diff options
| author | Mark Purcell <msp@debian.org> | 2013-07-09 15:55:55 +0100 |
|---|---|---|
| committer | Mark Purcell <msp@debian.org> | 2013-07-09 15:55:55 +0100 |
| commit | 669109e369a1be69ff7c4108eb545eff4c5c26d9 (patch) | |
| tree | 73c117a2e7dd22a7a6ee315101f6357ab43386ec /srtp/crypto/skein.c | |
libzrtpcpp (2.3.4-1) unstable; urgency=medium
* New upstream release
- Fixes "CVE-2013-2221 CVE-2013-2222 CVE-2013-2223" (Closes: #714650)
# imported from the archive
Diffstat (limited to 'srtp/crypto/skein.c')
| -rw-r--r-- | srtp/crypto/skein.c | 742 |
1 files changed, 742 insertions, 0 deletions
diff --git a/srtp/crypto/skein.c b/srtp/crypto/skein.c new file mode 100644 index 0000000..5935a2a --- /dev/null +++ b/srtp/crypto/skein.c @@ -0,0 +1,742 @@ +/***********************************************************************
+**
+** Implementation of the Skein hash function.
+**
+** Source code author: Doug Whiting, 2008.
+**
+** This algorithm and source code is released to the public domain.
+**
+************************************************************************/
+
+#define SKEIN_PORT_CODE /* instantiate any code in skein_port.h */
+
+#include <string.h> /* get the memcpy/memset functions */
+#include <crypto/skein.h> /* get the Skein API definitions */
+#include <crypto/skein_iv.h> /* get precomputed IVs */
+
+/*****************************************************************/
+/* External function to process blkCnt (nonzero) full block(s) of data. */
+void Skein_256_Process_Block(Skein_256_Ctxt_t *ctx,const u08b_t *blkPtr,size_t blkCnt,size_t byteCntAdd);
+void Skein_512_Process_Block(Skein_512_Ctxt_t *ctx,const u08b_t *blkPtr,size_t blkCnt,size_t byteCntAdd);
+void Skein1024_Process_Block(Skein1024_Ctxt_t *ctx,const u08b_t *blkPtr,size_t blkCnt,size_t byteCntAdd);
+
+/*****************************************************************/
+/* 256-bit Skein */
+/*****************************************************************/
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a straight hashing operation */
+int Skein_256_Init(Skein_256_Ctxt_t *ctx, size_t hashBitLen)
+{
+ union
+ {
+ u08b_t b[SKEIN_256_STATE_BYTES];
+ u64b_t w[SKEIN_256_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0,SKEIN_BAD_HASHLEN);
+ ctx->h.hashBitLen = hashBitLen; /* output hash bit count */
+
+ switch (hashBitLen)
+ { /* use pre-computed values, where available */
+ case 256:
+ memcpy(ctx->X,SKEIN_256_IV_256,sizeof(ctx->X));
+ break;
+ case 224:
+ memcpy(ctx->X,SKEIN_256_IV_224,sizeof(ctx->X));
+ break;
+ case 160:
+ memcpy(ctx->X,SKEIN_256_IV_160,sizeof(ctx->X));
+ break;
+ case 128:
+ memcpy(ctx->X,SKEIN_256_IV_128,sizeof(ctx->X));
+ break;
+ default:
+ /* here if there is no precomputed IV value available */
+ /* build/process the config block, type == CONFIG (could be precomputed) */
+ Skein_Start_New_Type(ctx,CFG_FINAL); /* set tweaks: T0=0; T1=CFG | FINAL */
+
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER); /* set the schema, version */
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL);
+ memset(&cfg.w[3],0,sizeof(cfg) - 3*sizeof(cfg.w[0])); /* zero pad config block */
+
+ /* compute the initial chaining values from config block */
+ memset(ctx->X,0,sizeof(ctx->X)); /* zero the chaining variables */
+ Skein_256_Process_Block(ctx,cfg.b,1,SKEIN_CFG_STR_LEN);
+ break;
+ }
+ /* The chaining vars ctx->X are now initialized for the given hashBitLen. */
+ /* Set up to process the data message portion of the hash (default) */
+ Skein_Start_New_Type(ctx,MSG); /* T0=0, T1= MSG type */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a MAC and/or tree hash operation */
+/* [identical to Skein_256_Init() when keyBytes == 0 && treeInfo == SKEIN_CFG_TREE_INFO_SEQUENTIAL] */
+int Skein_256_InitExt(Skein_256_Ctxt_t *ctx,size_t hashBitLen,u64b_t treeInfo, const u08b_t *key, size_t keyBytes)
+{
+ union
+ {
+ u08b_t b[SKEIN_256_STATE_BYTES];
+ u64b_t w[SKEIN_256_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0,SKEIN_BAD_HASHLEN);
+ Skein_Assert(keyBytes == 0 || key != NULL,SKEIN_FAIL);
+
+ /* compute the initial chaining values ctx->X[], based on key */
+ if (keyBytes == 0) /* is there a key? */
+ {
+ memset(ctx->X,0,sizeof(ctx->X)); /* no key: use all zeroes as key for config block */
+ }
+ else /* here to pre-process a key */
+ {
+ Skein_assert(sizeof(cfg.b) >= sizeof(ctx->X));
+ /* do a mini-Init right here */
+ ctx->h.hashBitLen=8*sizeof(ctx->X); /* set output hash bit count = state size */
+ Skein_Start_New_Type(ctx,KEY); /* set tweaks: T0 = 0; T1 = KEY type */
+ memset(ctx->X,0,sizeof(ctx->X)); /* zero the initial chaining variables */
+ Skein_256_Update(ctx,key,keyBytes); /* hash the key */
+ Skein_256_Final_Pad(ctx,cfg.b); /* put result into cfg.b[] */
+ memcpy(ctx->X,cfg.b,sizeof(cfg.b)); /* copy over into ctx->X[] */
+#if SKEIN_NEED_SWAP
+ {
+ uint_t i;
+ for (i=0;i<SKEIN_256_STATE_WORDS;i++) /* convert key bytes to context words */
+ ctx->X[i] = Skein_Swap64(ctx->X[i]);
+ }
+#endif
+ }
+ /* build/process the config block, type == CONFIG (could be precomputed for each key) */
+ ctx->h.hashBitLen = hashBitLen; /* output hash bit count */
+ Skein_Start_New_Type(ctx,CFG_FINAL);
+
+ memset(&cfg.w,0,sizeof(cfg.w)); /* pre-pad cfg.w[] with zeroes */
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER);
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(treeInfo); /* tree hash config info (or SKEIN_CFG_TREE_INFO_SEQUENTIAL) */
+
+ Skein_Show_Key(256,&ctx->h,key,keyBytes);
+
+ /* compute the initial chaining values from config block */
+ Skein_256_Process_Block(ctx,cfg.b,1,SKEIN_CFG_STR_LEN);
+
+ /* The chaining vars ctx->X are now initialized */
+ /* Set up to process the data message portion of the hash (default) */
+ Skein_Start_New_Type(ctx,MSG);
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* process the input bytes */
+int Skein_256_Update(Skein_256_Ctxt_t *ctx, const u08b_t *msg, size_t msgByteCnt)
+{
+ size_t n;
+
+ Skein_Assert(ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ /* process full blocks, if any */
+ if (msgByteCnt + ctx->h.bCnt > SKEIN_256_BLOCK_BYTES)
+ {
+ if (ctx->h.bCnt) /* finish up any buffered message data */
+ {
+ n = SKEIN_256_BLOCK_BYTES - ctx->h.bCnt; /* # bytes free in buffer b[] */
+ if (n)
+ {
+ Skein_assert(n < msgByteCnt); /* check on our logic here */
+ memcpy(&ctx->b[ctx->h.bCnt],msg,n);
+ msgByteCnt -= n;
+ msg += n;
+ ctx->h.bCnt += n;
+ }
+ Skein_assert(ctx->h.bCnt == SKEIN_256_BLOCK_BYTES);
+ Skein_256_Process_Block(ctx,ctx->b,1,SKEIN_256_BLOCK_BYTES);
+ ctx->h.bCnt = 0;
+ }
+ /* now process any remaining full blocks, directly from input message data */
+ if (msgByteCnt > SKEIN_256_BLOCK_BYTES)
+ {
+ n = (msgByteCnt-1) / SKEIN_256_BLOCK_BYTES; /* number of full blocks to process */
+ Skein_256_Process_Block(ctx,msg,n,SKEIN_256_BLOCK_BYTES);
+ msgByteCnt -= n * SKEIN_256_BLOCK_BYTES;
+ msg += n * SKEIN_256_BLOCK_BYTES;
+ }
+ Skein_assert(ctx->h.bCnt == 0);
+ }
+
+ /* copy any remaining source message data bytes into b[] */
+ if (msgByteCnt)
+ {
+ Skein_assert(msgByteCnt + ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES);
+ memcpy(&ctx->b[ctx->h.bCnt],msg,msgByteCnt);
+ ctx->h.bCnt += msgByteCnt;
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the result */
+int Skein_256_Final(Skein_256_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ size_t i,n,byteCnt;
+ u64b_t X[SKEIN_256_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN_256_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt],0,SKEIN_256_BLOCK_BYTES - ctx->h.bCnt);
+
+ Skein_256_Process_Block(ctx,ctx->b,1,ctx->h.bCnt); /* process the final block */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b,0,sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X,ctx->X,sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i=0;i*SKEIN_256_BLOCK_BYTES < byteCnt;i++)
+ {
+ ((u64b_t *)ctx->b)[0]= Skein_Swap64((u64b_t) i); /* build the counter block */
+ Skein_Start_New_Type(ctx,OUT_FINAL);
+ Skein_256_Process_Block(ctx,ctx->b,1,sizeof(u64b_t)); /* run "counter mode" */
+ n = byteCnt - i*SKEIN_256_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN_256_BLOCK_BYTES)
+ n = SKEIN_256_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal+i*SKEIN_256_BLOCK_BYTES,ctx->X,n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(256,&ctx->h,n,hashVal+i*SKEIN_256_BLOCK_BYTES);
+ memcpy(ctx->X,X,sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+/*****************************************************************/
+/* 512-bit Skein */
+/*****************************************************************/
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a straight hashing operation */
+int Skein_512_Init(Skein_512_Ctxt_t *ctx, size_t hashBitLen)
+{
+ union
+ {
+ u08b_t b[SKEIN_512_STATE_BYTES];
+ u64b_t w[SKEIN_512_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0,SKEIN_BAD_HASHLEN);
+ ctx->h.hashBitLen = hashBitLen; /* output hash bit count */
+
+ switch (hashBitLen)
+ { /* use pre-computed values, where available */
+ case 512:
+ memcpy(ctx->X,SKEIN_512_IV_512,sizeof(ctx->X));
+ break;
+ case 384:
+ memcpy(ctx->X,SKEIN_512_IV_384,sizeof(ctx->X));
+ break;
+ case 256:
+ memcpy(ctx->X,SKEIN_512_IV_256,sizeof(ctx->X));
+ break;
+ case 224:
+ memcpy(ctx->X,SKEIN_512_IV_224,sizeof(ctx->X));
+ break;
+ default:
+ /* here if there is no precomputed IV value available */
+ /* build/process the config block, type == CONFIG (could be precomputed) */
+ Skein_Start_New_Type(ctx,CFG_FINAL); /* set tweaks: T0=0; T1=CFG | FINAL */
+
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER); /* set the schema, version */
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL);
+ memset(&cfg.w[3],0,sizeof(cfg) - 3*sizeof(cfg.w[0])); /* zero pad config block */
+
+ /* compute the initial chaining values from config block */
+ memset(ctx->X,0,sizeof(ctx->X)); /* zero the chaining variables */
+ Skein_512_Process_Block(ctx,cfg.b,1,SKEIN_CFG_STR_LEN);
+ break;
+ }
+
+ /* The chaining vars ctx->X are now initialized for the given hashBitLen. */
+ /* Set up to process the data message portion of the hash (default) */
+ Skein_Start_New_Type(ctx,MSG); /* T0=0, T1= MSG type */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a MAC and/or tree hash operation */
+/* [identical to Skein_512_Init() when keyBytes == 0 && treeInfo == SKEIN_CFG_TREE_INFO_SEQUENTIAL] */
+int Skein_512_InitExt(Skein_512_Ctxt_t *ctx,size_t hashBitLen,u64b_t treeInfo, const u08b_t *key, size_t keyBytes)
+{
+ union
+ {
+ u08b_t b[SKEIN_512_STATE_BYTES];
+ u64b_t w[SKEIN_512_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0,SKEIN_BAD_HASHLEN);
+ Skein_Assert(keyBytes == 0 || key != NULL,SKEIN_FAIL);
+
+ /* compute the initial chaining values ctx->X[], based on key */
+ if (keyBytes == 0) /* is there a key? */
+ {
+ memset(ctx->X,0,sizeof(ctx->X)); /* no key: use all zeroes as key for config block */
+ }
+ else /* here to pre-process a key */
+ {
+ Skein_assert(sizeof(cfg.b) >= sizeof(ctx->X));
+ /* do a mini-Init right here */
+ ctx->h.hashBitLen=8*sizeof(ctx->X); /* set output hash bit count = state size */
+ Skein_Start_New_Type(ctx,KEY); /* set tweaks: T0 = 0; T1 = KEY type */
+ memset(ctx->X,0,sizeof(ctx->X)); /* zero the initial chaining variables */
+ Skein_512_Update(ctx,key,keyBytes); /* hash the key */
+ Skein_512_Final_Pad(ctx,cfg.b); /* put result into cfg.b[] */
+ memcpy(ctx->X,cfg.b,sizeof(cfg.b)); /* copy over into ctx->X[] */
+#if SKEIN_NEED_SWAP
+ {
+ uint_t i;
+ for (i=0;i<SKEIN_512_STATE_WORDS;i++) /* convert key bytes to context words */
+ ctx->X[i] = Skein_Swap64(ctx->X[i]);
+ }
+#endif
+ }
+ /* build/process the config block, type == CONFIG (could be precomputed for each key) */
+ ctx->h.hashBitLen = hashBitLen; /* output hash bit count */
+ Skein_Start_New_Type(ctx,CFG_FINAL);
+
+ memset(&cfg.w,0,sizeof(cfg.w)); /* pre-pad cfg.w[] with zeroes */
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER);
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(treeInfo); /* tree hash config info (or SKEIN_CFG_TREE_INFO_SEQUENTIAL) */
+
+ Skein_Show_Key(512,&ctx->h,key,keyBytes);
+
+ /* compute the initial chaining values from config block */
+ Skein_512_Process_Block(ctx,cfg.b,1,SKEIN_CFG_STR_LEN);
+
+ /* The chaining vars ctx->X are now initialized */
+ /* Set up to process the data message portion of the hash (default) */
+ Skein_Start_New_Type(ctx,MSG);
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* process the input bytes */
+int Skein_512_Update(Skein_512_Ctxt_t *ctx, const u08b_t *msg, size_t msgByteCnt)
+{
+ size_t n;
+
+ Skein_Assert(ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ /* process full blocks, if any */
+ if (msgByteCnt + ctx->h.bCnt > SKEIN_512_BLOCK_BYTES)
+ {
+ if (ctx->h.bCnt) /* finish up any buffered message data */
+ {
+ n = SKEIN_512_BLOCK_BYTES - ctx->h.bCnt; /* # bytes free in buffer b[] */
+ if (n)
+ {
+ Skein_assert(n < msgByteCnt); /* check on our logic here */
+ memcpy(&ctx->b[ctx->h.bCnt],msg,n);
+ msgByteCnt -= n;
+ msg += n;
+ ctx->h.bCnt += n;
+ }
+ Skein_assert(ctx->h.bCnt == SKEIN_512_BLOCK_BYTES);
+ Skein_512_Process_Block(ctx,ctx->b,1,SKEIN_512_BLOCK_BYTES);
+ ctx->h.bCnt = 0;
+ }
+ /* now process any remaining full blocks, directly from input message data */
+ if (msgByteCnt > SKEIN_512_BLOCK_BYTES)
+ {
+ n = (msgByteCnt-1) / SKEIN_512_BLOCK_BYTES; /* number of full blocks to process */
+ Skein_512_Process_Block(ctx,msg,n,SKEIN_512_BLOCK_BYTES);
+ msgByteCnt -= n * SKEIN_512_BLOCK_BYTES;
+ msg += n * SKEIN_512_BLOCK_BYTES;
+ }
+ Skein_assert(ctx->h.bCnt == 0);
+ }
+
+ /* copy any remaining source message data bytes into b[] */
+ if (msgByteCnt)
+ {
+ Skein_assert(msgByteCnt + ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES);
+ memcpy(&ctx->b[ctx->h.bCnt],msg,msgByteCnt);
+ ctx->h.bCnt += msgByteCnt;
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the result */
+int Skein_512_Final(Skein_512_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ size_t i,n,byteCnt;
+ u64b_t X[SKEIN_512_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN_512_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt],0,SKEIN_512_BLOCK_BYTES - ctx->h.bCnt);
+
+ Skein_512_Process_Block(ctx,ctx->b,1,ctx->h.bCnt); /* process the final block */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b,0,sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X,ctx->X,sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i=0;i*SKEIN_512_BLOCK_BYTES < byteCnt;i++)
+ {
+ ((u64b_t *)ctx->b)[0]= Skein_Swap64((u64b_t) i); /* build the counter block */
+ Skein_Start_New_Type(ctx,OUT_FINAL);
+ Skein_512_Process_Block(ctx,ctx->b,1,sizeof(u64b_t)); /* run "counter mode" */
+ n = byteCnt - i*SKEIN_512_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN_512_BLOCK_BYTES)
+ n = SKEIN_512_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal+i*SKEIN_512_BLOCK_BYTES,ctx->X,n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(512,&ctx->h,n,hashVal+i*SKEIN_512_BLOCK_BYTES);
+ memcpy(ctx->X,X,sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+/*****************************************************************/
+/* 1024-bit Skein */
+/*****************************************************************/
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a straight hashing operation */
+int Skein1024_Init(Skein1024_Ctxt_t *ctx, size_t hashBitLen)
+{
+ union
+ {
+ u08b_t b[SKEIN1024_STATE_BYTES];
+ u64b_t w[SKEIN1024_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0,SKEIN_BAD_HASHLEN);
+ ctx->h.hashBitLen = hashBitLen; /* output hash bit count */
+
+ switch (hashBitLen)
+ { /* use pre-computed values, where available */
+ case 512:
+ memcpy(ctx->X,SKEIN1024_IV_512 ,sizeof(ctx->X));
+ break;
+ case 384:
+ memcpy(ctx->X,SKEIN1024_IV_384 ,sizeof(ctx->X));
+ break;
+ case 1024:
+ memcpy(ctx->X,SKEIN1024_IV_1024,sizeof(ctx->X));
+ break;
+ default:
+ /* here if there is no precomputed IV value available */
+ /* build/process the config block, type == CONFIG (could be precomputed) */
+ Skein_Start_New_Type(ctx,CFG_FINAL); /* set tweaks: T0=0; T1=CFG | FINAL */
+
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER); /* set the schema, version */
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL);
+ memset(&cfg.w[3],0,sizeof(cfg) - 3*sizeof(cfg.w[0])); /* zero pad config block */
+
+ /* compute the initial chaining values from config block */
+ memset(ctx->X,0,sizeof(ctx->X)); /* zero the chaining variables */
+ Skein1024_Process_Block(ctx,cfg.b,1,SKEIN_CFG_STR_LEN);
+ break;
+ }
+
+ /* The chaining vars ctx->X are now initialized for the given hashBitLen. */
+ /* Set up to process the data message portion of the hash (default) */
+ Skein_Start_New_Type(ctx,MSG); /* T0=0, T1= MSG type */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a MAC and/or tree hash operation */
+/* [identical to Skein1024_Init() when keyBytes == 0 && treeInfo == SKEIN_CFG_TREE_INFO_SEQUENTIAL] */
+int Skein1024_InitExt(Skein1024_Ctxt_t *ctx,size_t hashBitLen,u64b_t treeInfo, const u08b_t *key, size_t keyBytes)
+{
+ union
+ {
+ u08b_t b[SKEIN1024_STATE_BYTES];
+ u64b_t w[SKEIN1024_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0,SKEIN_BAD_HASHLEN);
+ Skein_Assert(keyBytes == 0 || key != NULL,SKEIN_FAIL);
+
+ /* compute the initial chaining values ctx->X[], based on key */
+ if (keyBytes == 0) /* is there a key? */
+ {
+ memset(ctx->X,0,sizeof(ctx->X)); /* no key: use all zeroes as key for config block */
+ }
+ else /* here to pre-process a key */
+ {
+ Skein_assert(sizeof(cfg.b) >= sizeof(ctx->X));
+ /* do a mini-Init right here */
+ ctx->h.hashBitLen=8*sizeof(ctx->X); /* set output hash bit count = state size */
+ Skein_Start_New_Type(ctx,KEY); /* set tweaks: T0 = 0; T1 = KEY type */
+ memset(ctx->X,0,sizeof(ctx->X)); /* zero the initial chaining variables */
+ Skein1024_Update(ctx,key,keyBytes); /* hash the key */
+ Skein1024_Final_Pad(ctx,cfg.b); /* put result into cfg.b[] */
+ memcpy(ctx->X,cfg.b,sizeof(cfg.b)); /* copy over into ctx->X[] */
+#if SKEIN_NEED_SWAP
+ {
+ uint_t i;
+ for (i=0;i<SKEIN1024_STATE_WORDS;i++) /* convert key bytes to context words */
+ ctx->X[i] = Skein_Swap64(ctx->X[i]);
+ }
+#endif
+ }
+ /* build/process the config block, type == CONFIG (could be precomputed for each key) */
+ ctx->h.hashBitLen = hashBitLen; /* output hash bit count */
+ Skein_Start_New_Type(ctx,CFG_FINAL);
+
+ memset(&cfg.w,0,sizeof(cfg.w)); /* pre-pad cfg.w[] with zeroes */
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER);
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(treeInfo); /* tree hash config info (or SKEIN_CFG_TREE_INFO_SEQUENTIAL) */
+
+ Skein_Show_Key(1024,&ctx->h,key,keyBytes);
+
+ /* compute the initial chaining values from config block */
+ Skein1024_Process_Block(ctx,cfg.b,1,SKEIN_CFG_STR_LEN);
+
+ /* The chaining vars ctx->X are now initialized */
+ /* Set up to process the data message portion of the hash (default) */
+ Skein_Start_New_Type(ctx,MSG);
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* process the input bytes */
+int Skein1024_Update(Skein1024_Ctxt_t *ctx, const u08b_t *msg, size_t msgByteCnt)
+{
+ size_t n;
+
+ Skein_Assert(ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ /* process full blocks, if any */
+ if (msgByteCnt + ctx->h.bCnt > SKEIN1024_BLOCK_BYTES)
+ {
+ if (ctx->h.bCnt) /* finish up any buffered message data */
+ {
+ n = SKEIN1024_BLOCK_BYTES - ctx->h.bCnt; /* # bytes free in buffer b[] */
+ if (n)
+ {
+ Skein_assert(n < msgByteCnt); /* check on our logic here */
+ memcpy(&ctx->b[ctx->h.bCnt],msg,n);
+ msgByteCnt -= n;
+ msg += n;
+ ctx->h.bCnt += n;
+ }
+ Skein_assert(ctx->h.bCnt == SKEIN1024_BLOCK_BYTES);
+ Skein1024_Process_Block(ctx,ctx->b,1,SKEIN1024_BLOCK_BYTES);
+ ctx->h.bCnt = 0;
+ }
+ /* now process any remaining full blocks, directly from input message data */
+ if (msgByteCnt > SKEIN1024_BLOCK_BYTES)
+ {
+ n = (msgByteCnt-1) / SKEIN1024_BLOCK_BYTES; /* number of full blocks to process */
+ Skein1024_Process_Block(ctx,msg,n,SKEIN1024_BLOCK_BYTES);
+ msgByteCnt -= n * SKEIN1024_BLOCK_BYTES;
+ msg += n * SKEIN1024_BLOCK_BYTES;
+ }
+ Skein_assert(ctx->h.bCnt == 0);
+ }
+
+ /* copy any remaining source message data bytes into b[] */
+ if (msgByteCnt)
+ {
+ Skein_assert(msgByteCnt + ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES);
+ memcpy(&ctx->b[ctx->h.bCnt],msg,msgByteCnt);
+ ctx->h.bCnt += msgByteCnt;
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the result */
+int Skein1024_Final(Skein1024_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ size_t i,n,byteCnt;
+ u64b_t X[SKEIN1024_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN1024_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt],0,SKEIN1024_BLOCK_BYTES - ctx->h.bCnt);
+
+ Skein1024_Process_Block(ctx,ctx->b,1,ctx->h.bCnt); /* process the final block */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b,0,sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X,ctx->X,sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i=0;i*SKEIN1024_BLOCK_BYTES < byteCnt;i++)
+ {
+ ((u64b_t *)ctx->b)[0]= Skein_Swap64((u64b_t) i); /* build the counter block */
+ Skein_Start_New_Type(ctx,OUT_FINAL);
+ Skein1024_Process_Block(ctx,ctx->b,1,sizeof(u64b_t)); /* run "counter mode" */
+ n = byteCnt - i*SKEIN1024_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN1024_BLOCK_BYTES)
+ n = SKEIN1024_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal+i*SKEIN1024_BLOCK_BYTES,ctx->X,n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(1024,&ctx->h,n,hashVal+i*SKEIN1024_BLOCK_BYTES);
+ memcpy(ctx->X,X,sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+/**************** Functions to support MAC/tree hashing ***************/
+/* (this code is identical for Optimized and Reference versions) */
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the block, no OUTPUT stage */
+int Skein_256_Final_Pad(Skein_256_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ Skein_Assert(ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN_256_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt],0,SKEIN_256_BLOCK_BYTES - ctx->h.bCnt);
+ Skein_256_Process_Block(ctx,ctx->b,1,ctx->h.bCnt); /* process the final block */
+
+ Skein_Put64_LSB_First(hashVal,ctx->X,SKEIN_256_BLOCK_BYTES); /* "output" the state bytes */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the block, no OUTPUT stage */
+int Skein_512_Final_Pad(Skein_512_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ Skein_Assert(ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN_512_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt],0,SKEIN_512_BLOCK_BYTES - ctx->h.bCnt);
+ Skein_512_Process_Block(ctx,ctx->b,1,ctx->h.bCnt); /* process the final block */
+
+ Skein_Put64_LSB_First(hashVal,ctx->X,SKEIN_512_BLOCK_BYTES); /* "output" the state bytes */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the block, no OUTPUT stage */
+int Skein1024_Final_Pad(Skein1024_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ Skein_Assert(ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN1024_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt],0,SKEIN1024_BLOCK_BYTES - ctx->h.bCnt);
+ Skein1024_Process_Block(ctx,ctx->b,1,ctx->h.bCnt); /* process the final block */
+
+ Skein_Put64_LSB_First(hashVal,ctx->X,SKEIN1024_BLOCK_BYTES); /* "output" the state bytes */
+
+ return SKEIN_SUCCESS;
+}
+
+#if SKEIN_TREE_HASH
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* just do the OUTPUT stage */
+int Skein_256_Output(Skein_256_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ size_t i,n,byteCnt;
+ u64b_t X[SKEIN_256_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b,0,sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X,ctx->X,sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i=0;i*SKEIN_256_BLOCK_BYTES < byteCnt;i++)
+ {
+ ((u64b_t *)ctx->b)[0]= Skein_Swap64((u64b_t) i); /* build the counter block */
+ Skein_Start_New_Type(ctx,OUT_FINAL);
+ Skein_256_Process_Block(ctx,ctx->b,1,sizeof(u64b_t)); /* run "counter mode" */
+ n = byteCnt - i*SKEIN_256_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN_256_BLOCK_BYTES)
+ n = SKEIN_256_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal+i*SKEIN_256_BLOCK_BYTES,ctx->X,n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(256,&ctx->h,n,hashVal+i*SKEIN_256_BLOCK_BYTES);
+ memcpy(ctx->X,X,sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* just do the OUTPUT stage */
+int Skein_512_Output(Skein_512_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ size_t i,n,byteCnt;
+ u64b_t X[SKEIN_512_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b,0,sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X,ctx->X,sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i=0;i*SKEIN_512_BLOCK_BYTES < byteCnt;i++)
+ {
+ ((u64b_t *)ctx->b)[0]= Skein_Swap64((u64b_t) i); /* build the counter block */
+ Skein_Start_New_Type(ctx,OUT_FINAL);
+ Skein_512_Process_Block(ctx,ctx->b,1,sizeof(u64b_t)); /* run "counter mode" */
+ n = byteCnt - i*SKEIN_512_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN_512_BLOCK_BYTES)
+ n = SKEIN_512_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal+i*SKEIN_512_BLOCK_BYTES,ctx->X,n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(256,&ctx->h,n,hashVal+i*SKEIN_512_BLOCK_BYTES);
+ memcpy(ctx->X,X,sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* just do the OUTPUT stage */
+int Skein1024_Output(Skein1024_Ctxt_t *ctx, u08b_t *hashVal)
+{
+ size_t i,n,byteCnt;
+ u64b_t X[SKEIN1024_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES,SKEIN_FAIL); /* catch uninitialized context */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b,0,sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X,ctx->X,sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i=0;i*SKEIN1024_BLOCK_BYTES < byteCnt;i++)
+ {
+ ((u64b_t *)ctx->b)[0]= Skein_Swap64((u64b_t) i); /* build the counter block */
+ Skein_Start_New_Type(ctx,OUT_FINAL);
+ Skein1024_Process_Block(ctx,ctx->b,1,sizeof(u64b_t)); /* run "counter mode" */
+ n = byteCnt - i*SKEIN1024_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN1024_BLOCK_BYTES)
+ n = SKEIN1024_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal+i*SKEIN1024_BLOCK_BYTES,ctx->X,n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(256,&ctx->h,n,hashVal+i*SKEIN1024_BLOCK_BYTES);
+ memcpy(ctx->X,X,sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+#endif
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