') { eof++; } else if (eof > 0 && B64_BASE64(v)) { /* More data after padding. */ rv = -1; goto end; } if (eof > 2) { rv = -1; goto end; } if (v == B64_EOF) { seof = 1; goto tail; } /* Only save valid base64 characters. */ if (B64_BASE64(v)) { if (n >= 64) { /* * We increment n once per loop, and empty the * buffer as soon as we reach 64 characters, so * this can only happen if someone's manually * messed with the ctx. Refuse to write any * more data. */ rv = -1; goto end; } OPENSSL_assert(n < (int)sizeof(ctx->enc_data)); d[n++] = tmp; } if (n == 64) { decoded_len = EVP_DecodeBlock(out, d, n); n = 0; if (decoded_len < 0 || eof > decoded_len) { rv = -1; goto end; } ret += decoded_len - eof; out += decoded_len - eof; } } /* * Legacy behaviour: if the current line is a full base64-block (i.e., * has 0 mod 4 base64 characters), it is processed immediately. We keep * this behaviour as applications may not be calling EVP_DecodeFinal * properly. */ tail: if (n > 0) { if ((n & 3) == 0) { decoded_len = EVP_DecodeBlock(out, d, n); n = 0; if (decoded_len < 0 || eof > decoded_len) { rv = -1; goto end; } ret += (decoded_len - eof); } else if (seof) { /* EOF in the middle of a base64 block. */ rv = -1; goto end; } } rv = seof || (n == 0 && eof) ? 0 : 1; end: /* Legacy behaviour. This should probably rather be zeroed on error. */ *outl = ret; ctx->num = n; return (rv); } LCRYPTO_ALIAS(EVP_DecodeUpdate); int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n) { int i, ret = 0, a, b, c, d; unsigned long l; /* trim white space from the start of the line. */ while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) { f++; n--; } /* strip off stuff at the end of the line * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */ while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1])))) n--; if (n % 4 != 0) return (-1); for (i = 0; i < n; i += 4) { a = conv_ascii2bin(*(f++)); b = conv_ascii2bin(*(f++)); c = conv_ascii2bin(*(f++)); d = conv_ascii2bin(*(f++)); if ((a & 0x80) || (b & 0x80) || (c & 0x80) || (d & 0x80)) return (-1); l = ((((unsigned long)a) << 18L) | (((unsigned long)b) << 12L) | (((unsigned long)c) << 6L) | (((unsigned long)d))); *(t++) = (unsigned char)(l >> 16L) & 0xff; *(t++) = (unsigned char)(l >> 8L) & 0xff; *(t++) = (unsigned char)(l) & 0xff; ret += 3; } return (ret); } LCRYPTO_ALIAS(EVP_DecodeBlock); int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl) { int i; *outl = 0; if (ctx->num != 0) { i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num); if (i < 0) return (-1); ctx->num = 0; *outl = i; return (1); } else return (1); } LCRYPTO_ALIAS(EVP_DecodeFinal);