From e1a4814cd4805b5c80cb6ea5adc3e888bb447e0d Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bodo=20M=C3=B6ller?= Date: Thu, 6 Sep 2001 09:30:16 +0000 Subject: [PATCH] fix formatting so that the file can be view with any tab-width --- crypto/rsa/rsa_oaep.c | 258 +++++++++++++++++++++--------------------- 1 file changed, 129 insertions(+), 129 deletions(-) diff --git a/crypto/rsa/rsa_oaep.c b/crypto/rsa/rsa_oaep.c index d8bc91e44d..62d2ed7e9f 100644 --- a/crypto/rsa/rsa_oaep.c +++ b/crypto/rsa/rsa_oaep.c @@ -34,158 +34,158 @@ int MGF1(unsigned char *mask, long len, 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); - } + int i, emlen = tlen - 1; + unsigned char *db, *seed; + unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH]; - if (emlen < 2 * SHA_DIGEST_LENGTH + 1) - { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL); - return (0); - } - - 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 (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); + } - to[0] = 0; - seed = to + 1; - db = to + SHA_DIGEST_LENGTH + 1; - - EVP_Digest((void *)param, plen, db, NULL, EVP_sha1()); - 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); + if (emlen < 2 * SHA_DIGEST_LENGTH + 1) + { + RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL); + return (0); + } + + dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH); + if (dbmask == NULL) + { + RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE); + return (0); + } + + to[0] = 0; + seed = to + 1; + db = to + SHA_DIGEST_LENGTH + 1; + + EVP_Digest((void *)param, plen, db, NULL, EVP_sha1()); + 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, + memcpy(seed, "\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f", 20); #endif - MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH); - for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++) - db[i] ^= dbmask[i]; - - MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH); - for (i = 0; i < SHA_DIGEST_LENGTH; i++) - seed[i] ^= seedmask[i]; + MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH); + for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++) + db[i] ^= dbmask[i]; + + MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH); + for (i = 0; i < SHA_DIGEST_LENGTH; i++) + seed[i] ^= seedmask[i]; - OPENSSL_free(dbmask); - return (1); - } + 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]; - - if (--num < 2 * SHA_DIGEST_LENGTH + 1) - goto decoding_err; - - lzero = num - flen; - if (lzero < 0) - goto decoding_err; - maskeddb = from - lzero + SHA_DIGEST_LENGTH; - - dblen = num - SHA_DIGEST_LENGTH; - db = OPENSSL_malloc(dblen); - if (db == NULL) { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE); - return (-1); - } + int i, dblen, mlen = -1; + const unsigned char *maskeddb; + int lzero; + unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH]; + + if (--num < 2 * SHA_DIGEST_LENGTH + 1) + goto decoding_err; + + lzero = num - flen; + if (lzero < 0) + goto decoding_err; + maskeddb = from - lzero + SHA_DIGEST_LENGTH; + + dblen = num - SHA_DIGEST_LENGTH; + db = OPENSSL_malloc(dblen); + if (db == NULL) + { + RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE); + return (-1); + } - MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen); - for (i = lzero; i < SHA_DIGEST_LENGTH; i++) - seed[i] ^= from[i - lzero]; + MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen); + for (i = lzero; i < SHA_DIGEST_LENGTH; i++) + seed[i] ^= from[i - lzero]; - MGF1(db, dblen, seed, SHA_DIGEST_LENGTH); - for (i = 0; i < dblen; i++) - db[i] ^= maskeddb[i]; - - EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1()); - - if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0) - goto decoding_err; - else - { - for (i = SHA_DIGEST_LENGTH; i < dblen; i++) - if (db[i] != 0x00) - break; - if (db[i] != 0x01 || i++ >= dblen) - goto decoding_err; + MGF1(db, dblen, seed, SHA_DIGEST_LENGTH); + for (i = 0; i < dblen; i++) + db[i] ^= maskeddb[i]; + + EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1()); + + if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0) + goto decoding_err; else - { - mlen = dblen - i; - if (tlen < mlen) { - RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE); - mlen = -1; + for (i = SHA_DIGEST_LENGTH; i < dblen; i++) + if (db[i] != 0x00) + break; + if (db[i] != 0x01 || i++ >= dblen) + goto decoding_err; + else + { + 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); + } } - else - memcpy(to, db + i, mlen); - } - } - OPENSSL_free(db); - return (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; - } + /* 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 MGF1(unsigned char *mask, long len, const unsigned char *seed, long seedlen) - { - long i, outlen = 0; - unsigned char cnt[4]; - EVP_MD_CTX c; - unsigned char md[SHA_DIGEST_LENGTH]; - - EVP_MD_CTX_init(&c); - 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); - EVP_DigestInit(&c,EVP_sha1()); - EVP_DigestUpdate(&c, seed, seedlen); - EVP_DigestUpdate(&c, cnt, 4); - if (outlen + SHA_DIGEST_LENGTH <= len) - { - EVP_DigestFinal(&c, mask + outlen, NULL); - outlen += SHA_DIGEST_LENGTH; - } - else - { - EVP_DigestFinal(&c, md, NULL); - memcpy(mask + outlen, md, len - outlen); - outlen = len; - } + long i, outlen = 0; + unsigned char cnt[4]; + EVP_MD_CTX c; + unsigned char md[SHA_DIGEST_LENGTH]; + + EVP_MD_CTX_init(&c); + 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); + EVP_DigestInit(&c,EVP_sha1()); + EVP_DigestUpdate(&c, seed, seedlen); + EVP_DigestUpdate(&c, cnt, 4); + if (outlen + SHA_DIGEST_LENGTH <= len) + { + EVP_DigestFinal(&c, mask + outlen, NULL); + outlen += SHA_DIGEST_LENGTH; + } + else + { + EVP_DigestFinal(&c, md, NULL); + memcpy(mask + outlen, md, len - outlen); + outlen = len; + } + } + EVP_MD_CTX_cleanup(&c); + return 0; } - EVP_MD_CTX_cleanup(&c); - return (0); - } #endif -- 2.25.1