ecc_sign+verify_hash_raw > ecc_sign+verify_hash_rfc7518
This commit is contained in:
Karel Miko
parent
c14bcf4d30
commit
67200b641d
@ -314,15 +314,15 @@ int ecc_decrypt_key(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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ecc_key *key);
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int ecc_sign_hash_raw(const unsigned char *in, unsigned long inlen,
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void *r, void *s,
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int ecc_sign_hash_rfc7518(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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prng_state *prng, int wprng, ecc_key *key);
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int ecc_sign_hash(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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prng_state *prng, int wprng, ecc_key *key);
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int ecc_verify_hash_raw( void *r, void *s,
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int ecc_verify_hash_rfc7518(const unsigned char *sig, unsigned long siglen,
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const unsigned char *hash, unsigned long hashlen,
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int *stat, ecc_key *key);
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@ -7,42 +7,28 @@
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* guarantee it works.
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*/
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/* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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*
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* All curves taken from NIST recommendation paper of July 1999
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* Available at http://csrc.nist.gov/cryptval/dss.htm
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MECC
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/**
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@file ecc_sign_hash.c
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ECC Crypto, Tom St Denis
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*/
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#ifdef LTC_MECC
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/**
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Sign a hash with ECC
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@param in The hash to sign
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@param inlen The length of the hash to sign
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@param r The "r" integer of the signature (caller must initialize with mp_init() first)
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@param s The "s" integer of the signature (caller must initialize with mp_init() first)
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@param prng An active PRNG state
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@param wprng The index of the PRNG desired
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@param key A private ECC key
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@return CRYPT_OK if successful
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*/
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int ecc_sign_hash_raw(const unsigned char *in, unsigned long inlen,
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void *r, void *s,
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prng_state *prng, int wprng, ecc_key *key)
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static int ecc_sign_hash_ex(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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prng_state *prng, int wprng, ecc_key *key, int sigformat)
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{
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ecc_key pubkey;
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void *e, *p;
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void *r, *s, *e, *p;
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int err;
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unsigned long pbits, pbytes, i, shift_right;
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unsigned char ch, buf[MAXBLOCKSIZE];
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(r != NULL);
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LTC_ARGCHK(s != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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/* is this a private key? */
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@ -59,13 +45,30 @@ int ecc_sign_hash_raw(const unsigned char *in, unsigned long inlen,
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return err;
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}
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/* get the hash and load it as a bignum into 'e' */
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/* init the bignums */
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if ((err = mp_init_multi(&p, &e, NULL)) != CRYPT_OK) {
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if ((err = mp_init_multi(&r, &s, &p, &e, NULL)) != CRYPT_OK) {
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return err;
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}
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if ((err = mp_read_radix(p, (char *)key->dp->order, 16)) != CRYPT_OK) { goto errnokey; }
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, (int)inlen)) != CRYPT_OK) { goto errnokey; }
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/* get the hash and load it as a bignum into 'e' */
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pbits = mp_count_bits(p);
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pbytes = (pbits+7) >> 3;
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if (pbits > inlen*8) {
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, inlen)) != CRYPT_OK) { goto errnokey; }
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}
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else if (pbits % 8 == 0) {
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, pbytes)) != CRYPT_OK) { goto errnokey; }
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}
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else {
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shift_right = 8 - pbits % 8;
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for (i=0, ch=0; i<pbytes; i++) {
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buf[i] = ch;
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ch = (in[i] << (8-shift_right));
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buf[i] = buf[i] ^ (in[i] >> shift_right);
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}
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)buf, pbytes)) != CRYPT_OK) { goto errnokey; }
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}
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/* make up a key and export the public copy */
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for (;;) {
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@ -92,13 +95,29 @@ int ecc_sign_hash_raw(const unsigned char *in, unsigned long inlen,
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}
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}
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if (sigformat == 1) {
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/* RFC7518 format */
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if (*outlen < 2*pbytes) { err = CRYPT_MEM; goto errnokey; }
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zeromem(out, 2*pbytes);
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i = mp_unsigned_bin_size(r);
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if ((err = mp_to_unsigned_bin(r, out + (pbytes - i))) != CRYPT_OK) { goto errnokey; }
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i = mp_unsigned_bin_size(s);
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if ((err = mp_to_unsigned_bin(s, out + (2*pbytes - i))) != CRYPT_OK) { goto errnokey; }
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*outlen = 2*pbytes;
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err = CRYPT_OK;
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}
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else {
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/* store as ASN.1 SEQUENCE { r, s -- integer } */
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err = der_encode_sequence_multi(out, outlen,
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LTC_ASN1_INTEGER, 1UL, r,
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LTC_ASN1_INTEGER, 1UL, s,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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goto errnokey;
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error:
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ecc_free(&pubkey);
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errnokey:
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mp_clear_multi(p, e, NULL);
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mp_clear_multi(r, s, p, e, NULL);
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return err;
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}
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@ -117,35 +136,29 @@ int ecc_sign_hash(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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prng_state *prng, int wprng, ecc_key *key)
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{
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void *r, *s;
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int err;
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return ecc_sign_hash_ex(in, inlen, out, outlen, prng, wprng, key, 0);
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}
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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if (mp_init_multi(&r, &s, NULL) != CRYPT_OK) {
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return CRYPT_MEM;
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}
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if ((err = ecc_sign_hash_raw(in, inlen, r, s, prng, wprng, key)) != CRYPT_OK) {
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goto error;
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}
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/* store as SEQUENCE { r, s -- integer } */
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err = der_encode_sequence_multi(out, outlen,
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LTC_ASN1_INTEGER, 1UL, r,
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LTC_ASN1_INTEGER, 1UL, s,
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LTC_ASN1_EOL, 0UL, NULL);
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error:
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mp_clear_multi(r, s, NULL);
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return err;
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/**
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Sign a message digest in RFC7518 format
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@param in The message digest to sign
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@param inlen The length of the digest
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@param out [out] The destination for the signature
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@param outlen [in/out] The max size and resulting size of the signature
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@param prng An active PRNG state
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@param wprng The index of the PRNG you wish to use
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@param key A private ECC key
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@return CRYPT_OK if successful
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*/
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int ecc_sign_hash_rfc7518(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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prng_state *prng, int wprng, ecc_key *key)
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{
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return ecc_sign_hash_ex(in, inlen, out, outlen, prng, wprng, key, 1);
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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@ -7,51 +7,27 @@
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* guarantee it works.
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*/
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/* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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*
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* All curves taken from NIST recommendation paper of July 1999
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* Available at http://csrc.nist.gov/cryptval/dss.htm
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MECC
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/**
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@file ecc_verify_hash.c
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ECC Crypto, Tom St Denis
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*/
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#ifdef LTC_MECC
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/* verify
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*
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* w = s^-1 mod n
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* u1 = xw
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* u2 = rw
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* X = u1*G + u2*Q
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* v = X_x1 mod n
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* accept if v == r
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*/
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/**
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Verify a ECC signature
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@param r ECC "r" parameter
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@param s ECC "s" parameter
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@param hash The hash that was signed
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@param hashlen The length of the hash that was signed
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@param stat [out] The result of the signature verification, 1==valid, 0==invalid
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@param key The corresponding public DH key
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@return CRYPT_OK if successful (even if the signature is invalid)
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*/
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int ecc_verify_hash_raw( void *r, void *s,
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static int ecc_verify_hash_ex(const unsigned char *sig, unsigned long siglen,
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const unsigned char *hash, unsigned long hashlen,
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int *stat, ecc_key *key)
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int *stat, ecc_key *key, int sigformat)
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{
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ecc_point *mG, *mQ;
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void *v, *w, *u1, *u2, *e, *p, *m;
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void *mp = NULL;
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void *r, *s, *v, *w, *u1, *u2, *e, *p, *m;
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void *mp;
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int err;
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unsigned long pbits, pbytes, i, shift_right;
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unsigned char ch, buf[MAXBLOCKSIZE];
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LTC_ARGCHK(r != NULL);
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LTC_ARGCHK(s != NULL);
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LTC_ARGCHK(sig != NULL);
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LTC_ARGCHK(hash != NULL);
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LTC_ARGCHK(stat != NULL);
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LTC_ARGCHK(key != NULL);
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@ -66,7 +42,7 @@ int ecc_verify_hash_raw( void *r, void *s,
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}
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/* allocate ints */
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if ((err = mp_init_multi(&v, &w, &u1, &u2, &p, &e, &m, NULL)) != CRYPT_OK) {
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if ((err = mp_init_multi(&r, &s, &v, &w, &u1, &u2, &p, &e, &m, NULL)) != CRYPT_OK) {
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return CRYPT_MEM;
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}
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@ -78,6 +54,24 @@ int ecc_verify_hash_raw( void *r, void *s,
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goto error;
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}
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if (sigformat == 1) {
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/* RFC7518 format */
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if ((siglen % 2) == 1) {
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err = CRYPT_INVALID_PACKET;
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goto error;
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}
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i = siglen / 2;
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if ((err = mp_read_unsigned_bin(r, (unsigned char *)sig, i)) != CRYPT_OK) { goto error; }
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if ((err = mp_read_unsigned_bin(s, (unsigned char *)sig+i, i)) != CRYPT_OK) { goto error; }
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}
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else {
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/* ASN.1 format */
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if ((err = der_decode_sequence_multi(sig, siglen,
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LTC_ASN1_INTEGER, 1UL, r,
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LTC_ASN1_INTEGER, 1UL, s,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { goto error; }
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}
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/* get the order */
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if ((err = mp_read_radix(p, (char *)key->dp->order, 16)) != CRYPT_OK) { goto error; }
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@ -90,8 +84,24 @@ int ecc_verify_hash_raw( void *r, void *s,
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goto error;
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}
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/* read hash */
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)hash, (int)hashlen)) != CRYPT_OK) { goto error; }
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/* read hash - truncate if needed */
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pbits = mp_count_bits(p);
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pbytes = (pbits+7) >> 3;
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if (pbits > hashlen*8) {
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)hash, hashlen)) != CRYPT_OK) { goto error; }
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}
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else if (pbits % 8 == 0) {
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)hash, pbytes)) != CRYPT_OK) { goto error; }
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}
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else {
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shift_right = 8 - pbits % 8;
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for (i=0, ch=0; i<pbytes; i++) {
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buf[i] = ch;
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ch = (hash[i] << (8-shift_right));
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buf[i] = buf[i] ^ (hash[i] >> shift_right);
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}
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if ((err = mp_read_unsigned_bin(e, (unsigned char *)buf, pbytes)) != CRYPT_OK) { goto error; }
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}
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/* w = s^-1 mod n */
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if ((err = mp_invmod(s, p, w)) != CRYPT_OK) { goto error; }
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@ -116,9 +126,6 @@ int ecc_verify_hash_raw( void *r, void *s,
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if ((err = ltc_mp.ecc_ptmul(u1, mG, mG, m, 0)) != CRYPT_OK) { goto error; }
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if ((err = ltc_mp.ecc_ptmul(u2, mQ, mQ, m, 0)) != CRYPT_OK) { goto error; }
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/* find the montgomery mp */
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if ((err = mp_montgomery_setup(m, &mp)) != CRYPT_OK) { goto error; }
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/* add them */
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if ((err = ltc_mp.ecc_ptadd(mQ, mG, mG, m, mp)) != CRYPT_OK) { goto error; }
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@ -142,7 +149,7 @@ int ecc_verify_hash_raw( void *r, void *s,
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error:
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ltc_ecc_del_point(mG);
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ltc_ecc_del_point(mQ);
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mp_clear_multi(v, w, u1, u2, p, e, m, NULL);
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mp_clear_multi(r, s, v, w, u1, u2, p, e, m, NULL);
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if (mp != NULL) {
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mp_montgomery_free(mp);
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}
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@ -159,42 +166,32 @@ error:
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@param key The corresponding public ECC key
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@return CRYPT_OK if successful (even if the signature is not valid)
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*/
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int ecc_verify_hash(const unsigned char *sig, unsigned long siglen,
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const unsigned char *hash, unsigned long hashlen,
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int *stat, ecc_key *key)
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{
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void *r, *s;
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int err;
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return ecc_verify_hash_ex(sig, siglen, hash, hashlen, stat, key, 0);
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}
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LTC_ARGCHK(sig != NULL);
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LTC_ARGCHK(hash != NULL);
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LTC_ARGCHK(stat != NULL);
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LTC_ARGCHK(key != NULL);
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/* allocate ints */
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if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
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return CRYPT_MEM;
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}
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/* parse header */
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if ((err = der_decode_sequence_multi(sig, siglen,
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LTC_ASN1_INTEGER, 1UL, r,
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LTC_ASN1_INTEGER, 1UL, s,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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goto error;
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}
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/* do the op */
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err = ecc_verify_hash_raw(r, s, hash, hashlen, stat, key);
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error:
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mp_clear_multi(r, s, NULL);
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return err;
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/**
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Verify an ECC signature in RFC7518 format
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@param sig The signature to verify
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@param siglen The length of the signature (octets)
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@param hash The hash (message digest) that was signed
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@param hashlen The length of the hash (octets)
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@param stat Result of signature, 1==valid, 0==invalid
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@param key The corresponding public ECC key
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@return CRYPT_OK if successful (even if the signature is not valid)
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*/
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int ecc_verify_hash_rfc7518(const unsigned char *sig, unsigned long siglen,
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const unsigned char *hash, unsigned long hashlen,
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int *stat, ecc_key *key)
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{
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return ecc_verify_hash_ex(sig, siglen, hash, hashlen, stat, key, 1);
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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