GmSSL/crypto/kdf2/kdf_ibcs.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/kdf2.h>

static void *ibcs_kdf(const EVP_MD *md, const void *in, size_t inlen,
	void *out, size_t *outlen)
{
	unsigned char state[EVP_MAX_MD_SIZE * 2];
	unsigned char dgst[EVP_MAX_MD_SIZE];
	unsigned int dgstlen;
	size_t rlen;
	unsigned char *pout;
	int i;

	dgstlen = EVP_MD_size(md);
	memset(state, 0, dgstlen);
	if (!EVP_Digest(in, inlen, state + dgstlen, &dgstlen, md, NULL)) {
		KDF2err(KDF2_F_IBCS_KDF, KDF2_R_DIGEST_FAILURE);
		return NULL;
	}

	rlen = *outlen;
	pout = out;
	for (i = 0; i < (*outlen + dgstlen - 1)/dgstlen; i++) {
		size_t len;

		if (!EVP_Digest(state, dgstlen, state, &dgstlen, md, NULL)) {
			KDF2err(KDF2_F_IBCS_KDF, KDF2_R_DIGEST_FAILURE);
			return NULL;
		}
		if (!EVP_Digest(state, dgstlen*2, dgst, &dgstlen, md, NULL)) {
			KDF2err(KDF2_F_IBCS_KDF, KDF2_R_DIGEST_FAILURE);
			return NULL;
		}

		len = (dgstlen <= rlen) ? dgstlen : rlen;
		memcpy(pout, dgst, len);
		pout += len;
		rlen -= len;
	}

	return out;
}

#define IMPLEMENT_IBCS_KDF(md) \
static void *ibcs_##md##kdf(const void *in, size_t inlen, void *out, size_t *outlen) { \
	return ibcs_kdf(EVP_##md(), in, inlen, out, outlen); \
}

IMPLEMENT_IBCS_KDF(sm3)
#ifndef OPENSSL_NO_MD5
IMPLEMENT_IBCS_KDF(md5)
#endif
#ifndef OPENSSL_NO_BLAKE2
IMPLEMENT_IBCS_KDF(blake2b512)
IMPLEMENT_IBCS_KDF(blake2s256)
#endif
IMPLEMENT_IBCS_KDF(sha1)
IMPLEMENT_IBCS_KDF(sha224)
IMPLEMENT_IBCS_KDF(sha256)
IMPLEMENT_IBCS_KDF(sha384)
IMPLEMENT_IBCS_KDF(sha512)
#ifndef OPENSSL_NO_MDC2
IMPLEMENT_IBCS_KDF(mdc2)
#endif
#ifndef OPENSSL_NO_RMD160
IMPLEMENT_IBCS_KDF(ripemd160)
#endif
#ifndef OPENSSL_NO_WHIRLPOOL
IMPLEMENT_IBCS_KDF(whirlpool)
#endif

KDF_FUNC KDF_get_ibcs(const EVP_MD *md)
{
	switch (EVP_MD_type(md)) {
	case NID_sm3:
		return ibcs_sm3kdf;
#ifndef OPENSSL_NO_MD5
	case NID_md5:
		return ibcs_md5kdf;
#endif
#ifndef OPENSSL_NO_BLAKE2
	case NID_blake2b512:
		return ibcs_blake2s256kdf;
	case NID_blake2s256:
		return ibcs_blake2s256kdf;
#endif
	case NID_sha1:
		return ibcs_sha1kdf;
	case NID_sha224:
		return ibcs_sha224kdf;
	case NID_sha256:
		return ibcs_sha256kdf;
	case NID_sha384:
		return ibcs_sha384kdf;
	case NID_sha512:
		return ibcs_sha512kdf;
#ifndef OPENSSL_NO_MDC2
	case NID_mdc2:
		return ibcs_mdc2kdf;
#endif
#ifndef OPENSSL_NO_RMD160
	case NID_ripemd160:
		return ibcs_ripemd160kdf;
#endif
#ifndef OPENSSL_NO_WHIRLPOOL
	case NID_whirlpool:
		return ibcs_whirlpoolkdf;
#endif
	}

	return NULL;
}