auth/hmac: complete overhaul
Now that there are dedicated struct for initial parameters, make the HMAC params provide a lc_hash_ctx to be used internally. This makes HMAC less special and allows it to work with any hash, instead of needing dedicated inits and ctx_news. As an upside, now it's possible to have a one-pass HMAC.
This commit is contained in:
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f6bddfcd70
commit
666b833b98
193
auth_hmac.c
193
auth_hmac.c
@ -20,8 +20,6 @@
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#include "auth.h"
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#include "hash.h"
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#include "impl_hmac.h"
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#include "impl_sha256.h"
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#include "impl_sha512.h"
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#include "util.h"
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@ -31,52 +29,34 @@
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static int
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hmac_common_init(void *arg, const uint8_t *key, size_t keylen)
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hmac_init(void *arg, void *initparams)
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{
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struct hmac_ctx *ctx = arg;
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struct lc_hmac_params *params = initparams;
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uint8_t ikeypad[HMAC_BLOCKLEN_MAX];
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size_t i, olen;
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size_t i, olen, blen, keylen;
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if (keylen > ctx->blocksz) {
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if (!lc_hash_init(ctx->hctx) ||
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!lc_hash_update(ctx->hctx, key, keylen) ||
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!lc_hash_final(ctx->hctx, ctx->key, &olen))
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ctx->hash = params->hash;
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keylen = params->keylen;
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blen = params->hash->impl->blocklen;
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if (keylen > blen) {
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if (!lc_hash(ctx->hash->impl, ctx->key, &olen, params->key,
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keylen))
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return 0;
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keylen = olen;
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} else
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for (i = 0; i < keylen; i++)
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ctx->key[i] = key[i];
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ctx->key[i] = params->key[i];
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for (i = keylen; i < ctx->blocksz; i++)
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for (i = keylen; i < blen; i++)
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ctx->key[i] = 0;
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for (i = 0; i < ctx->blocksz; i++)
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for (i = 0; i < blen; i++)
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ikeypad[i] = ctx->key[i] ^ HMAC_IPAD;
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return lc_hash_init(ctx->hctx) &&
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lc_hash_update(ctx->hctx, ikeypad, ctx->blocksz);
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}
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static int
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hmac_sha224_sha256_init(void *arg, void *initparams)
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{
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struct lc_hmac_params *params = initparams;
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struct hmac_ctx *ctx = arg;
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ctx->blocksz = LC_SHA256_BLOCKLEN;
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return hmac_common_init(ctx, params->key, params->keylen);
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}
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static int
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hmac_sha384_sha512_init(void *arg, void *initparams)
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{
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struct lc_hmac_params *params = initparams;
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struct hmac_ctx *ctx = arg;
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ctx->blocksz = LC_SHA512_BLOCKLEN;
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return hmac_common_init(ctx, params->key, params->keylen);
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return lc_hash_init(ctx->hash) &&
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lc_hash_update(ctx->hash, ikeypad, blen);
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}
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static int
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@ -84,153 +64,78 @@ hmac_update(void *arg, const uint8_t *in, size_t inlen)
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{
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struct hmac_ctx *ctx = arg;
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return lc_hash_update(ctx->hctx, in, inlen);
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return lc_hash_update(ctx->hash, in, inlen);
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}
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static int
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hmac_final(void *arg, uint8_t *out, size_t *outlen)
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{
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struct hmac_ctx *ctx = arg;
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struct lc_hash_ctx *hctx;
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uint8_t m[HMAC_BLOCKLEN_MAX],
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okeypad[HMAC_BLOCKLEN_MAX];
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size_t i, olen;
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uint8_t m[HMAC_BLOCKLEN_MAX], okeypad[HMAC_BLOCKLEN_MAX];
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size_t i, olen, blen;
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int rc;
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if (out == NULL) {
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(void)lc_hash_final(ctx->hctx, NULL, outlen);
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*outlen = ctx->hash->impl->hashlen;
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return 1;
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}
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hctx = ctx->hctx;
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*outlen = 0;
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for (i = 0; i < ctx->blocksz; i++)
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blen = ctx->hash->impl->blocklen;
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for (i = 0; i < blen; i++)
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okeypad[i] = ctx->key[i] ^ HMAC_OPAD;
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rc = lc_hash_final(ctx->hctx, m, &olen) &&
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lc_hash_init(ctx->hctx) &&
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lc_hash_update(ctx->hctx, okeypad, ctx->blocksz) &&
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lc_hash_update(ctx->hctx, m, olen) &&
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lc_hash_final(ctx->hctx, out, outlen);
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rc = lc_hash_final(ctx->hash, m, &olen) &&
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lc_hash_init(ctx->hash) &&
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lc_hash_update(ctx->hash, okeypad, blen) &&
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lc_hash_update(ctx->hash, m, olen) &&
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lc_hash_final(ctx->hash, out, outlen);
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lc_scrub(ctx, sizeof(*ctx));
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ctx->hctx = hctx;
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return rc;
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}
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static void *
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hmac_common_ctx_new(const struct lc_hash_impl *impl)
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static int
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hmac_auth(uint8_t *out, size_t *outlen, void *initparams, const uint8_t *in,
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size_t inlen)
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{
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struct hmac_ctx *ctx;
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struct lc_hmac_params *params = initparams;
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struct hmac_ctx ctx;
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ctx = malloc(sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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ctx->hctx = lc_hash_ctx_new(impl);
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if (ctx->hctx == NULL) {
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free(ctx);
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return NULL;
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if (out == NULL) {
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*outlen = params->hash->impl->hashlen;
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return 1;
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}
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return ctx;
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return hmac_init(&ctx, initparams) &&
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hmac_update(&ctx, in, inlen) &&
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hmac_final(&ctx, out, outlen);
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}
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static void *
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hmac_sha224_ctx_new(void)
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hmac_ctx_new(void)
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{
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return hmac_common_ctx_new(lc_hash_impl_sha224());
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}
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static void *
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hmac_sha256_ctx_new(void)
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{
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return hmac_common_ctx_new(lc_hash_impl_sha256());
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}
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static void *
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hmac_sha384_ctx_new(void)
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{
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return hmac_common_ctx_new(lc_hash_impl_sha384());
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}
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static void *
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hmac_sha512_ctx_new(void)
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{
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return hmac_common_ctx_new(lc_hash_impl_sha512());
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}
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static void
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hmac_ctx_free(void *arg)
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{
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struct hmac_ctx *ctx = arg;
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if (ctx != NULL)
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lc_hash_ctx_free(ctx->hctx);
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return malloc(sizeof(struct hmac_ctx));
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}
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static struct lc_auth_impl hmac_sha224_impl = {
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.init = &hmac_sha224_sha256_init,
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static struct lc_auth_impl hmac_impl = {
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.init = &hmac_init,
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.update = &hmac_update,
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.final = &hmac_final,
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.auth = NULL,
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.auth = &hmac_auth,
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.ctx_new = &hmac_sha224_ctx_new,
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.ctx_free = &hmac_ctx_free,
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};
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.ctx_new = &hmac_ctx_new,
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.ctx_free = NULL,
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static struct lc_auth_impl hmac_sha256_impl = {
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.init = &hmac_sha224_sha256_init,
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.update = &hmac_update,
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.final = &hmac_final,
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.auth = NULL,
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.ctx_new = &hmac_sha256_ctx_new,
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.ctx_free = &hmac_ctx_free,
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};
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static struct lc_auth_impl hmac_sha384_impl = {
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.init = &hmac_sha384_sha512_init,
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.update = &hmac_update,
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.final = &hmac_final,
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.auth = NULL,
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.ctx_new = &hmac_sha384_ctx_new,
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.ctx_free = &hmac_ctx_free,
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};
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static struct lc_auth_impl hmac_sha512_impl = {
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.init = &hmac_sha384_sha512_init,
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.update = &hmac_update,
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.final = &hmac_final,
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.auth = NULL,
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.ctx_new = &hmac_sha512_ctx_new,
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.ctx_free = &hmac_ctx_free,
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.blocklen = 0,
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.taglen = 0,
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};
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const struct lc_auth_impl *
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lc_auth_impl_hmac_sha224(void)
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lc_auth_impl_hmac(void)
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{
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return &hmac_sha224_impl;
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}
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const struct lc_auth_impl *
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lc_auth_impl_hmac_sha256(void)
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{
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return &hmac_sha256_impl;
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}
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const struct lc_auth_impl *
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lc_auth_impl_hmac_sha384(void)
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{
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return &hmac_sha384_impl;
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}
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const struct lc_auth_impl *
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lc_auth_impl_hmac_sha512(void)
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{
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return &hmac_sha512_impl;
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return &hmac_impl;
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}
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@ -21,7 +21,6 @@
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struct hmac_ctx {
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struct lc_hash_ctx *hctx;
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size_t blocksz;
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struct lc_hash_ctx *hash;
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uint8_t key[HMAC_BLOCKLEN_MAX];
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};
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@ -72,6 +72,7 @@ struct lc_hash_impl;
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/* Authentication. */
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struct lc_hmac_params {
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struct lc_hash_ctx *hash;
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size_t keylen;
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uint8_t *key;
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};
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@ -146,11 +147,8 @@ int lc_auth(const struct lc_auth_impl *, uint8_t *, size_t *, void *,
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struct lc_auth_ctx *lc_auth_ctx_new(const struct lc_auth_impl *);
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void lc_auth_ctx_free(struct lc_auth_ctx *);
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const struct lc_auth_impl *lc_auth_impl_hmac(void);
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const struct lc_auth_impl *lc_auth_impl_poly1305(void);
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const struct lc_auth_impl *lc_auth_impl_hmac_sha224(void);
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const struct lc_auth_impl *lc_auth_impl_hmac_sha256(void);
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const struct lc_auth_impl *lc_auth_impl_hmac_sha384(void);
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const struct lc_auth_impl *lc_auth_impl_hmac_sha512(void);
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/*
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@ -45,7 +45,7 @@ struct kwrunner {
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};
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static int hmac_sha2_runner(const struct lc_auth_impl *,
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static int hmac_sha2_runner(const struct lc_hash_impl *,
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const struct testcase *, int);
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static int hmac_sha224_runner(const struct testcase *, int);
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static int hmac_sha256_runner(const struct testcase *, int);
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@ -220,11 +220,10 @@ main(int argc, char *argv[])
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}
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static int
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hmac_sha2_runner(const struct lc_auth_impl *impl, const struct testcase *c,
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hmac_sha2_runner(const struct lc_hash_impl *impl, const struct testcase *c,
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int verbose)
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{
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struct lc_hmac_params params;
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struct lc_auth_ctx *ctx;
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uint8_t *buf;
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size_t olen;
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@ -233,20 +232,20 @@ hmac_sha2_runner(const struct lc_auth_impl *impl, const struct testcase *c,
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params.key = c->key;
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params.keylen = c->keylen;
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ctx = lc_auth_ctx_new(impl);
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if (ctx == NULL)
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errx(1, "can't allocate ctx");
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params.hash = lc_hash_ctx_new(impl);
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if (params.hash == NULL)
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return 0;
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if (!lc_auth_init(ctx, ¶ms) ||
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!lc_auth_update(ctx, c->msg, c->msglen) ||
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!lc_auth_final(ctx, NULL, &olen))
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if (!lc_auth(lc_auth_impl_hmac(), NULL, &olen, ¶ms, c->msg,
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c->msglen))
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return 0;
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buf = malloc(olen);
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if (buf == NULL)
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err(1, "out of memory");
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if (!lc_auth_final(ctx, buf, &olen))
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if (!lc_auth(lc_auth_impl_hmac(), buf, &olen, ¶ms, c->msg,
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c->msglen))
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return 0;
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/*
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@ -267,7 +266,7 @@ hmac_sha2_runner(const struct lc_auth_impl *impl, const struct testcase *c,
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}
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free(buf);
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lc_auth_ctx_free(ctx);
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lc_hash_ctx_free(params.hash);
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return 1;
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}
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@ -275,23 +274,23 @@ hmac_sha2_runner(const struct lc_auth_impl *impl, const struct testcase *c,
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static int
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hmac_sha224_runner(const struct testcase *c, int verbose)
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{
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return hmac_sha2_runner(lc_auth_impl_hmac_sha224(), c, verbose);
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return hmac_sha2_runner(lc_hash_impl_sha224(), c, verbose);
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}
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static int
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hmac_sha256_runner(const struct testcase *c, int verbose)
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{
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return hmac_sha2_runner(lc_auth_impl_hmac_sha256(), c, verbose);
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return hmac_sha2_runner(lc_hash_impl_sha256(), c, verbose);
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}
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static int
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hmac_sha384_runner(const struct testcase *c, int verbose)
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{
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return hmac_sha2_runner(lc_auth_impl_hmac_sha384(), c, verbose);
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return hmac_sha2_runner(lc_hash_impl_sha384(), c, verbose);
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}
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static int
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hmac_sha512_runner(const struct testcase *c, int verbose)
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{
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return hmac_sha2_runner(lc_auth_impl_hmac_sha512(), c, verbose);
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return hmac_sha2_runner(lc_hash_impl_sha512(), c, verbose);
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}
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