diff options
Diffstat (limited to 'lib/dns/hmac_link.c')
| -rw-r--r-- | lib/dns/hmac_link.c | 1687 |
1 files changed, 1687 insertions, 0 deletions
diff --git a/lib/dns/hmac_link.c b/lib/dns/hmac_link.c new file mode 100644 index 0000000..fce98d7 --- /dev/null +++ b/lib/dns/hmac_link.c @@ -0,0 +1,1687 @@ +/* + * Portions Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC") + * Portions Copyright (C) 1999-2002 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE + * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Portions Copyright (C) 1995-2000 by Network Associates, Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE + * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * Principal Author: Brian Wellington + * $Id: hmac_link.c,v 1.11 2008/04/01 23:47:10 tbox Exp $ + */ + +#include <config.h> + +#include <isc/buffer.h> +#include <isc/hmacmd5.h> +#include <isc/hmacsha.h> +#include <isc/md5.h> +#include <isc/sha1.h> +#include <isc/mem.h> +#include <isc/string.h> +#include <isc/util.h> + +#include <dst/result.h> + +#include "dst_internal.h" +#include "dst_parse.h" + +#define HMAC_LEN 64 +#define HMAC_IPAD 0x36 +#define HMAC_OPAD 0x5c + +static isc_result_t hmacmd5_fromdns(dst_key_t *key, isc_buffer_t *data); + +struct dst_hmacmd5_key { + unsigned char key[HMAC_LEN]; +}; + +static isc_result_t +getkeybits(dst_key_t *key, struct dst_private_element *element) { + + if (element->length != 2) + return (DST_R_INVALIDPRIVATEKEY); + + key->key_bits = (element->data[0] << 8) + element->data[1]; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacmd5_createctx(dst_key_t *key, dst_context_t *dctx) { + isc_hmacmd5_t *hmacmd5ctx; + dst_hmacmd5_key_t *hkey = key->keydata.hmacmd5; + + hmacmd5ctx = isc_mem_get(dctx->mctx, sizeof(isc_hmacmd5_t)); + if (hmacmd5ctx == NULL) + return (ISC_R_NOMEMORY); + isc_hmacmd5_init(hmacmd5ctx, hkey->key, HMAC_LEN); + dctx->ctxdata.hmacmd5ctx = hmacmd5ctx; + return (ISC_R_SUCCESS); +} + +static void +hmacmd5_destroyctx(dst_context_t *dctx) { + isc_hmacmd5_t *hmacmd5ctx = dctx->ctxdata.hmacmd5ctx; + + if (hmacmd5ctx != NULL) { + isc_hmacmd5_invalidate(hmacmd5ctx); + isc_mem_put(dctx->mctx, hmacmd5ctx, sizeof(isc_hmacmd5_t)); + dctx->ctxdata.hmacmd5ctx = NULL; + } +} + +static isc_result_t +hmacmd5_adddata(dst_context_t *dctx, const isc_region_t *data) { + isc_hmacmd5_t *hmacmd5ctx = dctx->ctxdata.hmacmd5ctx; + + isc_hmacmd5_update(hmacmd5ctx, data->base, data->length); + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacmd5_sign(dst_context_t *dctx, isc_buffer_t *sig) { + isc_hmacmd5_t *hmacmd5ctx = dctx->ctxdata.hmacmd5ctx; + unsigned char *digest; + + if (isc_buffer_availablelength(sig) < ISC_MD5_DIGESTLENGTH) + return (ISC_R_NOSPACE); + digest = isc_buffer_used(sig); + isc_hmacmd5_sign(hmacmd5ctx, digest); + isc_buffer_add(sig, ISC_MD5_DIGESTLENGTH); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacmd5_verify(dst_context_t *dctx, const isc_region_t *sig) { + isc_hmacmd5_t *hmacmd5ctx = dctx->ctxdata.hmacmd5ctx; + + if (sig->length > ISC_MD5_DIGESTLENGTH) + return (DST_R_VERIFYFAILURE); + + if (isc_hmacmd5_verify2(hmacmd5ctx, sig->base, sig->length)) + return (ISC_R_SUCCESS); + else + return (DST_R_VERIFYFAILURE); +} + +static isc_boolean_t +hmacmd5_compare(const dst_key_t *key1, const dst_key_t *key2) { + dst_hmacmd5_key_t *hkey1, *hkey2; + + hkey1 = key1->keydata.hmacmd5; + hkey2 = key2->keydata.hmacmd5; + + if (hkey1 == NULL && hkey2 == NULL) + return (ISC_TRUE); + else if (hkey1 == NULL || hkey2 == NULL) + return (ISC_FALSE); + + if (memcmp(hkey1->key, hkey2->key, HMAC_LEN) == 0) + return (ISC_TRUE); + else + return (ISC_FALSE); +} + +static isc_result_t +hmacmd5_generate(dst_key_t *key, int pseudorandom_ok) { + isc_buffer_t b; + isc_result_t ret; + int bytes; + unsigned char data[HMAC_LEN]; + + bytes = (key->key_size + 7) / 8; + if (bytes > HMAC_LEN) { + bytes = HMAC_LEN; + key->key_size = HMAC_LEN * 8; + } + + memset(data, 0, HMAC_LEN); + ret = dst__entropy_getdata(data, bytes, ISC_TF(pseudorandom_ok != 0)); + + if (ret != ISC_R_SUCCESS) + return (ret); + + isc_buffer_init(&b, data, bytes); + isc_buffer_add(&b, bytes); + ret = hmacmd5_fromdns(key, &b); + memset(data, 0, HMAC_LEN); + + return (ret); +} + +static isc_boolean_t +hmacmd5_isprivate(const dst_key_t *key) { + UNUSED(key); + return (ISC_TRUE); +} + +static void +hmacmd5_destroy(dst_key_t *key) { + dst_hmacmd5_key_t *hkey = key->keydata.hmacmd5; + memset(hkey, 0, sizeof(dst_hmacmd5_key_t)); + isc_mem_put(key->mctx, hkey, sizeof(dst_hmacmd5_key_t)); + key->keydata.hmacmd5 = NULL; +} + +static isc_result_t +hmacmd5_todns(const dst_key_t *key, isc_buffer_t *data) { + dst_hmacmd5_key_t *hkey; + unsigned int bytes; + + REQUIRE(key->keydata.hmacmd5 != NULL); + + hkey = key->keydata.hmacmd5; + + bytes = (key->key_size + 7) / 8; + if (isc_buffer_availablelength(data) < bytes) + return (ISC_R_NOSPACE); + isc_buffer_putmem(data, hkey->key, bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacmd5_fromdns(dst_key_t *key, isc_buffer_t *data) { + dst_hmacmd5_key_t *hkey; + int keylen; + isc_region_t r; + isc_md5_t md5ctx; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + hkey = isc_mem_get(key->mctx, sizeof(dst_hmacmd5_key_t)); + if (hkey == NULL) + return (ISC_R_NOMEMORY); + + memset(hkey->key, 0, sizeof(hkey->key)); + + if (r.length > HMAC_LEN) { + isc_md5_init(&md5ctx); + isc_md5_update(&md5ctx, r.base, r.length); + isc_md5_final(&md5ctx, hkey->key); + keylen = ISC_MD5_DIGESTLENGTH; + } + else { + memcpy(hkey->key, r.base, r.length); + keylen = r.length; + } + + key->key_size = keylen * 8; + key->keydata.hmacmd5 = hkey; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacmd5_tofile(const dst_key_t *key, const char *directory) { + int cnt = 0; + dst_hmacmd5_key_t *hkey; + dst_private_t priv; + int bytes = (key->key_size + 7) / 8; + unsigned char buf[2]; + + if (key->keydata.hmacmd5 == NULL) + return (DST_R_NULLKEY); + + hkey = key->keydata.hmacmd5; + + priv.elements[cnt].tag = TAG_HMACMD5_KEY; + priv.elements[cnt].length = bytes; + priv.elements[cnt++].data = hkey->key; + + buf[0] = (key->key_bits >> 8) & 0xffU; + buf[1] = key->key_bits & 0xffU; + priv.elements[cnt].tag = TAG_HMACMD5_BITS; + priv.elements[cnt].data = buf; + priv.elements[cnt++].length = 2; + + priv.nelements = cnt; + return (dst__privstruct_writefile(key, &priv, directory)); +} + +static isc_result_t +hmacmd5_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t result, tresult; + isc_buffer_t b; + isc_mem_t *mctx = key->mctx; + unsigned int i; + + /* read private key file */ + result = dst__privstruct_parse(key, DST_ALG_HMACMD5, lexer, mctx, &priv); + if (result != ISC_R_SUCCESS) + return (result); + + key->key_bits = 0; + for (i = 0; i < priv.nelements && result == ISC_R_SUCCESS; i++) { + switch (priv.elements[i].tag) { + case TAG_HMACMD5_KEY: + isc_buffer_init(&b, priv.elements[i].data, + priv.elements[i].length); + isc_buffer_add(&b, priv.elements[i].length); + tresult = hmacmd5_fromdns(key, &b); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + case TAG_HMACMD5_BITS: + tresult = getkeybits(key, &priv.elements[i]); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + default: + result = DST_R_INVALIDPRIVATEKEY; + break; + } + } + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (result); +} + +static dst_func_t hmacmd5_functions = { + hmacmd5_createctx, + hmacmd5_destroyctx, + hmacmd5_adddata, + hmacmd5_sign, + hmacmd5_verify, + NULL, /*%< computesecret */ + hmacmd5_compare, + NULL, /*%< paramcompare */ + hmacmd5_generate, + hmacmd5_isprivate, + hmacmd5_destroy, + hmacmd5_todns, + hmacmd5_fromdns, + hmacmd5_tofile, + hmacmd5_parse, + NULL, /*%< cleanup */ + NULL, /*%< fromlabel */ +}; + +isc_result_t +dst__hmacmd5_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &hmacmd5_functions; + return (ISC_R_SUCCESS); +} + +static isc_result_t hmacsha1_fromdns(dst_key_t *key, isc_buffer_t *data); + +struct dst_hmacsha1_key { + unsigned char key[ISC_SHA1_DIGESTLENGTH]; +}; + +static isc_result_t +hmacsha1_createctx(dst_key_t *key, dst_context_t *dctx) { + isc_hmacsha1_t *hmacsha1ctx; + dst_hmacsha1_key_t *hkey = key->keydata.hmacsha1; + + hmacsha1ctx = isc_mem_get(dctx->mctx, sizeof(isc_hmacsha1_t)); + if (hmacsha1ctx == NULL) + return (ISC_R_NOMEMORY); + isc_hmacsha1_init(hmacsha1ctx, hkey->key, ISC_SHA1_DIGESTLENGTH); + dctx->ctxdata.hmacsha1ctx = hmacsha1ctx; + return (ISC_R_SUCCESS); +} + +static void +hmacsha1_destroyctx(dst_context_t *dctx) { + isc_hmacsha1_t *hmacsha1ctx = dctx->ctxdata.hmacsha1ctx; + + if (hmacsha1ctx != NULL) { + isc_hmacsha1_invalidate(hmacsha1ctx); + isc_mem_put(dctx->mctx, hmacsha1ctx, sizeof(isc_hmacsha1_t)); + dctx->ctxdata.hmacsha1ctx = NULL; + } +} + +static isc_result_t +hmacsha1_adddata(dst_context_t *dctx, const isc_region_t *data) { + isc_hmacsha1_t *hmacsha1ctx = dctx->ctxdata.hmacsha1ctx; + + isc_hmacsha1_update(hmacsha1ctx, data->base, data->length); + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha1_sign(dst_context_t *dctx, isc_buffer_t *sig) { + isc_hmacsha1_t *hmacsha1ctx = dctx->ctxdata.hmacsha1ctx; + unsigned char *digest; + + if (isc_buffer_availablelength(sig) < ISC_SHA1_DIGESTLENGTH) + return (ISC_R_NOSPACE); + digest = isc_buffer_used(sig); + isc_hmacsha1_sign(hmacsha1ctx, digest, ISC_SHA1_DIGESTLENGTH); + isc_buffer_add(sig, ISC_SHA1_DIGESTLENGTH); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha1_verify(dst_context_t *dctx, const isc_region_t *sig) { + isc_hmacsha1_t *hmacsha1ctx = dctx->ctxdata.hmacsha1ctx; + + if (sig->length > ISC_SHA1_DIGESTLENGTH || sig->length == 0) + return (DST_R_VERIFYFAILURE); + + if (isc_hmacsha1_verify(hmacsha1ctx, sig->base, sig->length)) + return (ISC_R_SUCCESS); + else + return (DST_R_VERIFYFAILURE); +} + +static isc_boolean_t +hmacsha1_compare(const dst_key_t *key1, const dst_key_t *key2) { + dst_hmacsha1_key_t *hkey1, *hkey2; + + hkey1 = key1->keydata.hmacsha1; + hkey2 = key2->keydata.hmacsha1; + + if (hkey1 == NULL && hkey2 == NULL) + return (ISC_TRUE); + else if (hkey1 == NULL || hkey2 == NULL) + return (ISC_FALSE); + + if (memcmp(hkey1->key, hkey2->key, ISC_SHA1_DIGESTLENGTH) == 0) + return (ISC_TRUE); + else + return (ISC_FALSE); +} + +static isc_result_t +hmacsha1_generate(dst_key_t *key, int pseudorandom_ok) { + isc_buffer_t b; + isc_result_t ret; + int bytes; + unsigned char data[HMAC_LEN]; + + bytes = (key->key_size + 7) / 8; + if (bytes > HMAC_LEN) { + bytes = HMAC_LEN; + key->key_size = HMAC_LEN * 8; + } + + memset(data, 0, HMAC_LEN); + ret = dst__entropy_getdata(data, bytes, ISC_TF(pseudorandom_ok != 0)); + + if (ret != ISC_R_SUCCESS) + return (ret); + + isc_buffer_init(&b, data, bytes); + isc_buffer_add(&b, bytes); + ret = hmacsha1_fromdns(key, &b); + memset(data, 0, ISC_SHA1_DIGESTLENGTH); + + return (ret); +} + +static isc_boolean_t +hmacsha1_isprivate(const dst_key_t *key) { + UNUSED(key); + return (ISC_TRUE); +} + +static void +hmacsha1_destroy(dst_key_t *key) { + dst_hmacsha1_key_t *hkey = key->keydata.hmacsha1; + memset(hkey, 0, sizeof(dst_hmacsha1_key_t)); + isc_mem_put(key->mctx, hkey, sizeof(dst_hmacsha1_key_t)); + key->keydata.hmacsha1 = NULL; +} + +static isc_result_t +hmacsha1_todns(const dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha1_key_t *hkey; + unsigned int bytes; + + REQUIRE(key->keydata.hmacsha1 != NULL); + + hkey = key->keydata.hmacsha1; + + bytes = (key->key_size + 7) / 8; + if (isc_buffer_availablelength(data) < bytes) + return (ISC_R_NOSPACE); + isc_buffer_putmem(data, hkey->key, bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha1_fromdns(dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha1_key_t *hkey; + int keylen; + isc_region_t r; + isc_sha1_t sha1ctx; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + hkey = isc_mem_get(key->mctx, sizeof(dst_hmacsha1_key_t)); + if (hkey == NULL) + return (ISC_R_NOMEMORY); + + memset(hkey->key, 0, sizeof(hkey->key)); + + if (r.length > ISC_SHA1_DIGESTLENGTH) { + isc_sha1_init(&sha1ctx); + isc_sha1_update(&sha1ctx, r.base, r.length); + isc_sha1_final(&sha1ctx, hkey->key); + keylen = ISC_SHA1_DIGESTLENGTH; + } + else { + memcpy(hkey->key, r.base, r.length); + keylen = r.length; + } + + key->key_size = keylen * 8; + key->keydata.hmacsha1 = hkey; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha1_tofile(const dst_key_t *key, const char *directory) { + int cnt = 0; + dst_hmacsha1_key_t *hkey; + dst_private_t priv; + int bytes = (key->key_size + 7) / 8; + unsigned char buf[2]; + + if (key->keydata.hmacsha1 == NULL) + return (DST_R_NULLKEY); + + hkey = key->keydata.hmacsha1; + + priv.elements[cnt].tag = TAG_HMACSHA1_KEY; + priv.elements[cnt].length = bytes; + priv.elements[cnt++].data = hkey->key; + + buf[0] = (key->key_bits >> 8) & 0xffU; + buf[1] = key->key_bits & 0xffU; + priv.elements[cnt].tag = TAG_HMACSHA1_BITS; + priv.elements[cnt].data = buf; + priv.elements[cnt++].length = 2; + + priv.nelements = cnt; + return (dst__privstruct_writefile(key, &priv, directory)); +} + +static isc_result_t +hmacsha1_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t result, tresult; + isc_buffer_t b; + isc_mem_t *mctx = key->mctx; + unsigned int i; + + /* read private key file */ + result = dst__privstruct_parse(key, DST_ALG_HMACSHA1, lexer, mctx, + &priv); + if (result != ISC_R_SUCCESS) + return (result); + + key->key_bits = 0; + for (i = 0; i < priv.nelements; i++) { + switch (priv.elements[i].tag) { + case TAG_HMACSHA1_KEY: + isc_buffer_init(&b, priv.elements[i].data, + priv.elements[i].length); + isc_buffer_add(&b, priv.elements[i].length); + tresult = hmacsha1_fromdns(key, &b); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + case TAG_HMACSHA1_BITS: + tresult = getkeybits(key, &priv.elements[i]); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + default: + result = DST_R_INVALIDPRIVATEKEY; + break; + } + } + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (result); +} + +static dst_func_t hmacsha1_functions = { + hmacsha1_createctx, + hmacsha1_destroyctx, + hmacsha1_adddata, + hmacsha1_sign, + hmacsha1_verify, + NULL, /* computesecret */ + hmacsha1_compare, + NULL, /* paramcompare */ + hmacsha1_generate, + hmacsha1_isprivate, + hmacsha1_destroy, + hmacsha1_todns, + hmacsha1_fromdns, + hmacsha1_tofile, + hmacsha1_parse, + NULL, /* cleanup */ + NULL, /* fromlabel */ +}; + +isc_result_t +dst__hmacsha1_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &hmacsha1_functions; + return (ISC_R_SUCCESS); +} + +static isc_result_t hmacsha224_fromdns(dst_key_t *key, isc_buffer_t *data); + +struct dst_hmacsha224_key { + unsigned char key[ISC_SHA224_DIGESTLENGTH]; +}; + +static isc_result_t +hmacsha224_createctx(dst_key_t *key, dst_context_t *dctx) { + isc_hmacsha224_t *hmacsha224ctx; + dst_hmacsha224_key_t *hkey = key->keydata.hmacsha224; + + hmacsha224ctx = isc_mem_get(dctx->mctx, sizeof(isc_hmacsha224_t)); + if (hmacsha224ctx == NULL) + return (ISC_R_NOMEMORY); + isc_hmacsha224_init(hmacsha224ctx, hkey->key, ISC_SHA224_DIGESTLENGTH); + dctx->ctxdata.hmacsha224ctx = hmacsha224ctx; + return (ISC_R_SUCCESS); +} + +static void +hmacsha224_destroyctx(dst_context_t *dctx) { + isc_hmacsha224_t *hmacsha224ctx = dctx->ctxdata.hmacsha224ctx; + + if (hmacsha224ctx != NULL) { + isc_hmacsha224_invalidate(hmacsha224ctx); + isc_mem_put(dctx->mctx, hmacsha224ctx, sizeof(isc_hmacsha224_t)); + dctx->ctxdata.hmacsha224ctx = NULL; + } +} + +static isc_result_t +hmacsha224_adddata(dst_context_t *dctx, const isc_region_t *data) { + isc_hmacsha224_t *hmacsha224ctx = dctx->ctxdata.hmacsha224ctx; + + isc_hmacsha224_update(hmacsha224ctx, data->base, data->length); + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha224_sign(dst_context_t *dctx, isc_buffer_t *sig) { + isc_hmacsha224_t *hmacsha224ctx = dctx->ctxdata.hmacsha224ctx; + unsigned char *digest; + + if (isc_buffer_availablelength(sig) < ISC_SHA224_DIGESTLENGTH) + return (ISC_R_NOSPACE); + digest = isc_buffer_used(sig); + isc_hmacsha224_sign(hmacsha224ctx, digest, ISC_SHA224_DIGESTLENGTH); + isc_buffer_add(sig, ISC_SHA224_DIGESTLENGTH); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha224_verify(dst_context_t *dctx, const isc_region_t *sig) { + isc_hmacsha224_t *hmacsha224ctx = dctx->ctxdata.hmacsha224ctx; + + if (sig->length > ISC_SHA224_DIGESTLENGTH || sig->length == 0) + return (DST_R_VERIFYFAILURE); + + if (isc_hmacsha224_verify(hmacsha224ctx, sig->base, sig->length)) + return (ISC_R_SUCCESS); + else + return (DST_R_VERIFYFAILURE); +} + +static isc_boolean_t +hmacsha224_compare(const dst_key_t *key1, const dst_key_t *key2) { + dst_hmacsha224_key_t *hkey1, *hkey2; + + hkey1 = key1->keydata.hmacsha224; + hkey2 = key2->keydata.hmacsha224; + + if (hkey1 == NULL && hkey2 == NULL) + return (ISC_TRUE); + else if (hkey1 == NULL || hkey2 == NULL) + return (ISC_FALSE); + + if (memcmp(hkey1->key, hkey2->key, ISC_SHA224_DIGESTLENGTH) == 0) + return (ISC_TRUE); + else + return (ISC_FALSE); +} + +static isc_result_t +hmacsha224_generate(dst_key_t *key, int pseudorandom_ok) { + isc_buffer_t b; + isc_result_t ret; + int bytes; + unsigned char data[HMAC_LEN]; + + bytes = (key->key_size + 7) / 8; + if (bytes > HMAC_LEN) { + bytes = HMAC_LEN; + key->key_size = HMAC_LEN * 8; + } + + memset(data, 0, HMAC_LEN); + ret = dst__entropy_getdata(data, bytes, ISC_TF(pseudorandom_ok != 0)); + + if (ret != ISC_R_SUCCESS) + return (ret); + + isc_buffer_init(&b, data, bytes); + isc_buffer_add(&b, bytes); + ret = hmacsha224_fromdns(key, &b); + memset(data, 0, ISC_SHA224_DIGESTLENGTH); + + return (ret); +} + +static isc_boolean_t +hmacsha224_isprivate(const dst_key_t *key) { + UNUSED(key); + return (ISC_TRUE); +} + +static void +hmacsha224_destroy(dst_key_t *key) { + dst_hmacsha224_key_t *hkey = key->keydata.hmacsha224; + memset(hkey, 0, sizeof(dst_hmacsha224_key_t)); + isc_mem_put(key->mctx, hkey, sizeof(dst_hmacsha224_key_t)); + key->keydata.hmacsha224 = NULL; +} + +static isc_result_t +hmacsha224_todns(const dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha224_key_t *hkey; + unsigned int bytes; + + REQUIRE(key->keydata.hmacsha224 != NULL); + + hkey = key->keydata.hmacsha224; + + bytes = (key->key_size + 7) / 8; + if (isc_buffer_availablelength(data) < bytes) + return (ISC_R_NOSPACE); + isc_buffer_putmem(data, hkey->key, bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha224_fromdns(dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha224_key_t *hkey; + int keylen; + isc_region_t r; + isc_sha224_t sha224ctx; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + hkey = isc_mem_get(key->mctx, sizeof(dst_hmacsha224_key_t)); + if (hkey == NULL) + return (ISC_R_NOMEMORY); + + memset(hkey->key, 0, sizeof(hkey->key)); + + if (r.length > ISC_SHA224_DIGESTLENGTH) { + isc_sha224_init(&sha224ctx); + isc_sha224_update(&sha224ctx, r.base, r.length); + isc_sha224_final(hkey->key, &sha224ctx); + keylen = ISC_SHA224_DIGESTLENGTH; + } + else { + memcpy(hkey->key, r.base, r.length); + keylen = r.length; + } + + key->key_size = keylen * 8; + key->keydata.hmacsha224 = hkey; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha224_tofile(const dst_key_t *key, const char *directory) { + int cnt = 0; + dst_hmacsha224_key_t *hkey; + dst_private_t priv; + int bytes = (key->key_size + 7) / 8; + unsigned char buf[2]; + + if (key->keydata.hmacsha224 == NULL) + return (DST_R_NULLKEY); + + hkey = key->keydata.hmacsha224; + + priv.elements[cnt].tag = TAG_HMACSHA224_KEY; + priv.elements[cnt].length = bytes; + priv.elements[cnt++].data = hkey->key; + + buf[0] = (key->key_bits >> 8) & 0xffU; + buf[1] = key->key_bits & 0xffU; + priv.elements[cnt].tag = TAG_HMACSHA224_BITS; + priv.elements[cnt].data = buf; + priv.elements[cnt++].length = 2; + + priv.nelements = cnt; + return (dst__privstruct_writefile(key, &priv, directory)); +} + +static isc_result_t +hmacsha224_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t result, tresult; + isc_buffer_t b; + isc_mem_t *mctx = key->mctx; + unsigned int i; + + /* read private key file */ + result = dst__privstruct_parse(key, DST_ALG_HMACSHA224, lexer, mctx, + &priv); + if (result != ISC_R_SUCCESS) + return (result); + + key->key_bits = 0; + for (i = 0; i < priv.nelements; i++) { + switch (priv.elements[i].tag) { + case TAG_HMACSHA224_KEY: + isc_buffer_init(&b, priv.elements[i].data, + priv.elements[i].length); + isc_buffer_add(&b, priv.elements[i].length); + tresult = hmacsha224_fromdns(key, &b); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + case TAG_HMACSHA224_BITS: + tresult = getkeybits(key, &priv.elements[i]); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + default: + result = DST_R_INVALIDPRIVATEKEY; + break; + } + } + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (result); +} + +static dst_func_t hmacsha224_functions = { + hmacsha224_createctx, + hmacsha224_destroyctx, + hmacsha224_adddata, + hmacsha224_sign, + hmacsha224_verify, + NULL, /* computesecret */ + hmacsha224_compare, + NULL, /* paramcompare */ + hmacsha224_generate, + hmacsha224_isprivate, + hmacsha224_destroy, + hmacsha224_todns, + hmacsha224_fromdns, + hmacsha224_tofile, + hmacsha224_parse, + NULL, /* cleanup */ + NULL, /* fromlabel */ +}; + +isc_result_t +dst__hmacsha224_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &hmacsha224_functions; + return (ISC_R_SUCCESS); +} + +static isc_result_t hmacsha256_fromdns(dst_key_t *key, isc_buffer_t *data); + +struct dst_hmacsha256_key { + unsigned char key[ISC_SHA256_DIGESTLENGTH]; +}; + +static isc_result_t +hmacsha256_createctx(dst_key_t *key, dst_context_t *dctx) { + isc_hmacsha256_t *hmacsha256ctx; + dst_hmacsha256_key_t *hkey = key->keydata.hmacsha256; + + hmacsha256ctx = isc_mem_get(dctx->mctx, sizeof(isc_hmacsha256_t)); + if (hmacsha256ctx == NULL) + return (ISC_R_NOMEMORY); + isc_hmacsha256_init(hmacsha256ctx, hkey->key, ISC_SHA256_DIGESTLENGTH); + dctx->ctxdata.hmacsha256ctx = hmacsha256ctx; + return (ISC_R_SUCCESS); +} + +static void +hmacsha256_destroyctx(dst_context_t *dctx) { + isc_hmacsha256_t *hmacsha256ctx = dctx->ctxdata.hmacsha256ctx; + + if (hmacsha256ctx != NULL) { + isc_hmacsha256_invalidate(hmacsha256ctx); + isc_mem_put(dctx->mctx, hmacsha256ctx, sizeof(isc_hmacsha256_t)); + dctx->ctxdata.hmacsha256ctx = NULL; + } +} + +static isc_result_t +hmacsha256_adddata(dst_context_t *dctx, const isc_region_t *data) { + isc_hmacsha256_t *hmacsha256ctx = dctx->ctxdata.hmacsha256ctx; + + isc_hmacsha256_update(hmacsha256ctx, data->base, data->length); + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha256_sign(dst_context_t *dctx, isc_buffer_t *sig) { + isc_hmacsha256_t *hmacsha256ctx = dctx->ctxdata.hmacsha256ctx; + unsigned char *digest; + + if (isc_buffer_availablelength(sig) < ISC_SHA256_DIGESTLENGTH) + return (ISC_R_NOSPACE); + digest = isc_buffer_used(sig); + isc_hmacsha256_sign(hmacsha256ctx, digest, ISC_SHA256_DIGESTLENGTH); + isc_buffer_add(sig, ISC_SHA256_DIGESTLENGTH); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha256_verify(dst_context_t *dctx, const isc_region_t *sig) { + isc_hmacsha256_t *hmacsha256ctx = dctx->ctxdata.hmacsha256ctx; + + if (sig->length > ISC_SHA256_DIGESTLENGTH || sig->length == 0) + return (DST_R_VERIFYFAILURE); + + if (isc_hmacsha256_verify(hmacsha256ctx, sig->base, sig->length)) + return (ISC_R_SUCCESS); + else + return (DST_R_VERIFYFAILURE); +} + +static isc_boolean_t +hmacsha256_compare(const dst_key_t *key1, const dst_key_t *key2) { + dst_hmacsha256_key_t *hkey1, *hkey2; + + hkey1 = key1->keydata.hmacsha256; + hkey2 = key2->keydata.hmacsha256; + + if (hkey1 == NULL && hkey2 == NULL) + return (ISC_TRUE); + else if (hkey1 == NULL || hkey2 == NULL) + return (ISC_FALSE); + + if (memcmp(hkey1->key, hkey2->key, ISC_SHA256_DIGESTLENGTH) == 0) + return (ISC_TRUE); + else + return (ISC_FALSE); +} + +static isc_result_t +hmacsha256_generate(dst_key_t *key, int pseudorandom_ok) { + isc_buffer_t b; + isc_result_t ret; + int bytes; + unsigned char data[HMAC_LEN]; + + bytes = (key->key_size + 7) / 8; + if (bytes > HMAC_LEN) { + bytes = HMAC_LEN; + key->key_size = HMAC_LEN * 8; + } + + memset(data, 0, HMAC_LEN); + ret = dst__entropy_getdata(data, bytes, ISC_TF(pseudorandom_ok != 0)); + + if (ret != ISC_R_SUCCESS) + return (ret); + + isc_buffer_init(&b, data, bytes); + isc_buffer_add(&b, bytes); + ret = hmacsha256_fromdns(key, &b); + memset(data, 0, ISC_SHA256_DIGESTLENGTH); + + return (ret); +} + +static isc_boolean_t +hmacsha256_isprivate(const dst_key_t *key) { + UNUSED(key); + return (ISC_TRUE); +} + +static void +hmacsha256_destroy(dst_key_t *key) { + dst_hmacsha256_key_t *hkey = key->keydata.hmacsha256; + memset(hkey, 0, sizeof(dst_hmacsha256_key_t)); + isc_mem_put(key->mctx, hkey, sizeof(dst_hmacsha256_key_t)); + key->keydata.hmacsha256 = NULL; +} + +static isc_result_t +hmacsha256_todns(const dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha256_key_t *hkey; + unsigned int bytes; + + REQUIRE(key->keydata.hmacsha256 != NULL); + + hkey = key->keydata.hmacsha256; + + bytes = (key->key_size + 7) / 8; + if (isc_buffer_availablelength(data) < bytes) + return (ISC_R_NOSPACE); + isc_buffer_putmem(data, hkey->key, bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha256_fromdns(dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha256_key_t *hkey; + int keylen; + isc_region_t r; + isc_sha256_t sha256ctx; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + hkey = isc_mem_get(key->mctx, sizeof(dst_hmacsha256_key_t)); + if (hkey == NULL) + return (ISC_R_NOMEMORY); + + memset(hkey->key, 0, sizeof(hkey->key)); + + if (r.length > ISC_SHA256_DIGESTLENGTH) { + isc_sha256_init(&sha256ctx); + isc_sha256_update(&sha256ctx, r.base, r.length); + isc_sha256_final(hkey->key, &sha256ctx); + keylen = ISC_SHA256_DIGESTLENGTH; + } + else { + memcpy(hkey->key, r.base, r.length); + keylen = r.length; + } + + key->key_size = keylen * 8; + key->keydata.hmacsha256 = hkey; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha256_tofile(const dst_key_t *key, const char *directory) { + int cnt = 0; + dst_hmacsha256_key_t *hkey; + dst_private_t priv; + int bytes = (key->key_size + 7) / 8; + unsigned char buf[2]; + + if (key->keydata.hmacsha256 == NULL) + return (DST_R_NULLKEY); + + hkey = key->keydata.hmacsha256; + + priv.elements[cnt].tag = TAG_HMACSHA256_KEY; + priv.elements[cnt].length = bytes; + priv.elements[cnt++].data = hkey->key; + + buf[0] = (key->key_bits >> 8) & 0xffU; + buf[1] = key->key_bits & 0xffU; + priv.elements[cnt].tag = TAG_HMACSHA256_BITS; + priv.elements[cnt].data = buf; + priv.elements[cnt++].length = 2; + + priv.nelements = cnt; + return (dst__privstruct_writefile(key, &priv, directory)); +} + +static isc_result_t +hmacsha256_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t result, tresult; + isc_buffer_t b; + isc_mem_t *mctx = key->mctx; + unsigned int i; + + /* read private key file */ + result = dst__privstruct_parse(key, DST_ALG_HMACSHA256, lexer, mctx, + &priv); + if (result != ISC_R_SUCCESS) + return (result); + + key->key_bits = 0; + for (i = 0; i < priv.nelements; i++) { + switch (priv.elements[i].tag) { + case TAG_HMACSHA256_KEY: + isc_buffer_init(&b, priv.elements[i].data, + priv.elements[i].length); + isc_buffer_add(&b, priv.elements[i].length); + tresult = hmacsha256_fromdns(key, &b); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + case TAG_HMACSHA256_BITS: + tresult = getkeybits(key, &priv.elements[i]); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + default: + result = DST_R_INVALIDPRIVATEKEY; + break; + } + } + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (result); +} + +static dst_func_t hmacsha256_functions = { + hmacsha256_createctx, + hmacsha256_destroyctx, + hmacsha256_adddata, + hmacsha256_sign, + hmacsha256_verify, + NULL, /* computesecret */ + hmacsha256_compare, + NULL, /* paramcompare */ + hmacsha256_generate, + hmacsha256_isprivate, + hmacsha256_destroy, + hmacsha256_todns, + hmacsha256_fromdns, + hmacsha256_tofile, + hmacsha256_parse, + NULL, /* cleanup */ + NULL, /* fromlabel */ +}; + +isc_result_t +dst__hmacsha256_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &hmacsha256_functions; + return (ISC_R_SUCCESS); +} + +static isc_result_t hmacsha384_fromdns(dst_key_t *key, isc_buffer_t *data); + +struct dst_hmacsha384_key { + unsigned char key[ISC_SHA384_DIGESTLENGTH]; +}; + +static isc_result_t +hmacsha384_createctx(dst_key_t *key, dst_context_t *dctx) { + isc_hmacsha384_t *hmacsha384ctx; + dst_hmacsha384_key_t *hkey = key->keydata.hmacsha384; + + hmacsha384ctx = isc_mem_get(dctx->mctx, sizeof(isc_hmacsha384_t)); + if (hmacsha384ctx == NULL) + return (ISC_R_NOMEMORY); + isc_hmacsha384_init(hmacsha384ctx, hkey->key, ISC_SHA384_DIGESTLENGTH); + dctx->ctxdata.hmacsha384ctx = hmacsha384ctx; + return (ISC_R_SUCCESS); +} + +static void +hmacsha384_destroyctx(dst_context_t *dctx) { + isc_hmacsha384_t *hmacsha384ctx = dctx->ctxdata.hmacsha384ctx; + + if (hmacsha384ctx != NULL) { + isc_hmacsha384_invalidate(hmacsha384ctx); + isc_mem_put(dctx->mctx, hmacsha384ctx, sizeof(isc_hmacsha384_t)); + dctx->ctxdata.hmacsha384ctx = NULL; + } +} + +static isc_result_t +hmacsha384_adddata(dst_context_t *dctx, const isc_region_t *data) { + isc_hmacsha384_t *hmacsha384ctx = dctx->ctxdata.hmacsha384ctx; + + isc_hmacsha384_update(hmacsha384ctx, data->base, data->length); + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha384_sign(dst_context_t *dctx, isc_buffer_t *sig) { + isc_hmacsha384_t *hmacsha384ctx = dctx->ctxdata.hmacsha384ctx; + unsigned char *digest; + + if (isc_buffer_availablelength(sig) < ISC_SHA384_DIGESTLENGTH) + return (ISC_R_NOSPACE); + digest = isc_buffer_used(sig); + isc_hmacsha384_sign(hmacsha384ctx, digest, ISC_SHA384_DIGESTLENGTH); + isc_buffer_add(sig, ISC_SHA384_DIGESTLENGTH); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha384_verify(dst_context_t *dctx, const isc_region_t *sig) { + isc_hmacsha384_t *hmacsha384ctx = dctx->ctxdata.hmacsha384ctx; + + if (sig->length > ISC_SHA384_DIGESTLENGTH || sig->length == 0) + return (DST_R_VERIFYFAILURE); + + if (isc_hmacsha384_verify(hmacsha384ctx, sig->base, sig->length)) + return (ISC_R_SUCCESS); + else + return (DST_R_VERIFYFAILURE); +} + +static isc_boolean_t +hmacsha384_compare(const dst_key_t *key1, const dst_key_t *key2) { + dst_hmacsha384_key_t *hkey1, *hkey2; + + hkey1 = key1->keydata.hmacsha384; + hkey2 = key2->keydata.hmacsha384; + + if (hkey1 == NULL && hkey2 == NULL) + return (ISC_TRUE); + else if (hkey1 == NULL || hkey2 == NULL) + return (ISC_FALSE); + + if (memcmp(hkey1->key, hkey2->key, ISC_SHA384_DIGESTLENGTH) == 0) + return (ISC_TRUE); + else + return (ISC_FALSE); +} + +static isc_result_t +hmacsha384_generate(dst_key_t *key, int pseudorandom_ok) { + isc_buffer_t b; + isc_result_t ret; + int bytes; + unsigned char data[HMAC_LEN]; + + bytes = (key->key_size + 7) / 8; + if (bytes > HMAC_LEN) { + bytes = HMAC_LEN; + key->key_size = HMAC_LEN * 8; + } + + memset(data, 0, HMAC_LEN); + ret = dst__entropy_getdata(data, bytes, ISC_TF(pseudorandom_ok != 0)); + + if (ret != ISC_R_SUCCESS) + return (ret); + + isc_buffer_init(&b, data, bytes); + isc_buffer_add(&b, bytes); + ret = hmacsha384_fromdns(key, &b); + memset(data, 0, ISC_SHA384_DIGESTLENGTH); + + return (ret); +} + +static isc_boolean_t +hmacsha384_isprivate(const dst_key_t *key) { + UNUSED(key); + return (ISC_TRUE); +} + +static void +hmacsha384_destroy(dst_key_t *key) { + dst_hmacsha384_key_t *hkey = key->keydata.hmacsha384; + memset(hkey, 0, sizeof(dst_hmacsha384_key_t)); + isc_mem_put(key->mctx, hkey, sizeof(dst_hmacsha384_key_t)); + key->keydata.hmacsha384 = NULL; +} + +static isc_result_t +hmacsha384_todns(const dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha384_key_t *hkey; + unsigned int bytes; + + REQUIRE(key->keydata.hmacsha384 != NULL); + + hkey = key->keydata.hmacsha384; + + bytes = (key->key_size + 7) / 8; + if (isc_buffer_availablelength(data) < bytes) + return (ISC_R_NOSPACE); + isc_buffer_putmem(data, hkey->key, bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha384_fromdns(dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha384_key_t *hkey; + int keylen; + isc_region_t r; + isc_sha384_t sha384ctx; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + hkey = isc_mem_get(key->mctx, sizeof(dst_hmacsha384_key_t)); + if (hkey == NULL) + return (ISC_R_NOMEMORY); + + memset(hkey->key, 0, sizeof(hkey->key)); + + if (r.length > ISC_SHA384_DIGESTLENGTH) { + isc_sha384_init(&sha384ctx); + isc_sha384_update(&sha384ctx, r.base, r.length); + isc_sha384_final(hkey->key, &sha384ctx); + keylen = ISC_SHA384_DIGESTLENGTH; + } + else { + memcpy(hkey->key, r.base, r.length); + keylen = r.length; + } + + key->key_size = keylen * 8; + key->keydata.hmacsha384 = hkey; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha384_tofile(const dst_key_t *key, const char *directory) { + int cnt = 0; + dst_hmacsha384_key_t *hkey; + dst_private_t priv; + int bytes = (key->key_size + 7) / 8; + unsigned char buf[2]; + + if (key->keydata.hmacsha384 == NULL) + return (DST_R_NULLKEY); + + hkey = key->keydata.hmacsha384; + + priv.elements[cnt].tag = TAG_HMACSHA384_KEY; + priv.elements[cnt].length = bytes; + priv.elements[cnt++].data = hkey->key; + + buf[0] = (key->key_bits >> 8) & 0xffU; + buf[1] = key->key_bits & 0xffU; + priv.elements[cnt].tag = TAG_HMACSHA384_BITS; + priv.elements[cnt].data = buf; + priv.elements[cnt++].length = 2; + + priv.nelements = cnt; + return (dst__privstruct_writefile(key, &priv, directory)); +} + +static isc_result_t +hmacsha384_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t result, tresult; + isc_buffer_t b; + isc_mem_t *mctx = key->mctx; + unsigned int i; + + /* read private key file */ + result = dst__privstruct_parse(key, DST_ALG_HMACSHA384, lexer, mctx, + &priv); + if (result != ISC_R_SUCCESS) + return (result); + + key->key_bits = 0; + for (i = 0; i < priv.nelements; i++) { + switch (priv.elements[i].tag) { + case TAG_HMACSHA384_KEY: + isc_buffer_init(&b, priv.elements[i].data, + priv.elements[i].length); + isc_buffer_add(&b, priv.elements[i].length); + tresult = hmacsha384_fromdns(key, &b); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + case TAG_HMACSHA384_BITS: + tresult = getkeybits(key, &priv.elements[i]); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + default: + result = DST_R_INVALIDPRIVATEKEY; + break; + } + } + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (result); +} + +static dst_func_t hmacsha384_functions = { + hmacsha384_createctx, + hmacsha384_destroyctx, + hmacsha384_adddata, + hmacsha384_sign, + hmacsha384_verify, + NULL, /* computesecret */ + hmacsha384_compare, + NULL, /* paramcompare */ + hmacsha384_generate, + hmacsha384_isprivate, + hmacsha384_destroy, + hmacsha384_todns, + hmacsha384_fromdns, + hmacsha384_tofile, + hmacsha384_parse, + NULL, /* cleanup */ + NULL, /* fromlabel */ +}; + +isc_result_t +dst__hmacsha384_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &hmacsha384_functions; + return (ISC_R_SUCCESS); +} + +static isc_result_t hmacsha512_fromdns(dst_key_t *key, isc_buffer_t *data); + +struct dst_hmacsha512_key { + unsigned char key[ISC_SHA512_DIGESTLENGTH]; +}; + +static isc_result_t +hmacsha512_createctx(dst_key_t *key, dst_context_t *dctx) { + isc_hmacsha512_t *hmacsha512ctx; + dst_hmacsha512_key_t *hkey = key->keydata.hmacsha512; + + hmacsha512ctx = isc_mem_get(dctx->mctx, sizeof(isc_hmacsha512_t)); + if (hmacsha512ctx == NULL) + return (ISC_R_NOMEMORY); + isc_hmacsha512_init(hmacsha512ctx, hkey->key, ISC_SHA512_DIGESTLENGTH); + dctx->ctxdata.hmacsha512ctx = hmacsha512ctx; + return (ISC_R_SUCCESS); +} + +static void +hmacsha512_destroyctx(dst_context_t *dctx) { + isc_hmacsha512_t *hmacsha512ctx = dctx->ctxdata.hmacsha512ctx; + + if (hmacsha512ctx != NULL) { + isc_hmacsha512_invalidate(hmacsha512ctx); + isc_mem_put(dctx->mctx, hmacsha512ctx, sizeof(isc_hmacsha512_t)); + dctx->ctxdata.hmacsha512ctx = NULL; + } +} + +static isc_result_t +hmacsha512_adddata(dst_context_t *dctx, const isc_region_t *data) { + isc_hmacsha512_t *hmacsha512ctx = dctx->ctxdata.hmacsha512ctx; + + isc_hmacsha512_update(hmacsha512ctx, data->base, data->length); + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha512_sign(dst_context_t *dctx, isc_buffer_t *sig) { + isc_hmacsha512_t *hmacsha512ctx = dctx->ctxdata.hmacsha512ctx; + unsigned char *digest; + + if (isc_buffer_availablelength(sig) < ISC_SHA512_DIGESTLENGTH) + return (ISC_R_NOSPACE); + digest = isc_buffer_used(sig); + isc_hmacsha512_sign(hmacsha512ctx, digest, ISC_SHA512_DIGESTLENGTH); + isc_buffer_add(sig, ISC_SHA512_DIGESTLENGTH); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha512_verify(dst_context_t *dctx, const isc_region_t *sig) { + isc_hmacsha512_t *hmacsha512ctx = dctx->ctxdata.hmacsha512ctx; + + if (sig->length > ISC_SHA512_DIGESTLENGTH || sig->length == 0) + return (DST_R_VERIFYFAILURE); + + if (isc_hmacsha512_verify(hmacsha512ctx, sig->base, sig->length)) + return (ISC_R_SUCCESS); + else + return (DST_R_VERIFYFAILURE); +} + +static isc_boolean_t +hmacsha512_compare(const dst_key_t *key1, const dst_key_t *key2) { + dst_hmacsha512_key_t *hkey1, *hkey2; + + hkey1 = key1->keydata.hmacsha512; + hkey2 = key2->keydata.hmacsha512; + + if (hkey1 == NULL && hkey2 == NULL) + return (ISC_TRUE); + else if (hkey1 == NULL || hkey2 == NULL) + return (ISC_FALSE); + + if (memcmp(hkey1->key, hkey2->key, ISC_SHA512_DIGESTLENGTH) == 0) + return (ISC_TRUE); + else + return (ISC_FALSE); +} + +static isc_result_t +hmacsha512_generate(dst_key_t *key, int pseudorandom_ok) { + isc_buffer_t b; + isc_result_t ret; + int bytes; + unsigned char data[HMAC_LEN]; + + bytes = (key->key_size + 7) / 8; + if (bytes > HMAC_LEN) { + bytes = HMAC_LEN; + key->key_size = HMAC_LEN * 8; + } + + memset(data, 0, HMAC_LEN); + ret = dst__entropy_getdata(data, bytes, ISC_TF(pseudorandom_ok != 0)); + + if (ret != ISC_R_SUCCESS) + return (ret); + + isc_buffer_init(&b, data, bytes); + isc_buffer_add(&b, bytes); + ret = hmacsha512_fromdns(key, &b); + memset(data, 0, ISC_SHA512_DIGESTLENGTH); + + return (ret); +} + +static isc_boolean_t +hmacsha512_isprivate(const dst_key_t *key) { + UNUSED(key); + return (ISC_TRUE); +} + +static void +hmacsha512_destroy(dst_key_t *key) { + dst_hmacsha512_key_t *hkey = key->keydata.hmacsha512; + memset(hkey, 0, sizeof(dst_hmacsha512_key_t)); + isc_mem_put(key->mctx, hkey, sizeof(dst_hmacsha512_key_t)); + key->keydata.hmacsha512 = NULL; +} + +static isc_result_t +hmacsha512_todns(const dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha512_key_t *hkey; + unsigned int bytes; + + REQUIRE(key->keydata.hmacsha512 != NULL); + + hkey = key->keydata.hmacsha512; + + bytes = (key->key_size + 7) / 8; + if (isc_buffer_availablelength(data) < bytes) + return (ISC_R_NOSPACE); + isc_buffer_putmem(data, hkey->key, bytes); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha512_fromdns(dst_key_t *key, isc_buffer_t *data) { + dst_hmacsha512_key_t *hkey; + int keylen; + isc_region_t r; + isc_sha512_t sha512ctx; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) + return (ISC_R_SUCCESS); + + hkey = isc_mem_get(key->mctx, sizeof(dst_hmacsha512_key_t)); + if (hkey == NULL) + return (ISC_R_NOMEMORY); + + memset(hkey->key, 0, sizeof(hkey->key)); + + if (r.length > ISC_SHA512_DIGESTLENGTH) { + isc_sha512_init(&sha512ctx); + isc_sha512_update(&sha512ctx, r.base, r.length); + isc_sha512_final(hkey->key, &sha512ctx); + keylen = ISC_SHA512_DIGESTLENGTH; + } + else { + memcpy(hkey->key, r.base, r.length); + keylen = r.length; + } + + key->key_size = keylen * 8; + key->keydata.hmacsha512 = hkey; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +hmacsha512_tofile(const dst_key_t *key, const char *directory) { + int cnt = 0; + dst_hmacsha512_key_t *hkey; + dst_private_t priv; + int bytes = (key->key_size + 7) / 8; + unsigned char buf[2]; + + if (key->keydata.hmacsha512 == NULL) + return (DST_R_NULLKEY); + + hkey = key->keydata.hmacsha512; + + priv.elements[cnt].tag = TAG_HMACSHA512_KEY; + priv.elements[cnt].length = bytes; + priv.elements[cnt++].data = hkey->key; + + buf[0] = (key->key_bits >> 8) & 0xffU; + buf[1] = key->key_bits & 0xffU; + priv.elements[cnt].tag = TAG_HMACSHA512_BITS; + priv.elements[cnt].data = buf; + priv.elements[cnt++].length = 2; + + priv.nelements = cnt; + return (dst__privstruct_writefile(key, &priv, directory)); +} + +static isc_result_t +hmacsha512_parse(dst_key_t *key, isc_lex_t *lexer) { + dst_private_t priv; + isc_result_t result, tresult; + isc_buffer_t b; + isc_mem_t *mctx = key->mctx; + unsigned int i; + + /* read private key file */ + result = dst__privstruct_parse(key, DST_ALG_HMACSHA512, lexer, mctx, + &priv); + if (result != ISC_R_SUCCESS) + return (result); + + key->key_bits = 0; + for (i = 0; i < priv.nelements; i++) { + switch (priv.elements[i].tag) { + case TAG_HMACSHA512_KEY: + isc_buffer_init(&b, priv.elements[i].data, + priv.elements[i].length); + isc_buffer_add(&b, priv.elements[i].length); + tresult = hmacsha512_fromdns(key, &b); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + case TAG_HMACSHA512_BITS: + tresult = getkeybits(key, &priv.elements[i]); + if (tresult != ISC_R_SUCCESS) + result = tresult; + break; + default: + result = DST_R_INVALIDPRIVATEKEY; + break; + } + } + dst__privstruct_free(&priv, mctx); + memset(&priv, 0, sizeof(priv)); + return (result); +} + +static dst_func_t hmacsha512_functions = { + hmacsha512_createctx, + hmacsha512_destroyctx, + hmacsha512_adddata, + hmacsha512_sign, + hmacsha512_verify, + NULL, /* computesecret */ + hmacsha512_compare, + NULL, /* paramcompare */ + hmacsha512_generate, + hmacsha512_isprivate, + hmacsha512_destroy, + hmacsha512_todns, + hmacsha512_fromdns, + hmacsha512_tofile, + hmacsha512_parse, + NULL, /* cleanup */ + NULL, /* fromlabel */ +}; + +isc_result_t +dst__hmacsha512_init(dst_func_t **funcp) { + REQUIRE(funcp != NULL); + if (*funcp == NULL) + *funcp = &hmacsha512_functions; + return (ISC_R_SUCCESS); +} + +/*! \file */ |