b0edda11cb
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5689)
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2017 Ribose Inc. All Rights Reserved.
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* Ported from Ribose contributions from Botan.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/sm2.h>
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#include <openssl/evp.h>
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#include <openssl/bn.h>
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#include <string.h>
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int SM2_compute_userid_digest(uint8_t *out,
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const EVP_MD *digest,
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const char *user_id,
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const EC_KEY *key)
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{
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int rc = 0;
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const EC_GROUP *group = EC_KEY_get0_group(key);
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BN_CTX *ctx = NULL;
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EVP_MD_CTX *hash = NULL;
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BIGNUM *p = NULL;
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BIGNUM *a = NULL;
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BIGNUM *b = NULL;
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BIGNUM *xG = NULL;
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BIGNUM *yG = NULL;
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BIGNUM *xA = NULL;
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BIGNUM *yA = NULL;
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int p_bytes = 0;
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uint8_t *buf = NULL;
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size_t uid_len = 0;
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uint16_t entla = 0;
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uint8_t e_byte = 0;
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hash = EVP_MD_CTX_new();
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if (hash == NULL)
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goto done;
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ctx = BN_CTX_new();
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if (ctx == NULL)
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goto done;
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p = BN_CTX_get(ctx);
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a = BN_CTX_get(ctx);
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b = BN_CTX_get(ctx);
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xG = BN_CTX_get(ctx);
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yG = BN_CTX_get(ctx);
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xA = BN_CTX_get(ctx);
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yA = BN_CTX_get(ctx);
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if (p == NULL || a == NULL || b == NULL ||
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xG == NULL || yG == NULL || xA == NULL || yA == NULL)
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goto done;
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memset(out, 0, EVP_MD_size(digest));
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if (EVP_DigestInit(hash, digest) == 0)
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goto done;
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/*
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ZA=H256(ENTLA || IDA || a || b || xG || yG || xA || yA)
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*/
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uid_len = strlen(user_id);
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if (uid_len >= 8192) /* too large */
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goto done;
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entla = (unsigned short)(8 * uid_len);
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e_byte = entla >> 8;
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if (EVP_DigestUpdate(hash, &e_byte, 1) == 0)
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goto done;
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e_byte = entla & 0xFF;
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if (EVP_DigestUpdate(hash, &e_byte, 1) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, user_id, uid_len) == 0)
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goto done;
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if (EC_GROUP_get_curve_GFp(group, p, a, b, ctx) == 0)
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goto done;
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p_bytes = BN_num_bytes(p);
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buf = OPENSSL_zalloc(p_bytes);
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BN_bn2binpad(a, buf, p_bytes);
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if (EVP_DigestUpdate(hash, buf, p_bytes) == 0)
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goto done;
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BN_bn2binpad(b, buf, p_bytes);
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if (EVP_DigestUpdate(hash, buf, p_bytes) == 0)
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goto done;
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EC_POINT_get_affine_coordinates_GFp(group,
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EC_GROUP_get0_generator(group),
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xG, yG, ctx);
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BN_bn2binpad(xG, buf, p_bytes);
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if (EVP_DigestUpdate(hash, buf, p_bytes) == 0)
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goto done;
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BN_bn2binpad(yG, buf, p_bytes);
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if (EVP_DigestUpdate(hash, buf, p_bytes) == 0)
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goto done;
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EC_POINT_get_affine_coordinates_GFp(group,
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EC_KEY_get0_public_key(key),
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xA, yA, ctx);
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BN_bn2binpad(xA, buf, p_bytes);
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if (EVP_DigestUpdate(hash, buf, p_bytes) == 0)
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goto done;
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BN_bn2binpad(yA, buf, p_bytes);
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if (EVP_DigestUpdate(hash, buf, p_bytes) == 0)
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goto done;
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if (EVP_DigestFinal(hash, out, NULL) == 0)
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goto done;
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rc = 1;
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done:
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OPENSSL_free(buf);
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BN_CTX_free(ctx);
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EVP_MD_CTX_free(hash);
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return rc;
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}
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