From 797bab2006d0708a9a86c1cbea1d615644730988 Mon Sep 17 00:00:00 2001 From: Chris Hanson Date: Mon, 9 Aug 1999 18:29:38 +0000 Subject: [PATCH] Eliminate BLOWFISH-CFB64. Modify BLOWFISH-CBC and BLOWFISH-CFB64-SUBSTRING to accept the output buffer as an argument. This allows better control of memory allocation. Also modify BLOWFISH-CFB64-SUBSTRING to return the new value of `num' so that the Scheme code need not re-compute it. --- v7/src/microcode/prbfish.c | 122 +++++++++++++++---------------------- 1 file changed, 49 insertions(+), 73 deletions(-) diff --git a/v7/src/microcode/prbfish.c b/v7/src/microcode/prbfish.c index 39793e936..ead902b05 100644 --- a/v7/src/microcode/prbfish.c +++ b/v7/src/microcode/prbfish.c @@ -1,6 +1,6 @@ /* -*-C-*- -$Id: prbfish.c,v 1.4 1999/01/02 06:11:34 cph Exp $ +$Id: prbfish.c,v 1.5 1999/08/09 18:29:38 cph Exp $ Copyright (c) 1997, 1999 Massachusetts Institute of Technology @@ -66,10 +66,11 @@ DEFUN (init_vector_arg, (arg), unsigned int arg) return (STRING_LOC ((ARG_REF (arg)), 0)); } -DEFINE_PRIMITIVE ("BLOWFISH-CBC", Prim_blowfish_cbc, 4, 4, - "(INPUT KEY INIT-VECTOR ENCRYPT?)\n\ +DEFINE_PRIMITIVE ("BLOWFISH-CBC-V2", Prim_blowfish_cbc, 5, 5, + "(INPUT OUTPUT KEY INIT-VECTOR ENCRYPT?)\n\ Apply Blowfish in Cipher Block Chaining mode.\n\ INPUT is a string whose length is a multiple of 8 bytes.\n\ +OUTPUT is a string whose length is the same as INPUT.\n\ KEY is a Blowfish key.\n\ INIT-VECTOR is an 8-byte string; it is modified after each call.\n\ The value from any call may be passed in to a later call.\n\ @@ -77,99 +78,74 @@ ENCRYPT? says whether to encrypt (#T) or decrypt (#F).\n\ Returned value is a string of the same length as INPUT.") { SCHEME_OBJECT input_text; - BF_KEY * key; - unsigned char * init_vector; SCHEME_OBJECT output_text; - PRIMITIVE_HEADER (4); + PRIMITIVE_HEADER (5); CHECK_ARG (1, STRING_P); input_text = (ARG_REF (1)); if (((STRING_LENGTH (input_text)) % 8) != 0) error_bad_range_arg (1); - key = (key_arg (2)); - init_vector = (init_vector_arg (3)); - output_text = (allocate_string (STRING_LENGTH (input_text))); + CHECK_ARG (2, STRING_P); + output_text = (ARG_REF (2)); + if ((output_text == input_text) + || ((STRING_LENGTH (output_text)) != (STRING_LENGTH (input_text)))) + error_bad_range_arg (2); BF_cbc_encrypt ((STRING_LOC (input_text, 0)), (STRING_LOC (output_text, 0)), (STRING_LENGTH (input_text)), - key, - init_vector, - (BOOLEAN_ARG (4))); - PRIMITIVE_RETURN (output_text); -} - -DEFINE_PRIMITIVE ("BLOWFISH-CFB64", Prim_blowfish_cfb64, 5, 5, - "(INPUT KEY INIT-VECTOR NUM ENCRYPT?)\n\ -Apply Blowfish in Cipher FeedBack mode.\n\ -INPUT is an arbitrary string.\n\ -KEY is a Blowfish key.\n\ -INIT-VECTOR is an 8-byte string; it is modified after each call.\n\ - The value from any call may be passed in to a later call.\n\ -NUM is a digit from 0 to 7 inclusive; it is the low 3 bits of the\n\ - number of bytes that have previously been processed in this stream.\n\ -ENCRYPT? says whether to encrypt (#T) or decrypt (#F).\n\ -Returned value is a string of the same length as INPUT.") -{ - SCHEME_OBJECT input_text; - BF_KEY * key; - unsigned char * init_vector; - int num; - SCHEME_OBJECT output_text; - PRIMITIVE_HEADER (5); - - CHECK_ARG (1, STRING_P); - input_text = (ARG_REF (1)); - key = (key_arg (2)); - init_vector = (init_vector_arg (3)); - num = (arg_index_integer (4, 8)); - output_text = (allocate_string (STRING_LENGTH (input_text))); - BF_cfb64_encrypt ((STRING_LOC (input_text, 0)), - (STRING_LOC (output_text, 0)), - (STRING_LENGTH (input_text)), - key, - init_vector, - (&num), - (BOOLEAN_ARG (5))); - PRIMITIVE_RETURN (output_text); + (key_arg (3)), + (init_vector_arg (4)), + (BOOLEAN_ARG (5))); + PRIMITIVE_RETURN (UNSPECIFIC); } -DEFINE_PRIMITIVE ("BLOWFISH-CFB64-SUBSTRING", Prim_blowfish_cfb64_substring, 7, 7, - "(INPUT START END KEY INIT-VECTOR NUM ENCRYPT?)\n\ -Apply Blowfish in Cipher FeedBack mode.\n\ -(INPUT,START,END) is an arbitrary substring.\n\ +DEFINE_PRIMITIVE ("BLOWFISH-CFB64-SUBSTRING-V2", Prim_blowfish_cfb64_substring, 9, 9, + "(INPUT ISTART IEND OUTPUT OSTART KEY INIT-VECTOR NUM ENCRYPT?)\n\ +Apply Blowfish in Cipher Feed-Back mode.\n\ +(INPUT,ISTART,IEND) is an arbitrary substring.\n\ +OUTPUT is a string as large as the input substring.\n\ +OSTART says where to start writing to the output string.\n\ KEY is a Blowfish key.\n\ INIT-VECTOR is an 8-byte string; it is modified after each call.\n\ The value from any call may be passed in to a later call.\n\ + The initial value must be unique for each message/key pair.\n\ NUM is a digit from 0 to 7 inclusive; it is the low 3 bits of the\n\ number of bytes that have previously been processed in this stream.\n\ ENCRYPT? says whether to encrypt (#T) or decrypt (#F).\n\ -Returned value is a string of the same length as INPUT.") +Returned value is the new value of NUM.") { SCHEME_OBJECT input_text; unsigned long l; - unsigned long start; - unsigned long end; - BF_KEY * key; - unsigned char * init_vector; - int num; + unsigned long istart; + unsigned long iend; + unsigned long ilen; SCHEME_OBJECT output_text; - PRIMITIVE_HEADER (7); + unsigned long ostart; + int num; + PRIMITIVE_HEADER (9); CHECK_ARG (1, STRING_P); input_text = (ARG_REF (1)); - l = (STRING_LENGTH (input_text)); - start = (arg_ulong_index_integer (2, l)); - end = (arg_integer_in_range (3, start, (l + 1))); - key = (key_arg (4)); - init_vector = (init_vector_arg (5)); - num = (arg_index_integer (6, 8)); - output_text = (allocate_string (end - start)); - BF_cfb64_encrypt ((STRING_LOC (input_text, start)), - (STRING_LOC (output_text, 0)), - (end - start), - key, - init_vector, + { + unsigned long l = (STRING_LENGTH (input_text)); + istart = (arg_ulong_index_integer (2, l)); + iend = (arg_integer_in_range (3, istart, (l + 1))); + } + ilen = (iend - istart); + CHECK_ARG (4, STRING_P); + output_text = (ARG_REF (4)); + ostart = (arg_ulong_index_integer (5, (STRING_LENGTH (output_text)))); + if ((output_text == input_text) + && (ostart < iend) + && (istart < (ostart + ilen))) + error_bad_range_arg (4); + num = (arg_index_integer (8, 8)); + BF_cfb64_encrypt ((STRING_LOC (input_text, istart)), + (STRING_LOC (output_text, ostart)), + ilen, + (key_arg (6)), + (init_vector_arg (7)), (&num), - (BOOLEAN_ARG (7))); - PRIMITIVE_RETURN (output_text); + (BOOLEAN_ARG (9))); + PRIMITIVE_RETURN (long_to_integer (num)); } -- 2.25.1