diff options
Diffstat (limited to 'drivers/staging/skein/skein_base.c')
| -rw-r--r-- | drivers/staging/skein/skein_base.c | 864 |
1 files changed, 864 insertions, 0 deletions
diff --git a/drivers/staging/skein/skein_base.c b/drivers/staging/skein/skein_base.c new file mode 100644 index 000000000000..7e700a6b5788 --- /dev/null +++ b/drivers/staging/skein/skein_base.c @@ -0,0 +1,864 @@ +/*********************************************************************** +** +** Implementation of the Skein hash function. +** +** Source code author: Doug Whiting, 2008. +** +** This algorithm and source code is released to the public domain. +** +************************************************************************/ + +#include <linux/string.h> /* get the memcpy/memset functions */ +#include <linux/export.h> +#include "skein_base.h" /* get the Skein API definitions */ +#include "skein_iv.h" /* get precomputed IVs */ +#include "skein_block.h" + +/*****************************************************************/ +/* 256-bit Skein */ +/*****************************************************************/ + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* init the context for a straight hashing operation */ +int skein_256_init(struct skein_256_ctx *ctx, size_t hash_bit_len) +{ + union { + u8 b[SKEIN_256_STATE_BYTES]; + u64 w[SKEIN_256_STATE_WORDS]; + } cfg; /* config block */ + + skein_assert_ret(hash_bit_len > 0, SKEIN_BAD_HASHLEN); + ctx->h.hash_bit_len = hash_bit_len; /* output hash bit count */ + + switch (hash_bit_len) { /* 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) + */ + /* set tweaks: T0=0; T1=CFG | FINAL */ + skein_start_new_type(ctx, CFG_FINAL); + + /* set the schema, version */ + cfg.w[0] = skein_swap64(SKEIN_SCHEMA_VER); + /* hash result length in bits */ + cfg.w[1] = skein_swap64(hash_bit_len); + cfg.w[2] = skein_swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL); + /* zero pad config block */ + memset(&cfg.w[3], 0, sizeof(cfg) - 3*sizeof(cfg.w[0])); + + /* compute the initial chaining values from config block */ + /* zero the chaining variables */ + memset(ctx->x, 0, sizeof(ctx->x)); + skein_256_process_block(ctx, cfg.b, 1, SKEIN_CFG_STR_LEN); + break; + } + /* The chaining vars ctx->x are now initialized for hash_bit_len. */ + /* 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 key_bytes == 0 && \ + * tree_info == SKEIN_CFG_TREE_INFO_SEQUENTIAL] */ +int skein_256_init_ext(struct skein_256_ctx *ctx, size_t hash_bit_len, + u64 tree_info, const u8 *key, size_t key_bytes) +{ + union { + u8 b[SKEIN_256_STATE_BYTES]; + u64 w[SKEIN_256_STATE_WORDS]; + } cfg; /* config block */ + + skein_assert_ret(hash_bit_len > 0, SKEIN_BAD_HASHLEN); + skein_assert_ret(key_bytes == 0 || key != NULL, SKEIN_FAIL); + + /* compute the initial chaining values ctx->x[], based on key */ + if (key_bytes == 0) { /* is there a key? */ + /* no key: use all zeroes as key for config block */ + memset(ctx->x, 0, sizeof(ctx->x)); + } else { /* here to pre-process a key */ + skein_assert(sizeof(cfg.b) >= sizeof(ctx->x)); + /* do a mini-Init right here */ + /* set output hash bit count = state size */ + ctx->h.hash_bit_len = 8*sizeof(ctx->x); + /* set tweaks: T0 = 0; T1 = KEY type */ + skein_start_new_type(ctx, KEY); + /* zero the initial chaining variables */ + memset(ctx->x, 0, sizeof(ctx->x)); + /* hash the key */ + skein_256_update(ctx, key, key_bytes); + /* put result into cfg.b[] */ + skein_256_final_pad(ctx, cfg.b); + /* copy over into ctx->x[] */ + memcpy(ctx->x, cfg.b, sizeof(cfg.b)); + } + /* + * build/process the config block, type == CONFIG (could be + * precomputed for each key) + */ + /* output hash bit count */ + ctx->h.hash_bit_len = hash_bit_len; + skein_start_new_type(ctx, CFG_FINAL); + + /* pre-pad cfg.w[] with zeroes */ + memset(&cfg.w, 0, sizeof(cfg.w)); + cfg.w[0] = skein_swap64(SKEIN_SCHEMA_VER); + /* hash result length in bits */ + cfg.w[1] = skein_swap64(hash_bit_len); + /* tree hash config info (or SKEIN_CFG_TREE_INFO_SEQUENTIAL) */ + cfg.w[2] = skein_swap64(tree_info); + + /* 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(struct skein_256_ctx *ctx, const u8 *msg, + size_t msg_byte_cnt) +{ + size_t n; + + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_256_BLOCK_BYTES, SKEIN_FAIL); + + /* process full blocks, if any */ + if (msg_byte_cnt + ctx->h.b_cnt > SKEIN_256_BLOCK_BYTES) { + /* finish up any buffered message data */ + if (ctx->h.b_cnt) { + /* # bytes free in buffer b[] */ + n = SKEIN_256_BLOCK_BYTES - ctx->h.b_cnt; + if (n) { + /* check on our logic here */ + skein_assert(n < msg_byte_cnt); + memcpy(&ctx->b[ctx->h.b_cnt], msg, n); + msg_byte_cnt -= n; + msg += n; + ctx->h.b_cnt += n; + } + skein_assert(ctx->h.b_cnt == SKEIN_256_BLOCK_BYTES); + skein_256_process_block(ctx, ctx->b, 1, + SKEIN_256_BLOCK_BYTES); + ctx->h.b_cnt = 0; + } + /* + * now process any remaining full blocks, directly from input + * message data + */ + if (msg_byte_cnt > SKEIN_256_BLOCK_BYTES) { + /* number of full blocks to process */ + n = (msg_byte_cnt-1) / SKEIN_256_BLOCK_BYTES; + skein_256_process_block(ctx, msg, n, + SKEIN_256_BLOCK_BYTES); + msg_byte_cnt -= n * SKEIN_256_BLOCK_BYTES; + msg += n * SKEIN_256_BLOCK_BYTES; + } + skein_assert(ctx->h.b_cnt == 0); + } + + /* copy any remaining source message data bytes into b[] */ + if (msg_byte_cnt) { + skein_assert(msg_byte_cnt + ctx->h.b_cnt <= + SKEIN_256_BLOCK_BYTES); + memcpy(&ctx->b[ctx->h.b_cnt], msg, msg_byte_cnt); + ctx->h.b_cnt += msg_byte_cnt; + } + + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* finalize the hash computation and output the result */ +int skein_256_final(struct skein_256_ctx *ctx, u8 *hash_val) +{ + size_t i, n, byte_cnt; + u64 x[SKEIN_256_STATE_WORDS]; + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_256_BLOCK_BYTES, SKEIN_FAIL); + + /* tag as the final block */ + ctx->h.tweak[1] |= SKEIN_T1_FLAG_FINAL; + /* zero pad b[] if necessary */ + if (ctx->h.b_cnt < SKEIN_256_BLOCK_BYTES) + memset(&ctx->b[ctx->h.b_cnt], 0, + SKEIN_256_BLOCK_BYTES - ctx->h.b_cnt); + + /* process the final block */ + skein_256_process_block(ctx, ctx->b, 1, ctx->h.b_cnt); + + /* now output the result */ + /* total number of output bytes */ + byte_cnt = (ctx->h.hash_bit_len + 7) >> 3; + + /* run Threefish in "counter mode" to generate output */ + /* zero out b[], so it can hold the counter */ + memset(ctx->b, 0, sizeof(ctx->b)); + /* keep a local copy of counter mode "key" */ + memcpy(x, ctx->x, sizeof(x)); + for (i = 0; i*SKEIN_256_BLOCK_BYTES < byte_cnt; i++) { + /* build the counter block */ + ((u64 *)ctx->b)[0] = skein_swap64((u64) i); + skein_start_new_type(ctx, OUT_FINAL); + /* run "counter mode" */ + skein_256_process_block(ctx, ctx->b, 1, sizeof(u64)); + /* number of output bytes left to go */ + n = byte_cnt - i*SKEIN_256_BLOCK_BYTES; + if (n >= SKEIN_256_BLOCK_BYTES) + n = SKEIN_256_BLOCK_BYTES; + /* "output" the ctr mode bytes */ + skein_put64_lsb_first(hash_val+i*SKEIN_256_BLOCK_BYTES, ctx->x, + n); + /* restore the counter mode key for next time */ + memcpy(ctx->x, x, sizeof(x)); + } + return SKEIN_SUCCESS; +} + +/*****************************************************************/ +/* 512-bit Skein */ +/*****************************************************************/ + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* init the context for a straight hashing operation */ +int skein_512_init(struct skein_512_ctx *ctx, size_t hash_bit_len) +{ + union { + u8 b[SKEIN_512_STATE_BYTES]; + u64 w[SKEIN_512_STATE_WORDS]; + } cfg; /* config block */ + + skein_assert_ret(hash_bit_len > 0, SKEIN_BAD_HASHLEN); + ctx->h.hash_bit_len = hash_bit_len; /* output hash bit count */ + + switch (hash_bit_len) { /* 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) + */ + /* set tweaks: T0=0; T1=CFG | FINAL */ + skein_start_new_type(ctx, CFG_FINAL); + + /* set the schema, version */ + cfg.w[0] = skein_swap64(SKEIN_SCHEMA_VER); + /* hash result length in bits */ + cfg.w[1] = skein_swap64(hash_bit_len); + cfg.w[2] = skein_swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL); + /* zero pad config block */ + memset(&cfg.w[3], 0, sizeof(cfg) - 3*sizeof(cfg.w[0])); + + /* compute the initial chaining values from config block */ + /* zero the chaining variables */ + memset(ctx->x, 0, sizeof(ctx->x)); + skein_512_process_block(ctx, cfg.b, 1, SKEIN_CFG_STR_LEN); + break; + } + + /* + * The chaining vars ctx->x are now initialized for the given + * hash_bit_len. + */ + /* 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 key_bytes == 0 && \ + * tree_info == SKEIN_CFG_TREE_INFO_SEQUENTIAL] */ +int skein_512_init_ext(struct skein_512_ctx *ctx, size_t hash_bit_len, + u64 tree_info, const u8 *key, size_t key_bytes) +{ + union { + u8 b[SKEIN_512_STATE_BYTES]; + u64 w[SKEIN_512_STATE_WORDS]; + } cfg; /* config block */ + + skein_assert_ret(hash_bit_len > 0, SKEIN_BAD_HASHLEN); + skein_assert_ret(key_bytes == 0 || key != NULL, SKEIN_FAIL); + + /* compute the initial chaining values ctx->x[], based on key */ + if (key_bytes == 0) { /* is there a key? */ + /* no key: use all zeroes as key for config block */ + memset(ctx->x, 0, sizeof(ctx->x)); + } else { /* here to pre-process a key */ + skein_assert(sizeof(cfg.b) >= sizeof(ctx->x)); + /* do a mini-Init right here */ + /* set output hash bit count = state size */ + ctx->h.hash_bit_len = 8*sizeof(ctx->x); + /* set tweaks: T0 = 0; T1 = KEY type */ + skein_start_new_type(ctx, KEY); + /* zero the initial chaining variables */ + memset(ctx->x, 0, sizeof(ctx->x)); + /* hash the key */ + skein_512_update(ctx, key, key_bytes); + /* put result into cfg.b[] */ + skein_512_final_pad(ctx, cfg.b); + /* copy over into ctx->x[] */ + memcpy(ctx->x, cfg.b, sizeof(cfg.b)); + } + /* + * build/process the config block, type == CONFIG (could be + * precomputed for each key) + */ + ctx->h.hash_bit_len = hash_bit_len; /* output hash bit count */ + skein_start_new_type(ctx, CFG_FINAL); + + /* pre-pad cfg.w[] with zeroes */ + memset(&cfg.w, 0, sizeof(cfg.w)); + cfg.w[0] = skein_swap64(SKEIN_SCHEMA_VER); + /* hash result length in bits */ + cfg.w[1] = skein_swap64(hash_bit_len); + /* tree hash config info (or SKEIN_CFG_TREE_INFO_SEQUENTIAL) */ + cfg.w[2] = skein_swap64(tree_info); + + /* 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(struct skein_512_ctx *ctx, const u8 *msg, + size_t msg_byte_cnt) +{ + size_t n; + + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_512_BLOCK_BYTES, SKEIN_FAIL); + + /* process full blocks, if any */ + if (msg_byte_cnt + ctx->h.b_cnt > SKEIN_512_BLOCK_BYTES) { + /* finish up any buffered message data */ + if (ctx->h.b_cnt) { + /* # bytes free in buffer b[] */ + n = SKEIN_512_BLOCK_BYTES - ctx->h.b_cnt; + if (n) { + /* check on our logic here */ + skein_assert(n < msg_byte_cnt); + memcpy(&ctx->b[ctx->h.b_cnt], msg, n); + msg_byte_cnt -= n; + msg += n; + ctx->h.b_cnt += n; + } + skein_assert(ctx->h.b_cnt == SKEIN_512_BLOCK_BYTES); + skein_512_process_block(ctx, ctx->b, 1, + SKEIN_512_BLOCK_BYTES); + ctx->h.b_cnt = 0; + } + /* + * now process any remaining full blocks, directly from input + * message data + */ + if (msg_byte_cnt > SKEIN_512_BLOCK_BYTES) { + /* number of full blocks to process */ + n = (msg_byte_cnt-1) / SKEIN_512_BLOCK_BYTES; + skein_512_process_block(ctx, msg, n, + SKEIN_512_BLOCK_BYTES); + msg_byte_cnt -= n * SKEIN_512_BLOCK_BYTES; + msg += n * SKEIN_512_BLOCK_BYTES; + } + skein_assert(ctx->h.b_cnt == 0); + } + + /* copy any remaining source message data bytes into b[] */ + if (msg_byte_cnt) { + skein_assert(msg_byte_cnt + ctx->h.b_cnt <= + SKEIN_512_BLOCK_BYTES); + memcpy(&ctx->b[ctx->h.b_cnt], msg, msg_byte_cnt); + ctx->h.b_cnt += msg_byte_cnt; + } + + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* finalize the hash computation and output the result */ +int skein_512_final(struct skein_512_ctx *ctx, u8 *hash_val) +{ + size_t i, n, byte_cnt; + u64 x[SKEIN_512_STATE_WORDS]; + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_512_BLOCK_BYTES, SKEIN_FAIL); + + /* tag as the final block */ + ctx->h.tweak[1] |= SKEIN_T1_FLAG_FINAL; + /* zero pad b[] if necessary */ + if (ctx->h.b_cnt < SKEIN_512_BLOCK_BYTES) + memset(&ctx->b[ctx->h.b_cnt], 0, + SKEIN_512_BLOCK_BYTES - ctx->h.b_cnt); + + /* process the final block */ + skein_512_process_block(ctx, ctx->b, 1, ctx->h.b_cnt); + + /* now output the result */ + /* total number of output bytes */ + byte_cnt = (ctx->h.hash_bit_len + 7) >> 3; + + /* run Threefish in "counter mode" to generate output */ + /* zero out b[], so it can hold the counter */ + memset(ctx->b, 0, sizeof(ctx->b)); + /* keep a local copy of counter mode "key" */ + memcpy(x, ctx->x, sizeof(x)); + for (i = 0; i*SKEIN_512_BLOCK_BYTES < byte_cnt; i++) { + /* build the counter block */ + ((u64 *)ctx->b)[0] = skein_swap64((u64) i); + skein_start_new_type(ctx, OUT_FINAL); + /* run "counter mode" */ + skein_512_process_block(ctx, ctx->b, 1, sizeof(u64)); + /* number of output bytes left to go */ + n = byte_cnt - i*SKEIN_512_BLOCK_BYTES; + if (n >= SKEIN_512_BLOCK_BYTES) + n = SKEIN_512_BLOCK_BYTES; + /* "output" the ctr mode bytes */ + skein_put64_lsb_first(hash_val+i*SKEIN_512_BLOCK_BYTES, ctx->x, + n); + /* restore the counter mode key for next time */ + memcpy(ctx->x, x, sizeof(x)); + } + return SKEIN_SUCCESS; +} + +/*****************************************************************/ +/* 1024-bit Skein */ +/*****************************************************************/ + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* init the context for a straight hashing operation */ +int skein_1024_init(struct skein_1024_ctx *ctx, size_t hash_bit_len) +{ + union { + u8 b[SKEIN_1024_STATE_BYTES]; + u64 w[SKEIN_1024_STATE_WORDS]; + } cfg; /* config block */ + + skein_assert_ret(hash_bit_len > 0, SKEIN_BAD_HASHLEN); + ctx->h.hash_bit_len = hash_bit_len; /* output hash bit count */ + + switch (hash_bit_len) { /* use pre-computed values, where available */ + case 512: + memcpy(ctx->x, SKEIN_1024_IV_512, sizeof(ctx->x)); + break; + case 384: + memcpy(ctx->x, SKEIN_1024_IV_384, sizeof(ctx->x)); + break; + case 1024: + memcpy(ctx->x, SKEIN_1024_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) + */ + /* set tweaks: T0=0; T1=CFG | FINAL */ + skein_start_new_type(ctx, CFG_FINAL); + + /* set the schema, version */ + cfg.w[0] = skein_swap64(SKEIN_SCHEMA_VER); + /* hash result length in bits */ + cfg.w[1] = skein_swap64(hash_bit_len); + cfg.w[2] = skein_swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL); + /* zero pad config block */ + memset(&cfg.w[3], 0, sizeof(cfg) - 3*sizeof(cfg.w[0])); + + /* compute the initial chaining values from config block */ + /* zero the chaining variables */ + memset(ctx->x, 0, sizeof(ctx->x)); + skein_1024_process_block(ctx, cfg.b, 1, SKEIN_CFG_STR_LEN); + break; + } + + /* The chaining vars ctx->x are now initialized for the hash_bit_len. */ + /* 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_1024_init() when key_bytes == 0 && \ + * tree_info == SKEIN_CFG_TREE_INFO_SEQUENTIAL] */ +int skein_1024_init_ext(struct skein_1024_ctx *ctx, size_t hash_bit_len, + u64 tree_info, const u8 *key, size_t key_bytes) +{ + union { + u8 b[SKEIN_1024_STATE_BYTES]; + u64 w[SKEIN_1024_STATE_WORDS]; + } cfg; /* config block */ + + skein_assert_ret(hash_bit_len > 0, SKEIN_BAD_HASHLEN); + skein_assert_ret(key_bytes == 0 || key != NULL, SKEIN_FAIL); + + /* compute the initial chaining values ctx->x[], based on key */ + if (key_bytes == 0) { /* is there a key? */ + /* no key: use all zeroes as key for config block */ + memset(ctx->x, 0, sizeof(ctx->x)); + } else { /* here to pre-process a key */ + skein_assert(sizeof(cfg.b) >= sizeof(ctx->x)); + /* do a mini-Init right here */ + /* set output hash bit count = state size */ + ctx->h.hash_bit_len = 8*sizeof(ctx->x); + /* set tweaks: T0 = 0; T1 = KEY type */ + skein_start_new_type(ctx, KEY); + /* zero the initial chaining variables */ + memset(ctx->x, 0, sizeof(ctx->x)); + /* hash the key */ + skein_1024_update(ctx, key, key_bytes); + /* put result into cfg.b[] */ + skein_1024_final_pad(ctx, cfg.b); + /* copy over into ctx->x[] */ + memcpy(ctx->x, cfg.b, sizeof(cfg.b)); + } + /* + * build/process the config block, type == CONFIG (could be + * precomputed for each key) + */ + /* output hash bit count */ + ctx->h.hash_bit_len = hash_bit_len; + skein_start_new_type(ctx, CFG_FINAL); + + /* pre-pad cfg.w[] with zeroes */ + memset(&cfg.w, 0, sizeof(cfg.w)); + cfg.w[0] = skein_swap64(SKEIN_SCHEMA_VER); + /* hash result length in bits */ + cfg.w[1] = skein_swap64(hash_bit_len); + /* tree hash config info (or SKEIN_CFG_TREE_INFO_SEQUENTIAL) */ + cfg.w[2] = skein_swap64(tree_info); + + /* compute the initial chaining values from config block */ + skein_1024_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_1024_update(struct skein_1024_ctx *ctx, const u8 *msg, + size_t msg_byte_cnt) +{ + size_t n; + + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_1024_BLOCK_BYTES, SKEIN_FAIL); + + /* process full blocks, if any */ + if (msg_byte_cnt + ctx->h.b_cnt > SKEIN_1024_BLOCK_BYTES) { + /* finish up any buffered message data */ + if (ctx->h.b_cnt) { + /* # bytes free in buffer b[] */ + n = SKEIN_1024_BLOCK_BYTES - ctx->h.b_cnt; + if (n) { + /* check on our logic here */ + skein_assert(n < msg_byte_cnt); + memcpy(&ctx->b[ctx->h.b_cnt], msg, n); + msg_byte_cnt -= n; + msg += n; + ctx->h.b_cnt += n; + } + skein_assert(ctx->h.b_cnt == SKEIN_1024_BLOCK_BYTES); + skein_1024_process_block(ctx, ctx->b, 1, + SKEIN_1024_BLOCK_BYTES); + ctx->h.b_cnt = 0; + } + /* + * now process any remaining full blocks, directly from input + * message data + */ + if (msg_byte_cnt > SKEIN_1024_BLOCK_BYTES) { + /* number of full blocks to process */ + n = (msg_byte_cnt-1) / SKEIN_1024_BLOCK_BYTES; + skein_1024_process_block(ctx, msg, n, + SKEIN_1024_BLOCK_BYTES); + msg_byte_cnt -= n * SKEIN_1024_BLOCK_BYTES; + msg += n * SKEIN_1024_BLOCK_BYTES; + } + skein_assert(ctx->h.b_cnt == 0); + } + + /* copy any remaining source message data bytes into b[] */ + if (msg_byte_cnt) { + skein_assert(msg_byte_cnt + ctx->h.b_cnt <= + SKEIN_1024_BLOCK_BYTES); + memcpy(&ctx->b[ctx->h.b_cnt], msg, msg_byte_cnt); + ctx->h.b_cnt += msg_byte_cnt; + } + + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* finalize the hash computation and output the result */ +int skein_1024_final(struct skein_1024_ctx *ctx, u8 *hash_val) +{ + size_t i, n, byte_cnt; + u64 x[SKEIN_1024_STATE_WORDS]; + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_1024_BLOCK_BYTES, SKEIN_FAIL); + + /* tag as the final block */ + ctx->h.tweak[1] |= SKEIN_T1_FLAG_FINAL; + /* zero pad b[] if necessary */ + if (ctx->h.b_cnt < SKEIN_1024_BLOCK_BYTES) + memset(&ctx->b[ctx->h.b_cnt], 0, + SKEIN_1024_BLOCK_BYTES - ctx->h.b_cnt); + + /* process the final block */ + skein_1024_process_block(ctx, ctx->b, 1, ctx->h.b_cnt); + + /* now output the result */ + /* total number of output bytes */ + byte_cnt = (ctx->h.hash_bit_len + 7) >> 3; + + /* run Threefish in "counter mode" to generate output */ + /* zero out b[], so it can hold the counter */ + memset(ctx->b, 0, sizeof(ctx->b)); + /* keep a local copy of counter mode "key" */ + memcpy(x, ctx->x, sizeof(x)); + for (i = 0; i*SKEIN_1024_BLOCK_BYTES < byte_cnt; i++) { + /* build the counter block */ + ((u64 *)ctx->b)[0] = skein_swap64((u64) i); + skein_start_new_type(ctx, OUT_FINAL); + /* run "counter mode" */ + skein_1024_process_block(ctx, ctx->b, 1, sizeof(u64)); + /* number of output bytes left to go */ + n = byte_cnt - i*SKEIN_1024_BLOCK_BYTES; + if (n >= SKEIN_1024_BLOCK_BYTES) + n = SKEIN_1024_BLOCK_BYTES; + /* "output" the ctr mode bytes */ + skein_put64_lsb_first(hash_val+i*SKEIN_1024_BLOCK_BYTES, ctx->x, + n); + /* restore the counter mode key for next time */ + memcpy(ctx->x, x, sizeof(x)); + } + 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(struct skein_256_ctx *ctx, u8 *hash_val) +{ + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_256_BLOCK_BYTES, SKEIN_FAIL); + + /* tag as the final block */ + ctx->h.tweak[1] |= SKEIN_T1_FLAG_FINAL; + /* zero pad b[] if necessary */ + if (ctx->h.b_cnt < SKEIN_256_BLOCK_BYTES) + memset(&ctx->b[ctx->h.b_cnt], 0, + SKEIN_256_BLOCK_BYTES - ctx->h.b_cnt); + /* process the final block */ + skein_256_process_block(ctx, ctx->b, 1, ctx->h.b_cnt); + + /* "output" the state bytes */ + skein_put64_lsb_first(hash_val, ctx->x, SKEIN_256_BLOCK_BYTES); + + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* finalize the hash computation and output the block, no OUTPUT stage */ +int skein_512_final_pad(struct skein_512_ctx *ctx, u8 *hash_val) +{ + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_512_BLOCK_BYTES, SKEIN_FAIL); + + /* tag as the final block */ + ctx->h.tweak[1] |= SKEIN_T1_FLAG_FINAL; + /* zero pad b[] if necessary */ + if (ctx->h.b_cnt < SKEIN_512_BLOCK_BYTES) + memset(&ctx->b[ctx->h.b_cnt], 0, + SKEIN_512_BLOCK_BYTES - ctx->h.b_cnt); + /* process the final block */ + skein_512_process_block(ctx, ctx->b, 1, ctx->h.b_cnt); + + /* "output" the state bytes */ + skein_put64_lsb_first(hash_val, ctx->x, SKEIN_512_BLOCK_BYTES); + + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* finalize the hash computation and output the block, no OUTPUT stage */ +int skein_1024_final_pad(struct skein_1024_ctx *ctx, u8 *hash_val) +{ + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_1024_BLOCK_BYTES, SKEIN_FAIL); + + /* tag as the final block */ + ctx->h.tweak[1] |= SKEIN_T1_FLAG_FINAL; + /* zero pad b[] if necessary */ + if (ctx->h.b_cnt < SKEIN_1024_BLOCK_BYTES) + memset(&ctx->b[ctx->h.b_cnt], 0, + SKEIN_1024_BLOCK_BYTES - ctx->h.b_cnt); + /* process the final block */ + skein_1024_process_block(ctx, ctx->b, 1, ctx->h.b_cnt); + + /* "output" the state bytes */ + skein_put64_lsb_first(hash_val, ctx->x, SKEIN_1024_BLOCK_BYTES); + + return SKEIN_SUCCESS; +} + +#if SKEIN_TREE_HASH +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* just do the OUTPUT stage */ +int skein_256_output(struct skein_256_ctx *ctx, u8 *hash_val) +{ + size_t i, n, byte_cnt; + u64 x[SKEIN_256_STATE_WORDS]; + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_256_BLOCK_BYTES, SKEIN_FAIL); + + /* now output the result */ + /* total number of output bytes */ + byte_cnt = (ctx->h.hash_bit_len + 7) >> 3; + + /* run Threefish in "counter mode" to generate output */ + /* zero out b[], so it can hold the counter */ + memset(ctx->b, 0, sizeof(ctx->b)); + /* keep a local copy of counter mode "key" */ + memcpy(x, ctx->x, sizeof(x)); + for (i = 0; i*SKEIN_256_BLOCK_BYTES < byte_cnt; i++) { + /* build the counter block */ + ((u64 *)ctx->b)[0] = skein_swap64((u64) i); + skein_start_new_type(ctx, OUT_FINAL); + /* run "counter mode" */ + skein_256_process_block(ctx, ctx->b, 1, sizeof(u64)); + /* number of output bytes left to go */ + n = byte_cnt - i*SKEIN_256_BLOCK_BYTES; + if (n >= SKEIN_256_BLOCK_BYTES) + n = SKEIN_256_BLOCK_BYTES; + /* "output" the ctr mode bytes */ + skein_put64_lsb_first(hash_val+i*SKEIN_256_BLOCK_BYTES, ctx->x, + n); + /* restore the counter mode key for next time */ + memcpy(ctx->x, x, sizeof(x)); + } + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* just do the OUTPUT stage */ +int skein_512_output(struct skein_512_ctx *ctx, u8 *hash_val) +{ + size_t i, n, byte_cnt; + u64 x[SKEIN_512_STATE_WORDS]; + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_512_BLOCK_BYTES, SKEIN_FAIL); + + /* now output the result */ + /* total number of output bytes */ + byte_cnt = (ctx->h.hash_bit_len + 7) >> 3; + + /* run Threefish in "counter mode" to generate output */ + /* zero out b[], so it can hold the counter */ + memset(ctx->b, 0, sizeof(ctx->b)); + /* keep a local copy of counter mode "key" */ + memcpy(x, ctx->x, sizeof(x)); + for (i = 0; i*SKEIN_512_BLOCK_BYTES < byte_cnt; i++) { + /* build the counter block */ + ((u64 *)ctx->b)[0] = skein_swap64((u64) i); + skein_start_new_type(ctx, OUT_FINAL); + /* run "counter mode" */ + skein_512_process_block(ctx, ctx->b, 1, sizeof(u64)); + /* number of output bytes left to go */ + n = byte_cnt - i*SKEIN_512_BLOCK_BYTES; + if (n >= SKEIN_512_BLOCK_BYTES) + n = SKEIN_512_BLOCK_BYTES; + /* "output" the ctr mode bytes */ + skein_put64_lsb_first(hash_val+i*SKEIN_512_BLOCK_BYTES, ctx->x, + n); + /* restore the counter mode key for next time */ + memcpy(ctx->x, x, sizeof(x)); + } + return SKEIN_SUCCESS; +} + +/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ +/* just do the OUTPUT stage */ +int skein_1024_output(struct skein_1024_ctx *ctx, u8 *hash_val) +{ + size_t i, n, byte_cnt; + u64 x[SKEIN_1024_STATE_WORDS]; + /* catch uninitialized context */ + skein_assert_ret(ctx->h.b_cnt <= SKEIN_1024_BLOCK_BYTES, SKEIN_FAIL); + + /* now output the result */ + /* total number of output bytes */ + byte_cnt = (ctx->h.hash_bit_len + 7) >> 3; + + /* run Threefish in "counter mode" to generate output */ + /* zero out b[], so it can hold the counter */ + memset(ctx->b, 0, sizeof(ctx->b)); + /* keep a local copy of counter mode "key" */ + memcpy(x, ctx->x, sizeof(x)); + for (i = 0; i*SKEIN_1024_BLOCK_BYTES < byte_cnt; i++) { + /* build the counter block */ + ((u64 *)ctx->b)[0] = skein_swap64((u64) i); + skein_start_new_type(ctx, OUT_FINAL); + /* run "counter mode" */ + skein_1024_process_block(ctx, ctx->b, 1, sizeof(u64)); + /* number of output bytes left to go */ + n = byte_cnt - i*SKEIN_1024_BLOCK_BYTES; + if (n >= SKEIN_1024_BLOCK_BYTES) + n = SKEIN_1024_BLOCK_BYTES; + /* "output" the ctr mode bytes */ + skein_put64_lsb_first(hash_val+i*SKEIN_1024_BLOCK_BYTES, ctx->x, + n); + /* restore the counter mode key for next time */ + memcpy(ctx->x, x, sizeof(x)); + } + return SKEIN_SUCCESS; +} +#endif |