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Diffstat (limited to 'polarssl/src/library/pem.c')
| -rw-r--r-- | polarssl/src/library/pem.c | 352 |
1 files changed, 0 insertions, 352 deletions
diff --git a/polarssl/src/library/pem.c b/polarssl/src/library/pem.c deleted file mode 100644 index 33e74ab..0000000 --- a/polarssl/src/library/pem.c +++ /dev/null @@ -1,352 +0,0 @@ -/* - * Privacy Enhanced Mail (PEM) decoding - * - * Copyright (C) 2006-2010, Brainspark B.V. - * - * This file is part of PolarSSL (http://www.polarssl.org) - * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> - * - * All rights reserved. - * - * 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. - */ - -#include "polarssl/config.h" - -#if defined(POLARSSL_PEM_C) - -#include "polarssl/pem.h" -#include "polarssl/base64.h" -#include "polarssl/des.h" -#include "polarssl/aes.h" -#include "polarssl/md5.h" -#include "polarssl/cipher.h" - -#include <stdlib.h> - -void pem_init( pem_context *ctx ) -{ - memset( ctx, 0, sizeof( pem_context ) ); -} - -#if defined(POLARSSL_MD5_C) && (defined(POLARSSL_DES_C) || defined(POLARSSL_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( POLARSSL_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 ) -{ - md5_context md5_ctx; - unsigned char md5sum[16]; - size_t use_len; - - /* - * key[ 0..15] = MD5(pwd || IV) - */ - md5_starts( &md5_ctx ); - md5_update( &md5_ctx, pwd, pwdlen ); - md5_update( &md5_ctx, iv, 8 ); - md5_finish( &md5_ctx, md5sum ); - - if( keylen <= 16 ) - { - memcpy( key, md5sum, keylen ); - - memset( &md5_ctx, 0, sizeof( md5_ctx ) ); - memset( md5sum, 0, 16 ); - return; - } - - memcpy( key, md5sum, 16 ); - - /* - * key[16..23] = MD5(key[ 0..15] || pwd || IV]) - */ - md5_starts( &md5_ctx ); - md5_update( &md5_ctx, md5sum, 16 ); - md5_update( &md5_ctx, pwd, pwdlen ); - md5_update( &md5_ctx, iv, 8 ); - md5_finish( &md5_ctx, md5sum ); - - use_len = 16; - if( keylen < 32 ) - use_len = keylen - 16; - - memcpy( key + 16, md5sum, use_len ); - - memset( &md5_ctx, 0, sizeof( md5_ctx ) ); - memset( md5sum, 0, 16 ); -} - -#if defined(POLARSSL_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 ) -{ - des_context des_ctx; - unsigned char des_key[8]; - - pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen ); - - des_setkey_dec( &des_ctx, des_key ); - des_crypt_cbc( &des_ctx, DES_DECRYPT, buflen, - des_iv, buf, buf ); - - memset( &des_ctx, 0, sizeof( des_ctx ) ); - memset( des_key, 0, 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 ) -{ - des3_context des3_ctx; - unsigned char des3_key[24]; - - pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen ); - - des3_set3key_dec( &des3_ctx, des3_key ); - des3_crypt_cbc( &des3_ctx, DES_DECRYPT, buflen, - des3_iv, buf, buf ); - - memset( &des3_ctx, 0, sizeof( des3_ctx ) ); - memset( des3_key, 0, 24 ); -} -#endif /* POLARSSL_DES_C */ - -#if defined(POLARSSL_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 ) -{ - aes_context aes_ctx; - unsigned char aes_key[32]; - - pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen ); - - aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 ); - aes_crypt_cbc( &aes_ctx, AES_DECRYPT, buflen, - aes_iv, buf, buf ); - - memset( &aes_ctx, 0, sizeof( aes_ctx ) ); - memset( aes_key, 0, keylen ); -} -#endif /* POLARSSL_AES_C */ - -#endif /* POLARSSL_MD5_C && (POLARSSL_AES_C || POLARSSL_DES_C) */ - -int pem_read_buffer( pem_context *ctx, char *header, 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; - unsigned char *s1, *s2; -#if defined(POLARSSL_MD5_C) && (defined(POLARSSL_DES_C) || defined(POLARSSL_AES_C)) - unsigned char pem_iv[16]; - cipher_type_t enc_alg = POLARSSL_CIPHER_NONE; -#else - ((void) pwd); - ((void) pwdlen); -#endif /* POLARSSL_MD5_C && (POLARSSL_AES_C || POLARSSL_DES_C) */ - - if( ctx == NULL ) - return( POLARSSL_ERR_PEM_INVALID_DATA ); - - s1 = (unsigned char *) strstr( (char *) data, header ); - - if( s1 == NULL ) - return( POLARSSL_ERR_PEM_NO_HEADER_PRESENT ); - - s2 = (unsigned char *) strstr( (char *) data, footer ); - - if( s2 == NULL || s2 <= s1 ) - return( POLARSSL_ERR_PEM_INVALID_DATA ); - - s1 += strlen( header ); - if( *s1 == '\r' ) s1++; - if( *s1 == '\n' ) s1++; - else return( POLARSSL_ERR_PEM_INVALID_DATA ); - - enc = 0; - - if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 ) - { -#if defined(POLARSSL_MD5_C) && (defined(POLARSSL_DES_C) || defined(POLARSSL_AES_C)) - enc++; - - s1 += 22; - if( *s1 == '\r' ) s1++; - if( *s1 == '\n' ) s1++; - else return( POLARSSL_ERR_PEM_INVALID_DATA ); - - -#if defined(POLARSSL_DES_C) - if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 ) - { - enc_alg = POLARSSL_CIPHER_DES_EDE3_CBC; - - s1 += 23; - if( pem_get_iv( s1, pem_iv, 8 ) != 0 ) - return( POLARSSL_ERR_PEM_INVALID_ENC_IV ); - - s1 += 16; - } - else if( memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 ) - { - enc_alg = POLARSSL_CIPHER_DES_CBC; - - s1 += 18; - if( pem_get_iv( s1, pem_iv, 8) != 0 ) - return( POLARSSL_ERR_PEM_INVALID_ENC_IV ); - - s1 += 16; - } -#endif /* POLARSSL_DES_C */ - -#if defined(POLARSSL_AES_C) - if( memcmp( s1, "DEK-Info: AES-", 14 ) == 0 ) - { - if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 ) - enc_alg = POLARSSL_CIPHER_AES_128_CBC; - else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 ) - enc_alg = POLARSSL_CIPHER_AES_192_CBC; - else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 ) - enc_alg = POLARSSL_CIPHER_AES_256_CBC; - else - return( POLARSSL_ERR_PEM_UNKNOWN_ENC_ALG ); - - s1 += 22; - if( pem_get_iv( s1, pem_iv, 16 ) != 0 ) - return( POLARSSL_ERR_PEM_INVALID_ENC_IV ); - - s1 += 32; - } -#endif /* POLARSSL_AES_C */ - - if( enc_alg == POLARSSL_CIPHER_NONE ) - return( POLARSSL_ERR_PEM_UNKNOWN_ENC_ALG ); - - if( *s1 == '\r' ) s1++; - if( *s1 == '\n' ) s1++; - else return( POLARSSL_ERR_PEM_INVALID_DATA ); -#else - return( POLARSSL_ERR_PEM_FEATURE_UNAVAILABLE ); -#endif /* POLARSSL_MD5_C && (POLARSSL_AES_C || POLARSSL_DES_C) */ - } - - len = 0; - ret = base64_decode( NULL, &len, s1, s2 - s1 ); - - if( ret == POLARSSL_ERR_BASE64_INVALID_CHARACTER ) - return( POLARSSL_ERR_PEM_INVALID_DATA + ret ); - - if( ( buf = (unsigned char *) malloc( len ) ) == NULL ) - return( POLARSSL_ERR_PEM_MALLOC_FAILED ); - - if( ( ret = base64_decode( buf, &len, s1, s2 - s1 ) ) != 0 ) - { - free( buf ); - return( POLARSSL_ERR_PEM_INVALID_DATA + ret ); - } - - if( enc != 0 ) - { -#if defined(POLARSSL_MD5_C) && (defined(POLARSSL_DES_C) || defined(POLARSSL_AES_C)) - if( pwd == NULL ) - { - free( buf ); - return( POLARSSL_ERR_PEM_PASSWORD_REQUIRED ); - } - -#if defined(POLARSSL_DES_C) - if( enc_alg == POLARSSL_CIPHER_DES_EDE3_CBC ) - pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen ); - else if( enc_alg == POLARSSL_CIPHER_DES_CBC ) - pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen ); -#endif /* POLARSSL_DES_C */ - -#if defined(POLARSSL_AES_C) - if( enc_alg == POLARSSL_CIPHER_AES_128_CBC ) - pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen ); - else if( enc_alg == POLARSSL_CIPHER_AES_192_CBC ) - pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen ); - else if( enc_alg == POLARSSL_CIPHER_AES_256_CBC ) - pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen ); -#endif /* POLARSSL_AES_C */ - - if( buf[0] != 0x30 || buf[1] != 0x82 || - buf[4] != 0x02 || buf[5] != 0x01 ) - { - free( buf ); - return( POLARSSL_ERR_PEM_PASSWORD_MISMATCH ); - } -#else - return( POLARSSL_ERR_PEM_FEATURE_UNAVAILABLE ); -#endif - } - - ctx->buf = buf; - ctx->buflen = len; - s2 += strlen( footer ); - if( *s2 == '\r' ) s2++; - if( *s2 == '\n' ) s2++; - *use_len = s2 - data; - - return( 0 ); -} - -void pem_free( pem_context *ctx ) -{ - if( ctx->buf ) - free( ctx->buf ); - - if( ctx->info ) - free( ctx->info ); - - memset( ctx, 0, sizeof( pem_context ) ); -} - -#endif |