Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/rsa/rsa_oaep.c

Index: openssl/crypto/rsa/rsa_oaep.c
diff --git a/openssl/crypto/rsa/rsa_oaep.c b/openssl/crypto/rsa/rsa_oaep.c
deleted file mode 100644
index af4d24a56ef5918def4e19e914901f5163ad48d5..0000000000000000000000000000000000000000
--- a/openssl/crypto/rsa/rsa_oaep.c
+++ /dev/null
@@ -1,235 +0,0 @@
-/* crypto/rsa/rsa_oaep.c */
-/* Written by Ulf Moeller. This software is distributed on an "AS IS"
-   basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. */
-
-/* EME-OAEP as defined in RFC 2437 (PKCS #1 v2.0) */
-
-/* See Victor Shoup, "OAEP reconsidered," Nov. 2000,
- * <URL: http://www.shoup.net/papers/oaep.ps.Z>
- * for problems with the security proof for the
- * original OAEP scheme, which EME-OAEP is based on.
- * 
- * A new proof can be found in E. Fujisaki, T. Okamoto,
- * D. Pointcheval, J. Stern, "RSA-OEAP is Still Alive!",
- * Dec. 2000, <URL: http://eprint.iacr.org/2000/061/>.
- * The new proof has stronger requirements for the
- * underlying permutation: "partial-one-wayness" instead
- * of one-wayness.  For the RSA function, this is
- * an equivalent notion.
- */
-
-
-#if !defined(OPENSSL_NO_SHA) && !defined(OPENSSL_NO_SHA1)
-#include <stdio.h>
-#include "cryptlib.h"
-#include <openssl/bn.h>
-#include <openssl/rsa.h>
-#include <openssl/evp.h>
-#include <openssl/rand.h>
-#include <openssl/sha.h>
-
-static int MGF1(unsigned char *mask, long len,
-	const unsigned char *seed, long seedlen);
-
-int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
-	const unsigned char *from, int flen,
-	const unsigned char *param, int plen)
-	{
-	int i, emlen = tlen - 1;
-	unsigned char *db, *seed;
-	unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
-
-	if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
-		{
-		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
-		   RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
-		return 0;
-		}
-
-	if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
-		{
-		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL);
-		return 0;
-		}
-
-	to[0] = 0;
-	seed = to + 1;
-	db = to + SHA_DIGEST_LENGTH + 1;
-
-	if (!EVP_Digest((void *)param, plen, db, NULL, EVP_sha1(), NULL))
-		return 0;
-	memset(db + SHA_DIGEST_LENGTH, 0,
-		emlen - flen - 2 * SHA_DIGEST_LENGTH - 1);
-	db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
-	memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen);
-	if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0)
-		return 0;
-#ifdef PKCS_TESTVECT
-	memcpy(seed,
-	   "\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f",
-	   20);
-#endif
-
-	dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH);
-	if (dbmask == NULL)
-		{
-		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
-		return 0;
-		}
-
-	if (MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH) < 0)
-		return 0;
-	for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
-		db[i] ^= dbmask[i];
-
-	if (MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH) < 0)
-		return 0;
-	for (i = 0; i < SHA_DIGEST_LENGTH; i++)
-		seed[i] ^= seedmask[i];
-
-	OPENSSL_free(dbmask);
-	return 1;
-	}
-
-int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
-	const unsigned char *from, int flen, int num,
-	const unsigned char *param, int plen)
-	{
-	int i, dblen, mlen = -1;
-	const unsigned char *maskeddb;
-	int lzero;
-	unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
-	unsigned char *padded_from;
-	int bad = 0;
-
-	if (--num < 2 * SHA_DIGEST_LENGTH + 1)
-		/* 'num' is the length of the modulus, i.e. does not depend on the
-		 * particular ciphertext. */
-		goto decoding_err;
-
-	lzero = num - flen;
-	if (lzero < 0)
-		{
-		/* signalling this error immediately after detection might allow
-		 * for side-channel attacks (e.g. timing if 'plen' is huge
-		 * -- cf. James H. Manger, "A Chosen Ciphertext Attack on RSA Optimal
-		 * Asymmetric Encryption Padding (OAEP) [...]", CRYPTO 2001),
-		 * so we use a 'bad' flag */
-		bad = 1;
-		lzero = 0;
-		flen = num; /* don't overflow the memcpy to padded_from */
-		}
-
-	dblen = num - SHA_DIGEST_LENGTH;
-	db = OPENSSL_malloc(dblen + num);
-	if (db == NULL)
-		{
-		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
-		return -1;
-		}
-
-	/* Always do this zero-padding copy (even when lzero == 0)
-	 * to avoid leaking timing info about the value of lzero. */
-	padded_from = db + dblen;
-	memset(padded_from, 0, lzero);
-	memcpy(padded_from + lzero, from, flen);
-
-	maskeddb = padded_from + SHA_DIGEST_LENGTH;
-
-	if (MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen))
-		return -1;
-	for (i = 0; i < SHA_DIGEST_LENGTH; i++)
-		seed[i] ^= padded_from[i];
-  
-	if (MGF1(db, dblen, seed, SHA_DIGEST_LENGTH))
-		return -1;
-	for (i = 0; i < dblen; i++)
-		db[i] ^= maskeddb[i];
-
-	if (!EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1(), NULL))
-		return -1;
-
-	if (CRYPTO_memcmp(db, phash, SHA_DIGEST_LENGTH) != 0 || bad)
-		goto decoding_err;
-	else
-		{
-		for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
-			if (db[i] != 0x00)
-				break;
-		if (i == dblen || db[i] != 0x01)
-			goto decoding_err;
-		else
-			{
-			/* everything looks OK */
-
-			mlen = dblen - ++i;
-			if (tlen < mlen)
-				{
-				RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
-				mlen = -1;
-				}
-			else
-				memcpy(to, db + i, mlen);
-			}
-		}
-	OPENSSL_free(db);
-	return mlen;
-
-decoding_err:
-	/* to avoid chosen ciphertext attacks, the error message should not reveal
-	 * which kind of decoding error happened */
-	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
-	if (db != NULL) OPENSSL_free(db);
-	return -1;
-	}
-
-int PKCS1_MGF1(unsigned char *mask, long len,
-	const unsigned char *seed, long seedlen, const EVP_MD *dgst)
-	{
-	long i, outlen = 0;
-	unsigned char cnt[4];
-	EVP_MD_CTX c;
-	unsigned char md[EVP_MAX_MD_SIZE];
-	int mdlen;
-	int rv = -1;
-
-	EVP_MD_CTX_init(&c);
-	mdlen = EVP_MD_size(dgst);
-	if (mdlen < 0)
-		goto err;
-	for (i = 0; outlen < len; i++)
-		{
-		cnt[0] = (unsigned char)((i >> 24) & 255);
-		cnt[1] = (unsigned char)((i >> 16) & 255);
-		cnt[2] = (unsigned char)((i >> 8)) & 255;
-		cnt[3] = (unsigned char)(i & 255);
-		if (!EVP_DigestInit_ex(&c,dgst, NULL)
-			|| !EVP_DigestUpdate(&c, seed, seedlen)
-			|| !EVP_DigestUpdate(&c, cnt, 4))
-			goto err;
-		if (outlen + mdlen <= len)
-			{
-			if (!EVP_DigestFinal_ex(&c, mask + outlen, NULL))
-				goto err;
-			outlen += mdlen;
-			}
-		else
-			{
-			if (!EVP_DigestFinal_ex(&c, md, NULL))
-				goto err;
-			memcpy(mask + outlen, md, len - outlen);
-			outlen = len;
-			}
-		}
-	rv = 0;
-	err:
-	EVP_MD_CTX_cleanup(&c);
-	return rv;
-	}
-
-static int MGF1(unsigned char *mask, long len, const unsigned char *seed,
-		 long seedlen)
-	{
-	return PKCS1_MGF1(mask, len, seed, seedlen, EVP_sha1());
-	}
-#endif