| /*********************************************************************** | |
| * Copyright (c) 2014, 2015 Pieter Wuille * | |
| * Distributed under the MIT software license, see the accompanying * | |
| * file COPYING or https://www.opensource.org/licenses/mit-license.php.* | |
| ***********************************************************************/ | |
| | |
| #include <string.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; | |
| } | |
| if (privkey[1]) 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; | |
| } | |