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authormarha <marha@users.sourceforge.net>2010-03-30 12:36:28 +0000
committermarha <marha@users.sourceforge.net>2010-03-30 12:36:28 +0000
commitff48c0d9098080b51ea12710029135916d117806 (patch)
tree96e6af9caf170ba21a1027b24e306a07e27d7b75 /openssl/engines/ccgost/gost_keywrap.c
parentbb731f5ac92655c4860a41fa818a7a63005f8369 (diff)
downloadvcxsrv-ff48c0d9098080b51ea12710029135916d117806.tar.gz
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svn merge -r514:HEAD ^/branches/released .
Diffstat (limited to 'openssl/engines/ccgost/gost_keywrap.c')
-rw-r--r--openssl/engines/ccgost/gost_keywrap.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/openssl/engines/ccgost/gost_keywrap.c b/openssl/engines/ccgost/gost_keywrap.c
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+++ b/openssl/engines/ccgost/gost_keywrap.c
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+/**********************************************************************
+ * keywrap.c *
+ * Copyright (c) 2005-2006 Cryptocom LTD *
+ * This file is distributed under the same license as OpenSSL *
+ * *
+ * Implementation of CryptoPro key wrap algorithm, as defined in *
+ * RFC 4357 p 6.3 and 6.4 *
+ * Doesn't need OpenSSL *
+ **********************************************************************/
+#include <string.h>
+#include "gost89.h"
+#include "gost_keywrap.h"
+
+/* Diversifies key using random UserKey Material
+ * Implements RFC 4357 p 6.5 key diversification algorithm
+ *
+ * inputKey - 32byte key to be diversified
+ * ukm - 8byte user key material
+ * outputKey - 32byte buffer to store diversified key
+ *
+ */
+void keyDiversifyCryptoPro(gost_ctx *ctx,const unsigned char *inputKey, const unsigned char *ukm, unsigned char *outputKey)
+ {
+
+ u4 k,s1,s2;
+ int i,j,mask;
+ unsigned char S[8];
+ memcpy(outputKey,inputKey,32);
+ for (i=0;i<8;i++)
+ {
+ /* Make array of integers from key */
+ /* Compute IV S*/
+ s1=0,s2=0;
+ for (j=0,mask=1;j<8;j++,mask<<=1)
+ {
+ k=((u4)outputKey[4*j])|(outputKey[4*j+1]<<8)|
+ (outputKey[4*j+2]<<16)|(outputKey[4*j+3]<<24);
+ if (mask & ukm[i])
+ {
+ s1+=k;
+ }
+ else
+ {
+ s2+=k;
+ }
+ }
+ S[0]=(unsigned char)(s1&0xff);
+ S[1]=(unsigned char)((s1>>8)&0xff);
+ S[2]=(unsigned char)((s1>>16)&0xff);
+ S[3]=(unsigned char)((s1>>24)&0xff);
+ S[4]=(unsigned char)(s2&0xff);
+ S[5]=(unsigned char)((s2>>8)&0xff);
+ S[6]=(unsigned char)((s2>>16)&0xff);
+ S[7]=(unsigned char)((s2>>24)&0xff);
+ gost_key(ctx,outputKey);
+ gost_enc_cfb(ctx,S,outputKey,outputKey,4);
+ }
+ }
+
+
+/*
+ * Wraps key using RFC 4357 6.3
+ * ctx - gost encryption context, initialized with some S-boxes
+ * keyExchangeKey (KEK) 32-byte (256-bit) shared key
+ * ukm - 8 byte (64 bit) user key material,
+ * sessionKey - 32-byte (256-bit) key to be wrapped
+ * wrappedKey - 44-byte buffer to store wrapped key
+ */
+
+int keyWrapCryptoPro(gost_ctx *ctx,const unsigned char *keyExchangeKey, const unsigned char *ukm,
+ const unsigned char *sessionKey, unsigned char *wrappedKey)
+ {
+ unsigned char kek_ukm[32];
+ keyDiversifyCryptoPro(ctx,keyExchangeKey,ukm,kek_ukm);
+ gost_key(ctx,kek_ukm);
+ memcpy(wrappedKey,ukm,8);
+ gost_enc(ctx,sessionKey,wrappedKey+8,4);
+ gost_mac_iv(ctx,32,ukm,sessionKey,32,wrappedKey+40);
+ return 1;
+ }
+/*
+ * Unwraps key using RFC 4357 6.4
+ * ctx - gost encryption context, initialized with some S-boxes
+ * keyExchangeKey 32-byte shared key
+ * wrappedKey 44 byte key to be unwrapped (concatenation of 8-byte UKM,
+ * 32 byte encrypted key and 4 byte MAC
+ *
+ * sessionKEy - 32byte buffer to store sessionKey in
+ * Returns 1 if key is decrypted successfully, and 0 if MAC doesn't match
+ */
+
+int keyUnwrapCryptoPro(gost_ctx *ctx,const unsigned char *keyExchangeKey,
+ const unsigned char *wrappedKey, unsigned char *sessionKey)
+ {
+ unsigned char kek_ukm[32],cek_mac[4];
+ keyDiversifyCryptoPro(ctx,keyExchangeKey,wrappedKey
+ /* First 8 bytes of wrapped Key is ukm */
+ ,kek_ukm);
+ gost_key(ctx,kek_ukm);
+ gost_dec(ctx,wrappedKey+8,sessionKey,4);
+ gost_mac_iv(ctx,32,wrappedKey,sessionKey,32,cek_mac);
+ if (memcmp(cek_mac,wrappedKey+40,4))
+ {
+ return 0;
+ }
+ return 1;
+ }
+
+