+++ /dev/null
-/*
- * Privacy Enhanced Mail (PEM) decoding
- *
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: GPL-2.0
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
-
-#include "mbedtls/pem.h"
-#include "mbedtls/base64.h"
-#include "mbedtls/des.h"
-#include "mbedtls/aes.h"
-#include "mbedtls/md5.h"
-#include "mbedtls/cipher.h"
-
-#include <string.h>
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#include <stdlib.h>
-#define mbedtls_calloc calloc
-#define mbedtls_free free
-#endif
-
-#if defined(MBEDTLS_PEM_PARSE_C)
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
- volatile unsigned char *p = v; while( n-- ) *p++ = 0;
-}
-
-void mbedtls_pem_init( mbedtls_pem_context *ctx )
-{
- memset( ctx, 0, sizeof( mbedtls_pem_context ) );
-}
-
-#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
- ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
-/*
- * Read a 16-byte hex string and convert it to binary
- */
-static int pem_get_iv( const unsigned char *s, unsigned char *iv,
- size_t iv_len )
-{
- size_t i, j, k;
-
- memset( iv, 0, iv_len );
-
- for( i = 0; i < iv_len * 2; i++, s++ )
- {
- if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
- if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
- if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
- return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
-
- k = ( ( i & 1 ) != 0 ) ? j : j << 4;
-
- iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
- }
-
- return( 0 );
-}
-
-static void pem_pbkdf1( unsigned char *key, size_t keylen,
- unsigned char *iv,
- const unsigned char *pwd, size_t pwdlen )
-{
- mbedtls_md5_context md5_ctx;
- unsigned char md5sum[16];
- size_t use_len;
-
- mbedtls_md5_init( &md5_ctx );
-
- /*
- * key[ 0..15] = MD5(pwd || IV)
- */
- mbedtls_md5_starts( &md5_ctx );
- mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
- mbedtls_md5_update( &md5_ctx, iv, 8 );
- mbedtls_md5_finish( &md5_ctx, md5sum );
-
- if( keylen <= 16 )
- {
- memcpy( key, md5sum, keylen );
-
- mbedtls_md5_free( &md5_ctx );
- mbedtls_zeroize( md5sum, 16 );
- return;
- }
-
- memcpy( key, md5sum, 16 );
-
- /*
- * key[16..23] = MD5(key[ 0..15] || pwd || IV])
- */
- mbedtls_md5_starts( &md5_ctx );
- mbedtls_md5_update( &md5_ctx, md5sum, 16 );
- mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
- mbedtls_md5_update( &md5_ctx, iv, 8 );
- mbedtls_md5_finish( &md5_ctx, md5sum );
-
- use_len = 16;
- if( keylen < 32 )
- use_len = keylen - 16;
-
- memcpy( key + 16, md5sum, use_len );
-
- mbedtls_md5_free( &md5_ctx );
- mbedtls_zeroize( md5sum, 16 );
-}
-
-#if defined(MBEDTLS_DES_C)
-/*
- * Decrypt with DES-CBC, using PBKDF1 for key derivation
- */
-static void pem_des_decrypt( unsigned char des_iv[8],
- unsigned char *buf, size_t buflen,
- const unsigned char *pwd, size_t pwdlen )
-{
- mbedtls_des_context des_ctx;
- unsigned char des_key[8];
-
- mbedtls_des_init( &des_ctx );
-
- pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
-
- mbedtls_des_setkey_dec( &des_ctx, des_key );
- mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
- des_iv, buf, buf );
-
- mbedtls_des_free( &des_ctx );
- mbedtls_zeroize( des_key, 8 );
-}
-
-/*
- * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
- */
-static void pem_des3_decrypt( unsigned char des3_iv[8],
- unsigned char *buf, size_t buflen,
- const unsigned char *pwd, size_t pwdlen )
-{
- mbedtls_des3_context des3_ctx;
- unsigned char des3_key[24];
-
- mbedtls_des3_init( &des3_ctx );
-
- pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
-
- mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
- mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
- des3_iv, buf, buf );
-
- mbedtls_des3_free( &des3_ctx );
- mbedtls_zeroize( des3_key, 24 );
-}
-#endif /* MBEDTLS_DES_C */
-
-#if defined(MBEDTLS_AES_C)
-/*
- * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
- */
-static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
- unsigned char *buf, size_t buflen,
- const unsigned char *pwd, size_t pwdlen )
-{
- mbedtls_aes_context aes_ctx;
- unsigned char aes_key[32];
-
- mbedtls_aes_init( &aes_ctx );
-
- pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
-
- mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
- mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
- aes_iv, buf, buf );
-
- mbedtls_aes_free( &aes_ctx );
- mbedtls_zeroize( aes_key, keylen );
-}
-#endif /* MBEDTLS_AES_C */
-
-#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
- ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
-
-int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
- const unsigned char *data, const unsigned char *pwd,
- size_t pwdlen, size_t *use_len )
-{
- int ret, enc;
- size_t len;
- unsigned char *buf;
- const unsigned char *s1, *s2, *end;
-#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
- ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
- unsigned char pem_iv[16];
- mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
-#else
- ((void) pwd);
- ((void) pwdlen);
-#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
- ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
-
- if( ctx == NULL )
- return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
-
- s1 = (unsigned char *) strstr( (const char *) data, header );
-
- if( s1 == NULL )
- return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
-
- s2 = (unsigned char *) strstr( (const char *) data, footer );
-
- if( s2 == NULL || s2 <= s1 )
- return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
-
- s1 += strlen( header );
- if( *s1 == ' ' ) s1++;
- if( *s1 == '\r' ) s1++;
- if( *s1 == '\n' ) s1++;
- else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
-
- end = s2;
- end += strlen( footer );
- if( *end == ' ' ) end++;
- if( *end == '\r' ) end++;
- if( *end == '\n' ) end++;
- *use_len = end - data;
-
- enc = 0;
-
- if( s2 - s1 >= 22 && memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
- {
-#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
- ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
- enc++;
-
- s1 += 22;
- if( *s1 == '\r' ) s1++;
- if( *s1 == '\n' ) s1++;
- else return( MBEDTLS_ERR_PEM_INVALID_DATA );
-
-
-#if defined(MBEDTLS_DES_C)
- if( s2 - s1 >= 23 && memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
- {
- enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
-
- s1 += 23;
- if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8 ) != 0 )
- return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
-
- s1 += 16;
- }
- else if( s2 - s1 >= 18 && memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
- {
- enc_alg = MBEDTLS_CIPHER_DES_CBC;
-
- s1 += 18;
- if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8) != 0 )
- return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
-
- s1 += 16;
- }
-#endif /* MBEDTLS_DES_C */
-
-#if defined(MBEDTLS_AES_C)
- if( s2 - s1 >= 14 && memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
- {
- if( s2 - s1 < 22 )
- return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
- else if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
- enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
- else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
- enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
- else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
- enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
- else
- return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
-
- s1 += 22;
- if( s2 - s1 < 32 || pem_get_iv( s1, pem_iv, 16 ) != 0 )
- return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
-
- s1 += 32;
- }
-#endif /* MBEDTLS_AES_C */
-
- if( enc_alg == MBEDTLS_CIPHER_NONE )
- return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
-
- if( *s1 == '\r' ) s1++;
- if( *s1 == '\n' ) s1++;
- else return( MBEDTLS_ERR_PEM_INVALID_DATA );
-#else
- return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
-#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
- ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
- }
-
- if( s1 >= s2 )
- return( MBEDTLS_ERR_PEM_INVALID_DATA );
-
- ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
-
- if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
- return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
-
- if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
- return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
-
- if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
- {
- mbedtls_free( buf );
- return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
- }
-
- if( enc != 0 )
- {
-#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
- ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
- if( pwd == NULL )
- {
- mbedtls_free( buf );
- return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
- }
-
-#if defined(MBEDTLS_DES_C)
- if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
- pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
- else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
- pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
-#endif /* MBEDTLS_DES_C */
-
-#if defined(MBEDTLS_AES_C)
- if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
- pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
- else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
- pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
- else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
- pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
-#endif /* MBEDTLS_AES_C */
-
- /*
- * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
- * length bytes (allow 4 to be sure) in all known use cases.
- *
- * Use that as heurisitic to try detecting password mismatchs.
- */
- if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
- {
- mbedtls_free( buf );
- return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
- }
-#else
- mbedtls_free( buf );
- return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
-#endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
- ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
- }
-
- ctx->buf = buf;
- ctx->buflen = len;
-
- return( 0 );
-}
-
-void mbedtls_pem_free( mbedtls_pem_context *ctx )
-{
- mbedtls_free( ctx->buf );
- mbedtls_free( ctx->info );
-
- mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
-}
-#endif /* MBEDTLS_PEM_PARSE_C */
-
-#if defined(MBEDTLS_PEM_WRITE_C)
-int mbedtls_pem_write_buffer( const char *header, const char *footer,
- const unsigned char *der_data, size_t der_len,
- unsigned char *buf, size_t buf_len, size_t *olen )
-{
- int ret;
- unsigned char *encode_buf, *c, *p = buf;
- size_t len = 0, use_len, add_len = 0;
-
- mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
- add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
-
- if( use_len + add_len > buf_len )
- {
- *olen = use_len + add_len;
- return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
- }
-
- if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
- return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
-
- if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
- der_len ) ) != 0 )
- {
- mbedtls_free( encode_buf );
- return( ret );
- }
-
- memcpy( p, header, strlen( header ) );
- p += strlen( header );
- c = encode_buf;
-
- while( use_len )
- {
- len = ( use_len > 64 ) ? 64 : use_len;
- memcpy( p, c, len );
- use_len -= len;
- p += len;
- c += len;
- *p++ = '\n';
- }
-
- memcpy( p, footer, strlen( footer ) );
- p += strlen( footer );
-
- *p++ = '\0';
- *olen = p - buf;
-
- mbedtls_free( encode_buf );
- return( 0 );
-}
-#endif /* MBEDTLS_PEM_WRITE_C */
-#endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */
projects / reactos.git / blobdiff