From 875c23baac204532a144ab49d80b773a8cd05ebb Mon Sep 17 00:00:00 2001 From: Emilia Kasper Date: Thu, 17 Sep 2015 20:08:48 +0200 Subject: base64 decode: check for high bit Previously, the conversion would silently coerce to ASCII. Now, we error out. Reviewed-by: Richard Levitte (cherry picked from commit b785504a10310cb2872270eb409b70971be5e76e) --- crypto/evp/encode.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/crypto/evp/encode.c b/crypto/evp/encode.c index f758a8c..3005560 100644 --- a/crypto/evp/encode.c +++ b/crypto/evp/encode.c @@ -60,9 +60,9 @@ #include "cryptlib.h" #include +static unsigned char conv_ascii2bin(unsigned char a); #ifndef CHARSET_EBCDIC # define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f]) -# define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f]) #else /* * We assume that PEM encoded files are EBCDIC files (i.e., printable text @@ -71,7 +71,6 @@ * as the underlying textstring data_bin2ascii[] is already EBCDIC) */ # define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f]) -# define conv_ascii2bin(a) (data_ascii2bin[os_toascii[a]&0x7f]) #endif /*- @@ -124,6 +123,23 @@ static const unsigned char data_ascii2bin[128] = { 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, }; +#ifndef CHARSET_EBCDIC +static unsigned char conv_ascii2bin(unsigned char a) +{ + if (a & 0x80) + return B64_ERROR; + return data_ascii2bin[a]; +} +#else +static unsigned char conv_ascii2bin(unsigned char a) +{ + a = os_toascii[a]; + if (a & 0x80) + return B64_ERROR; + return data_ascii2bin[a]; +} +#endif + void EVP_EncodeInit(EVP_ENCODE_CTX *ctx) { ctx->length = 48; -- 1.7.12.1