git / moonbite-core / src/secp256k1-zkp/contrib/lax_der_privatekey_parsing.c · raw

/********************************************************************** * Copyright (c) 2014, 2015 Pieter Wuille                             * * Distributed under the MIT software license, see the accompanying   * * file COPYING or http://www.opensource.org/licenses/mit-license.php.* **********************************************************************/#include <string.h>#include <secp256k1.h>#include "lax_der_privatekey_parsing.h"int ec_privkey_import_der(const secp256k1_context* ctx, unsigned char *out32, const unsigned char *privkey, size_t privkeylen) {    const unsigned char *end = privkey + privkeylen;    int lenb = 0;    int len = 0;    memset(out32, 0, 32);    /* sequence header */    if (end < privkey+1 || *privkey != 0x30) {        return 0;    }    privkey++;    /* sequence length constructor */    if (end < privkey+1 || !(*privkey & 0x80)) {        return 0;    }    lenb = *privkey & ~0x80; privkey++;    if (lenb < 1 || lenb > 2) {        return 0;    }    if (end < privkey+lenb) {        return 0;    }    /* sequence length */    len = privkey[lenb-1] | (lenb > 1 ? privkey[lenb-2] << 8 : 0);    privkey += lenb;    if (end < privkey+len) {        return 0;    }    /* sequence element 0: version number (=1) */    if (end < privkey+3 || privkey[0] != 0x02 || privkey[1] != 0x01 || privkey[2] != 0x01) {        return 0;    }    privkey += 3;    /* sequence element 1: octet string, up to 32 bytes */    if (end < privkey+2 || privkey[0] != 0x04 || privkey[1] > 0x20 || end < privkey+2+privkey[1]) {        return 0;    }    memcpy(out32 + 32 - privkey[1], privkey + 2, privkey[1]);    if (!secp256k1_ec_seckey_verify(ctx, out32)) {        memset(out32, 0, 32);        return 0;    }    return 1;}int ec_privkey_export_der(const secp256k1_context *ctx, unsigned char *privkey, size_t *privkeylen, const unsigned char *key32, int compressed) {    secp256k1_pubkey pubkey;    size_t pubkeylen = 0;    if (!secp256k1_ec_pubkey_create(ctx, &pubkey, key32)) {        *privkeylen = 0;        return 0;    }    if (compressed) {        static const unsigned char begin[] = {            0x30,0x81,0xD3,0x02,0x01,0x01,0x04,0x20        };        static const unsigned char middle[] = {            0xA0,0x81,0x85,0x30,0x81,0x82,0x02,0x01,0x01,0x30,0x2C,0x06,0x07,0x2A,0x86,0x48,            0xCE,0x3D,0x01,0x01,0x02,0x21,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,            0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,            0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x2F,0x30,0x06,0x04,0x01,0x00,0x04,0x01,0x07,0x04,            0x21,0x02,0x79,0xBE,0x66,0x7E,0xF9,0xDC,0xBB,0xAC,0x55,0xA0,0x62,0x95,0xCE,0x87,            0x0B,0x07,0x02,0x9B,0xFC,0xDB,0x2D,0xCE,0x28,0xD9,0x59,0xF2,0x81,0x5B,0x16,0xF8,            0x17,0x98,0x02,0x21,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,            0xFF,0xFF,0xFF,0xFF,0xFE,0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,0xBF,0xD2,0x5E,            0x8C,0xD0,0x36,0x41,0x41,0x02,0x01,0x01,0xA1,0x24,0x03,0x22,0x00        };        unsigned char *ptr = privkey;        memcpy(ptr, begin, sizeof(begin)); ptr += sizeof(begin);        memcpy(ptr, key32, 32); ptr += 32;        memcpy(ptr, middle, sizeof(middle)); ptr += sizeof(middle);        pubkeylen = 33;        secp256k1_ec_pubkey_serialize(ctx, ptr, &pubkeylen, &pubkey, SECP256K1_EC_COMPRESSED);        ptr += pubkeylen;        *privkeylen = ptr - privkey;    } else {        static const unsigned char begin[] = {            0x30,0x82,0x01,0x13,0x02,0x01,0x01,0x04,0x20        };        static const unsigned char middle[] = {            0xA0,0x81,0xA5,0x30,0x81,0xA2,0x02,0x01,0x01,0x30,0x2C,0x06,0x07,0x2A,0x86,0x48,            0xCE,0x3D,0x01,0x01,0x02,0x21,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,            0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,            0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x2F,0x30,0x06,0x04,0x01,0x00,0x04,0x01,0x07,0x04,            0x41,0x04,0x79,0xBE,0x66,0x7E,0xF9,0xDC,0xBB,0xAC,0x55,0xA0,0x62,0x95,0xCE,0x87,            0x0B,0x07,0x02,0x9B,0xFC,0xDB,0x2D,0xCE,0x28,0xD9,0x59,0xF2,0x81,0x5B,0x16,0xF8,            0x17,0x98,0x48,0x3A,0xDA,0x77,0x26,0xA3,0xC4,0x65,0x5D,0xA4,0xFB,0xFC,0x0E,0x11,            0x08,0xA8,0xFD,0x17,0xB4,0x48,0xA6,0x85,0x54,0x19,0x9C,0x47,0xD0,0x8F,0xFB,0x10,            0xD4,0xB8,0x02,0x21,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,            0xFF,0xFF,0xFF,0xFF,0xFE,0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,0xBF,0xD2,0x5E,            0x8C,0xD0,0x36,0x41,0x41,0x02,0x01,0x01,0xA1,0x44,0x03,0x42,0x00        };        unsigned char *ptr = privkey;        memcpy(ptr, begin, sizeof(begin)); ptr += sizeof(begin);        memcpy(ptr, key32, 32); ptr += 32;        memcpy(ptr, middle, sizeof(middle)); ptr += sizeof(middle);        pubkeylen = 65;        secp256k1_ec_pubkey_serialize(ctx, ptr, &pubkeylen, &pubkey, SECP256K1_EC_UNCOMPRESSED);        ptr += pubkeylen;        *privkeylen = ptr - privkey;    }    return 1;}