and verification using PKCS #1 v1.5 signatures. import ( "bytes" "crypto/internal/fips140" "errors" ) // These are ASN1 DER structures: // // DigestInfo ::= SEQUENCE { // digestAlgorithm AlgorithmIdentifier, // digest OCTET STRING // } // // For performance, we don't use the generic ASN1 encoder. Rather, we // precompute a prefix of the digest value that makes a valid ASN1 DER string // with the correct contents. var hashPrefixes = map[string][]byte{ "MD5": {0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a,...