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fix formatting so that the file can be view with any tab-width
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Bodo Möller
parent
3cad81f6fe
commit
e1a4814cd4
@ -34,158 +34,158 @@ int MGF1(unsigned char *mask, long len,
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int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
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const unsigned char *from, int flen,
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const unsigned char *param, int plen)
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{
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int i, emlen = tlen - 1;
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unsigned char *db, *seed;
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unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
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if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
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RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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return (0);
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}
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int i, emlen = tlen - 1;
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unsigned char *db, *seed;
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unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
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if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL);
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return (0);
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}
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dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH);
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if (dbmask == NULL)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
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return (0);
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}
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if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
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RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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return (0);
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}
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to[0] = 0;
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seed = to + 1;
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db = to + SHA_DIGEST_LENGTH + 1;
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if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL);
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return (0);
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}
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dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH);
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if (dbmask == NULL)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
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return (0);
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}
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EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
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memset(db + SHA_DIGEST_LENGTH, 0,
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emlen - flen - 2 * SHA_DIGEST_LENGTH - 1);
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db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
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memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen);
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if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0)
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return (0);
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to[0] = 0;
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seed = to + 1;
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db = to + SHA_DIGEST_LENGTH + 1;
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EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
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memset(db + SHA_DIGEST_LENGTH, 0,
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emlen - flen - 2 * SHA_DIGEST_LENGTH - 1);
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db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
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memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen);
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if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0)
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return (0);
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#ifdef PKCS_TESTVECT
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memcpy(seed,
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memcpy(seed,
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"\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f",
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20);
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#endif
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MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
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for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
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db[i] ^= dbmask[i];
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MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
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for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
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db[i] ^= dbmask[i];
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MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH);
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for (i = 0; i < SHA_DIGEST_LENGTH; i++)
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seed[i] ^= seedmask[i];
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MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH);
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for (i = 0; i < SHA_DIGEST_LENGTH; i++)
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seed[i] ^= seedmask[i];
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OPENSSL_free(dbmask);
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return (1);
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}
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OPENSSL_free(dbmask);
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return 1;
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}
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int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
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const unsigned char *from, int flen, int num,
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const unsigned char *param, int plen)
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{
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int i, dblen, mlen = -1;
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const unsigned char *maskeddb;
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int lzero;
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unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
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if (--num < 2 * SHA_DIGEST_LENGTH + 1)
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goto decoding_err;
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lzero = num - flen;
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if (lzero < 0)
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goto decoding_err;
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maskeddb = from - lzero + SHA_DIGEST_LENGTH;
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dblen = num - SHA_DIGEST_LENGTH;
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db = OPENSSL_malloc(dblen);
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if (db == NULL)
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{
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
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return (-1);
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}
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int i, dblen, mlen = -1;
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const unsigned char *maskeddb;
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int lzero;
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unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
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MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
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for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
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seed[i] ^= from[i - lzero];
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MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
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for (i = 0; i < dblen; i++)
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db[i] ^= maskeddb[i];
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if (--num < 2 * SHA_DIGEST_LENGTH + 1)
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goto decoding_err;
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EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1());
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if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
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goto decoding_err;
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else
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{
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for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
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if (db[i] != 0x00)
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break;
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if (db[i] != 0x01 || i++ >= dblen)
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goto decoding_err;
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else
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{
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mlen = dblen - i;
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if (tlen < mlen)
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lzero = num - flen;
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if (lzero < 0)
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goto decoding_err;
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maskeddb = from - lzero + SHA_DIGEST_LENGTH;
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dblen = num - SHA_DIGEST_LENGTH;
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db = OPENSSL_malloc(dblen);
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if (db == NULL)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
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mlen = -1;
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RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
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return (-1);
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}
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else
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memcpy(to, db + i, mlen);
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}
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}
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OPENSSL_free(db);
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return (mlen);
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MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
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for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
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seed[i] ^= from[i - lzero];
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MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
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for (i = 0; i < dblen; i++)
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db[i] ^= maskeddb[i];
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EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1());
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if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
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goto decoding_err;
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else
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{
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for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
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if (db[i] != 0x00)
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break;
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if (db[i] != 0x01 || i++ >= dblen)
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goto decoding_err;
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else
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{
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mlen = dblen - i;
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if (tlen < mlen)
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{
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
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mlen = -1;
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}
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else
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memcpy(to, db + i, mlen);
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}
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}
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OPENSSL_free(db);
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return mlen;
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decoding_err:
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/* to avoid chosen ciphertext attacks, the error message should not reveal
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* which kind of decoding error happened */
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
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if (db != NULL) OPENSSL_free(db);
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return -1;
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}
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/* to avoid chosen ciphertext attacks, the error message should not reveal
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* which kind of decoding error happened */
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RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
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if (db != NULL) OPENSSL_free(db);
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return -1;
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}
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int MGF1(unsigned char *mask, long len,
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const unsigned char *seed, long seedlen)
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{
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long i, outlen = 0;
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unsigned char cnt[4];
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EVP_MD_CTX c;
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unsigned char md[SHA_DIGEST_LENGTH];
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EVP_MD_CTX_init(&c);
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for (i = 0; outlen < len; i++)
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{
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cnt[0] = (unsigned char)((i >> 24) & 255);
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cnt[1] = (unsigned char)((i >> 16) & 255);
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cnt[2] = (unsigned char)((i >> 8)) & 255;
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cnt[3] = (unsigned char)(i & 255);
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EVP_DigestInit(&c,EVP_sha1());
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EVP_DigestUpdate(&c, seed, seedlen);
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EVP_DigestUpdate(&c, cnt, 4);
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if (outlen + SHA_DIGEST_LENGTH <= len)
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{
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EVP_DigestFinal(&c, mask + outlen, NULL);
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outlen += SHA_DIGEST_LENGTH;
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}
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else
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{
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EVP_DigestFinal(&c, md, NULL);
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memcpy(mask + outlen, md, len - outlen);
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outlen = len;
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}
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long i, outlen = 0;
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unsigned char cnt[4];
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EVP_MD_CTX c;
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unsigned char md[SHA_DIGEST_LENGTH];
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EVP_MD_CTX_init(&c);
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for (i = 0; outlen < len; i++)
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{
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cnt[0] = (unsigned char)((i >> 24) & 255);
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cnt[1] = (unsigned char)((i >> 16) & 255);
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cnt[2] = (unsigned char)((i >> 8)) & 255;
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cnt[3] = (unsigned char)(i & 255);
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EVP_DigestInit(&c,EVP_sha1());
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EVP_DigestUpdate(&c, seed, seedlen);
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EVP_DigestUpdate(&c, cnt, 4);
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if (outlen + SHA_DIGEST_LENGTH <= len)
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{
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EVP_DigestFinal(&c, mask + outlen, NULL);
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outlen += SHA_DIGEST_LENGTH;
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}
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else
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{
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EVP_DigestFinal(&c, md, NULL);
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memcpy(mask + outlen, md, len - outlen);
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outlen = len;
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}
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}
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EVP_MD_CTX_cleanup(&c);
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return 0;
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}
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EVP_MD_CTX_cleanup(&c);
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return (0);
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}
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#endif
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